drawroundrect2d.java

本java源程序包括了大量的学习程序（共27章）方便大家学习

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

public class DrawRoundRect2D extends JFrame
{
	public DrawRoundRect2D()
	{
		super("绘制 2D 圆角矩形");   //调用父类JFrame的构造函数
		setSize(200, 150);         //设置窗口大小,宽度为200，高度为150
		setVisible(true);          //显示窗口
	}
	public void paint(Graphics g)
	{
		super.paint(g);              //调用父类方法paint()
		Graphics2D g2d = (Graphics2D)g;
		
		g2d.setPaint(Color.BLACK);
		//设置圆角矩形边框宽度
		g2d.setStroke(new BasicStroke(2.0f));
		//绘制圆角矩形,左上角坐标为(10,50),矩形宽为80,高为60，弧宽为20，弧高为20
		g2d.draw(new RoundRectangle2D.Double(10, 50, 80, 60, 20, 20));
		
		g2d.setPaint(Color.BLUE);
		//用蓝颜色填充圆角矩形
		g2d.fill(new RoundRectangle2D.Double(100, 50, 80, 60, 20, 20));
	}
	public static void main(String[] args) 
	{
		DrawRoundRect2D application = new DrawRoundRect2D();
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}