用于绘制实心圆的SDL2函数

int SDL_RenderFillCircle(SDL_Renderer* renderer, int x, int y, int radius);

#include <SDL2/SDL.h>

int main() {
    SDL_Init(SDL_INIT_VIDEO);
    SDL_Window* window = SDL_CreateWindow("SDL2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);
    
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255); // 设置绘制颜色为红色
    
    SDL_RenderClear(renderer); // 清空渲染器
    
    SDL_RenderFillCircle(renderer, 400, 300, 100); // 绘制实心圆，中心坐标为(400, 300)，半径为100
    
    SDL_RenderPresent(renderer); // 更新屏幕显示
    
    SDL_Delay(2000); // 延时2秒
    
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    
    return 0;
}