com.mxgraph.canvas
Class mxBasicCanvas

java.lang.Object
  com.mxgraph.canvas.mxBasicCanvas

All Implemented Interfaces:

mxICanvas

Direct Known Subclasses:

mxGraphics2DCanvas, mxHtmlCanvas, mxSvgCanvas, mxVmlCanvas

public abstract class mxBasicCanvas
extends Object
implements mxICanvas

Field Summary

static String	DEFAULT_IMAGEBASEPATH Defines the default value for the imageBasePath in all GDI canvases.
protected boolean	drawLabels Specifies whether labels should be painted.
protected String	imageBasePath Defines the base path for images with relative paths.
protected Hashtable<String,BufferedImage>	imageCache Cache for images.
static boolean	PRESERVE_IMAGE_ASPECT Specifies if image aspect should be preserved in drawImage.
protected double	scale Specifies the current scale.
protected Point	translate Specifies the current translation.

Constructor Summary

mxBasicCanvas()

Method Summary

void	flushImageCache()
String	getImageBasePath()
String	getImageForStyle(Map<String,Object> style) Gets the image path from the given style.
double	getScale() Returns the scale.
Point	getTranslate() Returns the current translate.
boolean	isDrawLabels()
BufferedImage	loadImage(String image) Returns an image instance for the given URL.
void	setDrawLabels(boolean drawLabels)
void	setImageBasePath(String imageBasePath)
void	setScale(double scale) Sets the scale for the following drawing requests.
void	setTranslate(int dx, int dy) Sets the current translate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.mxgraph.canvas.mxICanvas

drawCell, drawLabel

Field Detail

PRESERVE_IMAGE_ASPECT

public static boolean PRESERVE_IMAGE_ASPECT

Specifies if image aspect should be preserved in drawImage. Default is true.

DEFAULT_IMAGEBASEPATH

public static String DEFAULT_IMAGEBASEPATH

Defines the default value for the imageBasePath in all GDI canvases. Default is an empty string.

imageBasePath

protected String imageBasePath

Defines the base path for images with relative paths. Trailing slash is required. Default value is DEFAULT_IMAGEBASEPATH.

translate

protected Point translate

Specifies the current translation. Default is (0,0).

scale

protected double scale

Specifies the current scale. Default is 1.

drawLabels

protected boolean drawLabels

Specifies whether labels should be painted. Default is true.

imageCache

protected Hashtable<String,BufferedImage> imageCache

Cache for images.

Constructor Detail

mxBasicCanvas

public mxBasicCanvas()

Method Detail

setTranslate

public void setTranslate(int dx,
                         int dy)

Sets the current translate.

Specified by:

setTranslate in interface mxICanvas

getTranslate

public Point getTranslate()

Returns the current translate.

Specified by:

getTranslate in interface mxICanvas

Returns:

Returns the current translation.

setScale

public void setScale(double scale)

Description copied from interface: mxICanvas

Sets the scale for the following drawing requests.

Specified by:

setScale in interface mxICanvas

getScale

public double getScale()

Description copied from interface: mxICanvas

Returns the scale.

Specified by:

getScale in interface mxICanvas

setDrawLabels

public void setDrawLabels(boolean drawLabels)

getImageBasePath

public String getImageBasePath()

setImageBasePath

public void setImageBasePath(String imageBasePath)

isDrawLabels

public boolean isDrawLabels()

loadImage

public BufferedImage loadImage(String image)

Returns an image instance for the given URL. If the URL has been loaded before than an instance of the same instance is returned as in the previous call.

flushImageCache

public void flushImageCache()

getImageForStyle

public String getImageForStyle(Map<String,Object> style)

Gets the image path from the given style. If the path is relative (does not start with a slash) then it is appended to the imageBasePath.