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Quadratic fractal set generation.

/*******************************************************************************
+* Soporte para librerķa png.
+*
+* 7.07.2005
+*
+* $Id: mypng.h,v 1.1 2011/10/18 08:42:34 cvsmgr Exp $
+* $Name:  $
*******************************************************************************/
# include "png.h"

# define ERROR 1
# define OK    0
# define NUM_COLS (768)
# define NUM_ROWS (576)
# define SIDE     10.0
# define INCR     (SIDE/NUM_COLS)
# define NUM_TEXT      7
# define TEXT_LENGTH 256

typedef int BOOL;

BOOL           ReadPNGText(char *file_name);
BOOL           WritePNG(char *file_name, png_colorpp pixels,
                        png_textp text_ptr, int num_text);
png_colorpp    AllocatePNG(png_uint_32 height, png_uint_32 width);
void           BuildTextPtr(png_textp info_text, double alpha, double beta, int itermax,
                            double side_len, double offset_x, double offset_y);
void           DeallocatePNG(png_colorpp p, png_uint_32 height, png_uint_32 width);
double         PixToCoordX(int x);
int            CoordXToPix(double x);
double         PixToCoordY(int y);
int            CoordYToPix(double y);
void           SetSide(double l);
void           SetImageSize(int rows, int columns);
void           SetOffsetX(double off_x);
void           SetOffsetY(double off_y);
void           DrawVertiLine(png_colorpp image, double coord_x, png_color p);
void           DrawHorizLine(png_colorpp image, double coord_y, png_color p);