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iterations.c
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iterations.c
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// https://experiences.math.cnrs.fr/Iterations-de-l-application.html
#include <stdlib.h>
#include <math.h>
#include <SDL2/SDL.h>
#define SIZE 256
#define FPS 30
int main(int argc, char **argv) {
const int frameDelay = 1000 / FPS;
Uint32 frameStart, frameTime;
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *window=SDL_CreateWindow("iterations", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, SIZE, SIZE, SDL_WINDOW_OPENGL);
SDL_Renderer *renderer=SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
SDL_Rect canvas={0, 0, SIZE, SIZE};
SDL_bool isRunning = SDL_TRUE;
SDL_Event event;
float i=0.2, r=3.7;
int x0=0, y0=SIZE/2, x=0, y=0;
while(isRunning) {
frameStart=SDL_GetTicks();
while(SDL_PollEvent(&event))
if (event.type==SDL_QUIT || event.type==SDL_KEYDOWN) isRunning=SDL_FALSE;
SDL_SetRenderDrawColor(renderer, 30, 30, 35, 10);
SDL_RenderFillRect(renderer, &canvas);
SDL_SetRenderDrawColor(renderer, 0, 255, 255, SDL_ALPHA_OPAQUE);
x+=4;
if (x>=SIZE) {
x=x0=0;
SDL_SetRenderDrawColor(renderer, 30, 30, 35, 192);
SDL_RenderFillRect(renderer, &canvas);
SDL_SetRenderDrawColor(renderer, 0, 255, 255, SDL_ALPHA_OPAQUE);
}
i=r*i*(1.0-i);
y=i*SIZE/2 + SIZE/5;
SDL_RenderDrawLine(renderer, x0, y0, x, y);
x0=x;
y0=y;
frameTime = SDL_GetTicks() - frameStart;
if (frameDelay > frameTime) SDL_Delay(frameDelay - frameTime);
SDL_RenderPresent(renderer);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
exit(EXIT_SUCCESS);
}