/***********************************************
*	Mand3DintGen2.c
*
*  Generates a RAW format file of a 3D image 
*  of Mandelbrot set (grayscale)
*
*  C source file by Alberto Strumia
*
************************************************/


#include<stdio.h>	

/* definition of constants */
#define Radius 10
#define Side 0.05		
#define Cx 1.24 - 2.0*Side
#define Cy 1.3*Side	
#define M 700	
#define Num 255	
#define co 1.41		
#define si 1.41	

/* main program */
main()
{

	int p, q, n, wext, wint, r[M];	
	double x, y, xx, yy, Incx, Incy, md;
	

	FILE *fp;
	fp = fopen("Mand.raw","w");	

	for (p = 1; p <= M; p++)
	{
		
			printf("%i %%\n", p*100/M);	

		
		for (q = 1; q <= M; q++)
		{
			Incx = Cx - Side + 2*Side*(p*co+q*si/2)/M;
			Incy = Cy - Side + 2*Side*(-p*si+q*co/2)/M;
			
		x = 0;
		y = 0;

			for ( n = 1; n <= Num; ++n)
			{
				xx = (x*x - y*y)*(x*x - y*y) - 4*x*x*y*y - Incx;
				yy = 4*x*y*(x*x - y*y) - Incy;
				
				x = xx;
				y = yy;
				md = x*x + y*y;
				wint = md*6000;
				wext = wint;
				r[q] = wint;

				if ( md > Radius )
				  {
					wext = n;
					n = Num;
				  }

			}
					r[q] = wext;
		}
				
		for ( q = 1; q <= M; q++)
			{	
			
		fprintf(fp, "%c", r[q] );
			}
	}
	
	fclose(fp);	
}

/* end of main program */