Impl "Action" object for undo/redo history

TODO: Store undo/redo history for color editing, allow deleting
individual triangles and undo/redo of them.

.forgejo/workflows/unittests.yml

@@ -0,0 +1,15 @@
+name: Run UnitTests
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  build-and-run-tests:
+    runs-on: any_archLinux
+    steps:
+      - run: git clone --depth=1 --no-single-branch https://git.seodisparate.com/stephenseo/Triangles.git Tri
+      - run: cd Tri && git checkout $GITHUB_REF_NAME
+      - run: cd Tri && git submodule update --init --recursive
+      - run: cd Tri && cmake -S . -B buildDebug -DCMAKE_BUILD_TYPE=Debug
+      - run: make -C Tri/buildDebug UnitTest_Triangles && ./Tri/buildDebug/UnitTest_Triangles

.github/workflows/unittests.yml

@@ -0,0 +1,24 @@
+name: Run UnitTests
+on:
+  push:
+    branches:
+      - '*'
+
+jobs:
+  build-and-run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install dependencies
+        run: sudo /usr/bin/env DEBIAN_FRONTEND=noninteractive apt-get install cmake git patch libasound2-dev libx11-dev libxrandr-dev libxi-dev libgl1-mesa-dev libglu1-mesa-dev libxcursor-dev libxinerama-dev
+      - name: Fetch Raylib sources
+        run: git clone https://github.com/raysan5/raylib raylib && cd raylib && git checkout 5.0
+      - name: Patch Raylib version (version 5.0 in cmake)
+        run: cd raylib && git show 032cc497ca5aaca862dc926a93c2a45ed8017737 | patch -p1
+      - name: Build Raylib
+        run: cd raylib && cmake -B buildRelease -S . -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=On -DCMAKE_INSTALL_PREFIX=/usr/local && make -C buildRelease
+      - name: Install Raylib
+        run: cd raylib/buildRelease && sudo make install
+      - name: Fetch Triangles
+        run: git clone --depth=1 --no-single-branch https://github.com/Stephen-Seo/Triangles Tri && cd Tri && git checkout $GITHUB_REF_NAME && git submodule update --init --recursive
+      - name: Build and Run UnitTests
+        run: cd Tri && cmake -B buildDebug -S . -DCMAKE_BUILD_TYPE=Debug && make -C buildDebug UnitTest_Triangles && ./buildDebug/UnitTest_Triangles

.gitignore

@@ -1,3 +1,4 @@
 build*/
 compile_commands.json
 .clangd/
+.cache/

.gitmodules

@@ -1,6 +1,6 @@
-[submodule "third_party/imgui"]
-	path = third_party/imgui
-	url = https://github.com/ocornut/imgui.git
-[submodule "third_party/imgui-sfml"]
-	path = third_party/imgui-sfml
-	url = https://github.com/eliasdaler/imgui-sfml.git
+[submodule "third_party/raygui"]
+	path = third_party/raygui
+	url = https://github.com/raysan5/raygui.git
+[submodule "third_party/glm"]
+	path = third_party/glm
+	url = https://github.com/g-truc/glm.git

CMakeLists.txt

@@ -1,14 +1,14 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.8.2)
 project(Triangles LANGUAGES CXX VERSION 1.0)
 
-if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/imgui/imgui.h)
-    message(FATAL_ERROR "third_party/imgui/imgui.h is missing!\n \
-Please update the GameDevTools submodule by running 'git submodule init' and \
+if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/glm/glm/glm.hpp)
+    message(FATAL_ERROR "third_party/glm/glm/glm.hpp is missing!\n \
+Please update the glm submodule by running 'git submodule init' and \
 'git submodule update'!")
 endif()
-if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/imgui-sfml/imgui-SFML.h)
-    message(FATAL_ERROR "third_party/imgui-sfml/imgui-SFML.h is missing!\n \
-Please update the GameDevTools submodule by running 'git submodule init' and \
+if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/third_party/raygui/src/raygui.h)
+    message(FATAL_ERROR "third_party/raygui/src/raygui.h is missing!\n \
+Please update the raygui submodule by running 'git submodule init' and \
 'git submodule update'!")
 endif()
 
@@ -16,34 +16,18 @@ if(NOT DEFINED CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "Debug")
 endif()
 
-if(CMAKE_BUILD_TYPE MATCHES "Debug")
-    set(ImGuiDemo "third_party/imgui/imgui_demo.cpp")
-else()
-    set(ImGuiDemo "")
-endif()
-
 set(Triangles_MAIN_SOURCES
     src/main.cpp
 )
 
 set(Triangles_LIB_SOURCES
     src/state.cpp
-    third_party/imgui/imgui.cpp
-    third_party/imgui/imgui_draw.cpp
-    third_party/imgui/imgui_widgets.cpp
-    third_party/imgui-sfml/imgui-SFML.cpp
+    src/shape.cpp
+    src/triangle.cpp
+    src/circle.cpp
+    src/raygui.cpp
 )
 
-if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-	set(CMAKE_CXX_FLAGS_DEBUG "/Od /Zi")
-	set(CMAKE_CXX_FLAGS_RELEASE "/O2 /DNDEBUG")
-else()
-    set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wpedantic -Wsuggest-override")
-    set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g")
-    set(CMAKE_CXX_FLAGS_RELEASE "-O3 -D NDEBUG")
-endif()
-
 add_library(TrianglesLib STATIC ${Triangles_LIB_SOURCES})
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
@@ -52,54 +36,51 @@ else()
     add_executable(Triangles ${Triangles_MAIN_SOURCES})
 endif()
 
+target_compile_options(TrianglesLib PRIVATE
+    -Wall -Wextra -Wpedantic
+    -Wsuggest-override
+    $<$<COMPILE_LANGUAGE:CXX>:-Weffc++>
+    $<$<CONFIG:DEBUG>:-Og>
+)
+target_compile_options(Triangles PRIVATE
+    -Wall -Wextra -Wpedantic
+    -Wsuggest-override
+    $<$<COMPILE_LANGUAGE:CXX>:-Weffc++>
+    $<$<CONFIG:DEBUG>:-Og>
+)
+
 target_link_libraries(Triangles PUBLIC TrianglesLib)
 
 target_compile_features(TrianglesLib PUBLIC cxx_std_17)
 
 if(BUILD_SHARED_LIBS OR (UNIX AND NOT CYGWIN) OR (CMAKE_CXX_COMPILER_ID MATCHES "MSVC"))
-    find_package(SFML 2 REQUIRED
-        COMPONENTS audio network graphics window system)
+    find_package(raylib 5.0 REQUIRED)
 else()
-    find_package(SFML 2 REQUIRED
-        COMPONENTS audio-s network-s graphics-s window-s system-s)
-    add_definitions(-DSFML_STATIC)
+    find_package(raylib 5.0 REQUIRED)
 endif()
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
 target_link_libraries(TrianglesLib PUBLIC
-    sfml-graphics sfml-window sfml-system
+    raylib
     opengl32
 )
 else()
 target_link_libraries(TrianglesLib PUBLIC
-    sfml-graphics sfml-window sfml-system
+    raylib
     GL
 )
 endif()
 
-if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-    target_include_directories(TrianglesLib PUBLIC
-        ${CMAKE_CURRENT_SOURCE_DIR}/src
-        ${SFML_INCLUDE_DIR}
-        ${CMAKE_CURRENT_SOURCE_DIR}/third_party/imgui # imgui related headers
-        ${CMAKE_CURRENT_SOURCE_DIR}/third_party/imgui-sfml # imgui-sfml related headers
-    )
-else()
-    target_include_directories(TrianglesLib PUBLIC
-        ${CMAKE_CURRENT_SOURCE_DIR}/src
-        ${SFML_INCLUDE_DIR}
-        ${CMAKE_CURRENT_SOURCE_DIR}/build_include # imgui related headers
-    )
-endif()
-
-# Use macro to override imgui config header
-target_compile_definitions(TrianglesLib PUBLIC
-    "IMGUI_USER_CONFIG=\"${CMAKE_CURRENT_SOURCE_DIR}/third_party/imgui-sfml/imconfig-SFML.h\"")
+target_include_directories(TrianglesLib PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/src
+    ${CMAKE_CURRENT_SOURCE_DIR}/third_party/raygui/src
+    ${CMAKE_CURRENT_SOURCE_DIR}/third_party/glm
+)
 
 if(CMAKE_BUILD_TYPE MATCHES "Debug")
     set(Triangles_UNIT_TEST_SOURCES
-        src/unittest/test_main.cpp
         src/unittest/test_helpers.cpp
+        third_party/catch/catch_amalgamated.cpp
     )
 
     add_executable(UnitTest_Triangles ${Triangles_UNIT_TEST_SOURCES})

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 Stephen Seo
+Copyright (c) 2020-2021,2023-2024 Stephen Seo
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -5,7 +5,7 @@ THIS PROJECT IS STILL A WORK IN PROGRESS!
 A gui application that lets you draw triangles of different colors on a colored
 background.
 
-Uses [imgui](https://github.com/ocornut/imgui) for UI.
+Uses [raygui](https://github.com/raysan5/raygui) for UI.
 
 # Compiling
 
@@ -18,19 +18,19 @@ Create a build dir, run cmake, and then make to build.
 
 ## Dependencies
 
-SFML should be installed on the system. imgui, and imgui-sfml are git submodules
-and should be initialized with `git submodule update --init --recursive`.
+Raylib should be installed on the system. Other third-party dependencies are git
+submodules and should be initialized with `git submodule update --init recursive`.
 
 # Legal stuff
 
-Uses [SFML](https://github.com/SFML/SFML), which is licensed under the
-[SFML license](https://github.com/SFML/SFML/blob/master/license.md).
+Uses [raylib](https://github.com/raysan5/raylib), which is licensed under the
+[zlib license](https://choosealicense.com/licenses/zlib).
 
-Uses [imgui](https://github.com/ocornut/imgui), which is licensed under the
-[MIT](https://choosealicense.com/licenses/mit/) license.
+Uses [raygui](https://github.com/raysan5/raylib), which is licensed under the
+[zlib license](https://choosealicense.com/licenses/zlib).
 
