/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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.

 *

 *   - Redistributions 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 Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

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.

 */

@SuppressWarnings("serial")

public class ArcTest extends Applet {

    ArcControls controls;   // The controls for marking and filling arcs

    ArcCanvas canvas;       // The drawing area to display arcs

    @Override

    public void init() {

        setLayout(new BorderLayout());

        canvas = new ArcCanvas();

        add("Center", canvas);

        add("South", controls = new ArcControls(canvas));

    }

    @Override

    public void destroy() {

        remove(controls);

        remove(canvas);

    }

    @Override

    public void start() {

        controls.setEnabled(true);

    }

    @Override

    public void stop() {

        controls.setEnabled(false);

    }

    @Override

    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.setVisible(true);

    }

    @Override

    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.";

    }

}

@SuppressWarnings("serial")

class ArcCanvas extends Canvas {

    int startAngle = 0;

    int extent = 45;

    boolean filled = false;

    Font font = new java.awt.Font("SansSerif", Font.PLAIN, 12);

    @Override

    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();

    }

}

@SuppressWarnings("serial")

class ArcControls extends Panel

        implements ActionListener {

    TextField startTF;

    TextField extentTF;

    ArcCanvas canvas;

    @SuppressWarnings("LeakingThisInConstructor")

    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);

    }

    @Override

    public void actionPerformed(ActionEvent ev) {

        String label = ev.getActionCommand();

        int start, extent;

        try {

            start = Integer.parseInt(startTF.getText().trim());

        } catch (NumberFormatException ignored) {

            start = 0;

        }

        try {

            extent = Integer.parseInt(extentTF.getText().trim());

        } catch (NumberFormatException ignored) {

            extent = 0;

        }

        canvas.redraw(label.equals("Fill"), start, extent);

    }

}

@SuppressWarnings("serial")

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.

    //

    @Override

    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

    //

    @Override

    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) {

        try {

            Integer.parseInt(textToCheck, 10);

            return true;

        } catch (NumberFormatException ignored) {

            return false;

        }

    }

}