com.gargoylesoftware.htmlunit.javascript.host.canvas.rendering

Interface RenderingBackend

All Known Implementing Classes:

AwtRenderingBackend, GaeRenderingBackend

public interface RenderingBackend

Interface to the rendering context used by CanvasRenderingContext2D. We have this abstraction to support GAE also.

Author:

Ronald Brill

Method Summary

Methods

Modifier and Type	Method and Description
void	drawImage(ImageReader imageReader, int dxI, int dyI) Draws images onto the context.
String	encodeToString(String type) Constructs a base64 encoded string out of the image data.
void	fillRect(int x, int y, int w, int h) Paints the specified rectangular area.
byte[]	getBytes(int width, int height, int sx, int sy) Creates a byte array containing the (4) color values of all pixels.
void	setFillStyle(String fillStyle) Sets the fillStyle property.

Method Detail

setFillStyle

void setFillStyle(String fillStyle)

Sets the fillStyle property.

Parameters:

fillStyle - the fillStyle property

fillRect

void fillRect(int x,
            int y,
            int w,
            int h)

Paints the specified rectangular area.

Parameters:

x - the x

y - the y

w - the width

h - the height

drawImage

void drawImage(ImageReader imageReader,
             int dxI,
             int dyI)
               throws IOException

Draws images onto the context.

Parameters:

imageReader - the reader to read the image from 8the first one)

dxI - the x coordinate of the starting point (top left)

dyI - the y coordinate of the starting point (top left)

Throws:

IOException - in case o problems

getBytes

byte[] getBytes(int width,
              int height,
              int sx,
              int sy)

Creates a byte array containing the (4) color values of all pixels.

Parameters:

width - the width

height - the height

sx - start point x

sy - start point y

Returns:

the bytes

encodeToString

String encodeToString(String type)
                      throws IOException

Constructs a base64 encoded string out of the image data.

Parameters:

type - the name of the image format

Returns:

the base64 encoded string

Throws:

IOException - in case o problems