-Uses [imgui-sfml](https://github.com/eliasdaler/imgui-sfml), which is licensed
-under the [MIT](https://choosealicense.com/licenses/mit/) license.
+Uses [glm](https://github.com/g-truc/glm), which is licensed under the [Happy
+Bunny License or the MIT License](https://github.com/g-truc/glm/blob/master/copying.txt).
 
 Uses [catch](https://github.com/catchorg/Catch2), which is licensed under the
 [Boost Software](https://choosealicense.com/licenses/bsl-1.0/) license.

build_include/imconfig.h

@@ -1 +0,0 @@
-../third_party/imgui-sfml/imconfig-SFML.h

build_include/imgui-SFML.h

@@ -1 +0,0 @@
-../third_party/imgui-sfml/imgui-SFML.h

build_include/imgui-SFML_export.h

@@ -1 +0,0 @@
-../third_party/imgui-sfml/imgui-SFML_export.h

build_include/imgui.h

@@ -1 +0,0 @@
-../third_party/imgui/imgui.h

build_include/imgui_internal.h

@@ -1 +0,0 @@
-../third_party/imgui/imgui_internal.h

build_include/imstb_rectpack.h

@@ -1 +0,0 @@
-../third_party/imgui/imstb_rectpack.h

build_include/imstb_textedit.h

@@ -1 +0,0 @@
-../third_party/imgui/imstb_textedit.h

build_include/imstb_truetype.h

@@ -1 +0,0 @@
-../third_party/imgui/imstb_truetype.h

src/circle.cpp

@@ -0,0 +1,60 @@
+#include "circle.hpp"
+
+#include <cmath>
+
+Tri::Circle::Circle() :
+Shape(),
+position{0.0f, 0.0f},
+radius(4.0f)
+{}
+
+Tri::Circle::Circle(glm::vec2 pos) :
+Shape(),
+position(pos),
+radius(4.0f)
+{}
+
+Tri::Circle::Circle(glm::vec2 pos, float radius) :
+Shape(),
+position(pos),
+radius(radius)
+{}
+
+Tri::Circle::Circle(glm::vec2 pos, float radius, Color fillColor) :
+Shape(fillColor),
+position(pos),
+radius(radius)
+{}
+
+Tri::Circle::Circle(glm::vec2 pos, float radius, Color fillColor, Color outlineColor) :
+Shape(fillColor, outlineColor),
+position(pos),
+radius(radius)
+{}
+
+Tri::Shape& Tri::Circle::draw() {
+    glm::vec2 transformed = transform * glm::vec3(position.x, position.y, 1.0f);
+    transformed.x = std::roundf(transformed.x);
+    transformed.y = std::roundf(transformed.y);
+    DrawCircle(transformed.x, transformed.y, radius, fillColor);
+    DrawCircleLines(transformed.x, transformed.y, radius, outlineColor);
+    return *this;
+}
+
+void Tri::Circle::getVertices(std::vector<glm::vec2> &verticesOut) const {
+    verticesOut.clear();
+    verticesOut.push_back(position);
+}
+
+void Tri::Circle::getTransformedVertices(std::vector<glm::vec2> &verticesOut) const {
+    verticesOut.clear();
+    verticesOut.push_back(transform * glm::vec3{position.x, position.y, 1.0f});
+}
+
+float Tri::Circle::getRadius() const {
+    return radius;
+}
+
+void Tri::Circle::setRadius(float radius) {
+    this->radius = radius;
+}

src/circle.hpp

@@ -0,0 +1,29 @@
+#ifndef TRIANGLES_CIRCLE_HPP
+#define TRIANGLES_CIRCLE_HPP
+
+#include "shape.hpp"
+
+namespace Tri {
+
+struct Circle : public Shape {
+    Circle();
+    Circle(glm::vec2 pos);
+    Circle(glm::vec2 pos, float radius);
+    Circle(glm::vec2 pos, float radius, Color fillColor);
+    Circle(glm::vec2 pos, float radius, Color fillColor, Color outlineColor);
+
+    glm::vec2 position;
+    float radius;
+
+    virtual Shape& draw() override;
+
+    virtual void getVertices(std::vector<glm::vec2> &verticesOut) const override;
+    virtual void getTransformedVertices(std::vector<glm::vec2> &verticesOut) const override;
+
+    virtual float getRadius() const override;
+    virtual void setRadius(float radius) override;
+}; // struct Circle
+
+} // namespace Tri
+
+#endif

src/helpers.hpp

@@ -3,14 +3,24 @@
 
 #include <cmath>
 #include <optional>
+#include <cassert>
 
-#include <imgui.h>
+#include <raylib.h>
+#include <raygui.h>
 
+#include "shape.hpp"
 #include "state.hpp"
 
 #define SHOW_HELP_WIDTH (state->get_width() / 2.0f)
 #define SHOW_HELP_HEIGHT (state->get_height() / 2.0f)
 
+#define DEFAULT_WIDTH 800
+#define DEFAULT_HEIGHT 600
+#define CHANGE_SIZE_MIN_X 800
+#define CHANGE_SIZE_MAX_X 1920
+#define CHANGE_SIZE_MIN_Y 600
+#define CHANGE_SIZE_MAX_Y 1080
+
 #ifndef NDEBUG
 # include <cstdio>
 #endif
@@ -20,163 +30,265 @@ namespace Tri {
     // so this should be called during update, not draw
     inline void draw_help(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_DISPLAY_HELP)) {
-            ImGui::SetNextWindowPos(sf::Vector2f(10.0f, 10.0f));
-            ImGui::SetNextWindowSize(sf::Vector2f(
-                state->get_width() - 20.0f,
-                state->get_height() - 20.0f));
-            ImGui::SetNextWindowBgAlpha(0.7f);
-            ImGui::Begin("Help Window", nullptr, ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoSavedSettings);
-            ImGui::Text("This is the help window - Press \"H\" to toggle this window");
-            ImGui::Text("Click anywhere to create triangles, one point at a time");
-            ImGui::Text("You cannot draw when a window is open");
-            ImGui::Text("Press \"U\" to undo. Clicking will remove all future undo history");
-            ImGui::Text("Press \"R\" to redo.");
-            ImGui::Text("Press \"C\" to change colors");
-            ImGui::Text("Press \"B\" to change background color");
-            ImGui::Text("Press \"P\" to set current color to a color on screen");
-            ImGui::Text("Press \"S\" to save what was drawn as a png image");
-            if(ImGui::Button("Close")) {
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({10.0f,
+                             10.0f,
+                             800.0f - 20.0f,
+                             600.0f - 20.0f},
+                             "Help")) {
+                GuiLabel(
+                    {14.0f, 38.0f, 800.0f - 28.0f, 16.0f},
+                    "This is the help window - Press \"H\" to toggle this window");
+                GuiLabel(
+                    {14.0f, 56.0f, 800.0f - 28.0f, 16.0f},
+                    "Click anywhere to create triangles, one point at a time");
+                GuiLabel(
+                    {14.0f, 74.0f, 800.0f - 28.0f, 16.0f},
+                    "You cannot draw when a window is open");
+                GuiLabel(
+                    {14.0f, 92.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"U\" to undo. Clicking will remove all future undo history");
+                GuiLabel(
+                    {14.0f, 110.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"R\" to redo.");
+                GuiLabel(
+                    {14.0f, 128.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"C\" to change colors");
+                GuiLabel(
+                    {14.0f, 146.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"B\" to change background color");
+                GuiLabel(
+                    {14.0f, 164.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"P\" to set current color to a color on screen");
+                GuiLabel(
+                    {14.0f, 182.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"S\" to save what was drawn as a png image");
+                GuiLabel(
+                    {14.0f, 200.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"I\" to resize the canvas");
+                GuiLabel(
+                    {14.0f, 218.0f, 800.0f - 28.0f, 16.0f},
+                    "Press \"E\" to edit the selected tri");
+                if(GuiButton({14.0f, 238.0f, 100.0f, 16.0f}, "Close")) {
+                    state->close_help();
+                }
+            } else {
                 state->close_help();
             }
-            ImGui::End();
         }
     }
 
     inline void draw_notification(Tri::State *state) {
         float alpha = state->get_notification_alpha();
         if(alpha > 0.0f) {
-            ImGui::PushStyleVar(ImGuiStyleVar_Alpha, alpha);
-
-            ImGui::SetNextWindowPos(sf::Vector2f(
-                (state->get_width() - SHOW_HELP_WIDTH) / 2.0f,
-                (state->get_height() - SHOW_HELP_HEIGHT) / 2.0f));
-            ImGui::SetNextWindowSize(sf::Vector2f(
-                SHOW_HELP_WIDTH,
-                SHOW_HELP_HEIGHT));
-            ImGui::Begin(
-                "Notification Window",
-                nullptr,
-                ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoSavedSettings);
-            ImGui::SetWindowFontScale(3.0f);
-            ImGui::Text("%s", state->get_notification_text());
-            ImGui::End();
-
-            ImGui::PopStyleVar();
+            GuiSetAlpha(alpha);
+            GuiPanel({(800 - SHOW_HELP_WIDTH) / 2.0f,
+                      (600 - SHOW_HELP_HEIGHT) / 2.0f,
+                      SHOW_HELP_WIDTH,
+                      SHOW_HELP_HEIGHT}, nullptr);
+            GuiLabel({4.0f + (800 - SHOW_HELP_WIDTH) / 2.0f,
+                      4.0f + (600 - SHOW_HELP_HEIGHT) / 2.0f,
+                      SHOW_HELP_WIDTH - 8.0f,
+                      SHOW_HELP_HEIGHT - 8.0f},
+                     state->get_notification_text());
         }
     }
 
