java 如何让以下代码画图流畅,而不是断断续续,因双缓冲没学,尽量在以下代码基础上该把,求大师指点
//设计如下GUI,在JFrame元件中鼠标拖拽的轨迹可以写文字打草稿importjava.awt.*;importjava.awt.event.*;importjava...
//设计如下GUI,在JFrame元件中鼠标拖拽的轨迹可以写文字打草稿
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame{
private Container c;
private JLabel label;
private MyPaint myPaint;
public Test(){
super("草稿面板");
label=new JLabel("草稿面板",JLabel.CENTER); //文本居中
c=getContentPane();
myPaint=new MyPaint();
label.setFont(new Font("Serif",Font.BOLD,22)); //设置组件文字大小
c.setLayout(new BorderLayout());
c.add(label,BorderLayout.NORTH);
c.add(myPaint,BorderLayout.CENTER);
setBounds(200,200,500,500);
setVisible(true);
}
public static void main(String args[]){
Test app=new Test();
app.addWindowListener(new MyWindowListener());
}
}
class MyPaint extends JPanel{
private int x=0,y=0;
private int nx=0,ny=0;
private Point startPoint=new Point(x,y);
private Point endPoint=new Point(nx,ny);
public MyPaint(){
addMouseMotionListener(new MyMouseMotionListener());
addMouseListener(new MyMouseListener());
}
public void paint(Graphics g){
//super.paint(g); 添加后画面会重绘
//g.drawLine((int)startPoint.getX(),(int)startPoint.getY(),(int)endPoint.getX(),(int)endPoint.getY()); 画线
g.fillRect((int)startPoint.getX(),(int)startPoint.getY(),5,5);
}
//拖拽侦听
class MyMouseMotionListener extends MouseMotionAdapter{
public void mouseDragged(MouseEvent e){
startPoint=e.getPoint();
repaint();
}
public void mouseMoved(MouseEvent e){
}
}
//鼠标单击侦听
class MyMouseListener extends MouseAdapter{
public void mousePressed(MouseEvent e){
startPoint=e.getPoint();
repaint();
}
public void mouseReleased(MouseEvent e){
endPoint=e.getPoint();
repaint();
}
}
}
左图为教材,右图为我的代码,画快了感觉侦听跟不上来,不知道什么原因。 展开
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame{
private Container c;
private JLabel label;
private MyPaint myPaint;
public Test(){
super("草稿面板");
label=new JLabel("草稿面板",JLabel.CENTER); //文本居中
c=getContentPane();
myPaint=new MyPaint();
label.setFont(new Font("Serif",Font.BOLD,22)); //设置组件文字大小
c.setLayout(new BorderLayout());
c.add(label,BorderLayout.NORTH);
c.add(myPaint,BorderLayout.CENTER);
setBounds(200,200,500,500);
setVisible(true);
}
public static void main(String args[]){
Test app=new Test();
app.addWindowListener(new MyWindowListener());
}
}
class MyPaint extends JPanel{
private int x=0,y=0;
private int nx=0,ny=0;
private Point startPoint=new Point(x,y);
private Point endPoint=new Point(nx,ny);
public MyPaint(){
addMouseMotionListener(new MyMouseMotionListener());
addMouseListener(new MyMouseListener());
}
public void paint(Graphics g){
//super.paint(g); 添加后画面会重绘
//g.drawLine((int)startPoint.getX(),(int)startPoint.getY(),(int)endPoint.getX(),(int)endPoint.getY()); 画线
g.fillRect((int)startPoint.getX(),(int)startPoint.getY(),5,5);
}
//拖拽侦听
class MyMouseMotionListener extends MouseMotionAdapter{
public void mouseDragged(MouseEvent e){
startPoint=e.getPoint();
repaint();
}
public void mouseMoved(MouseEvent e){
}
}
//鼠标单击侦听
class MyMouseListener extends MouseAdapter{
public void mousePressed(MouseEvent e){
startPoint=e.getPoint();
repaint();
}
public void mouseReleased(MouseEvent e){
endPoint=e.getPoint();
repaint();
}
}
}
左图为教材,右图为我的代码,画快了感觉侦听跟不上来,不知道什么原因。 展开
1个回答
展开全部
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | import java.awt.*; import java.awt.event.*; import javax.swing.*; public class DrawDemo extends JFrame { private Container c; private JLabel label; private MyPaint myPaint; public DrawDemo() { super ( "草稿面板" ); label = new JLabel( "草稿面板" , JLabel.CENTER); // 文本居中 c = getContentPane(); myPaint = new MyPaint(); label.setFont( new Font( "Serif" , Font.BOLD, 22 )); // 设置组件文字大小 c.setLayout( new BorderLayout()); c.add(label, BorderLayout.NORTH); c.add(myPaint, BorderLayout.CENTER); setBounds( 200 , 200 , 500 , 500 ); setVisible( true ); } public static void main(String args[]) { DrawDemo app = new DrawDemo(); } } class MyPaint extends JPanel { private int x = 0 , y = 0 ; private int nx = 0 , ny = 0 ; private Point startPoint = new Point(x, y); private Point endPoint = new Point(nx, ny); public MyPaint() { addMouseMotionListener( new MyMouseMotionListener()); addMouseListener( new MyMouseListener()); } public void paint(Graphics g) { g.drawLine(( int ) startPoint.getX(), ( int ) startPoint.getY(), ( int ) endPoint.getX(), ( int ) endPoint.getY()); startPoint = endPoint; } // 拖拽侦听 class MyMouseMotionListener extends MouseMotionAdapter { public void mouseDragged(MouseEvent e) { endPoint = e.getPoint(); repaint(); } public void mouseMoved(MouseEvent e) { endPoint = e.getPoint(); } } // 鼠标单击侦听 class MyMouseListener extends MouseAdapter { public void mousePressed(MouseEvent e) { startPoint = e.getPoint(); } } } |
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询