AWT Ellipse2D類

Ellipse2D的類聲明所定義的框架矩形橢圓。

類的聲明

以下是聲明java.awt.geom.Ellipse2D類：

public abstract class Ellipse2D extends RectangularShape

類的構造函數

S.N.

構造函數與說明

protected Ellipse2D()
This is an abstract class that cannot be instantiated directly.

類方法

S.N.

方法和說明

boolean contains(double x, double y)
Tests if the specified coordinates are inside the boundary of the Shape.

boolean contains(double x, double y, double w, double h)
Tests if the interior of the Shape entirely contains the specified rectangular area.

boolean equals(Object obj)
Determines whether or not the specified Object is equal to this Ellipse2D.

PathIterator getPathIterator(AffineTransform at)
Returns an iteration object that defines the boundary of this Ellipse2D.

int hashCode()
Returns the hashcode for this Ellipse2D.

boolean intersects(double x, double y, double w, double h)
Tests if the interior of the Shape intersects the interior of a specified rectangular area.

繼承的方法

這個類繼承的方法從以下類：

java.lang.Object

Ellipse2D 實例

選擇使用任何編輯器創建以下java程序 D:/ > AWT > com > yiibai > gui >

AWTGraphicsDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; import java.awt.geom.*; public class AWTGraphicsDemo extends Frame { public AWTGraphicsDemo(){ super("Java AWT Examples"); prepareGUI(); } public static void main(String[] args){ AWTGraphicsDemo awtGraphicsDemo = new AWTGraphicsDemo(); awtGraphicsDemo.setVisible(true); } private void prepareGUI(){ setSize(400,400); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); } @Override public void paint(Graphics g) { Ellipse2D shape = new Ellipse2D.Float(); shape.setFrame(100, 150, 200,100); Graphics2D g2 = (Graphics2D) g; g2.draw (shape); Font font = new Font("Serif", Font.PLAIN, 24); g2.setFont(font); g.drawString("Welcome to TutorialsPoint", 50, 70); g2.drawString("Ellipse2D.Oval", 100, 120); } }

編譯程序，使用命令提示符。進入到D:/> AWT，然後鍵入以下命令。

D:AWT>javac comyiibaiguiAWTGraphicsDemo.java

如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。

D:AWT>java com.yiibai.gui.AWTGraphicsDemo

驗證下面的輸出

AWT