/***********************************************
* JuliazoomGen2.c
*
*  Generates a RAW format file of an image 
*  of a Generalized Julia set (grayscale)
*
*  C source file by Alberto Strumia
*
************************************************/



#include<stdio.h>

/* definition of constants */

#define Radius 10
#define Cx 1.05
#define Cy 0.2109
#define Side 1.4
#define M 700
#define Num 512
/* alternative values x0 = 0, y0 = 0, Side 0.3, Num 1024; x0 = -0.15, y0 = 0.07, 0.1, Num 1024 */

/* main program */
main()
{

	int p, q, n, w;
	double x, y, xx, yy, Incx, Incy;
	
	
	FILE *fp;
	fp = fopen("Julia.raw","w");
		
	for (p = 1; p <= M; p++)
	{
		Incy = - Side + 2*Side/M*p;
	
			printf("%i %%\n", p*100/M);
		
		for (q = 1; q <= M; q++)
		{
			Incx = - Side + 2*Side/M*q;
			
		x =  Incx;
		y =  Incy;
		w = 200;
			
			for ( n = 1; n <= Num; ++n)
			{
				xx = (x*x - y*y)*(x*x - y*y) - 4*x*x*y*y - Cx;
				yy = 4*x*y*(x*x - y*y) - Cy;
				
				x = xx;
				y = yy;
				
				if ( x*x + y*y > Radius )
					{
						w = n;
						n = Num;
					}
			}
		fprintf(fp, "%c", w/2 );
		}
	}
	
	fclose(fp);
}

/* end of main program */