用java怎样画椭圆？

你的问题是是使用java画椭圆，可以使用awt和swing类库实现

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画椭圆可以通过画矩形及其内切椭圆实现，示例代码如下

如果只需要椭圆，则无需g2.draw(rect);

class DrawPanel extends JPanel {

public void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D) g;

// 画矩形

double leftX = 100;

double topY = 100;

double width = 200;

double height = 150;

Rectangle2D rect = new Rectangle2D.Double(leftX, topY, width, height);

g2.draw(rect);

// 画rect的内切椭圆

Ellipse2D ellipse = new Ellipse2D.Double();

ellipse.setFrame(rect);

g2.draw(ellipse);

}

}

Java如何编译椭圆周长的程序

publicclassCircle{圆的半径，privatedoublemRadius，publicCircle(doublemRadius){，this.mRadius=mRadius，}获取圆的周长，publicdoublegetLength，{return2Math.PImRadius，}，获取圆的面积publicdoublegetArea{returnMath.PImRadiusmRadius。这样即可在Java编译椭圆周长的程序。

java 椭圆算法

以下代码，将输出一个椭圆，再有问题，我可远程助你。如下：

/**

*(300,100)(400,100)

*

*/

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Lipse 

{

public static void main(String[] args)

{

new MainFrame();

}

}

class MainFrame extends JFrame implements ActionListener

{

JPanel pane=new JPanel();

JTextField T_a,T_b;

JButton Draw,Show;

JLabel L_a,L_b;

int a,b;

MainFrame()

{

super("DrawLipse Window");

Container con=this.getContentPane();

con.setLayout(null);

pane.setBounds(20,20,850,550);

pane.setBackground(new Color(100,156,200));

con.add(pane);

L_a=new JLabel("请输入长半径:a");

L_a.setBounds(180,580,100,20);

con.add(L_a);

L_b=new JLabel("请输入短半径:b");

L_b.setBounds(180,630,100,20);

con.add(L_b);

T_a=new JTextField();

T_a.setBounds(300,580,50,20);

con.add(T_a);

T_b=new JTextField();

T_b.setBounds(300,630,50,20);

con.add(T_b);

Draw=new JButton("画椭圆");

Draw.setBounds(550,580,90,30);

Draw.addActionListener(this);

con.add(Draw);

Show=new JButton("显示坐标");

Show.setBounds(550,620,90,30);

Show.addActionListener(this);

con.add(Show);

this.addWindowListener(new CloseWindow());

this.setBounds(20,20,900,700);

this.setVisible(true);

this.setResizable(false);

}/*MainFrame()*/

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==Draw)

{

a=Integer.parseInt(T_a.getText().trim());

b=Integer.parseInt(T_b.getText().trim());

Line line=new Line(this);

line.drawLipse(a,b); 

}

if(e.getSource()==Show)

{

Graphics g1=this.pane.getGraphics();

g1.setColor(Color.PINK);

g1.drawLine(0,300,920,300);//----x---

g1.drawLine(410,0,410,720);//----y---

g1.dispose();

}

}/*method actionPerformed*/

}

class Line

{

MainFrame jb;

Line(MainFrame jb)

{

this.jb=jb;

}

public void drawLipse(int a,int b)

{

int x,y;

double d1,d2;

x=0;  y=b;

d1=b*b+a*a*(-b+0.25);

Graphics g=jb.pane.getGraphics();

g.setColor(Color.red);

g.drawLine(x+410,y+300,x+410,y+300);

g.drawLine(-x+410,-y+300,-x+410,-y+300);

g.drawLine(-x+410,y+300,x+410,-y+300);

g.drawLine(x+410,-y+300,x+410,-y+300);

try

{

while(b*b*(x+1)a*a*(y-0.5))

{

if(d1=0)

{

d1+=b*b*(2*x+3);

x++;

}

else

{

d1+=(b*b*(2*x+3)+a*a*(-2*y+2));

x++;

y--;

}

g.drawLine(x+410,y+300,x+410,y+300);

g.drawLine(-x+410,-y+300,-x+410,-y+300);

g.drawLine(-x+410,y+300,x+410,-y+300);

g.drawLine(x+410,-y+300,x+410,-y+300);

Thread.sleep(30);

}// top of while 

}catch(Exception e){}

d2=b*b*(x+0.5)*(x+0.5)+a*a*(y-1)*(y-1)-a*a*b*b;

try

{

while(y0)

{

if(d2=0)

{

d2+=b*b*(2*x+2)+a*a*(-2*y+3);

x++;

y--;

}

else

{

d2+=a*a*(-2*y+3);

y--;

}

g.drawLine(x+410,y+300,x+410,y+300);

g.drawLine(-x+410,-y+300,-x+410,-y+300);

g.drawLine(-x+410,y+300,x+410,-y+300);

g.drawLine(x+410,-y+300,x+410,-y+300);

Thread.sleep(30);

}/* bottom of while*/

}catch(Exception e){}

} /*DrawLipse*/ 

}

class CloseWindow extends WindowAdapter

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

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