drawpolygons.java

本java源程序包括了大量的学习程序（共27章）方便大家学习

import java.awt.*;
import javax.swing.*;

public class DrawPolygons extends JFrame
{
	public DrawPolygons()
	{
		super("绘制 多边形");
		setSize(275, 230);
		setVisible(true);
	}
	
	public void paint(Graphics g)
	{
		super.paint(g);          //调用父类的方法paint()
		
		//绘制多边形,xValues[]数组指定每个绘制点的X坐标
		//yValues[]数组指定每个绘制点的Y坐标
		int xValues[] = {20, 40, 50, 30, 20, 15};
		int yValues[] = {50, 50, 60, 80, 80, 60};
		
		//创建一个多边形对象,该多边形的顶点个数为6
		Polygon polygon1 = new Polygon(xValues, yValues, 6);
		//绘制多边形
		g.drawPolygon(polygon1);
		
		//绘制一系列相连的线段,绘制点个数为7个
		int xValues2[] = {70, 90, 100, 80, 70, 65, 60};
		int yValues2[] = {100, 100, 110, 110, 130, 110, 90};
		g.drawPolyline(xValues2, yValues2, 7);
		
		//绘制实心多边形
		int xValues3[] = {120, 140, 150, 190};
		int yValues3[] = {40, 70, 80, 60};
		g.fillPolygon(xValues3, yValues3, 4);
		
		//创建一个多边形对象
		Polygon polygon2 = new Polygon();
		//将X,Y坐标添加到多边形对象中
		polygon2.addPoint(165, 135);
		polygon2.addPoint(175, 150);
		polygon2.addPoint(270, 200);
		polygon2.addPoint(200, 220);
		polygon2.addPoint(130, 180);		
    //使用Polygon对象绘制一个实心多边形
		g.fillPolygon(polygon2);
	}  	
	public static void main(String[] args) 
	{
		DrawPolygons application = new DrawPolygons();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}