Working text drawing and accepting based on input

.gitignore

@@ -1,2 +1,4 @@
 /dvorak_typing_practice
 /objects/
+/.cache/
+/compile_commands.json

Makefile

@@ -6,7 +6,8 @@ endif
 
 OBJDIR = objects
 
-SOURCES = src/main.cc
+SOURCES = src/main.cc \
+		src/screen.cc
 
 OBJECTS = $(addprefix ${OBJDIR}/,$(subst .cc,.o,${SOURCES}))
 

src/main.cc

@@ -1,10 +1,18 @@
+// Standard library includes
 #include <string>
 #include <iostream>
+#include <fstream>
 
-std::string get_next_word() {
+// Third party includes
+#include <raylib.h>
+
+// Local includes
+#include "screen.h"
+
+std::string get_next_word(std::istream *i) {
     std::string word;
-    while (std::cin.good()) {
-        int in = std::cin.get();
+    while (i->good()) {
+        int in = i->get();
         if (in != std::char_traits<char>::eof() && in != ' ' && in != '\n' && in != '\r') {
             word.push_back((char)in);
         } else if (in == ' '|| in == '\n' || in == '\r' || in == '\t') {
@@ -15,15 +23,41 @@ std::string get_next_word() {
     return word;
 }
 
-int main() {
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        std::cout << "Expected 1 arg input filename!\n";
+        return 1;
+    }
+
+    std::ifstream ifs(argv[1]);
+
+    if (!ifs.good()) {
+        std::cout << "ERROR: Failed to open file \"" << argv[1] << "\"!\n";
+        return 2;
+    }
+
+    InitWindow(900, 400, "Dvorak Typing Practice");
+    SetTargetFPS(15);
+
+    {
+        Screen screen{};
+
         std::string word;
 
         do {
-        word = get_next_word();
+            word = get_next_word(&ifs);
             if (!word.empty()) {
-            std::cout << word << '\n';
+                screen.set_word(word);
+                while (!screen.update() && !WindowShouldClose()) {
+                    BeginDrawing();
+                    ClearBackground(BLACK);
+                    screen.draw();
+                    EndDrawing();
+                }
+            }
+        } while (!std::cin.eof() && !WindowShouldClose());
     }
-    } while (!std::cin.eof());
 
+    CloseWindow();
     return 0;
 }

src/screen.cc

@@ -0,0 +1,78 @@
+#include "screen.h"
+#include <raylib.h>
+
+Screen::Screen() :
+prev(),
+word(),
+word_center{0, 0},
+keyboard(LoadTexture("dvorak_keyboard.png")),
+idx(0)
+{
+    flags.set(0);
+}
+
+Screen::~Screen() {
+    UnloadTexture(keyboard);
+}
+
+void Screen::set_word(std::string s) {
+    prev = word;
+    word = s;
+    idx = 0;
+    word_pre.clear();
+    word_post.clear();
+    word_center[0] = s.at(0);
+    flags.set(0);
+}
+
+bool Screen::update() {
+    int input = GetCharPressed();
+    if (input == word_center[0]) {
+        ++idx;
+        flags.set(0);
+        if (idx >= word.size()) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void Screen::draw() {
+    DrawTexture(keyboard, 0, 0, WHITE);
+    if (flags.test(0)) {
+        flags.reset(0);
+
+        if (idx > 0) {
+            word_pre = word.substr(0, idx);
+        } else {
+            word_pre.clear();
+        }
+
+        if (idx < word.size()) {
+            word_post = word.substr(idx + 1, word.size() - idx - 1);
+        } else {
+            word_post.clear();
+        }
+
+        word_center[0] = word.at(idx);
+    }
+
+    int offset = 0;
+    if (!prev.empty()) {
+        DrawText(prev.c_str(), LEFT_OFFSET + offset, TOP_OFFSET, FONT_SIZE, Color{127, 127, 127, 255});
+        offset += MeasureText(prev.c_str(), FONT_SIZE) + PREV_OFFSET;
+    }
+
+    if (!word_pre.empty()) {
+        DrawText(word_pre.c_str(), LEFT_OFFSET + offset, TOP_OFFSET, FONT_SIZE, WHITE);
+        offset += MeasureText(word_pre.c_str(), FONT_SIZE) + CENTER_X_OFFSET;
+    }
+
+    DrawText(word_center.data(), LEFT_OFFSET + offset, TOP_OFFSET, FONT_SIZE, GREEN);
+    offset += MeasureText(word_center.data(), FONT_SIZE) + CENTER_X_OFFSET;
+
+    if (!word_post.empty()) {
+        DrawText(word_post.c_str(), LEFT_OFFSET + offset, TOP_OFFSET, FONT_SIZE, WHITE);
+    }
+}

src/screen.h

@@ -0,0 +1,45 @@
+#ifndef DVORAK_TYPING_PRACTICE_SCREEN_H_
+#define DVORAK_TYPING_PRACTICE_SCREEN_H_
+
+// Standard library includes
+#include <array>
+#include <bitset>
+#include <string>
+
+// Third party includes
+#include <raylib.h>
+
+// Constants
+constexpr int LEFT_OFFSET = 20;
+constexpr int TOP_OFFSET = 320;
+constexpr int FONT_SIZE = 40;
+constexpr int CENTER_X_OFFSET = FONT_SIZE / 2;
+constexpr int PREV_OFFSET = FONT_SIZE * 2;
+
+class Screen {
+public:
+    Screen();
+    ~Screen();
+
+    void set_word(std::string s);
+
+    // True if finished with word.
+    bool update();
+    void draw();
+
+private:
+    std::string prev;
+    std::string word;
+    std::string word_pre;
+    std::string word_post;
+    std::array<char, 2> word_center;
+    Texture2D keyboard;
+    unsigned int idx;
+    /*
+     * 0 - cached word data is dirty
+     */
+    std::bitset<32> flags;
+
+};
+
+#endif