Impl changing background color, with "B"

src/imgui_helper.hpp

@@ -28,6 +28,7 @@ namespace Tri {
             ImGui::Text("Press \"U\" to undo. Clicking will remove all future undo history");
             ImGui::Text("Press \"R\" to undo.");
             ImGui::Text("Press \"C\" to change colors");
+            ImGui::Text("Press \"B\" to change background color");
             ImGui::End();
         }
     }
@@ -54,11 +55,19 @@ namespace Tri {
 
     inline void draw_color_picker(Tri::State *state) {
         if(state->get_flags().test(2)) {
-            ImGui::Begin("Color Picker");
+            ImGui::Begin("Tri Color Picker");
             ImGui::ColorPicker4("Tri Color", state->get_color());
             ImGui::End();
         }
     }
+
+    inline void draw_bg_color_picker(Tri::State *state) {
+        if(state->get_flags().test(5)) {
+            ImGui::Begin("BG Color Picker");
+            ImGui::ColorPicker3("BG Color", state->get_bg_color());
+            ImGui::End();
+        }
+    }
 }
 
 #endif

src/state.cpp

@@ -22,7 +22,9 @@ window(sf::VideoMode(800, 600), "Triangles", sf::Style::Titlebar | sf::Style::Cl
 trisIndex(0),
 currentTri_state(CurrentState::NONE),
 currentTri_maxState(CurrentState::NONE),
-colorPickerColor{1.0f, 1.0f, 1.0f, 1.0f}
+colorPickerColor{1.0f, 1.0f, 1.0f, 1.0f},
+bgColorPickerColor{0.0f, 0.0f, 0.0f},
+bgColor(sf::Color::Black)
 {
     flags.set(1); // is running
     ImGui::SFML::Init(window);
@@ -96,9 +98,11 @@ void Tri::State::handle_events() {
                 }
             } else if(event.key.code == sf::Keyboard::C) {
                 flags.flip(2);
+            } else if(event.key.code == sf::Keyboard::B) {
+                flags.flip(5);
             }
         } else if(event.type == sf::Event::MouseButtonPressed) {
-            if(!flags.test(2)) {
+            if(!flags.test(2) && !flags.test(5)) {
                 switch(currentTri_state) {
                 case CurrentState::NONE:
                     currentTri[0] = sf::Vector2f(event.mouseButton.x, event.mouseButton.y);
@@ -155,16 +159,24 @@ void Tri::State::update() {
             (unsigned char)(255 * colorPickerColor[3])));
     }
 
+    if(flags.test(4)) {
+        flags.reset(4);
+        bgColor.r = (unsigned char)(255 * bgColorPickerColor[0]);
+        bgColor.g = (unsigned char)(255 * bgColorPickerColor[1]);
+        bgColor.b = (unsigned char)(255 * bgColorPickerColor[2]);
+    }
+
     // Seems misleading, but imgui handles setting up the window during update
     Tri::draw_show_help(this);
     Tri::draw_color_picker(this);
+    Tri::draw_bg_color_picker(this);
     Tri::draw_help(this);
 
     ImGui::EndFrame();
 }
 
 void Tri::State::draw() {
-    window.clear();
+    window.clear(bgColor);
 
     // draw tris
     for(unsigned int i = 0; i < trisIndex; ++i) {
@@ -203,3 +215,8 @@ float* Tri::State::get_color() {
     flags.set(3);
     return colorPickerColor;
 }
+
+float* Tri::State::get_bg_color() {
+    flags.set(4);
+    return bgColorPickerColor;
+}

src/state.hpp

@@ -20,6 +20,8 @@ namespace Tri {
          * 1 - is running
          * 2 - display color picker
          * 3 - color picker color dirty
+         * 4 - bg color picker color dirty
+         * 5 - display bg color picker
          */
         typedef std::bitset<64> BitsetType;
         BitsetType flags;
@@ -39,6 +41,8 @@ namespace Tri {
         sf::Event event;
 
         float colorPickerColor[4];
+        float bgColorPickerColor[3];
+        sf::Color bgColor;
 
     public:
         void handle_events();
@@ -53,6 +57,7 @@ namespace Tri {
         float get_starting_help_alpha() const;
 
         float* get_color();
+        float* get_bg_color();
     };
 }