     inline void draw_color_picker(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_DISPLAY_COLOR_P)) {
-            ImGui::Begin("Tri Color Picker");
-            ImGui::ColorPicker4("Tri Color", state->get_color());
-            if(ImGui::Button("Close")) {
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({4.0f, 4.0f, 242.0f, 328.0f}, "Tri Color Picker")) {
+                auto &color = state->get_color();
+                GuiColorPicker(
+                    {8.0f, 32.0f, 206.0f, 240.0f},
+                    nullptr,
+                    &color);
+                float alpha = ((float)color.a) / 255.0F;
+                GuiColorBarAlpha(
+                    {8.0F, 280.0F, 206.0F, 20.0F},
+                    nullptr,
+                    &alpha
+                );
+                color.a = alpha * 255.0F;
+                if(GuiButton({8.0f, 308.0f, 234.0f, 16.0f}, "Close")) {
+                    state->close_color_picker();
+                }
+            } else {
                 state->close_color_picker();
             }
-            ImGui::End();
         }
     }
 
     inline void draw_bg_color_picker(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_DISPLAY_BG_COLOR_P)) {
-            ImGui::Begin("BG Color Picker");
-            ImGui::ColorPicker3("BG Color", state->get_bg_color());
-            if(ImGui::Button("Close")) {
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({250.0f, 4.0f, 242.0f, 292.0f}, "BG Color Picker")) {
+                auto &colorArray = state->get_bg_color();
+                GuiColorPicker(
+                    {254.0f, 32.0f, 206.0f, 240.0f},
+                    nullptr,
+                    &colorArray);
+                if(GuiButton({254.0f, 274.0f, 234.0f, 16.0f}, "Close")) {
+                    state->close_bg_color_picker();
+                }
+            } else {
                 state->close_bg_color_picker();
             }
-            ImGui::End();
         }
     }
 
     inline void draw_save(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_DISPLAY_SAVE)) {
             auto *filenameBuffer = state->get_save_filename_buffer();
-            ImGui::Begin("Save");
-            ImGui::InputText("Filename", filenameBuffer->data(), filenameBuffer->size() - 1);
-            if(ImGui::Button("Save")) {
-                if(state->do_save()) {
-                    state->close_save();
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({4.0f, 300.0f, 292.0f, 292.0f}, "Save")) {
+                GuiTextBox(
+                    {8.0f, 328.0f, 284.0f, 20.0f},
+                    filenameBuffer->data(),
+                    filenameBuffer->size() - 1,
+                    true);
+                if(GuiButton({8.0f, 352.0f, 50.0f, 16.0f}, "Save")) {
+                    if(state->do_save()) {
+                        state->close_save();
+                    }
                 }
-            } else if(ImGui::Button("Cancel")) {
+                const std::string &string = state->failed_message();
+                if(!string.empty()) {
+                    GuiLabel({8.0f, 372.0f, 284.0f, 16.0f}, string.c_str());
+                }
+            } else {
                 state->close_save();
             }
-            auto string_view = state->failed_message();
-            if(!string_view.empty()) {
-                ImGui::TextUnformatted(string_view.data(), string_view.data() + string_view.size());
-            }
-            ImGui::End();
         }
     }
 
     inline void draw_change_size(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_DISPLAY_CHANGE_SIZE)) {
-            ImGui::Begin("ChangeSize");
-            ImGui::InputInt2("Width and Height", state->get_input_width_height());
-            auto string_view = state->failed_message();
-            if(!string_view.empty()) {
-                ImGui::TextUnformatted(string_view.data(), string_view.data() + string_view.size());
-            }
-            if(ImGui::Button("Cancel")) {
-                state->close_input_width_height_window();
-            }
-            if(ImGui::Button("Set")) {
-                if(state->change_width_height()) {
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({300.0f, 300.0f, 292.0f, 292.0f}, "Change Size")) {
+                GuiValueBox(
+                        {384.0f, 328.0f, 80.0f, 16.0f},
+                        "Width",
+                        state->get_input_width(),
+                        CHANGE_SIZE_MIN_X,
+                        CHANGE_SIZE_MAX_X,
+                        !state->get_flags().test(State::F_TAB_TOGGLE));
+                GuiValueBox(
+                        {384.0f, 348.0f, 80.0f, 16.0f},
+                        "Height",
+                        state->get_input_height(),
+                        CHANGE_SIZE_MIN_Y,
+                        CHANGE_SIZE_MAX_Y,
+                        state->get_flags().test(State::F_TAB_TOGGLE));
+                const std::string &failMessage = state->failed_message();
+                if(!failMessage.empty()) {
+                    GuiLabel({304.0f, 368.0f, 284.0f, 16.0f}, failMessage.c_str());
+                }
+                if(GuiButton({304.0f, 394.0f, 70.0f, 16.0f}, "Cancel")) {
                     state->close_input_width_height_window();
                 }
+                if(GuiButton({378.0f, 394.0f, 50.0f, 16.0f}, "Set")) {
+                    if(state->change_width_height()) {
+                        state->close_input_width_height_window();
+                    }
+                }
+            } else {
+                state->close_input_width_height_window();
             }
-            ImGui::End();
         }
     }
 
     inline bool is_within_shape(
-            const sf::ConvexShape &shape,
-            sf::Vector2f xy) {
-        std::optional<bool> is_right;
-        sf::Transform t = shape.getTransform();
-        for(unsigned int i = 0; i < shape.getPointCount(); ++i) {
-            sf::Vector2f t_a = t.transformPoint(shape.getPoint(i));
-            sf::Vector2f t_b = t.transformPoint(shape.getPoint((i + 1) % shape.getPointCount()));
+            const Tri::Shape &shape,
+            glm::vec2 xy) {
+        float radius = shape.getRadius();
+        std::vector<glm::vec2> vertices;
+        shape.getTransformedVertices(vertices);
+        if(radius > 0.0f) {
+            assert(vertices.size() == 1);
 
-            t_b = t_b - t_a;
-            t_a = xy - t_a;
+            xy = xy - vertices[0];
+            return std::sqrt(xy.x * xy.x + xy.y * xy.y) <= radius;
+        } else {
+            assert(vertices.size() > 2);
 
-            // TODO
-            // cross product, where z coordinate is 0
-            // Use sign of z value to determine if line is to right or left
-            //
-            // a   x b   = c
-            // a_1   b_1   0
-            // a_2   b_2   0
-            // 0     0     a_1 * b_2 - a_2 * b_1
-            //
-            // in this case "a" is "t_b"
-            float z = t_b.x * t_a.y - t_b.y * t_a.x;
-            if(is_right.has_value()) {
-                if(is_right.value()) {
-                    if(z >= 0.0f) {
+            std::optional<bool> is_right;
+            for(unsigned int i = 0; i < vertices.size(); ++i) {
+                glm::vec2 t_a, t_b;
+                t_b = vertices[(i + 1) % vertices.size()] - vertices[i];
+                t_a = xy - vertices[i];
+
+                // cross product, where z coordinate is 0
+                // Use sign of z value to determine if line is to right or left
+                //
+                // a   x b   = c
+                // a_1   b_1   0
+                // a_2   b_2   0
+                // 0     0     a_1 * b_2 - a_2 * b_1
+                //
+                // in this case "a" is "t_b"
+                float z = t_b.x * t_a.y - t_b.y * t_a.x;
+                if(is_right.has_value()) {
+                    if(is_right.value()) {
+                        if(z >= 0.0f) {
+                            return false;
+                        }
+                    } else if(z < 0.0f) {
                         return false;
                     }
-                } else if(z < 0.0f) {
-                    return false;
+                } else {
+                    is_right = z < 0.0f;
                 }
-            } else {
-                is_right = z < 0.0f;
             }
+            return true;
         }
-        return true;
     }
 
-    inline sf::Color invert_color(const sf::Color &other) {
-        return sf::Color(255 - other.r, 255 - other.g, 255 - other.b);
+    inline Color invert_color(const Color &other) {
+        return Color{
+            (unsigned char)(255 - (int)other.r),
+            (unsigned char)(255 - (int)other.g),
+            (unsigned char)(255 - (int)other.b),
+            other.a};
     }
 
     inline void draw_edit_tri(Tri::State *state) {
         if(state->get_flags().test(Tri::State::F_TRI_EDIT_MODE)) {
-            ImGui::Begin("Edit Tri Color Picker");
-            ImGui::ColorPicker4("Tri Color", state->get_selected_tri_color());
-            if(ImGui::Button("Close")) {
+            GuiSetAlpha(1.0f);
+            if(!GuiWindowBox({500.0f, 4.0f, 242.0f, 328.0f}, "Edit Tri Color Picker")) {
+                auto &color = state->get_selected_tri_color();
+                GuiColorPicker(
+                    {504.0f, 32.0f, 206.0f, 240.0f},
+                    nullptr,
+                    &color);
+                float alpha = ((float)color.a) / 255.0F;
+                GuiColorBarAlpha(
+                    {504.0F, 280.0F, 206.0F, 20.0F},
+                    nullptr,
+                    &alpha
+                );
+                color.a = alpha * 255.0F;
+                if(GuiButton({504.0f, 308.0f, 234.0f, 16.0f}, "Close")) {
+                    state->close_selected_tri_mode();
+                }
+            } else {
                 state->close_selected_tri_mode();
             }
-            ImGui::End();
+        }
+    }
+
+    inline void make_counter_clockwise(std::array<glm::vec2, 3> &tri) {
+        // 2D cross product to get the sign to determine if clockwise
+        glm::vec2 t_a, t_b;
+        t_b = tri[1] - tri[0];
+        t_a = tri[2] - tri[0];
+
+        float z = t_b.x * t_a.y - t_b.y * t_a.x;
+        if(z >= 0.0f) {
+            // is clockwise, swap first with last
+            t_a = tri[0];
+            tri[0] = tri[2];
+            tri[2] = t_a;
         }
     }
 }

src/main.cpp

@@ -1,10 +1,3 @@
-#include <SFML/System.hpp>
-#include <SFML/Window.hpp>
-#include <SFML/Graphics.hpp>
-
-#include <imgui.h>
-#include <imgui-SFML.h>
-
 #include "state.hpp"
 
