Programming Languages Suite/JBuilder8.iso/Solaris/resource/jre/demo/plugin/applets/ArcTest/ArcTest.java

Java Source | 2002-09-06 | 5.0 KB | 171 lines

/*
 * Copyright (c) 2002 Sun Microsystems, Inc. All  Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * -Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 * -Redistribution in binary form must reproduct the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)ArcTest.java    1.9 02/06/13
 */

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/**
 * An interactive test of the Graphics.drawArc and Graphics.fillArc
 * routines. Can be run either as a standalone application by
 * typing "java ArcTest" or as an applet in the AppletViewer.
 */
public class ArcTest extends Applet {
    ArcControls controls;   // The controls for marking and filling arcs
    ArcCanvas canvas;       // The drawing area to display arcs

    public void init() {
    setLayout(new BorderLayout());
    canvas = new ArcCanvas();
    add("Center", canvas);
    add("South", controls = new ArcControls(canvas));
    }

    public void destroy() {
        remove(controls);
        remove(canvas);
    }

    public void start() {
    controls.setEnabled(true);
    }

    public void stop() {
    controls.setEnabled(false);
    }

    public void processEvent(AWTEvent e) {
        if (e.getID() == Event.WINDOW_DESTROY) {
            System.exit(0);
        }
    }

    public static void main(String args[]) {
    Frame f = new Frame("ArcTest");
    ArcTest    arcTest = new ArcTest();

    arcTest.init();
    arcTest.start();

    f.add("Center", arcTest);
    f.setSize(300, 300);
    f.show();
    }

    public String getAppletInfo() {
        return "An interactive test of the Graphics.drawArc and \nGraphics.fillArc routines. Can be run \neither as a standalone application by typing 'java ArcTest' \nor as an applet in the AppletViewer.";
    }
}

class ArcCanvas extends Canvas {
    int        startAngle = 0;
    int        endAngle = 45;
    boolean    filled = false;
    Font    font = new java.awt.Font("Courier", Font.BOLD, 12);

    public void paint(Graphics g) {
    Rectangle r = getBounds();
    int hlines = r.height / 10;
    int vlines = r.width / 10;

    g.setColor(Color.pink);
    for (int i = 1; i <= hlines; i++) {
        g.drawLine(0, i * 10, r.width, i * 10);
    }
    for (int i = 1; i <= vlines; i++) {
        g.drawLine(i * 10, 0, i * 10, r.height);
    }

    g.setColor(Color.red);
    if (filled) {
        g.fillArc(0, 0, r.width - 1, r.height - 1, startAngle, endAngle);
    } else {
        g.drawArc(0, 0, r.width - 1, r.height - 1, startAngle, endAngle);
    }

    g.setColor(Color.black);
    g.setFont(font);
    g.drawLine(0, r.height / 2, r.width, r.height / 2);
    g.drawLine(r.width / 2, 0, r.width / 2, r.height);
    g.drawLine(0, 0, r.width, r.height);
    g.drawLine(r.width, 0, 0, r.height);
    int sx = 10;
    int sy = r.height - 28;
    g.drawString("S = " + startAngle, sx, sy);
    g.drawString("E = " + endAngle, sx, sy + 14);
    }

    public void redraw(boolean filled, int start, int end) {
    this.filled = filled;
    this.startAngle = start;
    this.endAngle = end;
    repaint();
    }
}

class ArcControls extends Panel
                  implements ActionListener {
    TextField s;
    TextField e;
    ArcCanvas canvas;

    public ArcControls(ArcCanvas canvas) {
    Button b = null;

    this.canvas = canvas;
    add(s = new TextField("0", 4));
    add(e = new TextField("45", 4));
    b = new Button("Fill");
    b.addActionListener(this);
    add(b);
    b = new Button("Draw");
    b.addActionListener(this);
    add(b);
    }

    public void actionPerformed(ActionEvent ev) {
    String label = ev.getActionCommand();

    canvas.redraw(label.equals("Fill"),
                  Integer.parseInt(s.getText().trim()),
                  Integer.parseInt(e.getText().trim()));
    }
}