drawpolygonapplet.java

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// Fig. 2.10_01: DrawPolygonApplet.java
// 绘制空心多边形

import java.awt.*; // 引入 java.awt包中所有的类
import javax.swing.*; // 引入 javax.swing包中所有的类

public class DrawPolygonApplet extends JApplet
{
    // 在applet上绘制空心多边形
    public void paint(Graphics g)
    {
        // 调用父类的 paint 方法
        super.paint(g);

        // 设置字体
        g.setFont(new Font("汉真广标", Font.PLAIN, 35));
        g.drawString("空心多边形的画法", 10, 35);

        g.setColor(Color.BLUE);

        // 绘制一个五角星		
        int[] xValues = { 55, 67, 109, 73, 83, 55, 27, 37, 1, 43 };
        int[] yValues = { 70, 106, 106, 124, 166, 142, 166, 124, 106, 106 };
        Polygon fiveStar = new Polygon(xValues, yValues, xValues.length);
        g.drawPolygon(fiveStar);

        // 空心多边形的画法2，创建一个新的不包含任何顶点的Ploygon实例
        Polygon sharp = new Polygon();
        sharp.addPoint(185, 45);
        sharp.addPoint(195, 110);
        sharp.addPoint(290, 160);
        sharp.addPoint(220, 180);
        sharp.addPoint(150, 140);

        g.setColor(Color.RED);
        g.drawPolygon(sharp);

    } // paint 方法结束

} //  DrawPolygonApplet 类结束

/**************************************************************************
 * (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓).  *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors of this code have used their                   *
 * best efforts in preparing the code. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these codes. The authors *
 * shall not be liable in any event for incidental or consequential       *
 * damages in connection with, or arising out of, the furnishing,         *
 * performance, or use of these programs.                                 *
    **************************************************************************/