java 渐变色窗体 MainClass.java

http://blog.csdn.net/zenwong/article/details/1857481











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import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JPanel {

public MainClass() {
}

public void paint(Graphics g) {
   Graphics2D g2D = (Graphics2D) g;

   Point2D.Float p1 = new Point2D.Float(150.f, 75.f);
   Point2D.Float p2 = new Point2D.Float(250.f, 75.f);
   float width = 300;
   float height = 50;
   GradientPaint g1 = new GradientPaint(p1, Color.WHITE, p2, Color.DARK_GRAY,
       true);
   Rectangle2D.Float rect1 = new Rectangle2D.Float(p1.x - 100, p1.y - 25,
       width, height);
   g2D.setPaint(g1);
   g2D.fill(rect1);
   g2D.setPaint(Color.BLACK);
   g2D.draw(rect1);
   g2D.draw(new Line2D.Float(p1, p2));
   g2D.drawString("Cyclic Gradient Paint", p1.x - 100, p1.y - 50);
   g2D.drawString("p1", p1.x - 20, p1.y);
   g2D.drawString("p2", p2.x + 10, p2.y);

   p1.setLocation(150, 200);
   p2.setLocation(250, 200);
   GradientPaint g2 = new GradientPaint(p1, Color.WHITE, p2, Color.DARK_GRAY,
       false);
   rect1.setRect(p1.x - 100, p1.y - 25, width, height);
   g2D.setPaint(g2);
   g2D.fill(rect1);
   g2D.setPaint(Color.BLACK);
   g2D.draw(rect1);
   g2D.draw(new Line2D.Float(p1, p2));
   g2D.drawString("Acyclic Gradient Paint", p1.x - 100, p1.y - 50);
   g2D.drawString("p1", p1.x - 20, p1.y);
   g2D.drawString("p2", p2.x + 10, p2.y);
}

public static void main(String[] args) {
   JFrame frame = new JFrame();
   frame.getContentPane().add(new MainClass());

   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(400, 300);
   frame.setVisible(true);
}
}