用到的APISDL_SetRenderDrawColor(SDL_Renderer* renderer, Uint8 r, Uint8 g, Uint8 b, Uint8 a)API介绍SDL_Rect 介绍
SDL_Rect 是一个结构体，其中有四个int型的成员，x,y,w,h x,y 为坐标， w,h 为宽和高 SDL中的x，y坐标系如图片所示
代码SCREEN_H 600int main(int argc, char **argv) {SDL_Window *pWindow = NULL;SDL_Renderer *pRenderer = NULL;SDL_Init(SDL_INIT_EVERYTHING);pWindow = SDL_CreateWindow(“Geometry Rendering”,SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED,SCREEN_W,SCREEN_H,SDL_WINDOW_OPENGL);pRenderer = SDL_CreateRenderer(pWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);bool quit = false;SDL_Event e;while( !quit ) {while( SDL_PollEvent(&e) != 0 ) {if(e.type == SDL_QUIT)quit = true;}SDL_SetRenderDrawColor(pRenderer,0xFF,0xFF,0xFF,0xFF);SDL_RenderClear(pRenderer);SDL_Rect fillRect = {SCREEN_W / 4, SCREEN_H / 4, SCREEN_W / 2, SCREEN_H / 2};SDL_SetRenderDrawColor(pRenderer, 0xFF, 0x00, 0x00, 0xFF);SDL_RenderFillRect(pRenderer, &fillRect);//填充矩形SDL_Rect outlineRect = {SCREEN_W / 6, SCREEN_H / 6, SCREEN_W * 2 / 3, SCREEN_H * 2 / 3};SDL_SetRenderDrawColor(pRenderer,0x00,0xFF,0x00,0xFF);SDL_RenderDrawRect(pRenderer,&outlineRect);//绘制矩形边框SDL_SetRenderDrawColor(pRenderer,0x00,0x00,0xFF,0xFF);SDL_RenderDrawLine(pRenderer,SCREEN_W * 4 / 5,SCREEN_H * 4 / 5,SCREEN_W * 1 / 5,SCREEN_H * 1 / 5); //绘制线段SDL_SetRenderDrawColor(pRenderer,0xFF,0xFF,0x00,0xFF);for(int i = 0; i <= SCREEN_H; i += 10) {SDL_RenderDrawPoint(pRenderer, SCREEN_W / 2, i); //绘制点}SDL_RenderPresent(pRenderer);}SDL_DestroyWindow(pWindow);SDL_DestroyRenderer(pRenderer);SDL_Quit();return 0;}效果
，比天才难得，许多天赋差的人经过过勤学苦练也取得了很大的成功。
