绘图图形太慢了 [英] Drawing Graphics is too slow

问题描述

所以，我有这个项目，你可以在里面画图。我希望人们能够使用它，但起初它太慢，当我使用 repaint（）所以我用 repaint（ Rectangle r）工具。这更好，但仍然不是我想要的速度。
这里是代码：

  import java.awt。*; 
 import java.awt.event。*; 
 import javax.swing。*; 
 import javax.swing.event。*; 
 
 
 public class DrawingPad扩展JPanel实现MouseListener，MouseMotionListener，ListSelectionListener {
 public Color [] [] picture = new Color [601] [601]; 
选择了公共颜色; 
 public String action; 
 public Maker m; 
 private static final long serialVersionUID = 1L; 
 public DrawingPad（Maker m）{
 this.m = m; 
 this.setPreferredSize（new Dimension（600,600））; 
 this.setVisible（true）; （int y = 1; y< = 600; y ++）{
 picture [x] [y] =（
 for（int x = 1; x <= 600; x ++）白颜色; 
 
 
 $ b $ public void addColor（int x，int y）{
 try {
 picture [x] [y] = selected; 
 repaint（new Rectangle（x，y，x，y））; 
} catch（Exception e）{
 
} 
} 
 @Override 
 public void paintComponent（Graphics g）{
 super.paintComponent （G）; 
 g.clearRect（0，0，600，600）; （int y = 1; y< = 600; y ++）{
 g.setColor（picture [x]）的
（int x = 1; x <= 600; x ++） [Y]）; 
 g.drawLine（x，y，x，y）; 
} 
} 
} 
 @Override 
 public void mouseClicked（MouseEvent arg0）{
 // TODO自动生成的方法存根
 
} 
 @Override 
 public void mouseEntered（MouseEvent arg0）{
 // TODO自动生成的方法存根
 
} 
 @Override 
 public void mouseExited（MouseEvent arg0）{
 // TODO自动生成的方法存根
 
 $ b @Override 
 public void mousePressed（MouseEvent arg0）{ 
 // TODO自动生成方法存根
 
 $ b @Override 
 public void mouseReleased（MouseEvent arg0）{
 // TODO自动生成的方法stub 
 
 $ b @Override 
 public void mouseDragged（MouseEvent e）{
 for（int x = -1; x <= 1; x ++）{
 for（int y = -1; y< = 1; y ++）{
 this.addColor（e.getX（）+ x，e.getY（）+ y）; 
} 
} 
} 
 @Override 
 public void mouseMoved（MouseEvent arg0）{
 // TODO自动生成的方法存根
 
 
 @Override 
 public void valueChanged（ListSelectionEvent e）{
 if（e.getSource（）== m.seeit）{
 selected = m.colors [ m.seeit.getSelectedIndex（）]; 
} else {
 action =（String）m.actions.getSelectedValue（）; 
} 
 
} 
} 
  

解决方案

您可能想要查看哪些不会更改为BufferedImage的绘图，然后将paintComponent方法中的BufferedImage作为背景图像显示。

例如，请查看此链接以及这一个。

So, I have this project, and you can draw images in it. I wanted people to be able to draw on it, but at first it was too slow when I was using repaint() So i used the repaint(Rectangle r) tool. It's better, but still not the speed i was looking for. Here is the code:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;


public class DrawingPad extends JPanel implements MouseListener,MouseMotionListener,ListSelectionListener{
public Color[][] picture = new Color[601][601];
public Color selected;
public String action;
public Maker m;
private static final long serialVersionUID = 1L;
public DrawingPad(Maker m){
    this.m = m;
    this.setPreferredSize(new Dimension(600,600));
    this.setVisible(true);
    for (int x = 1;x<=600;x++){
        for (int y = 1; y<=600;y++){
            picture[x][y]=Color.WHITE;
        }
    }
}
public void addColor(int x, int y){
    try{
        picture[x][y]=selected;
        repaint(new Rectangle(x,y,x,y));
    }catch (Exception e){

    }
}
@Override
public void paintComponent(Graphics g){
    super.paintComponent(g);
    g.clearRect(0, 0, 600, 600);
    for (int x = 1;x<=600;x++){
        for (int y = 1; y<=600;y++){
            g.setColor(picture[x][y]);
            g.drawLine(x, y, x, y);
        }
    }
}
@Override
public void mouseClicked(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void mouseEntered(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void mouseExited(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void mousePressed(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void mouseReleased(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void mouseDragged(MouseEvent e) {
    for (int x = -1;x<=1;x++){
        for (int y = -1;y<=1;y++){
            this.addColor(e.getX()+x, e.getY()+y);
        }   
    }
}
@Override
public void mouseMoved(MouseEvent arg0) {
    // TODO Auto-generated method stub

}
@Override
public void valueChanged(ListSelectionEvent e) {
    if (e.getSource()==m.seeit){
        selected = m.colors[m.seeit.getSelectedIndex()];
    }else{
        action=(String) m.actions.getSelectedValue();
    }

}
}

解决方案

You might want to look into drawing that which will not be changed into a BufferedImage, and then displaying that BufferedImage in the paintComponent method as a background image.

For example, please have a look at this link and also this one.

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