85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
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#include <SDL2/SDL.h>
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#include <SDL2/SDL_error.h>
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#include <SDL2/SDL_events.h>
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#include <SDL2/SDL_rect.h>
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#include <SDL2/SDL_render.h>
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#include <SDL2/SDL_video.h>
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#include <unistd.h>
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#define WIDTH 1920
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#define HEIGHT 1200
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#define BALLSIZE 50
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SDL_Window *win;
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SDL_Renderer *ren;
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struct {
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int x, y;
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float dx, dy;
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} ballPos = {10, 10, 3, 2};
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void* cpv(void * v, const char *msg){
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if( v == 0 ){
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fprintf(stderr, "%s -> %s\n",msg, SDL_GetError());
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exit(1);
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}
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return v;
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}
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int civ(int v, const char *msg){
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if( v != 0 ){
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fprintf(stderr, "%s -> %s\n",msg, SDL_GetError());
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exit(1);
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}
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return v;
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}
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void ballMove(){
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if(ballPos.x <=0 || ballPos.x >= WIDTH - BALLSIZE){
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ballPos.dx = ballPos.dx * -1;
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ballPos.dy = (ballPos.dy / abs(ballPos.dy)) * ((rand() % 5) + 1);
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}
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if(ballPos.y <=0 || ballPos.y >= HEIGHT - BALLSIZE){
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ballPos.dy = ballPos.dy * -1;
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ballPos.dx = (ballPos.dx / abs(ballPos.dx)) * ((rand() % 5) + 1);
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}
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ballPos.x = ballPos.x + ballPos.dx;
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ballPos.y = ballPos.y + ballPos.dy;
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}
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int main()
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{
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civ(SDL_Init(SDL_INIT_VIDEO), "can't init SDL");
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win = cpv(SDL_CreateWindow("pong", 0, 0, WIDTH, HEIGHT, SDL_WINDOW_SHOWN), "can't create window");
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ren = cpv(SDL_CreateRenderer(win, -1, SDL_RENDERER_SOFTWARE), "can't create renderer");
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int i = 0;
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SDL_RenderClear(ren);
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SDL_bool should_close = SDL_FALSE;
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SDL_Event e;
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while(!should_close){
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while(SDL_PollEvent(&e)){
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if(e.type == SDL_QUIT){
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should_close = SDL_TRUE;
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}
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}
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/* SDL_SetRenderDrawColor(ren, 0, 0, 0, 255); */
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/* SDL_RenderClear(ren); */
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ballMove();
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SDL_SetRenderDrawColor(ren, (sin((double)i/20) + 1) * 128, (cos((double)i/10) + 1) * 128, (sin((double)i/50) + 1) * 128, 255);
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SDL_Rect ball = {ballPos.x, ballPos.y, BALLSIZE, BALLSIZE};
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SDL_RenderFillRect(ren, &ball);
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SDL_RenderPresent(ren);
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i++;
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}
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return 0;
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}
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