drawgradient.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 java.awt.image.*;
import javax.swing.*;
public class DrawGradient
    extends JFrame {
  public DrawGradient() {
    super("绘制二维图形");
    setSize(250, 160);
    setVisible(true);
  }

  public void paint(Graphics g) {
    super.paint(g);

    Graphics2D g2d = (Graphics2D) g;

    g2d.setPaint(Color.MAGENTA);
    g2d.setStroke(new BasicStroke(10.0f));
    g2d.setPaint(Color.green);
    g2d.draw(new Line2D.Double(70, 30, 15, 135));
    float dash[] = {
        10};
    g2d.setPaint(Color.pink);
    g2d.setStroke(new BasicStroke(6, BasicStroke.CAP_ROUND,
                                      BasicStroke.JOIN_ROUND,
                                      10, dash, 0));
    g2d.draw(new Rectangle2D.Double(15, 40, 55, 90));
    g2d.setPaint(new GradientPaint(80, 40, Color.GREEN, 145, 130, Color.RED));
    g2d.fill(new Ellipse2D.Double(80, 40, 60, 90));
    BufferedImage buffImage = new BufferedImage(10, 10,
                                                BufferedImage.SCALE_FAST);
    Graphics2D gd = buffImage.createGraphics();
    gd.setColor(Color.ORANGE);
    gd.fillOval(0, 0, 10, 10);
    g2d.setPaint(new TexturePaint(buffImage, new Rectangle(10, 10)));
    g2d.fill(new RoundRectangle2D.Double(155, 40, 70, 90, 50, 50));
  }

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