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/*
* @(#)Arcs.java 1.5 98/12/03
*
* Copyright 1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Arc2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.*;
/**
* The Arcs class demonstrates the three closure types for arcs,
* Arc2D Open, Chord & Pie. Animated Pie Arc.
*/
public class Arcs extends JApplet implements Runnable {
// array containing arc closure types.
private static String types[] = {"Arc2D.CHORD","Arc2D.OPEN","Arc2D.PIE"};
// indicates that animated arc's mouth is closed.
private static final int CLOSE = 0;
// indicates that animated arc's mouth is open.
private static final int OPEN = 1;
// indicate direction of animated arc.
private static final int FORWARD = 0;
private static final int BACKWARD = 1;
private static final int DOWN = 2;
private static final int UP = 3;
private Thread thread;
private BufferedImage bimg;
private int aw, ah; // animated arc width & height
private int x, y; // position of animated arc
private int angleStart = 45; // the starting angle of the arc
private int angleExtent = 270; // the extent of the angle of the arc
private int mouth = CLOSE;
private int direction = FORWARD;
public void init() {
setBackground(Color.white);
}
// Resets the position and size of the animated arc
public void reset(int w, int h) {
x = 0; y = 0;
aw = w/12; ah = h/12;
}
public void step(int w, int h) {
// computes the direction of the animated arc
if (x+aw >= w-5 && direction == FORWARD)
direction = DOWN;
if (y+ah >= h-5 && direction == DOWN)
direction = BACKWARD;
if (x-aw <= 5 && direction == BACKWARD)
direction = UP;
if (y-ah <= 5 && direction == UP)
direction = FORWARD;
// computes the angle start and extent
if (mouth == CLOSE) {
angleStart -= 5;
angleExtent += 10;
}
if (mouth == OPEN) {
angleStart += 5;
angleExtent -= 10;
}
if (direction == FORWARD) {
x += 5; y = 0;
}
if (direction == DOWN) {
x = w; y += 5;
}
if (direction == BACKWARD) {
x -= 5; y = h;
}
if (direction == UP) {
x = 0; y -= 5;
}
if (angleStart == 0)
mouth = OPEN;
if (angleStart > 45)
mouth = CLOSE;
}
public void drawDemo(int w, int h, Graphics2D g2) {
g2.setStroke(new BasicStroke(5.0f));
// draw arcs
for (int i = 0; i < types.length; i++) {
Arc2D arc = new Arc2D.Float(i);
arc.setFrame((i+1)*w*.2, (i+1)*h*.2, w*.17, h*.17);
arc.setAngleStart(45);
arc.setAngleExtent(270);
g2.setColor(Color.blue);
g2.draw(arc);
g2.setColor(Color.gray);
g2.fill(arc);
g2.setColor(Color.black);
g2.drawString(types[i], (int)((i+1)*w*.2), (int)((i+1)*h*.2-3));
}
// draws animated pie arc
Arc2D pieArc = new Arc2D.Float(Arc2D.PIE);
pieArc.setFrame(0, 0, aw, ah);
pieArc.setAngleStart(angleStart);
pieArc.setAngleExtent(angleExtent);
AffineTransform at = AffineTransform.getTranslateInstance(x, y);
switch (direction) {
case DOWN : at.rotate(Math.toRadians(90)); break;
case BACKWARD : at.rotate(Math.toRadians(180)); break;
case UP : at.rotate(Math.toRadians(270));
}
g2.setColor(Color.blue);
g2.fill(at.createTransformedShape(pieArc));
}
public Graphics2D createGraphics2D(int w, int h) {
Graphics2D g2 = null;
if (bimg == null || bimg.getWidth() != w || bimg.getHeight() != h) {
bimg = (BufferedImage) createImage(w, h);
reset(w, h);
}
g2 = bimg.createGraphics();
g2.setBackground(getBackground());
g2.clearRect(0, 0, w, h);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
return g2;
}
public void paint(Graphics g) {
Dimension d = getSize();
step(d.width, d.height);
Graphics2D g2 = createGraphics2D(d.width, d.height);
drawDemo(d.width, d.height, g2);
g2.dispose();
g.drawImage(bimg, 0, 0, this);
}
public void start() {
thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.start();
}
public synchronized void stop() {
thread = null;
}
public void run() {
Thread me = Thread.currentThread();
while (thread == me) {
repaint();
try {
thread.sleep(10);
} catch (InterruptedException e) { break; }
}
thread = null;
}
public static void main(String argv[]) {
final Arcs demo = new Arcs();
demo.init();
Frame f = new Frame("Java 2D(TM) Demo - Arcs");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
public void windowDeiconified(WindowEvent e) { demo.start(); }
public void windowIconified(WindowEvent e) { demo.stop(); }
});
f.add(demo);
f.pack();
f.setSize(new Dimension(400,300));
f.show();
demo.start();
}
}
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