 #ifdef _MSC_VER

src/raygui.cpp

@@ -0,0 +1,14 @@
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wall"
+#pragma GCC diagnostic ignored "-Wextra"
+#pragma GCC diagnostic ignored "-Wpedantic"
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#pragma GCC diagnostic ignored "-Wenum-compare"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Weffc++"
+
+#define RAYGUI_IMPLEMENTATION
+#include <raygui.h>
+
+#pragma GCC diagnostic pop

src/shape.cpp

@@ -0,0 +1,46 @@
+#include "shape.hpp"
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Weffc++"
+#include <glm/ext/matrix_transform.hpp>
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/gtx/matrix_transform_2d.hpp>
+#pragma GCC diagnostic pop
+
+Tri::Shape::Shape() :
+transform(glm::identity<glm::mat3>()),
+fillColor(RAYWHITE),
+outlineColor(BLACK)
+{}
+
+Tri::Shape::Shape(Color fillColor) :
+transform(glm::identity<glm::mat3>()),
+fillColor(fillColor),
+outlineColor(BLACK)
+{}
+
+Tri::Shape::Shape(Color fillColor, Color outlineColor) :
+transform(glm::identity<glm::mat3>()),
+fillColor(fillColor),
+outlineColor(outlineColor)
+{}
+
+Tri::Shape& Tri::Shape::resetTransform() {
+    transform = glm::identity<glm::mat3>();
+    return *this;
+}
+
+Tri::Shape& Tri::Shape::translate(const glm::vec2 move) {
+    transform = glm::translate(transform, move);
+    return *this;
+}
+
+Tri::Shape& Tri::Shape::rotate(const float angle) {
+    transform = glm::rotate(transform, angle);
+    return *this;
+}
+
+Tri::Shape& Tri::Shape::scale(const glm::vec2 scale) {
+    transform = glm::scale(transform, scale);
+    return *this;
+}

src/shape.hpp

@@ -0,0 +1,40 @@
+#ifndef TRIANGLES_SHAPE_HPP
+#define TRIANGLES_SHAPE_HPP
+
+#include <vector>
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Weffc++"
+#include <raylib.h>
+#include <glm/glm.hpp>
+#pragma GCC diagnostic pop
+
+namespace Tri {
+
+struct Shape {
+    Shape();
+    Shape(Color fillColor);
+    Shape(Color fillColor, Color outlineColor);
+    virtual ~Shape() {}
+
+    glm::mat3 transform;
+    Color fillColor;
+    Color outlineColor;
+
+    Shape& resetTransform();
+    Shape& translate(const glm::vec2 move);
+    Shape& rotate(const float angle);
+    Shape& scale(const glm::vec2 scale);
+
+    virtual Shape& draw() = 0;
+
+    virtual void getVertices(std::vector<glm::vec2> &verticesOut) const = 0;
+    virtual void getTransformedVertices(std::vector<glm::vec2> &verticesOut) const = 0;
+
+    virtual float getRadius() const = 0;
+    virtual void setRadius(float radius) = 0;
+}; // struct Shape
+
+} // namespace Tri
+
+#endif

src/state.cpp

@@ -4,270 +4,430 @@
 #include <cassert>
 #include <string>
 #include <cmath>
+#include <cstdio>
 
-#include <imgui-SFML.h>
+#include <raylib.h>
 
 #include "helpers.hpp"
 
 #define STARTING_HELP_FADE_RATE 0.2f
 
-#ifndef NDEBUG
-# include <cstdio>
-#endif
-
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
 Tri::State::State(int argc, char **argv) :
-width(800),
-height(600),
-dt(sf::microseconds(16666)),
-notification_alpha(1.0f),
-window(sf::VideoMode(800, 600), "Triangles", sf::Style::Titlebar | sf::Style::Close),
-trisIndex(0),
+flags(),
+width(DEFAULT_WIDTH),
+height(DEFAULT_HEIGHT),
+dt(1.0f/60.0f),
+notificationAlpha(1.0f),
+notificationText(),
+tris(),
+currentTri(),
 currentTri_state(CurrentState::NONE),
-currentTri_maxState(CurrentState::NONE),
-colorPickerColor{1.0f, 1.0f, 1.0f, 1.0f},
-bgColorPickerColor{0.0f, 0.0f, 0.0f},
-bgColor(sf::Color::Black),
-inputWidthHeight{800, 600},
-pi(std::acos(-1.0f))
+pointCircle({7.0F, 7.0F}, 7.0F, WHITE),
+colorPickerColor{255, 255, 255, 255},
+bgColorPickerColor{0, 0, 0, 255},
+bgColor(BLACK),
+saveFilenameBuffer(),
+failedMessage(),
+drawCache(),
+pi(std::acos(-1.0f)),
+selectedTri(),
+selectedTriColor{255, 255, 255, 255},
+selectedTriBlinkTimer(),
+inputWidth(800),
+inputHeight(600),
+history(),
+history_idx(0)
 {
+    InitWindow(width, height, "Triangles");
+    SetTargetFPS(60);
+
     flags.set(F_IS_RUNNING); // is running
-    ImGui::SFML::Init(window);
-    window.setFramerateLimit(60);
 
     set_notification_text("Press \"H\" for help");
 
-    pointCircle.setRadius(7.0f);
-    pointCircle.setOrigin(7.0f, 7.0f);
-    pointCircle.setFillColor(sf::Color::White);
-    pointCircle.setOutlineColor(sf::Color::Black);
-    pointCircle.setOutlineThickness(1.0f);
-
     saveFilenameBuffer.fill(0);
 
-    if(!drawCache.create(800, 600)) {
-#ifndef NDEBUG
-        puts("ERROR: Failed to initialize RenderTexture (draw cache)");
-#endif
-        flags.reset(F_DRAW_CACHE_INITIALIZED);
-    } else {
-        flags.set(F_DRAW_CACHE_INITIALIZED);
-        flags.set(F_DRAW_CACHE_DIRTY);
-        drawCacheSprite.setTexture(drawCache.getTexture(), true);
+    drawCache = LoadRenderTexture(width, height);
+    flags.set(F_DRAW_CACHE_INITIALIZED);
+    flags.set(F_DRAW_CACHE_DIRTY);
+
+    GuiSetStyle(DEFAULT, BACKGROUND_COLOR, 0x303030);
+}
+#pragma GCC diagnostic pop
+
+Tri::State::Action::Action() :
+type(Tri::State::Action::AT_NONE),
+idx(0),
+color(BLACK),
+data{{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}}
+{}
+
+Tri::State::Action::Action(const Type& type, IndexT idx, const Color& color, float *data) :
+type(type),
+idx(idx),
+color(color),
+data()
+{
+    init(data);
+}
+
+Tri::State::Action::Action(Type&& type, IndexT idx, Color&& color, float *data) :
+type(type),
+idx(idx),
+color(color),
+data()
+{
+    init(data);
+}
+
+void Tri::State::Action::init(float *data) {
+    switch(type) {
+    case AT_TRI:
+    case AT_TRI_DEL:
+        for(unsigned int i = 0; i < 6; ++i) {
+            this->data.tri[i] = data[i];
+        }
+        break;
+    case AT_POINT:
+        this->data.point[0] = data[0];
+        this->data.point[1] = data[1];
+        break;
+    default:
+        type = AT_NONE;
+        idx = 0;
+        color = BLACK;
+        this->data = {{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f}};
+        break;
     }
 }
 
 Tri::State::~State() {
-    window.close();
-    ImGui::SFML::Shutdown();
+    UnloadRenderTexture(drawCache);
+    CloseWindow();
 }
 
