GCanvas Class Reference

Simple 2D graphics canvas. More...

List of all members.

Public Member Functions
void	GCanvas (Integer width, Integer height, Integer bgcolor)
	Constructs a 2D image drawing canvas.
void	polyline (Array x, Array y, Integer color)
	Draws a polyline.
void	draw (Integer x, Integer y, Integer color)
	Puts a pixel of the defined color in the position x,y.
void	circle (Integer xc, Integer yc, Integer r, Integer color)
	Draws a circle (Bresenham's algorithm).
void	clear ()
	Clears the whole canvas using default background color.
Integer	getcolor (void x, void y)
	Gets a color of a pixel in the position x,y.
void	fill (Integer x, Integer y, Integer color)
	Fills a closed area (using stack).
void	ellipse (Integer xc, Integer yc, Integer a, Integer b, Integer color)
	Draws an ellipse (Bresenham's algorithm).
void	polygon (Array x, Array y, Integer color)
	Draws a polygon (automatically closed if last points are not identical.
void	line (Integer x1, Integer y1, Integer x2, Integer y2, Integer color)
	Draws a line (Bresenham's algorithm).
Public Attributes
Integer	width
	The width of the canvas.
Integer	height
	The height of the canvas.
Array	image
	Internal array representing the image canvas.
String	bgcolor
	The background color of the canvas (HTML format string).

---

Detailed Description

Simple 2D graphics canvas.

x=0,y=0 - top left corner of the canvas. x=width-1,y=height-1 - bottom right corner of the canvas.

---

Constructor & Destructor Documentation

void GCanvas::GCanvas (  Integer  width, Integer  height, Integer  bgcolor )  [inline]

Constructs a 2D image drawing canvas. Parameters: width  The width of the canvas. height  The height of the canvas. bgcolor  The background color of the canvas.

---

Member Function Documentation

void GCanvas::circle (  Integer  xc, Integer  yc, Integer  r, Integer  color )  [inline]

Draws a circle (Bresenham's algorithm). Parameters: xc  X coordinate of the center of the circle. yc  Y coordinate of the center of the circle. r  The radius of the circle. color  The color of the circle.

void GCanvas::draw (  Integer  x, Integer  y, Integer  color )  [inline]

Puts a pixel of the defined color in the position x,y. Parameters: x  X coordinate of the pixel. y  Y coordinate of the pixel. color  The color of the pixel.

void GCanvas::ellipse (  Integer  xc, Integer  yc, Integer  a, Integer  b, Integer  color )  [inline]

Draws an ellipse (Bresenham's algorithm). Parameters: xc  X coordinate of the center of the circle. yc  Y coordinate of the center of the circle. a  The semi-axis of the ellipse. b  The semi-axis of the ellipse. color  The color of the ellipse.

void GCanvas::fill (  Integer  x, Integer  y, Integer  color )  [inline]

Fills a closed area (using stack). Parameters: x  X coordinate of the point inside the area to be filled-in. y  Y coordinate of the point inside the area to be filled-in. color  Fill color.

Integer GCanvas::getcolor (  void  x, void  y )  [inline]

Gets a color of a pixel in the position x,y. Returns: Color of the pixel.

void GCanvas::line (  Integer  x1, Integer  y1, Integer  x2, Integer  y2, Integer  color )  [inline]

Draws a line (Bresenham's algorithm). Parameters: x1  X coordinate of the start pixel. y1  Y coordinate of the start pixel. x2  X coordinate of the ending pixel. y2  Y coordinate of the ending pixel. color  The color of the line.

void GCanvas::polygon (  Array  x, Array  y, Integer  color )  [inline]

Draws a polygon (automatically closed if last points are not identical. Parameters: x  x1,x2, ..., xn. y  y1,y2, ..., yn. color  Polygon color.

void GCanvas::polyline (  Array  x, Array  y, Integer  color )  [inline]

Draws a polyline. Parameters: x  x1,x2, ..., xn. y  y1,y2, ..., yn. color  Polyline color.

---

The documentation for this class was generated from the following file:

• graphics.js

---

This is a documentation for JSGraphics, a powerfull JavaScript graphics library
© 2003 by Kitya Karlson
Produced using DoxyGen.