fadeanim.java

java2d的源码分析

        }
    }


    public static void main(String argv[]) {
        final DemoPanel dp = new DemoPanel(new FadeAnim());
        Frame f = new Frame("Java2D Demo - FadeAnim");
        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 TextData extends Object {

	public String string;
        public Font font;
        public int width, height;

        public TextData(String str, Font font, Component cmp) {
            string = str;
            this.font = font;
            FontMetrics fm = cmp.getFontMetrics(font);
            width = fm.stringWidth(str);
            height = fm.getHeight();
        }
    }


    static class ObjectData extends Object {
        final int UP = 0;
        final int DOWN = 1;
        Object object;
        BufferedImage bimg;
        Paint paint;
        double x, y;
        float alpha;
        int alphaDirection;
        int imgX;

        public ObjectData(Object object, Paint paint) {
            this.object = object;
            this.paint = paint;
            if (object instanceof BufferedImage) {
                bimg = (BufferedImage) object;
                this.object = bimg.getSubimage(0, 0, 80, 80);    
            }
            getRandomXY(300, 250);
            alpha = (float) Math.random();
            alphaDirection = Math.random() > 0.5 ? UP : DOWN;
        }


        private void getRandomXY(int w, int h) {
            if (object instanceof TextData) {
                x = Math.random() * (w - ((TextData) object).width);
                y = Math.random() * h;
                y = y < ((TextData) object).height ? ((TextData) object).height : y;
            } else if (object instanceof Image) {
                x = Math.random() * (w - ((Image) object).getWidth(null));
                y = Math.random() * (h - ((Image) object).getHeight(null));
            } else if (object instanceof Shape) {
                Rectangle bounds = ((Shape) object).getBounds();
                x = Math.random() * (w - bounds.width);
                y = Math.random() * (h - bounds.height);
            }
        }


        public void reset(int w, int h) {
            getRandomXY(w, h);
            double ww = 20 + Math.random()*((w == 0 ? 400 : w)/4);
            double hh = 20 + Math.random()*((h == 0 ? 300 : h)/4);
            if (object instanceof Ellipse2D) {
                ((Ellipse2D) object).setFrame(0, 0, ww, hh);
            } else if (object instanceof Rectangle2D) {
                ((Rectangle2D) object).setRect(0, 0, ww, ww);
            } else if (object instanceof RoundRectangle2D) {
                ((RoundRectangle2D) object).setRoundRect(0, 0, hh, hh, 20, 20); 
            } else if (object instanceof Arc2D) {
                ((Arc2D) object).setArc(0, 0, hh, hh, 45, 270, Arc2D.PIE);
            } else if (object instanceof QuadCurve2D) {
                ((QuadCurve2D) object).setCurve(0, 0, w*.2, h*.4, w*.4, 0);
            } else if (object instanceof CubicCurve2D) {
                    ((CubicCurve2D) object).setCurve(0,0,30,-60,60,60,90,0);
            } else if (object instanceof GeneralPath) {
                GeneralPath p = new GeneralPath();
                float size = (float) ww;
                p.moveTo(- size / 2.0f, - size / 8.0f);
                p.lineTo(+ size / 2.0f, - size / 8.0f);
                p.lineTo(- size / 4.0f, + size / 2.0f);
                p.lineTo(+         0.0f, - size / 2.0f);
                p.lineTo(+ size / 4.0f, + size / 2.0f);
                p.closePath();
                object = p;
            }
        }


        public void step(int w, int h) {
            if (object instanceof BufferedImage) {
                if ((imgX += 80) == 800) {
                    imgX = 0;
                }
                object = bimg.getSubimage(imgX, 0, 80, 80);    
            }
            if (alphaDirection == UP) {
                if ((alpha += 0.05) > .99) {
                    alphaDirection = DOWN;
                    alpha = 1.0f;
                }
            } else if (alphaDirection == DOWN) {
                if ((alpha -= .05) < 0.01) {
                    alphaDirection = UP;
                    alpha = 0;
                    getRandomXY(w, h);
                }
            }
        }
    }


    static class DemoControls extends JPanel implements ChangeListener, Runnable {

        FadeAnim demo;
        JSlider shapeSlider, stringSlider, imageSlider;
        Thread thread;
        Font font = new Font("serif", Font.PLAIN, 10);

        public DemoControls(FadeAnim demo) {
            this.demo = demo;
            setBackground(Color.gray);
            setLayout(new BorderLayout());
            JToolBar toolbar = new JToolBar(JToolBar.VERTICAL);
            toolbar.setBackground(Color.gray);
            toolbar.setFloatable(false);
            shapeSlider = new JSlider(JSlider.HORIZONTAL,0,20,demo.numShapes);
            shapeSlider.addChangeListener(this);
            TitledBorder tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numShapes) + " Shapes");
            shapeSlider.setBorder(tb);
            shapeSlider.setPreferredSize(new Dimension(80,45));
            toolbar.addSeparator();
            toolbar.add(shapeSlider);
            toolbar.addSeparator();

            stringSlider = new JSlider(JSlider.HORIZONTAL,0,10,demo.numStrings);
            stringSlider.addChangeListener(this);
            tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numStrings) + " Strings");
            stringSlider.setBorder(tb);
            stringSlider.setPreferredSize(new Dimension(80,45));
            toolbar.add(stringSlider);
            toolbar.addSeparator();

            imageSlider = new JSlider(JSlider.HORIZONTAL,0,10,demo.numImages);
            imageSlider.addChangeListener(this);
            tb = new TitledBorder(new EtchedBorder());
            tb.setTitleFont(font);
            tb.setTitle(String.valueOf(demo.numImages) + " Images");
            imageSlider.setBorder(tb);
            imageSlider.setPreferredSize(new Dimension(80,45));
            toolbar.add(imageSlider);
            toolbar.addSeparator();

            add(toolbar);

            toolbar.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    if (thread == null) start(); else stop();
                }
            });
        }


        public void stateChanged(ChangeEvent e) {
            JSlider slider = (JSlider) e.getSource();
            int value = slider.getValue();
            TitledBorder tb = (TitledBorder) slider.getBorder();
            if (slider.equals(shapeSlider)) {
                tb.setTitle(String.valueOf(value) + " Shapes");
                demo.setShapes(value);
            } else if (slider.equals(stringSlider)) {
                tb.setTitle(String.valueOf(value) + " Strings");
                demo.setStrings(value);
            } else if (slider.equals(imageSlider)) {
                tb.setTitle(String.valueOf(value) + " Images");
                demo.setImages(value);
            } 
            slider.repaint();
            if (demo.thread == null) {
                demo.repaint();
            }
        }


        public Dimension getPreferredSize() {
            return new Dimension(80,0);
        }


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


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


        public void run() {
            try { 
               thread.sleep(999);
            } catch (InterruptedException e) { return; }
            shapeSlider.setValue((int) (Math.random() * 5));
            stringSlider.setValue(10);
            thread = null;
        }


    } // End DemoControls
} // End FadeAnim