 void Tri::State::handle_events() {
-    while(window.pollEvent(event)) {
-        ImGui::SFML::ProcessEvent(event);
-        if(event.type == sf::Event::Closed) {
-            window.close();
-            flags.reset(F_IS_RUNNING);
-        } else if(event.type == sf::Event::KeyPressed) {
-            if(!flags.test(F_DISPLAY_SAVE)) {
-                // TODO use a switch statement
-                if(event.key.code == sf::Keyboard::H) {
-                    flags.flip(F_DISPLAY_HELP);
-                } else if(event.key.code == sf::Keyboard::U) {
-                    flags.set(F_DRAW_CACHE_DIRTY);
-                    if(currentTri_state > 0) {
-                        switch(currentTri_state) {
-                        case FIRST:
-                            currentTri_state = CurrentState::NONE;
-                            break;
-                        case SECOND:
-                            currentTri_state = CurrentState::FIRST;
-                            break;
-                        default:
-                            assert(!"Unreachable code");
-                            break;
-                        }
-                    } else if(trisIndex > 0) {
-                        --trisIndex;
-                    }
-                } else if(event.key.code == sf::Keyboard::R) {
-                    flags.set(F_DRAW_CACHE_DIRTY);
-                    if(currentTri_state != CurrentState::NONE
-                            && currentTri_state < currentTri_maxState) {
-                        switch(currentTri_state) {
-                        case NONE:
-                            currentTri_state = CurrentState::FIRST;
-                            break;
-                        case FIRST:
-                            currentTri_state = CurrentState::SECOND;
-                            break;
-                        default:
-                            assert(!"Unreachable code");
-                            break;
-                        }
-                    } else if(tris.size() > trisIndex) {
-                        ++trisIndex;
-                    } else if(currentTri_state < currentTri_maxState) {
-                        switch(currentTri_state) {
-                        case NONE:
-                            currentTri_state = CurrentState::FIRST;
-                            break;
-                        case FIRST:
-                            currentTri_state = CurrentState::SECOND;
-                            break;
-                        default:
-                            assert(!"Unreachable code");
-                            break;
-                        }
-                    }
-                } else if(event.key.code == sf::Keyboard::C) {
-                    if(flags.test(F_DISPLAY_COLOR_P)) {
-                        close_color_picker();
-                    } else {
-                        flags.set(F_DISPLAY_COLOR_P);
-                    }
-                } else if(event.key.code == sf::Keyboard::B) {
-                    if(flags.test(F_DISPLAY_BG_COLOR_P)) {
-                        close_bg_color_picker();
-                    } else {
-                        flags.set(F_DISPLAY_BG_COLOR_P);
-                    }
-                } else if(event.key.code == sf::Keyboard::S) {
-                    flags.flip(F_DISPLAY_SAVE);
-                } else if(event.key.code == sf::Keyboard::P) {
-                    flags.flip(F_COPY_COLOR_MODE);
-                    if(flags.test(F_COPY_COLOR_MODE)) {
-                        set_notification_text(
-                            "Copy color mode\n"
-                            "Click to change\n"
-                            "current draw color\n"
-                            "to what was\n"
-                            "clicked on");
-                    } else {
-                        notification_alpha = 0.0f;
-                    }
-                } else if(event.key.code == sf::Keyboard::I) {
-                    flags.flip(F_DISPLAY_CHANGE_SIZE);
-                    if(!flags.test(F_DISPLAY_CHANGE_SIZE)) {
-                        inputWidthHeight[0] = width;
-                        inputWidthHeight[1] = height;
-                    }
-                } else if(event.key.code == sf::Keyboard::E) {
-                    if(flags.test(F_TRI_EDIT_MODE)) {
-                        close_selected_tri_mode();
-                    } else {
-                        flags.flip(F_SELECT_TRI_MODE);
-                        if(flags.test(F_SELECT_TRI_MODE)) {
-                            set_notification_text("Click on a tri\nto edit it");
-                        }
-                    }
-                }
-            }
-        } else if(event.type == sf::Event::MouseButtonPressed) {
-            if(can_draw()) {
-                switch(currentTri_state) {
-                case CurrentState::NONE:
-                    currentTri[0] = sf::Vector2f(event.mouseButton.x, event.mouseButton.y);
-                    if(trisIndex < tris.size()) {
-                        tris.resize(trisIndex);
-                    }
-                    currentTri_state = CurrentState::FIRST;
-                    currentTri_maxState = CurrentState::FIRST;
-                    break;
-                case CurrentState::FIRST:
-                    currentTri[1] = sf::Vector2f(event.mouseButton.x, event.mouseButton.y);
-                    if(trisIndex < tris.size()) {
-                        tris.resize(trisIndex);
-                    }
-                    currentTri_state = CurrentState::SECOND;
-                    currentTri_maxState = CurrentState::SECOND;
-                    break;
-                case CurrentState::SECOND:
-                    currentTri[2] = sf::Vector2f(event.mouseButton.x, event.mouseButton.y);
-                    if(trisIndex < tris.size()) {
-                        tris.resize(trisIndex);
-                    }
-                    ++trisIndex;
-                    tris.emplace_back(sf::ConvexShape(3));
-                    tris.back().setPoint(0, currentTri[0]);
-                    tris.back().setPoint(1, currentTri[1]);
-                    tris.back().setPoint(2, currentTri[2]);
-                    tris.back().setFillColor(pointCircle.getFillColor());
-                    currentTri_state = CurrentState::NONE;
-                    currentTri_maxState = CurrentState::NONE;
-                    flags.set(F_DRAW_CACHE_DIRTY);
-                    break;
-                }
-            } else if(flags.test(F_COPY_COLOR_MODE)) {
-                auto color = drawCache.getTexture().copyToImage()
-                    .getPixel(event.mouseButton.x, event.mouseButton.y);
-                colorPickerColor[0] = color.r / 255.0f;
-                colorPickerColor[1] = color.g / 255.0f;
-                colorPickerColor[2] = color.b / 255.0f;
-                colorPickerColor[3] = 1.0f;
-                pointCircle.setFillColor(color);
-                flags.reset(F_COPY_COLOR_MODE);
-                set_notification_text("Color set");
-            } else if(flags.test(F_SELECT_TRI_MODE)) {
-                sf::Vector2f mouseXY = window.mapPixelToCoords(
-                    {event.mouseButton.x, event.mouseButton.y});
-                for(unsigned int i = trisIndex; i-- > 0; ) {
-                    if(is_within_shape(tris.at(i), mouseXY)) {
-                        selectedTri = i;
-                        tris[i].setOutlineColor(invert_color(tris[i].getFillColor()));
-                        flags.reset(F_SELECT_TRI_MODE);
-                        flags.set(F_TRI_EDIT_MODE);
-                        flags.set(F_TRI_EDIT_DRAW_TRI);
-                        selectedTriBlinkTimer = 1.0f;
-                        selectedTriColor[0] = tris[i].getFillColor().r / 255.0f;
-                        selectedTriColor[1] = tris[i].getFillColor().g / 255.0f;
-                        selectedTriColor[2] = tris[i].getFillColor().b / 255.0f;
-                        selectedTriColor[3] = tris[i].getFillColor().a / 255.0f;
+    if(WindowShouldClose()) {
+        flags.reset(F_IS_RUNNING);
+    }
+
+    int keyPressed = GetKeyPressed();
+    while(keyPressed > 0) {
+        if(!flags.test(F_DISPLAY_SAVE)) {
+            switch(keyPressed) {
+            case KEY_H:
+                flags.flip(F_DISPLAY_HELP);
+                break;
+            case KEY_U:
+                flags.set(F_DRAW_CACHE_DIRTY);
+                if (history_idx > 0) {
+                    switch(history[history_idx-1].type) {
+                    case Action::AT_TRI:
+                        tris.erase(
+                            tris.cbegin() + history[history_idx-1].idx);
+                        restore_points_on_tri_del(history_idx - 1);
+                        break;
+                    case Action::AT_TRI_DEL:
+                    {
+                        tris.emplace(
+                            tris.cbegin() + history[history_idx].idx,
+                            Triangle(
+                                {{
+                                    {history[history_idx-1].data.tri[0],
+                                     history[history_idx-1].data.tri[1]},
+                                    {history[history_idx-1].data.tri[2],
+                                     history[history_idx-1].data.tri[3]},
+                                    {history[history_idx-1].data.tri[4],
+                                     history[history_idx-1].data.tri[5]},
+                                }},
+                                history[history_idx-1].color
+                            )
+                        );
+                        currentTri_state = CurrentState::NONE;
                         break;
                     }
+                    case Action::AT_POINT:
+                        assert(history[history_idx-1].idx + 1 == currentTri_state
+                            && "Point in history must match point index");
+                        assert(currentTri_state > 0
+                            && "There must be a point to undo a point");
+                        currentTri_state = static_cast<CurrentState>(currentTri_state - 1);
+                        break;
+                    default:
+                        assert(!"Unreachable code");
+                        break;
+                    }
+                    --history_idx;
                 }
-                if(!flags.test(F_TRI_EDIT_MODE)) {
-                    set_notification_text("Did not select\nanything");
+                break;
+            case KEY_R:
+                flags.set(F_DRAW_CACHE_DIRTY);
+                if(history_idx < history.size()) {
+                    switch(history[history_idx].type) {
+                    case Action::AT_TRI:
+                    {
+                        tris.emplace(
+                            tris.cbegin() + history[history_idx].idx,
+                            Triangle(
+                                {{
+                                    {history[history_idx].data.tri[0],
+                                     history[history_idx].data.tri[1]},
+                                    {history[history_idx].data.tri[2],
+                                     history[history_idx].data.tri[3]},
+                                    {history[history_idx].data.tri[4],
+                                     history[history_idx].data.tri[5]},
+                                }},
+                                history[history_idx].color
+                            )
+                        );
+                        currentTri_state = CurrentState::NONE;
+                        break;
+                    }
+                        break;
+                    case Action::AT_TRI_DEL:
+                        tris.erase(
+                            tris.cbegin() + history[history_idx].idx);
+                        restore_points_on_tri_del(history_idx);
+                        break;
+                    case Action::AT_POINT:
+                        assert(history[history_idx].idx == currentTri_state
+                            && "Point in history must match point index");
+                        assert(currentTri_state < CurrentState::SECOND
+                            && "Current point state must be 0 or 1");
+                        currentTri[currentTri_state].x = history[history_idx].data.point[0];
+                        currentTri[currentTri_state].y = history[history_idx].data.point[1];
+                        currentTri_state = static_cast<CurrentState>(
+                            currentTri_state + 1);
+                        pointCircle.fillColor = history[history_idx].color;
+                        break;
+                    default:
+                        assert(!"Unreachable code");
+                        break;
+                    }
+                    ++history_idx;
                 }
+                break;
+            case KEY_C:
+                if(flags.test(F_DISPLAY_COLOR_P)) {
+                    close_color_picker();
+                } else {
+                    flags.set(F_DISPLAY_COLOR_P);
+                }
+                break;
+            case KEY_B:
+                if(flags.test(F_DISPLAY_BG_COLOR_P)) {
+                    close_bg_color_picker();
+                } else {
+                    flags.set(F_DISPLAY_BG_COLOR_P);
+                }
+                break;
+            case KEY_S:
+                flags.flip(F_DISPLAY_SAVE);
+                break;
+            case KEY_P:
+                flags.flip(F_COPY_COLOR_MODE);
+                if(flags.test(F_COPY_COLOR_MODE)) {
+                    set_notification_text(
+                        "Copy color mode\n"
+                        "Click to change\n"
+                        "current draw color\n"
+                        "to what was\n"
+                        "clicked on");
+                } else {
+                    notificationAlpha = 0.0f;
+                }
+                break;
+            case KEY_I:
+                flags.flip(F_DISPLAY_CHANGE_SIZE);
+                if(!flags.test(F_DISPLAY_CHANGE_SIZE)) {
+                    close_input_width_height_window();
+                } else {
+                    failedMessage = "Press TAB to switch between width/height";
+                }
+                break;
+            case KEY_E:
+                if(flags.test(F_TRI_EDIT_MODE)) {
+                    close_selected_tri_mode();
+                } else {
+                    flags.flip(F_SELECT_TRI_MODE);
+                    if(flags.test(F_SELECT_TRI_MODE)) {
+                        set_notification_text("Click on a tri\nto edit it");
+                    }
+                }
+                break;
+            case KEY_TAB:
+                flags.flip(F_TAB_TOGGLE);
+                break;
+            }
+        }
+        keyPressed = GetKeyPressed();
+    }
+
+    if(IsMouseButtonPressed(MOUSE_LEFT_BUTTON)) {
+        if(can_draw()) {
+            switch(currentTri_state) {
+            case CurrentState::NONE: {
+                currentTri[0] = {GetMouseX(), GetMouseY()};
+                currentTri_state = CurrentState::FIRST;
+                if(history_idx < history.size()) {
+                    history.resize(history_idx);
+                }
+                float points[2] = {currentTri[0].x, currentTri[0].y};
+                history.push_back(Action(Action::AT_POINT,
+                                         0,
+                                         pointCircle.fillColor,
+                                         points));
+                ++history_idx;
+                break; }
+            case CurrentState::FIRST: {
+                currentTri[1] = {GetMouseX(), GetMouseY()};
+                currentTri_state = CurrentState::SECOND;
+                if(history_idx < history.size()) {
+                    history.resize(history_idx);
+                }
+                float points[2] = {currentTri[1].x, currentTri[1].y};
+                history.push_back(Action(Action::AT_POINT,
+                                         1,
+                                         pointCircle.fillColor,
+                                         points));
+                ++history_idx;
+                break; }
+            case CurrentState::SECOND: {
+                currentTri[2] = {GetMouseX(), GetMouseY()};
+                make_counter_clockwise(currentTri);
+                tris.emplace_back(currentTri, pointCircle.fillColor);
+                currentTri_state = CurrentState::NONE;
+                flags.set(F_DRAW_CACHE_DIRTY);
+
+                if(history_idx < history.size()) {
+                    history.resize(history_idx);
+                }
+                float points[6] = {
+                    currentTri[0].x, currentTri[0].y,
+                    currentTri[1].x, currentTri[1].y,
+                    currentTri[2].x, currentTri[2].y,
+                };
+                history.push_back(Action(Action::AT_TRI,
+                                         tris.size()-1,
+                                         pointCircle.fillColor,
+                                         points));
+                ++history_idx;
+                break; }
+            }
+        } else if(flags.test(F_COPY_COLOR_MODE)) {
+            check_draw_cache();
+            Image drawImage = LoadImageFromTexture(drawCache.texture);
+            Color *colors = LoadImageColors(drawImage);
+            int mx = GetMouseX();
+            int my = GetMouseY();
+            if(mx < 0) { mx = 0; }
+            else if(mx >= drawImage.width) { mx = drawImage.width - 1; }
+            if(my < 0) { my = 0; }
+            else if(my >= drawImage.height) { my = drawImage.height - 1; }
+
+            my = drawImage.height - my;
+
+            colorPickerColor = colors[mx + my * drawImage.width];
+
+            pointCircle.fillColor = colors[mx + my * drawImage.width];
+            flags.reset(F_COPY_COLOR_MODE);
+            set_notification_text("Color set");
+
+            UnloadImageColors(colors);
+            UnloadImage(drawImage);
+        } else if(flags.test(F_SELECT_TRI_MODE)) {
+            int mx = GetMouseX();
+            int my = GetMouseY();
+            if(mx < 0) { mx = 0; }
+            else if(mx >= (int)width) { mx = width - 1; }
+            if(my < 0) { my = 0; }
+            else if(my >= (int)height) { my = height - 1; }
+
+            for (auto &tri : tris) {
+                if(is_within_shape(tri, {mx, my})) {
+                    tri.outlineColor = invert_color(tri.fillColor);
+                    flags.reset(F_SELECT_TRI_MODE);
+                    flags.set(F_TRI_EDIT_MODE);
+                    flags.set(F_TRI_EDIT_DRAW_TRI);
+                    selectedTriBlinkTimer = 1.0f;
+                    selectedTriColor = tri.fillColor;
+                    break;
+                }
+            }
+            if(!flags.test(F_TRI_EDIT_MODE)) {
+                set_notification_text("Did not select\nanything");
             }
         }
     }
 }
 
