diva.canvas

Class DamageRegion

java.lang.Object

diva.canvas.DamageRegion

public abstract class DamageRegion
extends Object

A damage region represents a region of the canvas that has been "damaged" and hence needs to be repainted. Damage regions are passed up from a component that creates the damage until they reach the JCanvas, at which point the Swing RepaintManager gets called.

Version:

$Revision: 1.15 $

Author:

John Reekie

Method Summary

Modifier and Type	Method and Description
abstract void	apply(JCanvas canvas) Tell the damage region to inflict itself on the given JCanvas.
void	checkCacheValid(TransformContext c) Check transform cache validity.
static DamageRegion	createDamageRegion(TransformContext c, double x, double y, double w, double h) Create a damage region in this context over the given rectangle.
static DamageRegion	createDamageRegion(TransformContext c, Rectangle2D r) Create a damage region in this context over the given rectangle.
abstract void	extend(Rectangle2D r) Extend the damage region with the given rectangle.
TransformContext	getContext() Get the transform context in which this damage region was created.

Methods inherited from class java.lang.Object

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

Method Detail

apply

public abstract void apply(JCanvas canvas)

Tell the damage region to inflict itself on the given JCanvas.

checkCacheValid

public void checkCacheValid(TransformContext c)

Check transform cache validity. This must be called from the repaint(DamageRegion) method of any component that has a transform context.

createDamageRegion

public static DamageRegion createDamageRegion(TransformContext c,
                                              Rectangle2D r)

Create a damage region in this context over the given rectangle.

createDamageRegion

public static DamageRegion createDamageRegion(TransformContext c,
                                              double x,
                                              double y,
                                              double w,
                                              double h)

Create a damage region in this context over the given rectangle.

extend

public abstract void extend(Rectangle2D r)

Extend the damage region with the given rectangle.

getContext

public TransformContext getContext()

Get the transform context in which this damage region was created.