Solved

Circle and Ellipse

Posted on 2010-11-18
9
389 Views
Last Modified: 2012-05-10
How do I make an ellipse??? I have mange to do the circle code.
Anyone could show me?

Ellips
Area = p * a * b
import java.awt.geom.*;

/**
 * A circle that can be manipulated and that draws itself on a canvas.
 * 
 *
 */

public class Circle extends Shape
{
    private int diameter;
    
    /**
     * Create a new circle at default position with default color.
     */
    public Circle()
    {
        super(20, 60, "blue", false);
        diameter = 30;
    }
    

    /**
     * Change the size to the new size (in pixels). Size must be >= 0.
     */
    public void changeSize(int newDiameter)
    {
        erase();
        diameter = newDiameter;
        draw();
    }

    /**
     * Draw the circle with current specifications on screen.
     */
    protected void draw()
    {
        if(isVisible) {
            Canvas canvas = Canvas.getCanvas();
            canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition, 
                                                          diameter, diameter));
            canvas.wait(10);
        }
    }

     /**
     * Get the area value of the circle.
     */
    public double getArea()
    {
        return Math.PI * diameter * diameter;
    }
        
}

Open in new window

0
Comment
Question by:Mickeys
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
9 Comments
 
LVL 33

Expert Comment

by:jppinto
ID: 34162708

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;

import javax.swing.JApplet;
import javax.swing.JFrame;

public class EllipseDemo2D extends JApplet {
  final static BasicStroke stroke = new BasicStroke(2.0f);  
  public void init() {
    setBackground(Color.white);
    setForeground(Color.white);
  }


  public void paint(Graphics g) {
    Graphics2D g2 = (Graphics2D) g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

    g2.setPaint(Color.gray);
    int x = 5;
    int y = 7;

    g2.setStroke(stroke);
    g2.draw(new Ellipse2D.Double(x, y, 200, 200));
    g2.drawString("Ellipse2D", x, 250);

  }

  public static void main(String s[]) {
    JFrame f = new JFrame("");
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    JApplet applet = new EllipseDemo2D();
    f.getContentPane().add("Center", applet);
    applet.init();
    f.pack();
    f.setSize(new Dimension(300, 300));
    f.show();
  }
}

Open in new window

0
 

Author Comment

by:Mickeys
ID: 34162728
Ehhh??? I need to use it from my code. I could have found copy paste on internet myself.
0
 
LVL 16

Expert Comment

by:Valeri
ID: 34162841
in this line
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
                                                          diameter, diameter));

change to
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
                                                          diameter, diameter + 70));
0
Revamp Your Training Process

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action.

 
LVL 16

Expert Comment

by:Valeri
ID: 34162854
If your parameters 3 and 4 are equal, it's a circle, otherwise if they are different it's a ellipse...
0
 

Author Comment

by:Mickeys
ID: 34162857
so I should like extend from circle or someting?
0
 
LVL 16

Expert Comment

by:Valeri
ID: 34162891
Actually circle is ellipse, a particular kind of ellipse, so you have to have 2 parameters :
diameterX and diameter Y
A proportion between them determine how will your ellipse will look like. If they are equal it's a circle.
so change the line to :
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
                                                          diameterX , diameterY));
0
 

Author Comment

by:Mickeys
ID: 34163282
so what you are saying. Use that line and exchange diameter to x and y.

So a copy of the circle?????? with the above included.
0
 
LVL 16

Accepted Solution

by:
Valeri earned 500 total points
ID: 34163370
no, just create another class, for Ellipse, it similar to Circle, but it's good to have different classes for Circle and Ellipse. Here it is :

import java.awt.geom.*;

public class Ellipse extends Shape {
    private int diameterX, diameterY;
   
    /**
     * Create a new circle at default position with default color.
     */
    public Ellipse()
    {
        super(20, 60, "blue", false);
        diameterX = 30; diameterY = 30;
    }
   

    /**
     * Change the size to the new size (in pixels). Size must be >= 0.
     */
    public void changeSize(int diameterX, int diameterY)
    {
        erase();
        this.diameterX = diameterX; this.diameterY = diameterY;
        draw();
    }

    /**
     * Draw the circle with current specifications on screen.
     */
    protected void draw()
    {
        if(isVisible) {
            Canvas canvas = Canvas.getCanvas();
            canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition, diameterX, diameterY));
            canvas.wait(10);
        }
    }

     /**
     * Get the area value of the circle.
     */
    public double getArea()
    {
        return Math.PI * diameterX * diameterY;
    }
       
}
0
 

Author Closing Comment

by:Mickeys
ID: 34163462
Ok. I just thought it should inheritate like Ellipse extend Circle but i guess I was wrong. :-)
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Problem to Alipay 10 73
hashmap order 17 43
Need Help! Getting a syntax error and don't understand why 3 41
Java array sort 10 36
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
This video teaches viewers about errors in exception handling.

697 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question