java applet GUI 2D

package applet;
import java.awt.*;
import java.applet.*;
import java.awt.geom.*;

public class GUI2D extends Applet {
	
	public void paint(Graphics oldg) {
		Graphics2D g = (Graphics2D) oldg;
		// 设置笔画宽度
		BasicStroke stroke = new BasicStroke(10);
		g.setStroke(stroke);
		// 画线
		Line2D line = new Line2D.Float(0, 0, 20, 30);
		g.draw(line);
		line = new Line2D.Float(50, 50, 100, 50);
		g.draw(line);
		line = new Line2D.Float(50, 50, 50, 100);
		g.draw(line);
		stroke = new BasicStroke(5);
		g.setStroke(stroke);
		// 设置渐变填充
		GradientPaint gt = new GradientPaint(0, 0, Color.green, 50, 30,
				Color.blue, true);
		g.setPaint((Paint) gt);
		// 画矩形
		Rectangle2D rect = new Rectangle2D.Float(80, 80, 40, 40);
		g.draw(rect);
		rect = new Rectangle2D.Float(100, 100, 40, 40);
		g.fill(rect);
		// 画椭圆
		Ellipse2D ellipse = new Ellipse2D.Float(120, 120, 30, 40);
		g.draw(ellipse);
		gt = new GradientPaint(0, 0, Color.red, 30, 30, Color.yellow, true);
		g.setPaint((Paint) gt);
		ellipse = new Ellipse2D.Float(140, 140, 20, 20);
		g.fill(ellipse);
		// 画圆角矩形
		RoundRectangle2D roundRect = new RoundRectangle2D.Float(160, 160, 40,
				40, 20, 20);
		g.draw(roundRect);
		roundRect = new RoundRectangle2D.Float(180, 180, 40, 40, 20, 20);
		g.fill(roundRect);
		// 画几何图形
		GeneralPath path = new GeneralPath();
		path.moveTo(150, 0);
		path.lineTo(160, 50);
		path.curveTo(190, 200, 240, 140, 200, 100);
		g.fill(path);
	}
}