tree.java

这是ACCP的JAVA ppt课件

/*
 * Copyright (c) 2003 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.
 * 
 * -Redistribution in binary form must reproduct 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 AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE 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 SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)Tree.java	1.24 03/01/23
 */

package java2d.demos.Fonts;

import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java2d.AnimatingSurface;


/**
 * Transformation of characters.
 */
public class Tree extends AnimatingSurface {

    private char theC = 'A';
    private Character theT = new Character(theC);
    private Character theR = new Character((char) ((int) theC + 1));


    public Tree() {
        setBackground(Color.white);
    }


    public void reset(int w, int h) { }


    public void step(int w, int h) {
        setSleepAmount(4000);
        theT = new Character(theC = ((char) ((int) theC + 1)));
        theR = new Character((char) ((int) theC + 1));
        if (theR.compareTo(new Character('z')) == 0) {
            theC = 'A';
        }
    }


    public void render(int w, int h, Graphics2D g2) {
        int mindim = Math.min(w, h);
        AffineTransform at = new AffineTransform();
        at.translate((w - mindim) / 2.0,
                     (h - mindim) / 2.0);
        at.scale(mindim, mindim);
        at.translate(0.5, 0.5);
        at.scale(0.3, 0.3);
        at.translate(-(Twidth + Rwidth), FontHeight / 4.0);
        g2.transform(at);
        tree(g2, mindim * 0.3, 0);

    }


    static Font theFont = new Font("serif", Font.PLAIN, 1);
    static double Twidth = 0.6;
    static double Rwidth = 0.6;
    static double FontHeight = 0.75;
    static Color colors[] = {Color.blue,
                             Color.red.darker(),
                             Color.green.darker()};


    public void tree(Graphics2D g2d, double size, int phase) {
        g2d.setColor(colors[phase % 3]);
        new TextLayout(theT.toString(),theFont,g2d.getFontRenderContext()).draw(g2d, 0.0f, 0.0f);
        if (size > 10.0) {
            AffineTransform at = new AffineTransform();
            at.setToTranslation(Twidth, -0.1);
            at.scale(0.6, 0.6);
            g2d.transform(at);
            size *= 0.6;
            new TextLayout(theR.toString(),theFont, g2d.getFontRenderContext()).draw(g2d, 0.0f, 0.0f);
            at.setToTranslation(Rwidth+0.75, 0);
            g2d.transform(at);
            Graphics2D g2dt = (Graphics2D) g2d.create();
            at.setToRotation(-Math.PI / 2.0);
            g2dt.transform(at);
            tree(g2dt, size, phase + 1);
            g2dt.dispose();
            at.setToTranslation(.75, 0);
            at.rotate(-Math.PI / 2.0);
            at.scale(-1.0, 1.0);
            at.translate(-Twidth, 0);
            g2d.transform(at);
            tree(g2d, size, phase);
        }
        g2d.setTransform(new AffineTransform());
    }


    public static void main(String argv[]) {
        createDemoFrame(new Tree());
    }
}