/*
* @(#)ArcTest.java 1.14 04/07/26
*
* Copyright (c) 2004 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:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce 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 MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
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* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
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*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
/*
* @(#)ArcTest.java 1.14 04/07/26
*/
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 extent = 45;
boolean filled = false;
Font font = new java.awt.Font("SansSerif", Font.PLAIN, 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, extent);
} else {
g.drawArc(0, 0, r.width - 1, r.height - 1, startAngle, extent);
}
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("Start = " + startAngle, sx, sy);
g.drawString("Extent = " + extent, sx, sy + 14);
}
public void redraw(boolean filled, int start, int extent) {
this.filled = filled;
this.startAngle = start;
this.extent = extent;
repaint();
}
}
class ArcControls extends Panel
implements ActionListener {
TextField startTF;
TextField extentTF;
ArcCanvas canvas;
public ArcControls(ArcCanvas canvas) {
Button b = null;
this.canvas = canvas;
add(startTF = new IntegerTextField("0", 4));
add(extentTF = new IntegerTextField("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();
int start, extent;
try {
start = Integer.parseInt(startTF.getText().trim());
} catch (NumberFormatException nfe) {
start = 0;
}
try {
extent = Integer.parseInt(extentTF.getText().trim());
} catch (NumberFormatException nfe) {
extent = 0;
}
canvas.redraw(label.equals("Fill"), start, extent);
}
}
class IntegerTextField extends TextField {
String oldText = null;
public IntegerTextField(String text, int columns) {
super(text, columns);
enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.TEXT_EVENT_MASK);
oldText = getText();
}
// Consume non-digit KeyTyped events
// Note that processTextEvent kind of eliminates the need for this
// function, but this is neater, since ideally, it would prevent
// the text from appearing at all. Sigh. See bugid 4100317/4114565.
//
protected void processEvent(AWTEvent evt) {
int id = evt.getID();
if (id != KeyEvent.KEY_TYPED) {
super.processEvent(evt);
return;
}
KeyEvent kevt = (KeyEvent) evt;
char c = kevt.getKeyChar();
// Digits, backspace, and delete are okay
// Note that the minus sign is allowed, but not the decimal
if (Character.isDigit(c) || (c == '\b') || (c == '\u007f') ||
(c == '\u002d')) {
super.processEvent(evt);
return;
}
Toolkit.getDefaultToolkit().beep();
kevt.consume();
}
// Should consume TextEvents for non-integer Strings
// Store away the text in the tf for every TextEvent
// so we can revert to it on a TextEvent (paste, or
// legal key in the wrong location) with bad text
//
protected void processTextEvent(TextEvent te) {
// The empty string is okay, too
String newText = getText();
if (newText.equals("") || textIsInteger(newText)) {
oldText = newText;
super.processTextEvent(te);
return;
}
Toolkit.getDefaultToolkit().beep();
setText(oldText);
}
// Returns true for Integers (zero and negative
// values are allowed).
// Note that the empty string is not allowed.
//
private boolean textIsInteger(String textToCheck) {
int value = -1;
try {
value = Integer.parseInt(textToCheck, 10);
return true;
} catch (NumberFormatException nfe) {
return false;
}
}
}
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