Activities switch with numbers and display indeces.

main.c

@@ -312,10 +312,22 @@ int main(int argc, char *argv[])
 
         state.mouse_pos = GetMousePosition();
 
-        // TODO: Switch activities with number keys.
         if(IsKeyPressed(KEY_Q))
             break;
 
+        for(U32 i = 0; i < activity_type_COUNT; i++) {
+            if(IsKeyPressed(KEY_ONE + i)) {
+                current_activity++;
+
+                activities[current_activity].type = i;
+                activities[current_activity].color =
+                            activity_type_color_representation[i];
+                activities[current_activity].began = now_s;
+                activities[current_activity].ended = now_s;
+            }
+
+        }
+
         activities[current_activity].ended = now_s;
 
         BeginDrawing();
@@ -374,6 +386,12 @@ int main(int argc, char *argv[])
                 }
                 if(activities[current_activity].type == i)
                     DrawRectangleRoundedLinesEx(rect, 0.2f, 100, 5.0f, WHITE);
+
+                char index_buf[8];
+                snprintf(index_buf, sizeof(index_buf), "%d", i + 1);
+                DrawTextEx(state.font, index_buf,
+                           (Vector2){ rect.x + 10.0f, rect.y + 10.0f },
+                           font_size - 5.0f, 2, BLACK);
             }
         EndDrawing();