Question

小弟菜鸟一枚java鼠标跟随问题，我想让下面代码在鼠标“快速”移动时画完整的线，不是断断续续的哟！

package com.jlchaoshi.test;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;

public class MouseDrawLine extends JFrame {

int x, y;
int endX, endY;

public MouseDrawLine() {
addMouseListener(new MouseAdapter() {
//鼠标下压事件
public void mousePressed(MouseEvent e) {
x = e.getX();
y = e.getY();
}
//鼠标弹起事件
public void mouseReleased(MouseEvent e) {
System.out.println("鼠标弹起事件");
}
});

addMouseMotionListener(new MouseMotionAdapter() {
//鼠标下压移动事件
public void mouseDragged(MouseEvent e) {
endX = e.getX();
endY = e.getY();
repaint();
x = endX+1;
y = endY+1;
}
});

setSize(600, 500);
setLocation(200,100);
setVisible(true);
}

public void paint(Graphics g) {
g.setColor(Color.black);
g.drawLine(x, y, endX, endY);
}

public static void main(String[] args) {
new MouseDrawLine();
}
}

Answer 1

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;

public class MouseDrawLine extends JFrame {
	
	int x, y;
	int endX, endY;

	public MouseDrawLine() {
		addMouseListener(new MouseAdapter() {
			//鼠标下压事件
			@Override
			public void mousePressed(MouseEvent e) {
				x = e.getX();
				y = e.getY();
			}
			//鼠标弹起事件
			@Override
			public void mouseReleased(MouseEvent e) {
				System.out.println("鼠标弹起事件");
			}
		});
		
		addMouseMotionListener(new MouseMotionAdapter() {
			//鼠标下压移动事件
			@Override
			public void mouseDragged(MouseEvent e) {
				Graphics g = getGraphics();
				g.setColor(Color.BLACK);
				endX = e.getX();
				endY = e.getY();
				g.drawLine(x, y, endX, endY);
				x = endX;
				y = endY;
			}
		});

		setSize(600, 500);
		setLocation(200,100);
		setVisible(true);
		setDefaultCloseOperation(3);
	}

	public static void main(String[] args) {
		new MouseDrawLine();
	}
}