diva.canvas
Class DamageRegion

java.lang.Object
  diva.canvas.DamageRegion

Direct Known Subclasses:

DamageRegion.RectangleDamageRegion

public abstract class DamageRegion
extends java.lang.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:

$Id: DamageRegion.java 38798 2005-07-08 20:00:01Z cxh $

Author:

John Reekie

Accepted Rating:

Red

Nested Class Summary

private static class

DamageRegion.RectangleDamageRegion A rectangular damage region.

Field Summary

(package private) TransformContext

_context

Constructor Summary

DamageRegion()
FIXME: Visual Cafe barfs on this private

Method Summary

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, java.awt.geom.Rectangle2D r) Create a damage region in this context over the given rectangle.
abstract void	extend(java.awt.geom.Rectangle2D r) Extend the damage region with the given rectangle.
abstract java.awt.geom.Rectangle2D	getBounds() Get the bounds of this damage region.
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

Field Detail

_context

TransformContext _context

Constructor Detail

DamageRegion

DamageRegion()

FIXME: Visual Cafe barfs on this private

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,
                                              java.awt.geom.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(java.awt.geom.Rectangle2D r)

Extend the damage region with the given rectangle.

getBounds

public abstract java.awt.geom.Rectangle2D getBounds()

Get the bounds of this damage region.

getContext

public TransformContext getContext()

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