 void Tri::State::update() {
-    ImGui::SFML::Update(window, dt);
+    dt = GetFrameTime();
 
-    if(notification_alpha > 0.0f) {
-        notification_alpha -= dt.asSeconds() * STARTING_HELP_FADE_RATE;
-        if(notification_alpha < 0.0f) {
-            notification_alpha = 0.0f;
+    if(notificationAlpha > 0.0f) {
+        notificationAlpha -= dt * STARTING_HELP_FADE_RATE;
+        if(notificationAlpha < 0.0f) {
+            notificationAlpha = 0.0f;
         }
     }
 
     if(flags.test(F_COLOR_P_COLOR_DIRTY)) {
         flags.reset(F_COLOR_P_COLOR_DIRTY);
-        pointCircle.setFillColor(sf::Color(
-            (unsigned char)(255 * colorPickerColor[0]),
-            (unsigned char)(255 * colorPickerColor[1]),
-            (unsigned char)(255 * colorPickerColor[2]),
-            (unsigned char)(255 * colorPickerColor[3])));
+        pointCircle.fillColor = colorPickerColor;
     }
 
     if(flags.test(F_BG_COLOR_P_COLOR_DIRTY)) {
         flags.reset(F_BG_COLOR_P_COLOR_DIRTY);
-        bgColor.r = (unsigned char)(255 * bgColorPickerColor[0]);
-        bgColor.g = (unsigned char)(255 * bgColorPickerColor[1]);
-        bgColor.b = (unsigned char)(255 * bgColorPickerColor[2]);
+        bgColor = bgColorPickerColor;
+        bgColor.a = 255;
     }
 
     if(flags.test(F_TRI_EDIT_MODE)) {
-        selectedTriBlinkTimer -= dt.asSeconds() * TRIANGLES_EDIT_TRI_BLINK_RATE;
+        selectedTriBlinkTimer -= dt * TRIANGLES_EDIT_TRI_BLINK_RATE;
         if(selectedTriBlinkTimer <= 0.0f) {
             selectedTriBlinkTimer = 1.0f;
             flags.flip(F_TRI_EDIT_DRAW_TRI);
         }
     }
+}
+
+void Tri::State::draw() {
+    // Should be able to directly draw a texture held by the RenderTexture2D
+    if(flags.test(F_DRAW_CACHE_INITIALIZED)) {
+        // draw cache initialized
+        check_draw_cache();
+        BeginDrawing();
+        // hack to flip in the y direction, since RenderTexture2D's texture
+        // is flipped
+        DrawTextureRec(
+            drawCache.texture,
+            {
+                0.0f,
+                0.0f,
+                (float)drawCache.texture.width,
+                (float)-drawCache.texture.height
+            },
+            {0.0f, 0.0f},
+            WHITE);
+    } else {
+        BeginDrawing();
+        draw_to_target(nullptr);
+    }
+
+    if(flags.test(F_TRI_EDIT_MODE) && flags.test(F_TRI_EDIT_DRAW_TRI)) {
+//        tris.at(selectedTri).setOutlineThickness(4.0f);
+        tris[selectedTri].draw();
+//        tris.at(selectedTri).setOutlineThickness(0.0f);
+    }
+
+    if(can_draw()) {
+        for(unsigned int i = 0; i < currentTri_state; ++i) {
+            DrawCircle(currentTri[i].x, currentTri[i].y, pointCircle.getRadius(), pointCircle.fillColor);
+        }
+    }
 
-    // Seems misleading, but imgui handles setting up the window during update
     Tri::draw_notification(this);
     Tri::draw_color_picker(this);
     Tri::draw_bg_color_picker(this);
@@ -276,49 +436,28 @@ void Tri::State::update() {
     Tri::draw_save(this);
     Tri::draw_help(this);
 
-    ImGui::EndFrame();
+    EndDrawing();
 }
 
-void Tri::State::draw() {
-    if(flags.test(F_DRAW_CACHE_INITIALIZED)) {
-        // draw cache initialized
-        if(flags.test(F_DRAW_CACHE_DIRTY)) {
-            // draw cache dirty
-            flags.reset(F_DRAW_CACHE_DIRTY);
-            draw_to_target(&drawCache);
-            drawCache.display();
+void Tri::State::draw_to_target(RenderTexture2D *target) {
+    if(target) {
+        BeginTextureMode(*target);
+        ClearBackground(bgColor);
+
+        // draw tris
+        for(unsigned int i = 0; i < tris.size(); ++i) {
+            tris[i].draw();
         }
-        window.draw(drawCacheSprite);
+        EndTextureMode();
     } else {
-        draw_to_target(&window);
-    }
+        // Expects BeginDrawing() already having been called prior to this fn
+        ClearBackground(bgColor);
 
-    if(flags.test(F_TRI_EDIT_MODE) && flags.test(F_TRI_EDIT_DRAW_TRI)) {
-        tris.at(selectedTri).setOutlineThickness(4.0f);
-        window.draw(tris[selectedTri]);
-        tris.at(selectedTri).setOutlineThickness(0.0f);
-    }
-
-    if(can_draw()) {
-        for(unsigned int i = 0; i < currentTri_state; ++i) {
-            pointCircle.setPosition(currentTri[i]);
-            window.draw(pointCircle);
+        // draw tris
+        for(unsigned int i = 0; i < tris.size(); ++i) {
+            tris[i].draw();
         }
     }
-
-    // draw gui stuff
-    ImGui::SFML::Render(window);
-
-    window.display();
-}
-
-void Tri::State::draw_to_target(sf::RenderTarget *target) {
-    target->clear(bgColor);
-
-    // draw tris
-    for(unsigned int i = 0; i < trisIndex; ++i) {
-        target->draw(tris[i]);
-    }
 }
 
 unsigned int Tri::State::get_width() const {
@@ -334,66 +473,73 @@ const Tri::State::BitsetType Tri::State::get_flags() const {
 }
 
 float Tri::State::get_notification_alpha() const {
-    return notification_alpha;
+    return notificationAlpha;
 }
 
 const char* Tri::State::get_notification_text() const {
-    return notification_text.data();
+    return notificationText.data();
 }
 
 void Tri::State::set_notification_text(const char *text) {
-    notification_text.fill(0);
-    std::strncpy(notification_text.data(),
+    notificationText.fill(0);
+    std::strncpy(notificationText.data(),
         text,
-        notification_text.max_size() - 1);
-    notification_alpha = 1.0f;
+        notificationText.max_size() - 1);
+    notificationAlpha = 1.0f;
 }
 
