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Graphics Utilities and Libraries for working with Java2D.
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/*
* $Id: Star2D.java 3863 2010-10-26 02:53:32Z kschaefe $
*
* Dual-licensed under LGPL (Sun and Romain Guy) and BSD (Romain Guy).
*
* Copyright 2005 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* Copyright (c) 2006 Romain Guy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jdesktop.swingx.geom;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
/**
* This class provides a star shape. A star is defined by two radii and a
* number of branches. Each branch spans between the two radii. The inner
* radius is the distance between the center of the star and the origin of the
* branches. The outer radius is the distance between the center of the star
* and the tips of the branches.
*
* @author Romain Guy
*/
public class Star2D implements Shape {
private Shape starShape;
private double x;
private double y;
private double innerRadius;
private double outerRadius;
private int branchesCount;
/**
* Creates a new star whose center is located at the specified
* x and y coordinates. The number of branches
* and their length can be specified.
*
* @param x the location of the star center
* @param y the location of the star center
* @param innerRadius the distance between the center of the star and the
* origin of the branches
* @param outerRadius the distance between the center of the star and the
* tip of the branches
* @param branchesCount the number of branches in this star; must be >= 3
* @throws IllegalArgumentException if branchesCount is < 3 or
* if innerRadius is >= outerRadius
*/
public Star2D(double x, double y,
double innerRadius, double outerRadius,
int branchesCount) {
if (branchesCount < 3) {
throw new IllegalArgumentException("The number of branches must" +
" be >= 3.");
} else if (innerRadius >= outerRadius) {
throw new IllegalArgumentException("The inner radius must be < " +
"outer radius.");
}
this.x = x;
this.y = y;
this.innerRadius = innerRadius;
this.outerRadius = outerRadius;
this.branchesCount = branchesCount;
starShape = generateStar(x, y, innerRadius, outerRadius, branchesCount);
}
private static Shape generateStar(double x, double y,
double innerRadius, double outerRadius,
int branchesCount) {
GeneralPath path = new GeneralPath();
double outerAngleIncrement = 2 * Math.PI / branchesCount;
double outerAngle = branchesCount % 2 == 0 ? 0.0 : -(Math.PI / 2.0);
double innerAngle = (outerAngleIncrement / 2.0) + outerAngle;
float x1 = (float) (Math.cos(outerAngle) * outerRadius + x);
float y1 = (float) (Math.sin(outerAngle) * outerRadius + y);
float x2 = (float) (Math.cos(innerAngle) * innerRadius + x);
float y2 = (float) (Math.sin(innerAngle) * innerRadius + y);
path.moveTo(x1, y1);
path.lineTo(x2, y2);
outerAngle += outerAngleIncrement;
innerAngle += outerAngleIncrement;
for (int i = 1; i < branchesCount; i++) {
x1 = (float) (Math.cos(outerAngle) * outerRadius + x);
y1 = (float) (Math.sin(outerAngle) * outerRadius + y);
path.lineTo(x1, y1);
x2 = (float) (Math.cos(innerAngle) * innerRadius + x);
y2 = (float) (Math.sin(innerAngle) * innerRadius + y);
path.lineTo(x2, y2);
outerAngle += outerAngleIncrement;
innerAngle += outerAngleIncrement;
}
path.closePath();
return path;
}
/**
* Sets the inner radius of the star, that is the distance between its
* center and the origin of the branches. The inner radius must always be
* lower than the outer radius.
*
* @param innerRadius the distance between the center of the star and the
* origin of the branches
* @throws IllegalArgumentException if the inner radius is >= outer radius
*/
public void setInnerRadius(double innerRadius) {
if (innerRadius >= outerRadius) {
throw new IllegalArgumentException("The inner radius must be <" +
" outer radius.");
}
this.innerRadius = innerRadius;
starShape = generateStar(getX(), getY(), innerRadius, getOuterRadius(),
getBranchesCount());
}
/**
* Sets location of the center of the star.
*
* @param x the x location of the center of the star
*/
public void setX(double x) {
this.x = x;
starShape = generateStar(x, getY(), getInnerRadius(), getOuterRadius(),
getBranchesCount());
}
/**
* Sets the location of the center of the star.
*
* @param y the x location of the center of the star
*/
public void setY(double y) {
this.y = y;
starShape = generateStar(getX(), y, getInnerRadius(), getOuterRadius(),
getBranchesCount());
}
/**
* Sets the outer radius of the star, that is the distance between its
* center and the tips of the branches. The outer radius must always be
* greater than the inner radius.
*
* @param outerRadius the distance between the center of the star and the
* tips of the branches
* @throws IllegalArgumentException if the inner radius is >= outer radius
*/
public void setOuterRadius(double outerRadius) {
if (innerRadius >= outerRadius) {
throw new IllegalArgumentException("The outer radius must be > " +
"inner radius.");
}
this.outerRadius = outerRadius;
starShape = generateStar(getX(), getY(), getInnerRadius(), outerRadius,
getBranchesCount());
}
/**
* Sets the number branches of the star. A star must always have at least
* 3 branches.
*
* @param branchesCount the number of branches
* @throws IllegalArgumentException if branchesCount is <=2
*/
public void setBranchesCount(int branchesCount) {
if (branchesCount <= 2) {
throw new IllegalArgumentException("The number of branches must" +
" be >= 3.");
}
this.branchesCount = branchesCount;
starShape = generateStar(getX(), getY(), getInnerRadius(),
getOuterRadius(), branchesCount);
}
/**
* Returns the location of the center of star.
*
* @return the x coordinate of the center of the star
*/
public double getX() {
return x;
}
/**
* Returns the location of the center of star.
*
* @return the y coordinate of the center of the star
*/
public double getY() {
return y;
}
/**
* Returns the distance between the center of the star and the origin
* of the branches.
*
* @return the inner radius of the star
*/
public double getInnerRadius() {
return innerRadius;
}
/**
* Returns the distance between the center of the star and the tips
* of the branches.
*
* @return the outer radius of the star
*/
public double getOuterRadius() {
return outerRadius;
}
/**
* Returns the number of branches of the star.
*
* @return the number of branches, always >= 3
*/
public int getBranchesCount() {
return branchesCount;
}
/**
* {@inheritDoc}
*/
@Override
public Rectangle getBounds() {
return starShape.getBounds();
}
/**
* {@inheritDoc}
*/
@Override
public Rectangle2D getBounds2D() {
return starShape.getBounds2D();
}
/**
* {@inheritDoc}
*/
@Override
public boolean contains(double x, double y) {
return starShape.contains(x, y);
}
/**
* {@inheritDoc}
*/
@Override
public boolean contains(Point2D p) {
return starShape.contains(p);
}
/**
* {@inheritDoc}
*/
@Override
public boolean intersects(double x, double y, double w, double h) {
return starShape.intersects(x, y, w, h);
}
/**
* {@inheritDoc}
*/
@Override
public boolean intersects(Rectangle2D r) {
return starShape.intersects(r);
}
/**
* {@inheritDoc}
*/
@Override
public boolean contains(double x, double y, double w, double h) {
return starShape.contains(x, y, w, h);
}
/**
* {@inheritDoc}
*/
@Override
public boolean contains(Rectangle2D r) {
return starShape.contains(r);
}
/**
* {@inheritDoc}
*/
@Override
public PathIterator getPathIterator(AffineTransform at) {
return starShape.getPathIterator(at);
}
/**
* {@inheritDoc}
*/
@Override
public PathIterator getPathIterator(AffineTransform at, double flatness) {
return starShape.getPathIterator(at, flatness);
}
}