mirror of
https://github.com/libretro/cpp-cheat.git
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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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Random walk.
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*/
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#include "common.h"
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#define WINDOW_WIDTH 600
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#define RECT_WIDTH (WINDOW_WIDTH / 30)
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#define MAX_RECT_POS (WINDOW_WIDTH - RECT_WIDTH)
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#define SCREENS_PER_SECOND 10.0
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double rand_one() {
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return -1.0 + 2.0 * (rand() / (double)RAND_MAX);
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}
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double get_coord(double *x, double magnitude) {
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*x += magnitude * rand_one();
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*x = fmod(*x, MAX_RECT_POS);
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if (*x < 0)
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*x = MAX_RECT_POS;
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return *x;
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}
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int main(void) {
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SDL_Event event;
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SDL_Rect rect;
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SDL_Renderer *renderer;
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SDL_Window *window;
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double x, y, magnitude;
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unsigned int current_time, last_time;
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srand(time(NULL));
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SDL_Init(SDL_INIT_TIMER | SDL_INIT_VIDEO);
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SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);
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rect.x = WINDOW_WIDTH / 2;
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rect.y = WINDOW_WIDTH / 2;
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rect.w = RECT_WIDTH;
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rect.h = RECT_WIDTH;
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last_time = SDL_GetTicks();
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common_fps_init();
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while (1) {
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if (SDL_PollEvent(&event) && event.type == SDL_QUIT)
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break;
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current_time = SDL_GetTicks();
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if (current_time != last_time) {
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magnitude = SCREENS_PER_SECOND * MAX_RECT_POS * (current_time - last_time) / 1000.0;
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rect.x = get_coord(&x, magnitude);
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rect.y = get_coord(&y, magnitude);
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last_time = current_time;
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
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SDL_RenderClear(renderer);
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SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
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SDL_RenderFillRect(renderer, &rect);
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SDL_RenderPresent(renderer);
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}
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common_fps_update_and_print();
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}
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return EXIT_SUCCESS;
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}
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