### Just like a simple raylib app. ```c /* Includes not shown */ #define ZERO 0 #define REC_SIZE 50 #define REC_PADDING REC_SIZE - 1 #define STEP_SIZE 2 void x_y_move_bounds(); int x,y,toggle_x,toggle_y,screen_size_x,screen_size_y; int main() { sos_io_init(); Color color; color.r = 20; color.g = 20; color.b = 20; color.a = 255; screen_size_x = GetScreenWidth(); screen_size_y = GetScreenHeight(); x = screen_size_x / 2; y = screen_size_y / 2; toggle_x = STEP_SIZE; toggle_y = STEP_SIZE; while(1) { BeginDrawing(); ClearBackground(color); DrawRectangle(x, y, REC_SIZE, REC_SIZE, (Color){30,30,180,255}); EndDrawing(); x_y_move_bounds(); } return 0; } void x_y_move_bounds() { if( (x>(screen_size_x - REC_PADDING)) || (x < ZERO) ) toggle_x = toggle_x * (-1); if( (y>(screen_size_y - REC_PADDING)) || (y < ZERO) ) toggle_y = toggle_y * (-1); x += toggle_x; y += toggle_y; } ```

### Just like a simple raylib app. ```c /* Includes not shown */ #define ZERO 0 #define REC_SIZE 50 #define REC_PADDING REC_SIZE - 1 #define STEP_SIZE 2 void x_y_move_bounds(); int x,y,toggle_x,toggle_y,screen_size_x,screen_size_y; int main() { sos_io_init(); Color color; color.r = 20; color.g = 20; color.b = 20; color.a = 255; screen_size_x = GetScreenWidth(); screen_size_y = GetScreenHeight(); x = screen_size_x / 2; y = screen_size_y / 2; toggle_x = STEP_SIZE; toggle_y = STEP_SIZE; while(1) { BeginDrawing(); ClearBackground(color); DrawRectangle(x, y, REC_SIZE, REC_SIZE, (Color){30,30,180,255}); EndDrawing(); x_y_move_bounds(); } return 0; } void x_y_move_bounds() { if( (x>(screen_size_x - REC_PADDING)) || (x < ZERO) ) toggle_x = toggle_x * (-1); if( (y>(screen_size_y - REC_PADDING)) || (y < ZERO) ) toggle_y = toggle_y * (-1); x += toggle_x; y += toggle_y; } ```