两个Java窗口小程序

连线拖动，拖动线的头和尾到任意位置，刚打开的时候：

一条线刚出现的时候：

两条线随意拖动的时候：

一个三角形组件，测试鼠标是否点击了它：

三角形组件的代码比较少，就列到下面吧

 

//

// 三角形的组件

//

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

 

public class TriangleTest extends javax.swing.JFrame

{

  public static void main(String[] args)

  {

    TriangleTest tt = new TriangleTest();

    tt.setSize(400, 300);

    tt.setVisible(true);

  }

  public TriangleTest()

  {

    super("Triangle Test");

    getContentPane().setLayout(new java.awt.FlowLayout());

    Triangle t = new Triangle();

    getContentPane().add(t);

 

    //给组件添加事件

    t.addMouseListener(new MouseAdapter()

    {

      public void mousePressed(MouseEvent event)

      {

        System.out.println("You cicked on the triangle");

      }

    });

  }

}

 

class Triangle extends JComponent

{

  protected Polygon activeRegion;

 

  public Triangle()

  {

    setPreferredSize(new Dimension(100, 100));

  }

 

  public boolean contains(int x, int y)

  {

    return activeRegion.contains(x, y);

  }

 

  public void setBounds(int x, int y, int width, int height)

  {

    super.setBounds(x, y, width, height);

    int[] xpoints = new int[3];

    int[] ypoints = new int[3];

 

    xpoints[0] = (width -1) / 2;

    ypoints[0] = 0;

 

    xpoints[1] = 0;

    ypoints[1] = height - 1;

 

    xpoints[2] = width -1;

    ypoints[2] = height -1;

    activeRegion = new Polygon(xpoints, ypoints, 3);

  }

 

  public void paintComponent(Graphics g)

  {

    g.setColor(getForeground());

    g.fillPolygon(activeRegion);

  }

}

 

 

作者：杨志鹏

2010年1月整理