text.java

java2d的源码分析

/*
 * @(#)Text.java	1.22 99/04/23
 *
 * Copyright (c) 1998, 1999 by Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 * 
 * 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 SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING 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.
 * 
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */

package demos.Clipping;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.geom.Line2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.font.TextLayout;
import java.awt.font.FontRenderContext;
import javax.swing.*;
import DemoSurface;
import DemoPanel;
import CustomControls;


/**
 * Clipping an image, lines, text, texture and gradient with text.
 */
public class Text extends DemoSurface implements CustomControls {

    static Image img;
    static TexturePaint texture;
    static {
        BufferedImage bi = new BufferedImage(5, 5, BufferedImage.TYPE_INT_RGB);
        Graphics2D big = bi.createGraphics();
        big.setBackground(Color.yellow);
        big.clearRect(0,0,5,5);
        big.setColor(Color.red);
        big.fillRect(0,0,3,3);
        texture = new TexturePaint(bi,new Rectangle(0,0,5,5));
    }
    private String clipType = "Lines";
    private DemoControls controls;
    protected boolean doClip = true;


    public Text() {
        setBackground(Color.white);
        img = getImage("clouds.jpg");
        controls = new DemoControls(this);
    }


    public String[] getCustomControlsConstraints() {
        return new String[] { BorderLayout.NORTH };
    }


    public Component[] getCustomControls() {
        return new Component[] { (Component) controls };
    }


    public void customControlsThread(int state) {
        if (state == CustomControls.START) {
            controls.start();
        } else if (state == CustomControls.STOP) {
            controls.stop();
        }
    }



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

        FontRenderContext frc = g2.getFontRenderContext();
        Font f = new Font("sansserif",Font.BOLD,32);
        String s = new String("JAVA");
        TextLayout tl = new TextLayout(s, f, frc);
        double sw = tl.getBounds().getWidth();
        double sh = tl.getBounds().getHeight();
        double sx = (w-40)/sw;
        double sy = (h-40)/sh;
        AffineTransform Tx = AffineTransform.getScaleInstance(sx, sy);
        Shape shape = tl.getOutline(Tx);
        sw = shape.getBounds().getWidth();
        sh = shape.getBounds().getHeight();
        Tx = AffineTransform.getTranslateInstance(w/2-sw/2, h/2+sh/2);
        shape = Tx.createTransformedShape(shape);
        Rectangle r = shape.getBounds();

        if (doClip) {
            g2.clip(shape);
        }

        if (clipType.equals("Lines")) {
            g2.setColor(Color.black);
            g2.fill(r);
            g2.setColor(Color.yellow);
            g2.setStroke(new BasicStroke(1.5f));
            for (int j = r.y; j < r.y + r.height; j=j+3) {
                Line2D line = new Line2D.Float( (float) r.x, (float) j,
                                            (float) (r.x+r.width), (float) j);
                g2.draw(line);
            }
        } else if (clipType.equals("Image")) {
            g2.drawImage(img, r.x, r.y, r.width, r.height, null);
        } else if (clipType.equals("TP")) {
            g2.setPaint(texture);
            g2.fill(r);
        } else if (clipType.equals("GP")) {
            g2.setPaint(new GradientPaint(0,0,Color.blue,w,h,Color.yellow));
            g2.fill(r);
        } else if (clipType.equals("Text")) {
            g2.setColor(Color.black);
            g2.fill(shape.getBounds());
            g2.setColor(Color.cyan);
            f = new Font("serif",Font.BOLD,10);
            tl = new TextLayout("java", f, frc);
            sw = tl.getBounds().getWidth();
    
            int x = r.x;
            int y = (int) (r.y + tl.getAscent());
            sh = r.y + r.height;
            while ( y < sh ) {
                tl.draw(g2, x, y);
                if ((x += (int) sw) > (r.x+r.width)) {
                    x = r.x;
                    y += (int) tl.getAscent();
                }
            }
        }
        g2.setClip(new Rectangle(0, 0, w, h));

        g2.setColor(Color.gray);
        g2.draw(shape);
    }


    public static void main(String s[]) {
        Frame f = new Frame("Java2D Demo - Text");
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        });
        final DemoPanel dp = new DemoPanel(new Text());
        f.add("Center", dp);
        f.pack();
        f.setSize(new Dimension(400,300));
        f.show();
    }


    static class DemoControls extends JPanel implements ActionListener, Runnable {

        Text demo;
        JToolBar toolbar;
        Thread thread;

        public DemoControls(Text demo) {
            this.demo = demo;
            setBackground(Color.gray);
            add(toolbar = new JToolBar());
            toolbar.setFloatable(false);
            addTool("Clip", true);
            addTool("Lines", true);
            addTool("Image", false);
            addTool("TP", false);
            addTool("GP", false);
            addTool("Text", false);
            addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    if (thread == null) start(); else stop();
                }
            });
        }

        public void addTool(String str, boolean state) {
            JButton b = (JButton) toolbar.add(new JButton(str));
            b.setSelected(state);
            b.setBackground(state ? Color.green : Color.lightGray);
            b.addActionListener(this);
        }

        public void actionPerformed(ActionEvent e) {
            if (e.getSource().equals(toolbar.getComponentAtIndex(0))) {
                JButton b = (JButton) e.getSource();
                b.setSelected(demo.doClip = !demo.doClip);
                b.setBackground(b.isSelected() ? Color.green : Color.lightGray);
            } else {
                for (int i = 1; i < toolbar.getComponentCount(); i++) {
                    JButton b = (JButton) toolbar.getComponentAtIndex(i);
                    b.setBackground(Color.lightGray);
                }
                JButton b = (JButton) e.getSource();
                b.setBackground(Color.green);
                demo.clipType = b.getText();
            }
            demo.repaint();
        }

        public Dimension getPreferredSize() {
            return new Dimension(200,36);
        }


        public void start() {
            if (thread != null) {
                return;
            }
            thread = new Thread(this);
            thread.setPriority(Thread.MIN_PRIORITY);
            thread.setName("Clipping.Text DemoControls Thread");
            thread.start();
        }


        public synchronized void stop() {
            if (thread != null) {
                thread.interrupt();
            }
            thread = null;
            notifyAll();
        }


        public void run() {
            try { thread.sleep(1111); } catch (Exception e) { return; }
            Thread me = Thread.currentThread();
            while (thread == me) {
                for (int i = 1; i < toolbar.getComponentCount()-1; i++) {
                    ((JButton) toolbar.getComponentAtIndex(i)).doClick();
                    try {
                        thread.sleep(4444);
                    } catch (InterruptedException e) { return; }
                }
            }
            thread = null;
        }
    } // End DemoControls
} // End Text