在Java applet中淡入淡出效果
问题描述：
我正在制作带有节点和边缘的java applet图形。我想在点击一个节点时实现淡入淡出效果，但我不知道如何编写和实现代码。为了澄清，例如动物节点检索老虎和狮子节点。所以当点击动物时，节点和附着的边缘逐渐消失，老虎和狮子节点逐渐出现。在Java applet中淡入淡出效果
预先感谢您
答
你需要写一个动画循环。每次通过循环改变边缘和/或节点的颜色。您可以使用Alpha淡入淡出或淡入淡出来背景。如果您搜索“java小程序动画循环”，网上有很多教程。一篇好文章是here。
+0
如果循环你的意思是一个计时器，那么是的。但是OP绝对不应该使用他/她自己的循环。 – MeBigFatGuy 2011-05-29 03:42:00
答
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);
}
}
我假设你有线程知识？顺序淡出节点将是灾难性的！ – AlanFoster 2011-05-29 03:22:36
@userNNNN“在java applet中淡入淡出效果”将在applet中以与在应用程序中完成相同的方式完成。顺便说一句 - 你有问题吗？ – 2011-05-29 03:54:59