flower.java

Java程序设计实用教程源代码 本书源代码按章分别放置在不同的文件夹中,所有程序均在JDK1.6环境下编译运行正常,除了第13章需要建立ODBC数据源之外,其他程序只要有Java运行环境即可直接运行

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class flower extends JFrame {
  public flower() {
    super("绘制二维图形");
    setSize(320, 320);
    setVisible(true);
  }

  public void paint(Graphics g) {
    super.paint(g);
    int xPoints[] = {
        40, 100, 75};
    int yPoints[] = {
        40, 100, 95};
    Graphics2D g2d = (Graphics2D) g;
    GeneralPath flowers = new GeneralPath();
    flowers.moveTo(xPoints[0], yPoints[0]);
    for (int i = 1; i < xPoints.length; i++)
      flowers.lineTo(xPoints[i], yPoints[i]);
    flowers.closePath();
    g2d.translate(150, 170);
    for (int i = 1; i <= 20; i++) {
      g2d.rotate(Math.PI / 10.0);
      g2d.setColor(new Color( (int) (Math.random() * 256),
                             (int) (Math.random() * 256),
                             (int) (Math.random() * 256)));
      g2d.fill(flowers);
    }
  }

  public static void main(String args[]) {
    flower app = new flower();
    app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
}