/***********************************************
* Julia3DfireGen.c
*
*  Generates a RAW format file of a 3D image 
*  of a Julia set (grayscale)
*
*  C source file by Alberto Strumia
*
************************************************/


#include<stdio.h>

/* definition of constants */

#define Radius 10
#define Cx 0.745429
#define Cy 0.11308	
#define Side 0.6	
#define M 700
#define Num 100
#define scale 1
#define co 1.41	
#define si 1.41
#define x0 -1.9*Side	
#define y0 1.2*Side

/* main program */
main()
{

	
	int p, q, n, w, r[M];	
	double x, y, xx, yy, Incx, Incy;
	
	FILE *fp;
	fp = fopen("Julia.raw","w");
	
	for (p = 1; p <= M; p++)
	{
		
			printf("%i %%\n", p*100/M);
		
		for (q = 1; q <= M; q++)
		{
			Incx = x0 - Side + 2*Side*(p*co+q*si)/M;
			Incy = y0 - Side + 2*Side*(-p*si+q*co)/M;
			
		x = Incx;
		y = Incy;
		w = 0;	
			
			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;
					}
			}
		
		
		if ( q >= w )
					{
						r[q - w/scale] = w;
					}
		}

		
		for ( q = 1; q <= M; q++)
			{	
			
		fprintf(fp, "%c", r[q] );
		
		r[q] = 10;	
			}
	}
	
	fclose(fp);
}

/* end of main program */