C:/Users/Malcolm/Documents/temp/binaryimagelibrary/drawbinary.c File Reference

#include <stdlib.h>
#include <string.h>

Functions
void	binaryline (unsigned char *binary, int width, int height, int x0, int y0, int x1, int y1)
void	binarycircle (unsigned char *binary, int width, int height, int xm, int ym, int r)
void	binaryellipse (unsigned char *binary, int width, int height, int x0, int y0, int x1, int y1)
void	binarybezier (unsigned char *binary, int width, int height, float *x, float *y)
void	binarycatmullrom (unsigned char *binary, int width, int height, float *x, float *y, int N)
int	floodfill4 (unsigned char *grey, int width, int height, int x, int y, unsigned char target, unsigned char dest)
int	floodfill8 (unsigned char *grey, int width, int height, int x, int y, unsigned char target, unsigned char dest)

Detailed Description

Basic drawing routines for binary images.

Unlikely to want to draw many binary images for human viewing, but the roi=utines are useful for itnermediates steps. They are also good simple reference implementations of algorithms.

Function Documentation

void binarybezier	(	unsigned char *	binary,
		int	width,
		int	height,
		float *	x,
		float *	y
	)

Draw a cubic Bezier curve

Parameters

[in,out]	biary	- the bianry image
	width	- image width
	height	- image height
[in]	x	- 4 Bezier control points x
[in]	y	- 4 Bezier control points y

void binarycatmullrom	(	unsigned char *	binary,
		int	width,
		int	height,
		float *	x,
		float *	y,
		int	N
	)

Draw a Catmull-Rom curve

Parameters

void binarycircle	(	unsigned char *	binary,
		int	width,
		int	height,
		int	xm,
		int	ym,
		int	r
	)

Draw an open circle using quadrant mirroring

Parameters

[in,out]	binary	- the binary image
	width	- image width
	height	- image height
	xm	- origin x
	ym	- origin y
	r	- radius.

Notes: interger only algorithm

void binaryellipse	(	unsigned char *	binary,
		int	width,
		int	height,
		int	x0,
		int	y0,
		int	x1,
		int	y1
	)

Draw an ellipse.

Parameters

void binaryline	(	unsigned char *	binary,
		int	width,
		int	height,
		int	x0,
		int	y0,
		int	x1,
		int	y1
	)

Draw a line using Brasenham's algorithm.

Parameters

[in,out]	binary	- the binary image
	width	- image width
	height	- image height
	x0	- start x co-ordinate
	y0	- start y co-ordiante
	x1	- end x co-ordinate
	y1	- end y co-ordinate

int floodfill4	(	unsigned char *	grey,
		int	width,
		int	height,
		int	x,
		int	y,
		unsigned char	target,
		unsigned char	dest
	)

Floodfill4 - floodfill, 4 connectivity.

Parameters

[in,out]	grey	- the image (formally it's greyscale but it could be binary or indexed)
	width	- image width
	height	- image height
	x	- seed point x
	y	- seed point y
	target	- the colour to flood
	dest	- the colur to replace it by.

Returns

Number of pixels flooded.