/* * @(#)BezierScroller.java	1.27 99/08/16 * * 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.Mix;import java.awt.*;import java.awt.event.*;import java.awt.geom.GeneralPath;import java.awt.geom.PathIterator;import java.awt.font.FontRenderContext;import java.awt.font.TextLayout;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileReader;import java.io.BufferedReader;import java.util.Vector;import javax.swing.*;import AnimatingContext;import DemoSurface;import DemoPanel;import CustomControls;/** * Animated Bezier Curve shape with images at the control points. * README.txt file scrolling up. Composited Image fading in and out. */public class BezierScroller extends DemoSurface implements AnimatingContext, CustomControls {    private static String appletStrs[] =         {  " ", "Java2Demo",             "BezierScroller - Animated Bezier Curve shape with images",            "For README.txt file scrolling run in application mode", " " };    private static final int NUMPTS = 6;    private static Color greenBlend = new Color(0, 255, 0, 100);    private static Font font = new Font("serif", Font.PLAIN, 12);    private static Color blueBlend = new Color(0, 0, 255, 100);    private static BasicStroke bs = new BasicStroke(3.0f);    private static Image hotj_img;    private static BufferedImage img;    private static final int UP = 0;    private static final int DOWN = 1;    private float animpts[] = new float[NUMPTS * 2];    private float deltas[] = new float[NUMPTS * 2];    private BufferedReader reader;          private int nStrs;              private int strH;    private int yy, ix, iy, imgX;    private Vector vector, appletVector;    private float alpha = 0.2f;    private int alphaDirection;    private DemoControls controls;    protected boolean doImage, doShape, doText;    protected boolean buttonToggle;    public BezierScroller() {        setBackground(Color.white);        doShape = doText = true;        hotj_img = getImage("HotJava-16.gif");        Image image = getImage("jumptojavastrip.gif");        int iw = image.getWidth(this);        int ih = image.getHeight(this);        img = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB);        img.createGraphics().drawImage(image, 0, 0, this);        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 animate(float[] pts, float[] deltas, int index, int limit) {        float newpt = pts[index] + deltas[index];        if (newpt <= 0) {            newpt = -newpt;            deltas[index] = (float) (Math.random() * 4.0 + 2.0);        } else if (newpt >= (float) limit) {            newpt = 2.0f * limit - newpt;            deltas[index] = - (float) (Math.random() * 4.0 + 2.0);        }        pts[index] = newpt;    }    public void getFile() {        try {            File file = new File("README.txt");            if ((reader = new BufferedReader(new FileReader(file))) != null) {                getLine();            }        } catch (Exception e) { reader = null; }        if (reader == null) {            appletVector = new Vector(100);            for (int i = 0; i < 100; i++) {                appletVector.addElement(appletStrs[i%appletStrs.length]);            }            getLine();        }        buttonToggle = true;    }    public String getLine() {        String str = null;        if (reader != null) {            try {                if ((str = reader.readLine()) != null) {                    if (str.length() == 0) {                        str = " ";                    }                    vector.addElement(str);                }            } catch (Exception e) { e.printStackTrace(); reader = null; }        } else {            if (appletVector.size() != 0) {                vector.addElement(str = (String) appletVector.remove(0));            }        }        return str;    }    public void reset(int w, int h) {        for (int i = 0; i < animpts.length; i += 2) {            animpts[i + 0] = (float) (Math.random() * w);            animpts[i + 1] = (float) (Math.random() * h);            deltas[i + 0] = (float) (Math.random() * 6.0 + 4.0);            deltas[i + 1] = (float) (Math.random() * 6.0 + 4.0);            if (animpts[i + 0] > w / 2.0f) {                deltas[i + 0] = -deltas[i + 0];            }            if (animpts[i + 1] > h / 2.0f) {                deltas[i + 1] = -deltas[i + 1];            }        }        FontMetrics fm = getFontMetrics(font);        strH = fm.getAscent()+fm.getDescent();        nStrs = h/strH+1;        vector = new Vector(nStrs);        ix = (int) (Math.random() * (w - 80));        iy = (int) (Math.random() * (h - 80));    }    public void step(int w, int h) {        if (doText && vector.size() == 0) {            getFile();        }        if (doText) {            String s = getLine();            if (s == null || vector.size() == nStrs && vector.size() != 0) {                vector.removeElementAt(0);            }            yy = (s == null) ? strH : h - ((vector.size()-1) * strH);        }               for (int i = 0; i < animpts.length && doShape; i += 2) {            animate(animpts, deltas, i + 0, w);            animate(animpts, deltas, i + 1, h);        }        if (doImage && alphaDirection == UP) {            if ((alpha += 0.025) > .99) {                alphaDirection = DOWN;                alpha = 1.0f;            }        } else if (doImage && alphaDirection == DOWN) {            if ((alpha -= .02) < 0.01) {                alphaDirection = UP;                alpha = 0;                ix = (int) (Math.random() * (w - 80));                iy = (int) (Math.random() * (h - 80));            }        }        if (doImage) {            if ((imgX += 80) == 800) {                imgX = 0;            }        }    }    public void drawDemo(int w, int h, Graphics2D g2) {        if (doText) {            g2.setColor(Color.lightGray);            g2.setFont(font);            float y = yy;            for (int i = 0; i < vector.size(); i++) {                g2.drawString((String)vector.get(i), 1, y);                y += strH;            }        }        if (doShape) {            float[] ctrlpts = animpts;            int len = ctrlpts.length;            float prevx = ctrlpts[len - 2];            float prevy = ctrlpts[len - 1];            float curx = ctrlpts[0];            float cury = ctrlpts[1];            float midx = (curx + prevx) / 2.0f;            float midy = (cury + prevy) / 2.0f;            GeneralPath gp = new GeneralPath(GeneralPath.WIND_NON_ZERO);            gp.moveTo(midx, midy);            for (int i = 2; i <= ctrlpts.length; i += 2) {                float x1 = (midx + curx) / 2.0f;                float y1 = (midy + cury) / 2.0f;                prevx = curx;                prevy = cury;                if (i < ctrlpts.length) {                    curx = ctrlpts[i + 0];                    cury = ctrlpts[i + 1];                } else {                    curx = ctrlpts[0];                    cury = ctrlpts[1];                }                midx = (curx + prevx) / 2.0f;                midy = (cury + prevy) / 2.0f;                float x2 = (prevx + midx) / 2.0f;                float y2 = (prevy + midy) / 2.0f;                gp.curveTo(x1, y1, x2, y2, midx, midy);            }            gp.closePath();            g2.setColor(blueBlend);            g2.setStroke(bs);            g2.draw(gp);            g2.setColor(greenBlend);            g2.fill(gp);            PathIterator pi = gp.getPathIterator(null);            float pts[] = new float[6];            while ( !pi.isDone() ) {                if (pi.currentSegment(pts) == pi.SEG_CUBICTO) {                    g2.drawImage(hotj_img, (int) pts[0], (int) pts[1], this);                }                pi.next();            }        }        if (doImage) {            AlphaComposite ac = AlphaComposite.getInstance(                                   AlphaComposite.SRC_OVER, alpha);            g2.setComposite(ac);            g2.drawImage(img.getSubimage(imgX,0,80,80), ix, iy, this);        }    }    public static void main(String argv[]) {        final DemoPanel dp = new DemoPanel(new BezierScroller());        Frame f = new Frame("Java2D Demo - BezierScroller");        f.addWindowListener(new WindowAdapter() {            public void windowClosing(WindowEvent e) {System.exit(0);}            public void windowDeiconified(WindowEvent e) {                 dp.surface.start();             }            public void windowIconified(WindowEvent e) {                 dp.surface.stop();             }        });        f.add("Center", dp);        f.pack();        f.setSize(new Dimension(400,300));        f.show();        dp.surface.start();    }    static class DemoControls extends JPanel implements ActionListener, Runnable {        BezierScroller demo;        JToolBar toolbar;        JComboBox combo;        Thread thread;        public DemoControls(BezierScroller demo) {            this.demo = demo;            setBackground(Color.gray);            add(toolbar = new JToolBar());            toolbar.setFloatable(false);            addTool("Image", false);            addTool("Shape", true);            addTool("Text", true);            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.setBackground(state ? Color.green : Color.lightGray);            b.setSelected(state);            b.addActionListener(this);        }        public void actionPerformed(ActionEvent e) {            JButton b = (JButton) e.getSource();            b.setSelected(!b.isSelected());            b.setBackground(b.isSelected() ? Color.green : Color.lightGray);            if (b.getText().equals("Image")) {                demo.doImage = b.isSelected();            } else if (b.getText().equals("Shape")) {                demo.doShape = b.isSelected();            } else {                demo.doText = b.isSelected();            }            if (demo.thread == null) {                demo.repaint();            }        }        public Dimension getPreferredSize() {            return new Dimension(200,37);        }        public void start() {            if (thread != null) {                return;            }            thread = new Thread(this);            thread.setPriority(Thread.MIN_PRIORITY);            thread.setName("Mix.BezierScroller DemoControls Thread");            thread.start();        }        public synchronized void stop() {            if (thread != null) {                thread.interrupt();            }            thread = null;            notifyAll();        }        public void run() {            Thread me = Thread.currentThread();            int i = 0;            while (thread == me) {                try {                    thread.sleep(250);                } catch (InterruptedException e) { return; }                if (demo.buttonToggle) {                    ((JButton) toolbar.getComponentAtIndex(i++%2)).doClick();                    demo.buttonToggle = false;                }            }            thread = null;        }    } // End DemoControls} // End BezierScroller