//Draw2D.java
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

public class Draw2D extends JFrame{

	public Draw2D(){
		super("Java2D圖形繪制");
		setSize(200,150);
		setVisible(true);
	}
	public void paint(Graphics g){
		super.paint(g);
		Graphics2D g2D=(Graphics2D)g;//將圖形對象強制轉(zhuǎn)換為Graphics2D類型
		//用紅色，5.0寬的畫筆繪制2D線段
		g2D.setPaint(Color.RED);
		g2D.setStroke(new BasicStroke(5.0f));
		g2D.draw(new Line2D.Float(30.5f,30.5f,30.5f,130.5f));
		
		//用藍-黃漸變色繪制2D圖形橢圓
		g2D.setPaint(new GradientPaint(5,30,Color.BLUE,35,100,Color.YELLOW,true));
		//Graphics2D類的方法，設(shè)置漸變色
		g2D.fill(new Ellipse2D.Double(45,30,65,100));
		//用綠色，10.0寬的畫筆繪制2D矩形
		g2D.setPaint(Color.GREEN);
		g2D.setStroke(new BasicStroke(10.0f));
		g2D.draw(new Rectangle2D.Double(120,30,50,100));
	}
	
	public static void main(String args[])
	{
		Draw2D myDraw2D=new Draw2D();
		myDraw2D.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}