-float* Tri::State::get_color() {
+void Tri::State::append_notification_text(const char *text) {
+    auto length = std::strlen(notificationText.data());
+    if(length + 1 >= notificationText.max_size()) {
+        return;
+    }
+    std::strncpy(
+        notificationText.data() + length,
+        text,
+        notificationText.max_size() - length - 1);
+    notificationAlpha = 1.0f;
+}
+
+Color& Tri::State::get_color() {
     flags.set(F_COLOR_P_COLOR_DIRTY);
     return colorPickerColor;
 }
 
-float* Tri::State::get_bg_color() {
+Color& Tri::State::get_bg_color() {
     flags.set(F_BG_COLOR_P_COLOR_DIRTY);
     return bgColorPickerColor;
 }
 
-Tri::State::FilenameBufferType* Tri::State::get_save_filename_buffer() {
+std::array<char, 256>* Tri::State::get_save_filename_buffer() {
     return &saveFilenameBuffer;
 }
 
 bool Tri::State::do_save() {
-    sf::RenderTexture saveTexture;
-    if(!saveTexture.create(width, height)) {
-#ifndef NDEBUG
-        puts("ERROR: Failed to create texture for saving");
-#endif
-        failedMessage = std::string("Failed to create texture for saving");
-        return false;
-    }
+    RenderTexture2D saveTexture = LoadRenderTexture(width, height);
 
     draw_to_target(&saveTexture);
-    saveTexture.display();
 
-    sf::Image saveImage = saveTexture.getTexture().copyToImage();
-    std::string filename = std::string(saveFilenameBuffer.data());
-    if(saveImage.saveToFile(filename)) {
+    Image saveImage = LoadImageFromTexture(saveTexture.texture);
+    ImageFlipVertical(&saveImage);
+    UnloadRenderTexture(saveTexture);
+    if(ExportImage(saveImage, saveFilenameBuffer.data())) {
 #ifndef NDEBUG
-        printf("Saved to \"%s\"\n", filename.c_str());
+        printf("Saved to \"%s\"\n", saveFilenameBuffer.data());
 #endif
         failedMessage.clear();
+        UnloadImage(saveImage);
         return true;
     } else {
 #ifndef NDEBUG
-        printf("ERROR: Failed to save \"%s\"\n", filename.c_str());
+        printf("ERROR: Failed to save \"%s\"\n", saveFilenameBuffer.data());
 #endif
         failedMessage = std::string("Failed to save (does the name end in \".png\"?)");
+        UnloadImage(saveImage);
         return false;
     }
 }
 
-std::string_view Tri::State::failed_message() const {
+const std::string& Tri::State::failed_message() const {
     return failedMessage;
 }
 
@@ -438,39 +584,35 @@ void Tri::State::close_bg_color_picker() {
 }
 
 bool Tri::State::change_width_height() {
-    std::bitset<2> warnings;
-    if(inputWidthHeight[0] < 0 || inputWidthHeight[1] < 0) {
+    if(inputWidth < 0 || inputHeight < 0) {
         failedMessage = "Width or Height cannot be less than 0";
         return false;
     }
-    if(inputWidthHeight[0] < 200) {
-        inputWidthHeight[0] = 200;
-        warnings.set(F_DISPLAY_HELP);
+    if(inputWidth < 800) {
+        inputWidth = 800;
     }
-    if(inputWidthHeight[1] < 150) {
-        inputWidthHeight[1] = 150;
-        warnings.set(F_IS_RUNNING);
+    if(inputHeight < 600) {
+        inputHeight = 600;
     }
 
-    if(warnings.test(0) && warnings.test(1)) {
-        set_notification_text("Width set to 200\nHeight set to 150");
-    } else if(warnings.test(0)) {
-        set_notification_text("Width set to 200");
-    } else if(warnings.test(1)) {
-        set_notification_text("Height set to 150");
-    }
+    notificationText.fill(0);
+    std::array<char, 5> tempBuf = {0, 0, 0, 0, 0};
 
-    this->width = inputWidthHeight[0];
-    this->height = inputWidthHeight[1];
+    append_notification_text("Width set to ");
+    snprintf(tempBuf.data(), 5, "%u", inputWidth);
+    append_notification_text(tempBuf.data());
 
-    window.setSize({this->width, this->height});
-    sf::View newView(
-        sf::Vector2f(width / 2.0f, height / 2.0f),
-        sf::Vector2f(width, height));
-    window.setView(newView);
+    append_notification_text(", Height set to ");
+    snprintf(tempBuf.data(), 5, "%u", inputHeight);
+    append_notification_text(tempBuf.data());
+
+    this->width = inputWidth;
+    this->height = inputHeight;
+
+    UnloadRenderTexture(drawCache);
+    SetWindowSize(this->width, this->height);
+    drawCache = LoadRenderTexture(this->width, this->height);
 
-    drawCache.create(width, height);
-    drawCacheSprite.setTexture(drawCache.getTexture(), true);
     flags.set(F_DRAW_CACHE_DIRTY);
 
     currentTri_state = CurrentState::NONE;
@@ -478,11 +620,10 @@ bool Tri::State::change_width_height() {
     return true;
 }
 
-int* Tri::State::get_input_width_height() {
-    return inputWidthHeight;
-}
-
 void Tri::State::close_input_width_height_window() {
+    failedMessage.clear();
+    inputWidth = width;
+    inputHeight = height;
     flags.reset(F_DISPLAY_CHANGE_SIZE);
 }
 
@@ -490,21 +631,58 @@ float Tri::State::get_pi() const {
     return pi;
 }
 
-float* Tri::State::get_selected_tri_color() {
-    tris.at(selectedTri).setFillColor(sf::Color(
-        (unsigned char)(255.0f * selectedTriColor[0]),
-        (unsigned char)(255.0f * selectedTriColor[1]),
-        (unsigned char)(255.0f * selectedTriColor[2]),
-        (unsigned char)(255.0f * selectedTriColor[3])));
+Color& Tri::State::get_selected_tri_color() {
+    tris.at(selectedTri).fillColor = selectedTriColor;
     return selectedTriColor;
 }
 
 void Tri::State::close_selected_tri_mode() {
-    tris.at(selectedTri).setFillColor(sf::Color(
-        (unsigned char)(255.0f * selectedTriColor[0]),
-        (unsigned char)(255.0f * selectedTriColor[1]),
-        (unsigned char)(255.0f * selectedTriColor[2]),
-        (unsigned char)(255.0f * selectedTriColor[3])));
+    tris.at(selectedTri).fillColor = selectedTriColor;
     flags.set(F_DRAW_CACHE_DIRTY);
     reset_modes();
 }
+
+bool Tri::State::check_draw_cache() {
+    if(flags.test(F_DRAW_CACHE_INITIALIZED) && flags.test(F_DRAW_CACHE_DIRTY)) {
+        // draw cache initialized and dirty
+        flags.reset(F_DRAW_CACHE_DIRTY);
+        draw_to_target(&drawCache);
+        return true;
+    } else {
+        return false;
+    }
+}
+
+int* Tri::State::get_input_width() {
+    return &inputWidth;
+}
+
+int* Tri::State::get_input_height() {
+    return &inputHeight;
+}
+
+void Tri::State::restore_points_on_tri_del(Action::IndexT end) {
+    assert(end < history.size()
+        && "Index on history must be in range");
+    currentTri[2].x = history[end].data.tri[4];
+    currentTri[2].y = history[end].data.tri[5];
+    pointCircle.fillColor = history[end].color;
+    unsigned int currentTriIdx = 1;
+    while(end-- > 0) {
+        if(history[end].type == Action::AT_POINT) {
+            assert(history[end].idx == currentTriIdx
+                && "Last point must be second point");
+            currentTri[currentTriIdx].x = history[end].data.point[0];
+            currentTri[currentTriIdx].y = history[end].data.point[1];
+            if(currentTriIdx > 0) {
+                --currentTriIdx;
+            } else {
+                currentTri_state = CurrentState::SECOND;
+                return;
+            }
+        }
+    }
+
+    assert(!"Unreachable code");
+    return;
+}

src/state.hpp

@@ -7,8 +7,13 @@
 #include <vector>
 #include <array>
 
-#include <SFML/System.hpp>
-#include <SFML/Graphics.hpp>
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Weffc++"
+#include "glm/glm.hpp"
+#pragma GCC diagnostic pop
+
+#include "triangle.hpp"
+#include "circle.hpp"
 
 namespace Tri {
     class State {
@@ -32,55 +37,85 @@ namespace Tri {
             F_SELECT_TRI_MODE           = 11,
             F_TRI_EDIT_MODE             = 12,
             F_TRI_EDIT_DRAW_TRI         = 13,
+            F_TAB_TOGGLE                = 14,
         };
 
     private:
+        struct Action {
+        public:
+            typedef std::vector<Action>::size_type IndexT;
+
+            enum Type {
+                AT_TRI,
+                AT_TRI_DEL,
+                AT_POINT,
+                AT_NONE,
+            };
+
+            Action();
+            Action(const Type& type,
+                   IndexT idx,
+                   const Color& color,
+                   float *data);
+            Action(Type&& type,
+                   IndexT idx,
+                   Color&& color,
+                   float *data);
+
+            Type type;
+            IndexT idx;
+            Color color;
+            union Data {
+                float tri[6];
+                float point[2];
+            } data;
+
+        private:
+            void init(float *data);
+        };
+
         // use enum FlagName
         typedef std::bitset<64> BitsetType;
         BitsetType flags;
         unsigned int width;
         unsigned int height;
-        const sf::Time dt;
-        float notification_alpha;
-        typedef std::array<char, 256> NotificationBufferType;
-        NotificationBufferType notification_text;
+        float dt;
+        float notificationAlpha;
+        std::array<char, 256> notificationText;
 
