我想让这两段代码一起工作，但我遇到了问题。第一部分代码构建了由我的编辑器（Netbeans GUI Builder for Java）生成的表单，不确定这是否是导致问题的原因。
当我运行项目时，我的代码（第二个代码块）运行并反转图像的颜色（确切地说它应该做什么），然后它恢复到原始图像（非 - 不应该发生，图像应该在面板中显示为非反转图像。然后，当我单击框架边框重新调整大小时，面板图像闪烁为反转，然后非反转，然后反转。再次点击它会做同样的事情，但在非倒置时停止。造成这个奇怪问题的原因是什么？
package weblaftest;
/**
*
* @author Ryan
*/
public class Main extends javax.swing.JFrame{
/**
* Creates new form Main
*/
public Main(){
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jInternalFrame1 = new javax.swing.JInternalFrame();
test1 = new weblaftest.test();
jInternalFrame1.setVisible(true);
javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
jInternalFrame1Layout.setHorizontalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jInternalFrame1Layout.setVerticalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout test1Layout = new javax.swing.GroupLayout(test1);
test1.setLayout(test1Layout);
test1Layout.setHorizontalGroup(
test1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 409, Short.MAX_VALUE)
);
test1Layout.setVerticalGroup(
test1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 362, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(test1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(262, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(83, Short.MAX_VALUE)
.addComponent(test1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(74, 74, 74))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]){
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try{
for(javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()){
if("Nimbus".equals(info.getName())){
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
}catch(ClassNotFoundException ex){
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}catch(InstantiationException ex){
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}catch(IllegalAccessException ex){
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}catch(javax.swing.UnsupportedLookAndFeelException ex){
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable(){
@Override
public void run(){
new Main().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JInternalFrame jInternalFrame1;
private weblaftest.test test1;
// End of variables declaration
}
这部分就是我写的，它是显示图像的面板代码，出于测试目的，所有它都反转了面板中显示的图像上的颜色。
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package weblaftest;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import weblaftest.grapics.Colors;
/**
*
* @author Ryan
*/
public class test extends javax.swing.JPanel{
private BufferedImage image;
/**
* Creates new form test
*/
public test(){
try{
image = ImageIO.read(new File("/Users/Public/Pictures/Sample Pictures/Chrysanthemum.jpg"));
}catch(IOException e){
}
}
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
int width = image.getWidth();
int height = image.getHeight();
for(int x = 0; x < width; x++){
for(int y = 0; y < height; y++){
int color = image.getRGB(x, y);
int red = Colors.red(color);
int green = Colors.green(color);
int blue = Colors.blue(color);
int rgb = Colors.rgba(255 - red, 255 - green, 255 - blue);
image.setRGB(x, y, rgb);
}
}
g.drawImage(image, 0, 0, width, height, Color.black, null);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
}// </editor-fold>
// Variables declaration - do not modify
// End of variables declaration
}
这是请求的Colors类：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package weblaftest.grapics;
/**
*
* @author Ryan
*/
public class Colors{
public static int rgba(int red, int green, int blue, Integer alpha){
int rgba = alpha;
rgba = (rgba << 8) + red;
rgba = (rgba << 8) + green;
rgba = (rgba << 8) + blue;
return rgba;
}
public static int rgba(int red, int green, int blue){
int rgba = 255;
rgba = (rgba << 8) + red;
rgba = (rgba << 8) + green;
rgba = (rgba << 8) + blue;
return rgba;
}
public static int alpha(int color){
return color >> 24 & 0x0FF;
}
public static int red(int color){
return color >> 16 & 0x0FF;
}
public static int green(int color){
return color >> 8 & 0x0FF;
}
public static int blue(int color){
return color & 0x0FF;
}
}
答案 0 :(得分：1)
paintComponent()用于绘制，不应在paintComponent(..) Test 问题在于：
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
int width = image.getWidth();
int height = image.getHeight();
for(int x = 0; x < width; x++){
for(int y = 0; y < height; y++){
int color = image.getRGB(x, y);
int red = Colors.red(color);
int green = Colors.green(color);
int blue = Colors.blue(color);
int rgb = Colors.rgba(255 - red, 255 - green, 255 - blue);
image.setRGB(x, y, rgb);
}
}
g.drawImage(image, 0, 0, width, height, Color.black, null);
}
在第一次调用BufferedImage时，在连续调用时绘制反转paintComponent()，它将重新转换并每次反转。
反过来反转构造函数中的BufferedImage并仅绘制BufferedImage中的倒置paintComponent(..)不要在paintComponent(..)中反转，因此在反转和原始图像之间切换为{ {1}}重新调整大小：
JFrame