diva.util.java2d
Class ShapeUtilities

java.lang.Object
  diva.util.java2d.ShapeUtilities

public final class ShapeUtilities
extends java.lang.Object

A set of utilities on Java2D shapes.

Version:

$Id: ShapeUtilities.java 41477 2006-03-29 00:03:58Z cxh $

Author:

John Reekie, Michael Shilman

Field Summary

private static java.awt.BasicStroke[]	_intStrokes A static array of strokes indexed by width
private static boolean	_jdk12beta4

Constructor Summary

ShapeUtilities()

Method Summary

static java.awt.Shape	cloneShape(java.awt.Shape s) Clone a shape.
static java.awt.geom.Rectangle2D	computeStrokedBounds(java.awt.Shape shape, java.awt.Stroke stroke) Compute the bounds of a shape when stroked with the given stroke.
static java.awt.Shape	createCloudShape() Create the "cloud" shape.
static java.awt.Shape	createSwatchShape() Create the "swatch" shape.
static java.awt.BasicStroke	getStroke(float floatwidth) Get a new stroke of the given width and with no dashing.
static java.awt.BasicStroke	getStroke(int width) Get a stroke of the given width and with no dashing.
static boolean	intersectsOutline(java.awt.geom.Rectangle2D r, java.awt.Shape s) Return true if the outline of the given shape intersects with the given rectangle.
static boolean	isOrthogonal(java.awt.geom.AffineTransform at) Return true if the given transform maps a rectangle to a rectangle.
static boolean	jdk12beta4() Test if we are running in JDK1.2beta4
static void	main(java.lang.String[] argv) Main function.
static java.lang.String	printShapeAsCode(java.lang.String name, java.awt.Shape shape) Print a Shape to a String, as a code fragment that creates a new GeneralPath.
static java.awt.geom.Rectangle2D	transformBounds(java.awt.geom.Rectangle2D rect, java.awt.geom.AffineTransform at) Given a bounding-box rectangle, return a new rectangle by transforming the argument rectangle and taking the bounding box of the result.
static java.awt.Shape	transformModify(java.awt.Shape s, java.awt.geom.AffineTransform at) Transform a shape with the supplied transform.
static void	transformModifyRect(java.awt.geom.RectangularShape s, java.awt.geom.AffineTransform at) In-place transform of a rectangular shape.
static java.awt.Shape	translateModify(java.awt.Shape s, double x, double y) Translate a shape the given distance.

Methods inherited from class java.lang.Object

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

Field Detail

_jdk12beta4

private static boolean _jdk12beta4

_intStrokes

private static java.awt.BasicStroke[] _intStrokes

A static array of strokes indexed by width

Constructor Detail

ShapeUtilities

public ShapeUtilities()

Method Detail

jdk12beta4

public static boolean jdk12beta4()

Test if we are running in JDK1.2beta4

cloneShape

public static java.awt.Shape cloneShape(java.awt.Shape s)

Clone a shape. This method is needed because Shape does not define clone(), although many shape classes do.

createCloudShape

public static java.awt.Shape createCloudShape()

Create the "cloud" shape. If running in JDK1.2 beta4, generate the shape on-the-fly using the Area class and return it. If running in JDK1.2 final, which has the screwed-up Area code, just generate a hardwired path (using code that was generated by running in beta4!!!) The shape is bounded by the rectangle (0,0,100,100).

createSwatchShape

public static java.awt.Shape createSwatchShape()

Create the "swatch" shape. If running in JDK1.2 beta4, generate the shape on-the-fly using the Area class and return it. If running in JDK1.2 final, which has the screwed-up Area code, just generate a hardwired path (using code that was generated by running in beta4!!!) The shape is bounded by the rectangle (0,0,100,100).

computeStrokedBounds

public static java.awt.geom.Rectangle2D computeStrokedBounds(java.awt.Shape shape,
                                                             java.awt.Stroke stroke)

Compute the bounds of a shape when stroked with the given stroke.

getStroke

public static java.awt.BasicStroke getStroke(int width)

Get a stroke of the given width and with no dashing. This method will generally return an existing stroke object, and can be used to save creating zillions of Stroke objects.

getStroke

public static java.awt.BasicStroke getStroke(float floatwidth)

Get a new stroke of the given width and with no dashing. This method will return an existing stroke object if the width is integer-valued and has a reasonably small width. This method can be used to save creating zillions of Stroke objects.

intersectsOutline

public static boolean intersectsOutline(java.awt.geom.Rectangle2D r,
                                        java.awt.Shape s)

Return true if the outline of the given shape intersects with the given rectangle.

isOrthogonal

public static boolean isOrthogonal(java.awt.geom.AffineTransform at)

Return true if the given transform maps a rectangle to a rectangle. If this is true, then the transform is optimized when using the transform methods of this class.

printShapeAsCode

public static java.lang.String printShapeAsCode(java.lang.String name,
                                                java.awt.Shape shape)

Print a Shape to a String, as a code fragment that creates a new GeneralPath.

transformBounds

public static java.awt.geom.Rectangle2D transformBounds(java.awt.geom.Rectangle2D rect,
                                                        java.awt.geom.AffineTransform at)

Given a bounding-box rectangle, return a new rectangle by transforming the argument rectangle and taking the bounding box of the result. This method is essentially a faster version of AffineTransform.createTransformShape() if the shape is a Rectangle2D and the transform is identity, or orthogonal. Note that the argument rectangle is not modified, and the transform does not need to be orthogonal.

transformModifyRect

public static void transformModifyRect(java.awt.geom.RectangularShape s,
                                       java.awt.geom.AffineTransform at)

In-place transform of a rectangular shape. The passed rectangular shape will be modified according to the given transform. This is essentially an in-place implementation of the ShapeUtilities.transformBounds() method.

transformModify

public static java.awt.Shape transformModify(java.awt.Shape s,
                                             java.awt.geom.AffineTransform at)

Transform a shape with the supplied transform. If possible, this method modifies the shape directly and returns a pointer to that same shape. In particular, instances of Rectangle2D, Polygon2D, Polyline2D, and GeneralPath will be modified directly. (In the case of RectangularShape, only if the transform is orthogonal.) Otherwise, a general transformation is used that creates and returns a new instance of GeneralPath.

translateModify

public static java.awt.Shape translateModify(java.awt.Shape s,
                                             double x,
                                             double y)

Translate a shape the given distance. If possible, this method modifies the shape directly and returns a pointer to that same shape. In particular, instances of RectangularShape, Polygon2D, Polyline2D, and GeneralPath are modified directly. Otherwise, a general transformation is used that creates and returns a new instance of GeneralPath.

main

public static void main(java.lang.String[] argv)

Main function. Depending on what version of Java we are running, print out a bunch of information to stdout.