画图工具：可以用鼠标在屏幕上画线，并且可以改变线条

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原创最新推荐文章于 2026-08-24 09:36:18 发布 7.9k 阅读 AI 写同款· GEO 优化 ›

vtk 鼠标移动画线（鼠标轨迹生成）鼠标左键按下开始画线，抬起则完成画线，此功能的重点在于在鼠标移动时更新线的状态。使用的是vtkPloyLine实现。2.按住左键，鼠标移动，添加点，通过修改cells和points改变polydata。1.鼠标左键按下时，记录下按下的坐标，并且初始化线条对象等。3.鼠标左键抬起结束绘制（可以使用一个标志量来进行判断）阅读详情

import java.awt.*;
import java.awt.event.*;
public class MouseDraw extends Frame implements MouseMotionListener,MouseListener,ActionListener
{
   static MouseDraw frm=new MouseDraw();
   int x1,x2,y1,y2;
   private static Color[] colors = {
   Color.white, Color.black, Color.blue, Color.red,
   Color.yellow, Color.orange, Color.cyan, Color.pink,
   Color.green };
   static int i=1;
   Button btn1 = new Button("确定");
   Panel p1 = new Panel();
   Choice choice;

MouseDraw()
{
setSize(400,440);
setVisible(true);
choice = new Choice();
    choice.add("0.白色");
    choice.add("1.黑色");
    choice.add("2.蓝色");
    choice.add("3.红色");
    choice.add("4.黄色");
    choice.add("5.橙色");
    choice.add("6.灰色");
    choice.add("7.粉红色");
    choice.add("8.绿色");
btn1.addActionListener(this);
p1.add(choice);p1.add(btn1);
add(p1,BorderLayout.NORTH);
addWindowListener(new WindowAdapter()
{
public void windowClosing (WindowEvent e)
{System.exit(0);}
} );
validate();
}

   public static void main(String args[])
   {
      frm.setTitle("Free drawing");
      frm.setSize(500,350);
      frm.addMouseListener(frm);
      frm.addMouseMotionListener(frm);
      frm.setVisible(true);
   }
   public void actionPerformed(ActionEvent ae)
   {
     int index= choice.getSelectedIndex();
     this.i=index;
   }
   public void mousePressed(MouseEvent e)
   {
      x1=e.getX();
      y1=e.getY();
   }
   public void mouseDragged(MouseEvent e)
   {
      Graphics g=getGraphics();
      x2=e.getX();
      y2=e.getY();
      g.setColor(colors[this.i]);
      g.drawLine(x1,y1,x2,y2);
      x1=x2;
      y1=y2;
   }
   public void mouseMoved(MouseEvent e){}
   public void mouseReleased(MouseEvent e){}
   public void mouseEntered(MouseEvent e){}
   public void mouseExited(MouseEvent e){}
   public void mouseClicked(MouseEvent e){}
}