Color Difference : Color « 2D Graphics GUI « Java

Color Difference

        
 


import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

/*
 * ColorDifference.java
 *
 * Created on May 3, 2007, 7:12 AM
 *
 * 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 ColorDifference extends JComponent implements ActionListener {

  private Color largeRectColors[] = { Color.BLACK, new Color(3, 3, 3) };

  private Color smallRectColors[] = { Color.BLACK, Color.WHITE };

  private int colorIndex = 0;

  private static int FADE_X = 0;

  private static int BLANK_X = 0;

  /** Creates a new instance of ColorDifference */
  public ColorDifference() {
    Timer timer = new Timer(1000, this);
    timer.start();
    setPreferredSize(new Dimension(300, 200));
  }

  /**
   * Displays our component with the animating colors of the areas on the left
   * and right, separated by an area of white in the middle
   */
  @Override
  protected void paintComponent(Graphics g) {
    int fadeX = 0;
    int blankX = getWidth() / 3;
    int bigRectW = getWidth() / 3;

    // Fill left-side rectangle with current animating color
    g.setColor(largeRectColors[colorIndex]);
    g.fillRect(0, 0, bigRectW, getHeight());

    // Fill middle area with white
    g.setColor(Color.WHITE);
    g.fillRect(bigRectW, 0, bigRectW, getHeight());

    // Fill right-side rectangle with black, with a white square
    // in the middle
    int bigRectX = 2 * bigRectW;
    int smallRectW = 4;
    int smallRectH = 4;
    int smallRectX = bigRectX + (bigRectW / 2) - (smallRectW / 2);
    int smallRectY = (getHeight() / 2) - (smallRectH / 2);
    g.setColor(Color.BLACK);
    g.fillRect(2 * getWidth() / 3, 0, getWidth() / 3, getHeight());
    g.setColor(smallRectColors[colorIndex]);
    g.fillRect(smallRectX, smallRectY, smallRectW, smallRectH);
  }

  /**
   * Handles Timer events by toggling the colorIndex used to fill the left-side
   * rectangle
   */
  public void actionPerformed(ActionEvent ae) {
    colorIndex++;
    colorIndex = colorIndex % 2;
    repaint();
  }

  private static void createAndShowGUI() {
    JFrame f = new JFrame("Color Difference");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(300, 200);
    ColorDifference component = new ColorDifference();
    f.add(component);
    f.pack();
    f.setVisible(true);
  }

  /**
   * @param args
   *          the command line arguments
   */
  public static void main(String[] args) {
    Runnable doCreateAndShowGUI = new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    };
    SwingUtilities.invokeLater(doCreateAndShowGUI);
  }
}

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