Draw a ellipse and a rectangle in Java Applet

Java applets are application that can be executed in web browsers or applet viewers . We can draw shapes on the Java applet.
In this article we will draw a ellipse on Java applet by two ways . By using the drawOval(int x, int y, int width, int height) or by using mathematical formula (X= A * sin a, Y= B *cos a, where A and B are major and minor axes and a is the angle ) .
Similarly, we will draw a rectangle on Java applet by two ways . By using the drawRect(int x, int y, int width, int height) or by drawing four lines joining the edges .

To draw a ellipse in Java Applet
Examples:
Let us draw a oval with width 150 and height 100

Input : x and y coordinates 100, 100 respectively
Width and height 150 and 100 respectively

Output :

To draw a rectangle in Java Applet
Examples:
We will draw a rectangle of height 200 and width 200 and
At a position 100,100 on the applet.

Input : x and y coordinates 100, 100 respectively
Width and height 200 and 200 respectively.

Output :

1. Java Program to draw a ellipse using drawOval(int x, int y, int width, int height)

// java program to draw a ellipse 
// using drawOval function. 
import java.awt.*; 
import javax.swing.*; 
  
public class ellipse extends JApplet { 
  
    public void init() 
    { 
        // set size 
        setSize(400, 400); 
  
        repaint(); 
    } 
  
    // paint the applet 
    public void paint(Graphics g) 
    { 
        // set Color for rectangle 
        g.setColor(Color.red); 
  
        // draw a ellipse 
        g.drawOval(100, 100, 150, 100); 
    } 
} 

Output :

2. program to draw a ellipse using drawLine function

// java program to draw a ellipse 
// using drawLine function 
import java.awt.*; 
import javax.swing.*; 
  
public class ellipse extends JApplet { 
  
    public void init() 
    { 
        setSize(300, 300); 
    } 
  
    public void paint(Graphics g) 
    { 
        // center of the 
        int cx, cy; 
  
        // center of th ellipse 
        cx = 150; 
        cy = 175; 
  
        // major and minor axis 
        double A = 75, B = 50, px = 0, py = 0; 
  
        // set color 
        g.setColor(Color.red); 
  
        // draw the ellipse 
        for (int i = 0; i <= 360; i++) { 
            double x, y; 
            x = A * Math.sin(Math.toRadians(i)); 
            y = B * Math.cos(Math.toRadians(i)); 
  
            if (i != 0) { 
                // draw a line joining previous and new point . 
                g.drawLine((int)px + cx, (int)py + cy, 
                                (int)x + cx, (int)y + cy); 
            } 
  
            // store the previous points 
            px = x; 
            py = y; 
        } 
    } 
} 

Output :

Now we will see how to draw a rectangle in a Java Applet

We can draw rectangle in java applet by two ways.
1. Draw a rectangle using drawRect(int x, int y, int width, int height)

// Java Program to  Draw a rectangle 
// using drawRect(int x, int y, int width, int height) 
import java.awt.*; 
import javax.swing.*; 
  
public class rectangle extends JApplet { 
  
    public void init() 
    { 
        // set size 
        setSize(400, 400); 
  
        repaint(); 
    } 
  
    // paint the applet 
    public void paint(Graphics g) 
    { 
        // set Color for rectangle 
        g.setColor(Color.red); 
  
        // draw a rectangle 
        g.drawRect(100, 100, 200, 200); 
    } 
} 

Output:

2. Draw a rectangle using drawLine(int x, int y, int x1, int y1)

// Java Program  Draw a rectangle 
// using drawLine(int x, int y, int x1, int y1) 
import java.awt.*; 
import javax.swing.*; 
  
public class rectangle extends JApplet { 
  
    public void init() 
    { 
        // set size 
        setSize(400, 400); 
  
        repaint(); 
    } 
  
    // paint the applet 
    public void paint(Graphics g) 
    { 
        // set Color for rectangle 
        g.setColor(Color.red); 
  
        // draw a rectangle by drawing four lines 
        g.drawLine(100, 100, 100, 300); 
        g.drawLine(100, 300, 300, 300); 
        g.drawLine(300, 300, 300, 100); 
        g.drawLine(300, 100, 100, 100); 
    } 
} 

Output :

Note : the following programs might not run in an online compiler please use an offline IDE.

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