gradient.java

功能强大的绘图演示程序

/*
 * @(#)Gradient.java	1.15 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 
 * 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 THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

/*
 * @(#)Gradient.java	1.12 03/01/23
 */

package java2d.demos.Paint;


import java.awt.*;
import java.awt.font.*;
import java.awt.event.*;
import java.awt.geom.Rectangle2D;
import javax.swing.*;
import java2d.ControlsSurface;
import java2d.CustomControls;



public class Gradient extends ControlsSurface {

    protected Color innerC, outerC;
    private DemoControls controls;


    public Gradient() {
        setBackground(Color.white);
        innerC = Color.green;
        outerC = Color.blue;
        setControls(new Component[] { new DemoControls(this) });
    }


    public void render(int w, int h, Graphics2D g2) {

        int w2 = w/2;
        int h2 = h/2;
        g2.setPaint(new GradientPaint(0,0,outerC,w*.35f,h*.35f,innerC));
        g2.fillRect(0, 0, w2, h2);
        g2.setPaint(new GradientPaint(w,0,outerC,w*.65f,h*.35f,innerC));
        g2.fillRect(w2, 0, w2, h2);
        g2.setPaint(new GradientPaint(0,h,outerC,w*.35f,h*.65f,innerC));
        g2.fillRect(0, h2, w2, h2);
        g2.setPaint(new GradientPaint(w,h,outerC,w*.65f,h*.65f,innerC));
        g2.fillRect(w2, h2, w2, h2);

        g2.setColor(Color.black);
        TextLayout tl = new TextLayout(
                "GradientPaint", g2.getFont(), g2.getFontRenderContext());
        tl.draw(g2, (int) (w/2-tl.getBounds().getWidth()/2),
                (int) (h/2+tl.getBounds().getHeight()/2));
    }


    public static void main(String s[]) {
        createDemoFrame(new Gradient());
    }


    static class DemoControls extends CustomControls implements ActionListener {

        Gradient demo;
        Color colors[] = 
                { Color.red, Color.orange, Color.yellow, Color.green,
                  Color.blue, Color.lightGray, Color.cyan, Color.magenta };
        String colorName[] =
                { "Red", "Orange", "Yellow", "Green", 
                  "Blue", "lightGray", "Cyan", "Magenta" };
        
        JMenuItem innerMI[] = new JMenuItem[colors.length];
        JMenuItem outerMI[] = new JMenuItem[colors.length];
        ColoredSquare squares[] = new ColoredSquare[colors.length];
        JMenu imenu, omenu;

        public DemoControls(Gradient demo) {
            super(demo.name);
            this.demo = demo;
            JMenuBar inMenuBar = new JMenuBar();
            add(inMenuBar);
            JMenuBar outMenuBar = new JMenuBar();
            add(outMenuBar);
            Font font = new Font("serif", Font.PLAIN, 10);

            imenu = (JMenu) inMenuBar.add(new JMenu("Inner Color"));
            imenu.setFont(font);
            imenu.setIcon(new ColoredSquare(demo.innerC));
            omenu = (JMenu) outMenuBar.add(new JMenu("Outer Color"));
            omenu.setFont(font);
            omenu.setIcon(new ColoredSquare(demo.outerC));
            for (int i = 0; i < colors.length; i++) {
                squares[i] = new ColoredSquare(colors[i]);
                innerMI[i] = imenu.add(new JMenuItem(colorName[i]));
                innerMI[i].setFont(font);
                innerMI[i].setIcon(squares[i]);
                innerMI[i].addActionListener(this);
                outerMI[i] = omenu.add(new JMenuItem(colorName[i]));
                outerMI[i].setFont(font);
                outerMI[i].setIcon(squares[i]);
                outerMI[i].addActionListener(this);
            } 
        }


        public void actionPerformed(ActionEvent e) {
            for (int i = 0; i < colors.length; i++) {
                if (e.getSource().equals(innerMI[i])) {
                    demo.innerC = colors[i];
                    imenu.setIcon(squares[i]);
                    break;
                } else if (e.getSource().equals(outerMI[i])) {
                    demo.outerC = colors[i];
                    omenu.setIcon(squares[i]);
                    break;
                }
            }
            demo.repaint();
        }


        public Dimension getPreferredSize() {
            return new Dimension(200,37);
        }


        public void run() {
            // goto double buffering
            if (demo.getImageType() <= 1) {
                demo.setImageType(2);
            }
            Thread me = Thread.currentThread();
            while (thread == me) {
                for (int i = 0; i < innerMI.length; i++) {
                    if (i != 4) {
                        try {
                            thread.sleep(4444);
                        } catch (InterruptedException e) { return; }
                        innerMI[i].doClick();
                    }
                }
            }
            thread = null;
        }


        class ColoredSquare implements Icon {
            Color color;
            public ColoredSquare(Color c) {
                this.color = c;
            }
    
            public void paintIcon(Component c, Graphics g, int x, int y) {
                Color oldColor = g.getColor();
                g.setColor(color);
                g.fill3DRect(x,y,getIconWidth(), getIconHeight(), true);
                g.setColor(oldColor);
            }
            public int getIconWidth() { return 12; }
            public int getIconHeight() { return 12; }
        } // End ColoredSquare class
    } // End DemoControls
} // End Gradient class