Ankit Virparia » Method communication

Rotating Colorful Squares

Ankit Virparia — Sun, 06 Jan 2013 05:15:42 +0000

Definition:

Write an applet that draws four squares of equal size & of different colors such that they cover up the whole applet area. The applet should operate correctly even if it is resized.

import java.applet.*;
import java.awt.*;

public class rotateSquares extends Applet implements Runnable
{
	Color[] clr = {Color.red, Color.green, Color.pink, Color.blue};
	int cnt = 0;
	Thread t;
	public void init()
	{
		t = new Thread(this);
		t.start();
		setBackground(Color.black);	
	}
	
	public void run()
	{
		try
		{
			while(true)
			{
				
				repaint();
				t.sleep(1000);
				cnt++;	
				if(cnt>3){cnt=0;}
			}
		}
		catch(Exception e)
		{
			System.out.println(e);	
		}
	}
		
	public void paint(Graphics g)
	{
		int w = getWidth();
		int h = getHeight();
		
		int tmp = cnt;
		for(int i=0;i<4;i++)
		{
		 g.setColor(clr[tmp++]);
		 if(tmp>3)tmp=0;
		 
		 if(i==0) g.fillRect(0,0,w/2,h/2);
		 else if(i==1) g.fillRect(w/2,0,w/2,h/2);
		 else if(i==2) g.fillRect(w/2,h/2,w/2,h/2);
		 else if(i==3) g.fillRect(0,h/2,w/2,h/2); 
		}
	}	
	
}

/*

*/

Output:

The post Rotating Colorful Squares appeared first on Ankit Virparia.

Rotating Colorful Disk

Ankit Virparia — Sun, 06 Jan 2013 04:57:24 +0000

Once again, One more tutorial on Method communication. But here we need communication between Applet Life cycle methods and Thread-> run() method. To draw a disc, We have used 4 Arcs of 90 degrees each. For display color rotation, We have used Color[]. Rest everything is self explanatory. You may leave a comment in case you face any difficulty.

File Name: rotateArc.java

import java.applet.*;
import java.awt.*;

public class rotateArc extends Applet implements Runnable
{
	Color[] clr = {Color.red, Color.green, Color.pink, Color.blue};
	int cnt = 0;
	Thread t;
	public void init()
	{
		t = new Thread(this);
		t.start();
		setBackground(Color.black);	
	}
	
	public void run()
	{
		try
		{
			while(true)
			{
				
				repaint();
				t.sleep(1000);
				cnt++;	
				if(cnt>3){cnt=0;}
			}
		}
		catch(Exception e)
		{
			System.out.println(e);	
		}
	}
		
	public void paint(Graphics g)
	{
		int tmp = cnt;
		for(int i=0;i<4;i++)
		{
		 g.setColor(clr[tmp++]);
		 if(tmp>3)tmp=0;
		 g.fillArc(0,0,500,500,90*i,90);
		}
	}	
	
}

/*

*/

The post Rotating Colorful Disk appeared first on Ankit Virparia.

Cartoon Character – Moving Hands

Ankit Virparia — Sun, 06 Jan 2013 04:29:28 +0000

Our aim of this tutorial is to learn the communication between applet life cycle methods. What I mean by communication is: One of the method may generate some values which is used by other method/methods. Here we want a scenario that when user changes the Browser tab or minimize-maximize the appletviewer, Position of the hands(of cartoon character!) should be toggled. And this will create an view like a cartoon character is doing exercise.

import java.applet.*;
import java.awt.*;

public class toonApplet extends Applet
{
	int y = 200;
	public void init()
	{	
		setBackground(Color.YELLOW);
	}
	
	public void stop()	
	{
		if(y==200)y = 50;
		else y = 200;
	}
	
	public void paint(Graphics g)
	{
		g.drawOval(200,50,100,100);
		g.drawRect(50,150,400,50);

		g.drawRect(50,y,50,100);
		g.drawRect(400,y,50,100);

		g.drawRect(150,200,200,300);

		g.drawRect(150,500,50,100);
		g.drawRect(300,500,50,100);
	}
}
/*

*/

The post Cartoon Character – Moving Hands appeared first on Ankit Virparia.