java graphics2d 矩形_使用java.awt.Graphics2D画矩形详解

java画矩形需要使用Rectangle2D.Float静态方法，指定四个参数即可，四个参数分别为左上角的xy坐标，以及矩形的宽度和高度

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.geom.Rectangle2D;

/**

* Displays a JFrame and draws a ractangle on it using the Java 2D Graphics API

*

* @author cn.outofmemory

*/

public class Java2DFrame extends javax.swing.JFrame {

/**

* Creates a new instance of Java2DFrame

*/

public Java2DFrame() {

initComponents();

}

/**

* This is the method where the rectangle is drawn.

*

* @param g The graphics object

*/

public void paint(Graphics g) {

Graphics2D graphics2 = (Graphics2D) g;

Rectangle2D rectangle = new Rectangle2D.Float(100, 100, 240, 160);

graphics2.draw(rectangle);

}

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