chaos.cpp

#include <SDL.h>
#include <iostream>

SDL_Window *win;
SDL_Renderer *ren;
SDL_Event e;

#define RES_X 1920
#define RES_Y 1080

int createWindow() {

	win = SDL_CreateWindow("Chaos", 100, 100, RES_X, RES_Y, SDL_WINDOW_SHOWN);
	if (win == nullptr){
		std::cout << "SDL_CreateWindow Error: " << SDL_GetError() << std::endl;
		SDL_Quit();
		return 1;
	}

	SDL_SetWindowFullscreen(win, SDL_WINDOW_FULLSCREEN);

	ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC );
	if (ren == nullptr){
		SDL_DestroyWindow(win);
		std::cout << "SDL_CreateRenderer Error: " << SDL_GetError() << std::endl;
		SDL_Quit();
		return 2;
	}

	return 0;

}


int startSdl() {
	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
		std::cout << "SDL_Init Error: " << SDL_GetError() << std::endl;
		return 1;
	}
	return 0;
}

int loop() {

	for (int tint=1000; tint<20000; tint++) {
		double t = tint/20000.0;
		
		while (SDL_PollEvent(&e)){
			//If user closes the window
			if (e.type == SDL_QUIT){
				return 1;
			}
			//If user presses any key
			if (e.type == SDL_KEYDOWN){
				return 1;
			}
			//If user clicks the mouse
			if (e.type == SDL_MOUSEBUTTONDOWN){
				return 1;
			}
		}
		
		SDL_SetRenderDrawColor(ren, 0, 0, 0, 255);
		SDL_RenderClear(ren);

		double x = t;
		double y = t;
		for (int points=0; points<10000; points++) {
			SDL_SetRenderDrawColor(ren, 256-points % 256, points % 256, 256-points % 256, 100);
			double tmp = x*x - x*t + y*t - x;
			y = -y*y - t*t - x*y - x*t - y*t -y;
			x = tmp;
			SDL_RenderDrawPoint(
				ren,
				RES_X/2 + x*RES_Y/3,
				RES_Y/2 + y*RES_Y/3
				);
		}
		SDL_RenderPresent(ren);
		SDL_Delay(1);
	}
}

int main(int argc, char const *argv[])
{
	if (startSdl() != 0) return 1;
	if (createWindow() != 0) return 2;
	std::cout << "Start " << std::endl;
	loop();
	SDL_DestroyRenderer(ren);
	SDL_DestroyWindow(win);
	SDL_Quit();
	return 0;
}