exam11_6.java

java学习课件

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class Exam11_6 extends JFrame
{
   public Exam11_6()
   {
     super("演示画笔应用示例");
     setSize(200,100);
     setVisible(true);
     setDefaultCloseOperation(EXIT_ON_CLOSE);
   }
   public void paint(Graphics g)  //重写绘图方法paint()
   {
     Graphics2D g2d = (Graphics2D)g; // 强制转换为Graphics2D引用
     int xp[]={50,10,90,50}; //定义x坐标点
     int yp[]={30,70,70,30}; //定义y坐标点
     GeneralPath path1=new GeneralPath(); // 构建GeneralPath类对象path1
     path1.moveTo(xp[0],yp[0]);   // 将起始点加入路径
     for(int i=1; i<xp.length;i++) path1.lineTo(xp[i],yp[i]);//坐标点加入路径
     GeneralPath path2=new GeneralPath(); // 构建GeneralPath类对象path2
     path2.moveTo(xp[0]+100,yp[0]);   // 将起始点加入路径
     for(int i=1; i<xp.length;i++) path2.lineTo(xp[i]+100,yp[i]);//坐标点加入路径
     BasicStroke  wideLine=new BasicStroke(4,1,2);//线宽为4,末端圆形,两线交汇不修饰
     g2d.setStroke(wideLine);//设置画笔
     g2d.draw(path1);  //绘制第1个三角形
     float dash[]={8,4,2}; //定义虚线样式
	    BasicStroke dashLine=new BasicStroke(1,1,0,10,dash,0);//定义画笔
	    g2d.setStroke(dashLine); //设置画笔
	    g2d.draw(path2);  //绘制第2个三角形
   } //绘图方法结束
   public static void main(String args[])  //主方法main()
   {
     new Exam11_6();
   }    //主方法main()结束
}