如何在SDL_Renderer中移动单个元素？

#include <SDL.h>

int main(int argc, char* argv[]) {
    SDL_Init(SDL_INIT_VIDEO);

    SDL_Window* window = SDL_CreateWindow("Moving Element", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

    SDL_Surface* surface = SDL_LoadBMP("element.bmp");
    SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, surface);
    SDL_FreeSurface(surface);

    SDL_Rect elementRect;
    elementRect.x = 100;
    elementRect.y = 100;
    elementRect.w = 50;
    elementRect.h = 50;

    bool quit = false;
    SDL_Event event;

    while (!quit) {
        while (SDL_PollEvent(&event) != 0) {
            if (event.type == SDL_QUIT) {
                quit = true;
            }
        }

        SDL_RenderClear(renderer);
        SDL_RenderCopy(renderer, texture, NULL, &elementRect);
        SDL_RenderPresent(renderer);

        // 移动元素
        elementRect.x += 1;
        elementRect.y += 1;
    }

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

    return 0;
}