在Java applet中淡入和淡出效果
我正在使用节点和边缘制作这个java applet图形。 我希望在单击一个节点时实现对新节点检索的淡入和淡出效果，但我不知道如何编写和实现代码。 为了澄清，例如动物节点检索虎和狮子节点。 因此，当点击动物时，节点和附着在其上的边缘逐渐消失，老虎和狮子节点逐渐出现。
先感谢您
此示例使用AlphaComposite进行淡入淡出。 或者，该示例基于饱和度组成颜色表。
你需要编写一个动画循环。 每次循环都会改变边缘和/或节点的颜色。 您可以使用Alpha淡入淡出或淡入淡出背景。 如果你搜索“java applet animation loop”，网上有很多教程。 这里有一篇好文章。
Dear Friend here is the code that helps your problem Kindly refer through it /*Arpana*/ import java.awt.*; import java.awt.event.*; import java.awt.image.*; import javax.swing.*; import java.awt.color.ColorSpace; import javax.swing.border.TitledBorder; public class ImageColorEffect extends JFrame implements ActionListener { DisplayPanel displayPanel; JRadioButton brightButton, darkButton, contrastIButton, contrastDButton, reverseButton, changeButton, resetButton; public ImageColorEffect() { super("Color Effect Example"); Container container = getContentPane(); container.setSize(500,500); displayPanel = new DisplayPanel(); container.add(displayPanel); JPanel panel = new JPanel(); panel.setLayout(new GridLayout(3, 2)); panel.setBorder(new TitledBorder("Click a Radio Button")); ButtonGroup group = new ButtonGroup(); brightButton = new JRadioButton("Brightness",false); panel.add(brightButton); group.add(brightButton); brightButton.addActionListener(this); darkButton = new JRadioButton("Darkness",false); panel.add(darkButton); group.add(darkButton); darkButton.addActionListener(this); contrastIButton = new JRadioButton("Contrast in",false); panel.add(contrastIButton); group.add(contrastIButton); contrastIButton.addActionListener(this); contrastDButton = new JRadioButton("Contrast de",false); panel.add(contrastDButton); group.add(contrastDButton); contrastDButton.addActionListener(this); reverseButton = new JRadioButton("Negative",false); panel.add(reverseButton); group.add(reverseButton); reverseButton.addActionListener(this); changeButton = new JRadioButton("ChangeColor",false); panel.add(changeButton); group.add(changeButton); changeButton.addActionListener(this); resetButton = new JRadioButton("Reset",false); panel.add(resetButton); group.add(resetButton); resetButton.addActionListener(this); container.add(BorderLayout.NORTH, panel); addWindowListener(new WindowEventHandler()); setSize(displayPanel.getWidth(), displayPanel.getHeight() + 25); show(); } class WindowEventHandler extends WindowAdapter { public void windowClosing(WindowEvent e) { System.exit(0); } } public static void main(String arg[]) { new ImageColorEffect(); } public void actionPerformed(ActionEvent e) { JRadioButton rbutton = (JRadioButton) e.getSource(); if (rbutton.equals(brightButton)) { displayPanel.brightenLUT(); displayPanel.applyFilter(); displayPanel.repaint(); } else if (rbutton.equals(darkButton)) { displayPanel.darkenLUT(); displayPanel.applyFilter(); displayPanel.repaint(); } else if (rbutton.equals(contrastIButton)) { displayPanel.contrastIncLUT(); displayPanel.applyFilter(); displayPanel.repaint(); } else if (rbutton.equals(contrastDButton)) { displayPanel.contrastDecLUT(); displayPanel.applyFilter(); displayPanel.repaint(); } else if (rbutton.equals(reverseButton)) { displayPanel.reverseLUT(); displayPanel.applyFilter(); displayPanel.repaint(); } else if (rbutton.equals(changeButton)) { displayPanel.repaint(); displayPanel.grayOut(); } else if (rbutton.equals(resetButton)) { displayPanel.reset(); displayPanel.repaint(); } } } class DisplayPanel extends JPanel { Image disImage; BufferedImage image; Graphics2D graph; LookupTable lookup; DisplayPanel() { setBackground(Color.black); loadImage(); setSize(disImage.getWidth(this), disImage.getWidth(this)); createBufferedImage(); } public void loadImage() { disImage = Toolkit.getDefaultToolkit().getImage( "Desert.jpg"); MediaTracker media = new MediaTracker(this); media.addImage(disImage, 1); try { media.waitForAll(); } catch (Exception e) {} if (disImage.getWidth(this) == -1) { System.out.println("file not found"); System.exit(0); } } public void createBufferedImage() { image = new BufferedImage(disImage.getWidth(this), disImage .getHeight(this), BufferedImage.TYPE_INT_ARGB); graph = image.createGraphics(); graph.drawImage(disImage, 0, 0, this); } public void brightenLUT() { short brighten[] = new short[256]; for (int i = 0; i < 256; i++) { short pixelValue = (short) (i + 10); if (pixelValue > 255) pixelValue = 255; else if (pixelValue < 0) pixelValue = 0; brighten[i] = pixelValue; } lookup = new ShortLookupTable(0, brighten); } public void darkenLUT() { short brighten[] = new short[256]; for (int i = 0; i < 256; i++) { short pixelValue = (short) (i - 10); if (pixelValue > 255) pixelValue = 255; else if (pixelValue < 0) pixelValue = 0; brighten[i] = pixelValue; } lookup = new ShortLookupTable(0, brighten); } public void contrastIncLUT() { short brighten[] = new short[256]; for (int i = 0; i < 256; i++) { short pixelValue = (short) (i * 1.2); if (pixelValue > 255) pixelValue = 255; else if (pixelValue < 0) pixelValue = 0; brighten[i] = pixelValue; } lookup = new ShortLookupTable(0, brighten); } public void contrastDecLUT() { short brighten[] = new short[256]; for (int i = 0; i < 256; i++) { short pixelValue = (short) (i / 1.2); if (pixelValue > 255) pixelValue = 255; else if (pixelValue < 0) pixelValue = 0; brighten[i] = pixelValue; } lookup = new ShortLookupTable(0, brighten); } public void reverseLUT() { byte reverse[] = new byte[256]; for (int i = 0; i < 256; i++) { reverse[i] = (byte) (255 - i); } lookup = new ByteLookupTable(0, reverse); } public void reset() { graph.setColor(Color.black); graph.clearRect(0, 0, image.getWidth(this), image.getHeight(this)); graph.drawImage(disImage, 0, 0, this); } public void grayOut() { ColorConvertOp colorConvert = new ColorConvertOp(ColorSpace .getInstance(ColorSpace.CS_GRAY), null); colorConvert.filter(image, image); } public void applyFilter() { LookupOp lop = new LookupOp(lookup, null); lop.filter(image, image); } public void update(Graphics g) { g.clearRect(0, 0, getWidth(), getHeight()); paintComponent(g); } public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2D = (Graphics2D) g; g2D.drawImage(image, 0, 0, this); } }