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Java Source | 1998-05-08 | 4.3 KB | 151 lines |
- /*
- * @(#)ArcTest.java 1.3 96/12/06
- *
- * Copyright (c) 1994-1996 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.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;
- public void init() {
- setLayout(new BorderLayout());
- ArcCanvas c = new ArcCanvas();
- add("Center", c);
- add("South", controls = new ArcControls(c));
- }
-
- public void start() {
- controls.enable();
- }
-
- public void stop() {
- controls.disable();
- }
-
- public boolean handleEvent(Event e) {
- if (e.id == Event.WINDOW_DESTROY) {
- System.exit(0);
- }
- return false;
- }
-
- public static void main(String args[]) {
- Frame f = new Frame("ArcTest");
- ArcTest arcTest = new ArcTest();
-
- arcTest.init();
- arcTest.start();
-
- f.add("Center", arcTest);
- f.resize(300, 300);
- f.show();
- }
- }
-
-
- class ArcCanvas extends Canvas {
- int startAngle = 0;
- int endAngle = 45;
- boolean filled = false;
- Font font;
-
- public void paint(Graphics g) {
- Rectangle r = bounds();
- 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 {
- TextField s;
- TextField e;
- ArcCanvas canvas;
-
- public ArcControls(ArcCanvas canvas) {
- this.canvas = canvas;
- add(s = new TextField("0", 4));
- add(e = new TextField("45", 4));
- add(new Button("Fill"));
- add(new Button("Draw"));
- }
-
- public boolean action(Event ev, Object arg) {
- if (ev.target instanceof Button) {
- String label = (String)arg;
-
- canvas.redraw(label.equals("Fill"),
- Integer.parseInt(s.getText().trim()),
- Integer.parseInt(e.getText().trim()));
-
- return true;
- }
-
- return false;
- }
- }
-
-