所以，我有这个项目，你可以在里面画图。我希望人们能够在它上面画画，但是一开始我使用的时候它太慢了repaint()所以我使用了这个repaint(Rectangle r)工具。它更好，但仍然不是我想要的速度。这是代码：
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();
}
}
}