001: /*
002: * Copyright (c) 2001-2006 JGoodies Karsten Lentzsch. All Rights Reserved.
003: *
004: * Redistribution and use in source and binary forms, with or without
005: * modification, are permitted provided that the following conditions are met:
006: *
007: * o Redistributions of source code must retain the above copyright notice,
008: * this list of conditions and the following disclaimer.
009: *
010: * o Redistributions in binary form must reproduce the above copyright notice,
011: * this list of conditions and the following disclaimer in the documentation
012: * and/or other materials provided with the distribution.
013: *
014: * o Neither the name of JGoodies Karsten Lentzsch nor the names of
015: * its contributors may be used to endorse or promote products derived
016: * from this software without specific prior written permission.
017: *
018: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
020: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
021: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
022: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
025: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
026: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
027: * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
028: * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029: */
030:
031: package com.jgoodies.animation.components;
032:
033: import java.awt.*;
034:
035: import javax.swing.JComponent;
036:
037: /**
038: * A Swing component that paints a circle with a given center, radius and color.
039: *
040: * @author Karsten Lentzsch
041: * @version $Revision: 1.1 $
042: */
043: public final class CircleComponent extends JComponent {
044:
045: private Point center;
046: private int radius;
047: private Color color;
048:
049: /**
050: * Constructs a <code>CircleComponent</code>.
051: */
052: public CircleComponent() {
053: center = new Point(0, 0);
054: radius = 30;
055: color = Color.BLACK;
056: }
057:
058: public void setCenter(Point p) {
059: this .center = p;
060: }
061:
062: public void setRadius(int radius) {
063: this .radius = radius;
064: }
065:
066: public void setColor(Color color) {
067: this .color = color;
068: }
069:
070: /**
071: * Sets the bounds and center point.
072: *
073: * @param x the horizontal origin
074: * @param y the vertical origin
075: * @param w the width, the horizontal extent
076: * @param h the height, the vertical extent
077: */
078: public void setBounds(int x, int y, int w, int h) {
079: super .setBounds(x, y, w, h);
080: setCenter(new Point(x + w / 2, y + h / 2));
081: }
082:
083: /**
084: * Paints the circle with anti-aliasing enabled.
085: *
086: * @param g the Graphics object to render on
087: */
088: public void paintComponent(Graphics g) {
089: Graphics2D g2 = (Graphics2D) g;
090:
091: int diameter = radius * 2;
092: g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
093: RenderingHints.VALUE_ANTIALIAS_ON);
094: g.setColor(color);
095: g2.setStroke(new BasicStroke(4));
096: g2.drawOval(center.x - radius, center.y - radius, diameter,
097: diameter);
098: }
099:
100: }
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