Programming Languages Suite/ProgramD2.iso/J A V A/Java Development Kit V1.2/jdk12-win32(1).exe/data1.cab/demos/demo/applets/ArcTest/ArcTest.java

Java Source | 1998-12-01 | 4.7 KB | 162 lines

/*
 * @(#)ArcTest.java    1.5 98/06/29
 *
 * Copyright (c) 1997, 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * 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 SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING 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.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

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;

    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()));
    }
}