SDL2 无法正确绘制矩形

SDL2 Wont draw Rectangles Correctly

本文关键字：绘制 SDL2      更新时间：2023-10-16

我正在创建一个窗口并绘制一个框，但由于某种原因，屏幕只是更改为该颜色，而不是绘制一个框。我附上了一张窗口外观的照片，我将附上源代码。

#include <iostream>
#include <SDL.h>
#undef main
using namespace std;
int SCREEN_WIDTH = 650;
int SCREEN_HEIGHT = 650;
int main() {
if (SDL_Init(SDL_INIT_VIDEO) != 0) {
std::cout << "SDL_Init Error: " << SDL_GetError() << std::endl;
return 1;
}
SDL_Window *window = SDL_CreateWindow("Cells", 100, 100, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
if (window == nullptr) {
std::cout << "SDL_CreateWindow Error: " << SDL_GetError() << std::endl;
SDL_Quit();
return 1;
}
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if (renderer == nullptr) {
std::cout << "SDL_CreateRenderer Error: " << SDL_GetError() << std::endl;
SDL_DestroyWindow(window);
SDL_Quit();
return 1;
}
SDL_Event event;
bool quit = false;
while (!quit) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
quit = true;
}
}
SDL_RenderClear(renderer);
// renderTextures
SDL_Rect fillRect = { 122, 122, 122, 122};
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderFillRect(renderer, &fillRect);
SDL_RenderPresent(renderer);
}
return 0;
}

绘制不正确

SDL_RenderClear使用您修改的当前绘制颜色，因此您的透明和矩形颜色是相同的。设置不同的清晰颜色(您想要的背景颜色，没有绘制其他颜色(，例如

SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
// now draw your rectangles with different col
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