-        sf::RenderWindow window;
-        std::vector<sf::ConvexShape> tris;
-        unsigned int trisIndex;
-        sf::Vector2f currentTri[3];
+        std::vector<Triangle> tris;
+        std::array<glm::vec2, 3> currentTri;
         CurrentState currentTri_state;
-        CurrentState currentTri_maxState;
-        sf::CircleShape pointCircle;
+        Circle pointCircle;
 
-        sf::Event event;
+        Color colorPickerColor;
+        Color bgColorPickerColor;
+        Color bgColor;
 
-        float colorPickerColor[4];
-        float bgColorPickerColor[3];
-        sf::Color bgColor;
-
-        typedef std::array<char, 256> FilenameBufferType;
-        FilenameBufferType saveFilenameBuffer;
+        std::array<char, 256> saveFilenameBuffer;
         std::string failedMessage;
 
-        sf::RenderTexture drawCache;
-        sf::Sprite drawCacheSprite;
-
-        int inputWidthHeight[2];
+        RenderTexture2D drawCache;
 
         const float pi;
 
         unsigned int selectedTri;
-        float selectedTriColor[4];
+        Color selectedTriColor;
         float selectedTriBlinkTimer;
 
+        int inputWidth;
+        int inputHeight;
+
+        std::vector<Action> history;
+        Action::IndexT history_idx;
+
     public:
         void handle_events();
         void update();
         void draw();
 
     private:
-        void draw_to_target(sf::RenderTarget *target);
+        void draw_to_target(RenderTexture2D *target);
 
     public:
         unsigned int get_width() const;
@@ -93,14 +128,15 @@ namespace Tri {
 
     private:
         void set_notification_text(const char *text);
+        void append_notification_text(const char *text);
 
     public:
-        float* get_color();
-        float* get_bg_color();
+        Color& get_color();
+        Color& get_bg_color();
 
-        FilenameBufferType* get_save_filename_buffer();
+        std::array<char, 256>* get_save_filename_buffer();
         bool do_save();
-        std::string_view failed_message() const;
+        const std::string& failed_message() const;
         void close_save();
 
     private:
@@ -113,14 +149,22 @@ namespace Tri {
         void close_bg_color_picker();
 
         bool change_width_height();
-        int* get_input_width_height();
         void close_input_width_height_window();
 
         float get_pi() const;
 
-        float* get_selected_tri_color();
+        Color& get_selected_tri_color();
         void close_selected_tri_mode();
 
+    private:
+        bool check_draw_cache();
+
+    public:
+        int* get_input_width();
+        int* get_input_height();
+
+    private:
+        void restore_points_on_tri_del(Action::IndexT end);
     };
 }
 

src/triangle.cpp

@@ -0,0 +1,63 @@
+#include "triangle.hpp"
+
+Tri::Triangle::Triangle() :
+Shape(),
+vertices{
+    glm::vec2{0.0f, 0.0f},
+    glm::vec2{1.0f, 0.0f},
+    glm::vec2{0.0f, 1.0f}
+}
+{}
+
+Tri::Triangle::Triangle(std::array<glm::vec2, 3> vertices) :
+Shape(),
+vertices(vertices)
+{}
+
+Tri::Triangle::Triangle(std::array<glm::vec2, 3> vertices, Color fillColor) :
+Shape(fillColor),
+vertices(vertices)
+{}
+
+Tri::Triangle::Triangle(std::array<glm::vec2, 3> vertices, Color fillColor, Color outlineColor) :
+Shape(fillColor, outlineColor),
+vertices(vertices)
+{}
+
+Tri::Shape& Tri::Triangle::draw() {
+    std::array<glm::vec2, 3> transformed = {
+        transform * glm::vec3(vertices[0].x, vertices[0].y, 1.0f),
+        transform * glm::vec3(vertices[1].x, vertices[1].y, 1.0f),
+        transform * glm::vec3(vertices[2].x, vertices[2].y, 1.0f)
+    };
+    DrawTriangle(
+        {transformed[0].x, transformed[0].y},
+        {transformed[1].x, transformed[1].y},
+        {transformed[2].x, transformed[2].y},
+        fillColor);
+//    DrawTriangleLines(
+//        {transformed[0].x, transformed[0].y},
+//        {transformed[1].x, transformed[1].y},
+//        {transformed[2].x, transformed[2].y},
+//        outlineColor);
+    return *this;
+}
+
+void Tri::Triangle::getVertices(std::vector<glm::vec2> &verticesOut) const {
+    verticesOut.clear();
+    for(const glm::vec2 &vertex : vertices) {
+        verticesOut.push_back(vertex);
+    }
+}
+
+void Tri::Triangle::getTransformedVertices(std::vector<glm::vec2> &verticesOut) const {
+    verticesOut.clear();
+    for(glm::vec2 vertex : vertices) {
+        vertex = transform * glm::vec3(vertex.x, vertex.y, 1.0f);
+        verticesOut.push_back(vertex);
+    }
+}
+
+float Tri::Triangle::getRadius() const {
+    return 0.0f;
+}

src/triangle.hpp

@@ -0,0 +1,29 @@
+#ifndef TRIANGLES_TRIANGLE_HPP
+#define TRIANGLES_TRIANGLE_HPP
+
+#include <array>
+
+#include "shape.hpp"
+
+namespace Tri {
+
+struct Triangle : public Shape {
+    Triangle();
+    Triangle(std::array<glm::vec2, 3> vertices);
+    Triangle(std::array<glm::vec2, 3> vertices, Color fillColor);
+    Triangle(std::array<glm::vec2, 3> vertices, Color fillColor, Color outlineColor);
+
+    std::array<glm::vec2, 3> vertices;
+
+    virtual Shape& draw() override;
+
+    virtual void getVertices(std::vector<glm::vec2> &verticesOut) const override;
+    virtual void getTransformedVertices(std::vector<glm::vec2> &verticesOut) const override;
+
+    virtual float getRadius() const override;
+    virtual void setRadius(float /* radius */) override {};
+}; // struct Triangle
+
+} // namespace Tri
+
+#endif

src/unittest/test_helpers.cpp

@@ -1,18 +1,73 @@
-#include "catch.hpp"
-
-#include <SFML/Graphics.hpp>
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Weffc++"
+#include "catch_amalgamated.hpp"
+#pragma GCC diagnostic pop
 
 #include "helpers.hpp"
+#include "triangle.hpp"
 
-TEST_CASE("Test is_within_shape", "[Triangles]") {
-    sf::ConvexShape shape;
-    shape.setPointCount(3);
-    shape.setPoint(0, {0.0f, 10.0f});
-    shape.setPoint(1, {10.0f, 10.0f});
-    shape.setPoint(2, {10.0f, 0.0f});
+TEST_CASE("Test is_within_shape", "Helpers") {
+    Tri::Triangle triangle({{
+        {0.0f, 10.0f},
+        {10.0f, 10.0f},
+        {10.0f, 0.0f}
+    }});
 
-    CHECK(Tri::is_within_shape(shape, {2.0f, 2.0f}) == false);
-    CHECK(Tri::is_within_shape(shape, {5.0f, 15.0f}) == false);
-    CHECK(Tri::is_within_shape(shape, {15.0f, 5.0f}) == false);
-    CHECK(Tri::is_within_shape(shape, {7.0f, 7.0f}) == true);
+    CHECK(Tri::is_within_shape(triangle, {2.0f, 2.0f}) == false);
+    CHECK(Tri::is_within_shape(triangle, {5.0f, 15.0f}) == false);
+    CHECK(Tri::is_within_shape(triangle, {15.0f, 5.0f}) == false);
+    CHECK(Tri::is_within_shape(triangle, {7.0f, 7.0f}) == true);
+}
+
+TEST_CASE("Test make_counter_clockwise", "Helpers") {
+    // Note that +x is right and +y is down.
+
+    {
+        // Clockwise triangle.
+        std::array<glm::vec2, 3> tri{{
+            {0.0F, 0.0F}, {1.0F, 0.0F}, {2.0F, 2.0F}
+        }};
+
+        Tri::make_counter_clockwise(tri);
+
+        CHECK(tri.at(0).x == 2.0F);
+        CHECK(tri.at(0).y == 2.0F);
+
+        CHECK(tri.at(1).x == 1.0F);
+        CHECK(tri.at(1).y == 0.0F);
+
+        CHECK(tri.at(2).x == 0.0F);
+        CHECK(tri.at(2).y == 0.0F);
+    }
+
+    {
+        // Counter-Clockwise triangle.
+        std::array<glm::vec2, 3> tri{{
+            {2.0F, 0.0F}, {3.0F, 3.0F}, {4.0F, 1.0F}
+        }};
+
+        Tri::make_counter_clockwise(tri);
+
+        CHECK(tri.at(0).x == 2.0F);
+        CHECK(tri.at(0).y == 0.0F);
+
+        CHECK(tri.at(1).x == 3.0F);
+        CHECK(tri.at(1).y == 3.0F);
+
+        CHECK(tri.at(2).x == 4.0F);
+        CHECK(tri.at(2).y == 1.0F);
+    }
+}
+
+TEST_CASE("Test invert_color", "Helpers") {
+    Color c{
+        255, 255, 255, 255
+    };
+
+    c = Tri::invert_color(c);
+
+    CHECK(c.r == 0);
+    CHECK(c.g == 0);
+    CHECK(c.b == 0);
+    CHECK(c.a == 255);
 }

src/unittest/test_main.cpp

@@ -1,2 +0,0 @@
-#define CATCH_CONFIG_MAIN
-#include "catch.hpp"

third_party/glm

@@ -0,0 +1 @@
+Subproject commit 673a963a0f1eb82f5fcef00b7b873371555e5814

third_party/imgui

@@ -1 +0,0 @@
-Subproject commit 9418dcb69355558f70de260483424412c5ca2fce

third_party/imgui-sfml

@@ -1 +0,0 @@
-Subproject commit 488c321155547cb499697dac155aa6269d53c21f

third_party/raygui

@@ -0,0 +1 @@
+Subproject commit 25c8c65a6e5f0f4d4b564a0343861898c6f2778b