RotationAboutCenter.java Source code

Introduction

Here is the source code for RotationAboutCenter.java

Source

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
/*
 * RotationAboutCenter.java
 *
 * Created on May 1, 2007, 4:14 PM
 *
 * Copyright (c) 2007, 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.
 *   * 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 the TimingFramework project 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, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 *
 * @author Chet
 */
public class RotationAboutCenter extends JComponent {

    /** Creates a new instance of RotationAboutCenter */
    public RotationAboutCenter() {
    }

    protected void paintComponent(Graphics g) {
        Graphics2D g2d;
        g2d = (Graphics2D) g.create();

        // Erase background to white
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0, 0, getWidth(), getHeight());

        // base rectangle
        g2d.setColor(Color.GRAY.brighter());
        g2d.fillRect(50, 50, 50, 50);

        // rotated 45 degrees around origin
        g2d.rotate(Math.toRadians(45));
        g2d.setColor(Color.GRAY.darker());
        g2d.fillRect(50, 50, 50, 50);

        // rotated 45 degrees about center of rect
        g2d = (Graphics2D) g.create();
        g2d.rotate(Math.toRadians(45), 75, 75);
        g2d.setColor(Color.BLACK);
        g2d.fillRect(50, 50, 50, 50);

        // done with g2d, dispose it
        g2d.dispose();
    }

    private static void createAndShowGUI() {
        JFrame f = new JFrame("Rotation");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(200, 200);
        f.add(new RotationAboutCenter());
        f.setVisible(true);
    }

    public static void main(String args[]) {
        Runnable doCreateAndShowGUI = new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        };
        SwingUtilities.invokeLater(doCreateAndShowGUI);
    }
}