added screen transitions (C goofy function pointer syntax...)

minesweeper/mine.c

@@ -46,6 +46,19 @@ cell* clicked_cell(Minefield* mf, int x, int y);
 void expose_cell(Minefield* mf, int r, int c);
 void handle_click(Minefield* mf);
 
+typedef enum screens {
+    GAME_LOOP,
+    GAME_OVER,
+    HELP,
+} Screen;
+
+Screen game_loop(Minefield* mf);
+/* Screen game_over(Minefield* mf); */
+Screen help_screen(Minefield* mf);
+
+Screen (*screen_fn(Screen scr))(Minefield *);
+Screen last_screen;
+
 const int screenWidth = 800;
 const int screenHeight = 450;
 float cell_size;
@@ -67,16 +80,11 @@ int main(){
     InitWindow(screenWidth, screenHeight, "Minesweeper");
     SetTargetFPS(60);
 
+    Screen screen = GAME_LOOP;
+    Screen (*loop)(Minefield*);
     while(!WindowShouldClose()){
-
-        if (!dead){
-            handle_click(&mf);
-        }
-
-        BeginDrawing();
-        ClearBackground(RAYWHITE);
-        draw_minefield(&mf);
-        EndDrawing();
+        loop = screen_fn(screen);
+        screen = (*loop)(&mf);
     }
 
     free_minefield(&mf);
@@ -84,6 +92,51 @@ int main(){
     return 0;
 }
 
+Screen game_loop(Minefield* mf){
+    while(!WindowShouldClose()){
+
+        if (IsKeyPressed(KEY_H)){
+            break;
+        }
+
+        if (!dead){
+            handle_click(mf);
+        }
+
+        BeginDrawing();
+        ClearBackground(RAYWHITE);
+        draw_minefield(mf);
+        EndDrawing();
+    }
+    last_screen = GAME_LOOP;
+    return HELP;
+}
+
+Screen help_screen(Minefield* mf){
+    while(!WindowShouldClose() && IsKeyDown(KEY_H)){
+
+        BeginDrawing();
+        ClearBackground(RAYWHITE);
+        DrawText("Left Mouse Click - Open tile.", 100, 100, 30, BLACK);
+        DrawText("Right Mouse Click - Mark tile.", 100, 150, 30, BLACK);
+        EndDrawing();
+    }
+    return last_screen;
+}
+
+Screen (*screen_fn(Screen scr))(Minefield *) {
+  switch (scr) {
+  case GAME_LOOP:
+    return game_loop;
+  /* case GAME_OVER: */
+  /*     return game_loop; */
+  case HELP:
+    return help_screen;
+  default:
+    return game_loop;
+  }
+}
+
 Minefield make_minefield(int row, int col, int mine_count){
     Minefield mf = {.row = row, .col = col};
     int size = mf.row * mf.col;
@@ -173,7 +226,7 @@ void draw_minefield(Minefield* mf){
     }
     char time_str[20];
     float time = GetTime();
-    snprintf(time_str, 100, "%02d.%02d - %d/%d",
+    snprintf(time_str, 20, "%02d.%02d - %d/%d",
              (int) time / 60, (int) time % 60,
              mark_count, mf->mine_count);
     DrawText(time_str, screenWidth / 2 - 20, screenHeight - 30, 20, BLACK);