C/C++ Mandelbrot Set with SDL2 Library

[ron77]

#include "SDL2/SDL.h"
#include <windows.h>
#include <math.h>


int WIDTH = 800;
int HIEGHT = 800;

long double min = -2.84;
long double max = 1.0;
long double factor = 1;

int MAX_ITERATIONS = 200;

long double map( long double value, long double in_min, long double in_max, long double out_min, long double out_max ) {
	return (value - in_min) * (out_max -out_min) /(in_max-in_min) + out_min;
}


int main( int argc, char* argv[] ) {
	
	SDL_Init( SDL_INIT_EVERYTHING );
	
	SDL_Window* window;
	SDL_Renderer* renderer;
	SDL_Event event;
	
	
	SDL_CreateWindowAndRenderer( 1440, 900, 0, &window, &renderer );
	SDL_RenderSetLogicalSize( renderer, WIDTH, HIEGHT );
	
	int count = 0;
	
	while (1) {
		
		max -= 0.1 * factor;
		min += 0.15 * factor;
		factor *= 0.9349;
		MAX_ITERATIONS += 5;
		
		if (count > 30) {
			MAX_ITERATIONS *= 1.02;
		}
		
		SDL_RenderPresent(renderer);
		
		for (int x = 0; x <WIDTH; x++) {
			
			if (SDL_PollEvent(&event) && event.type == SDL_QUIT) {
				return 0;
			}
			if (GetKeyState('Q') && 0x8000) {
				return 0;
			}
			
			for (int y = 0; y < HIEGHT; y++) {
				
				long double a = map( x, 0 , WIDTH, min, max);
				
				long double b = map( y , 0 , HIEGHT, min, max);
				
				long double ai = a;
				
				long double bi = b;
				
				int n = 0;
				
				for (int i = 0 ; i < MAX_ITERATIONS; i++) {
					
					long double a1 = a * a - b * b;
					
					long double b1 = 2 * a * b;
					
					a = a1 + ai;
					b = b1 + bi;
					
					if ((a+ b) > 2) {
						break;
					}
					
					
					
					n++;
				}
				
				int bright = map(n, 0 ,MAX_ITERATIONS, 0, 255);
				
				if ((n == MAX_ITERATIONS) || (bright < 20 ) ) {
					bright = 0;
				}
				
				int red = map(bright * bright, 0, 6502, 0, 255);
				int green = bright;
				int blue = map(sqrt( bright), 0, sqrt(bright), 0, 255);
				
				
				SDL_SetRenderDrawColor( renderer, red, green, blue, 255 );
				SDL_RenderDrawPoint( renderer, x, y );
			}
			
		}
		
		count++;
	}
	
	return 0;
}

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