【Java swing】实现鼠标拖动图形

Question

已经在窗口中绘制了一个图形，如何用鼠标拖动它？

目前只能实现拖动窗口......

Answer 1

import java.awt.*;
import java.awt.event.*;
 
import javax.swing.*;
import javax.swing.event.*;
 
public class PhotoMoving {
 
	JLabel Pic; //图片，用于拖动
	   JFrame frame;
	   JPanel panel;
	   
	   public PhotoMoving() 
	   {
		   frame=new JFrame("图片的拖动");
		   Pic = new JLabel(new ImageIcon("images\\1.PNG"));
	      panel=new JPanel();
	      panel.setBackground(Color.white);
	      panel.add(Pic);
	      
	      //事件
	      MyMouseInputAdapter listener=new MyMouseInputAdapter();  //鼠标事件处理
	      Pic.addMouseListener(listener);  //增加标签的鼠标事件处理
	      Pic.addMouseMotionListener(listener);       
	      
	      frame.add(panel);
	      frame.setSize(400,300);
	      frame.setVisible(true); 
	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	   }
	   
	   class MyMouseInputAdapter extends MouseInputAdapter{
		   Point point=new Point(0,0); //坐标点
		      
		   public void mousePressed(MouseEvent e)
		   {
		       point=SwingUtilities.convertPoint(Pic,e.getPoint(),Pic.getParent()); //得到当前坐标点
		   }
		      
		   public void mouseDragged(MouseEvent e)
		   {
		      Point newPoint=SwingUtilities.convertPoint(Pic,e.getPoint(),Pic.getParent()); //转换坐标系统
		      Pic.setLocation(Pic.getX()+(newPoint.x-point.x),Pic.getY()+(newPoint.y-point.y)); //设置标签图片的新位置
		      point=newPoint; //更改坐标点
		   }
	   }
	   
	   public static void main(String[] args){
		   new PhotoMoving();
	   }
}