linux下跟踪鼠标的小游戏

#include <SDL2/SDL.h>
#include <stdio.h>

const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

int main(int argc, char* args[]) {
    SDL_Window* window = NULL;
    SDL_Renderer* renderer = NULL;

    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        printf("SDL could not initialize! SDL_Error: %s\n", SDL_GetError());
        return 1;
    }

    window = SDL_CreateWindow("Mouse Tracker", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
    if (window == NULL) {
        printf("Window could not be created! SDL_Error: %s\n", SDL_GetError());
        return 1;
    }

    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
    if (renderer == NULL) {
        printf("Renderer could not be created! SDL_Error: %s\n", SDL_GetError());
        return 1;
    }

    SDL_Event e;
    int quit = 0;
    while (!quit) {
        while (SDL_PollEvent(&e) != 0) {
            if (e.type == SDL_QUIT) {
                quit = 1;
            }
        }

        int x, y;
        Uint32 buttons = SDL_GetMouseState(&x, &y);

        SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
        SDL_RenderClear(renderer);

        SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF);
        SDL_Rect circleRect = { x - 10, y - 10, 20, 20 };
        for (int w = 0; w < circleRect.w * 2; w++) {
            for (int h = 0; h < circleRect.h * 2; h++) {
                int dx = circleRect.x + w - circleRect.w;
                int dy = circleRect.y + h - circleRect.h;
                if ((dx*dx + dy*dy) <= (circleRect.w * circleRect.w)) {
                    SDL_RenderDrawPoint(renderer, dx + circleRect.w, dy + circleRect.h);
                }
            }
        }

        SDL_RenderPresent(renderer);
        SDL_Delay(16); // ~60 FPS
    }

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}

gcc -o mouse_tracker mouse_tracker.c -lSDL2
./mouse_tracker