Exercise-13
a) Paint like Paint Brush in Applet
AIM: To write a JAVA program to paint like paint brush in applet.
SOURCE-CODE:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
//<applet code="paintdemo" width="800" height="500"></applet>
public class paintdemo extends Applet implements MouseMotionListener
{
int w, h;
Image i;
Graphics g1;
public void init()
{
w = getSize().width; h = getSize().height;
i = createImage( w, h );
g1 = i.getGraphics();
g1.setColor( Color.white ); g1.fillRect( 0, 0, w, h ); g1.setColor( Color.red );
i = createImage( w, h );
g1 = i.getGraphics();
g1.setColor( Color.white ); g1.fillRect( 0, 0, w, h ); g1.setColor( Color.blue );
addMouseMotionListener( this );
}
public void mouseMoved( MouseEvent e ) { }
public void mouseDragged( MouseEvent me )
{
int x = me.getX(); int y = me.getY();
g1.fillOval(x-10,y-10,20,20);
repaint();
me.consume();
}
public void update( Graphics g )
{
g.drawImage( i, 0, 0, this );
}
public void paint( Graphics g )
{
update(g);
}
}
OUT-PUT:
b) Display Analog Clock using Applet
AIM: To write a JAVA program to display analog clock using Applet.
SOURCE-CODE:
import java.util.*;
import java.text.*;
import java.applet.*;
import java.awt.*;
//<applet code="clockdemo" width="550" height="250"></applet
public class clockdemo extends Applet implements Runnable
{
int h=0, m=0, s=0;
String str=""; int wt, ht; Thread thr=null; boolean b;
public void init()
{
wt=getSize().width; ht=getSize().height;
}
public void start()
{
if (thr==null)
{
thr=new Thread(this);
b=false;
thr.start();
}
else
{
if(b)
{
b=false;
synchronized(this)
{
notify();
}
}
}
}
public void stop()
{
b=true;
}
public void run()
{
try
{
while(true)
{
Calendar clndr=Calendar.getInstance();
h=clndr.get(Calendar.HOUR_OF_DAY);
if(h>12)h-=12;
m=clndr.get(Calendar.MINUTE); s=clndr.get(Calendar.SECOND);
SimpleDateFormat frmatter=new SimpleDateFormat("hh:mm:ss",
Locale.getDefault());
Date d=clndr.getTime(); str=frmatter.format(d);
if(b)
{
synchronized (this)
{
while(b)
{
wait();
}
}
}
repaint();
thr.sleep(1000);
}
}
catch(Exception e)
{
System.out.println(e);
}
}
void drawHand(double angle, int radius, Graphics grp)
{
angle-=0.5*Math.PI;
int a=(int)(radius*Math.cos(angle)); int b=(int)(radius*Math.sin(angle));
grp.drawLine(wt/2,ht/2,wt/2+a,ht/2+b);
}
void drawWedge(double angle,int radius, Graphics grp)
{
angle-=0.5*Math.PI;
int a=(int)(radius*Math.cos(angle)); int b=(int)(radius*Math.sin(angle));
angle+=2*Math.PI/3;
int a2=(int)(5*Math.cos(angle)); int b2=(int)(5*Math.sin(angle));
angle+=2*Math.PI/3;
int a3=(int)(5*Math.cos(angle)); int b3=(int)(5*Math.sin(angle));
grp.drawLine(wt/2+a2, ht/2+b2,wt/2+a,ht/2+b);
grp.drawLine(wt/2+a3, ht/2+b3,wt/2+a,ht/2+b);
grp.drawLine(wt/2+a2, ht/2+b2,wt/2+a3,ht/2+b3);
}
public void paint(Graphics grp)
{
grp.setColor(Color.gray);
drawWedge(2*Math.PI*h/12,wt/5,grp); drawWedge(2*Math.PI*m/60,wt/3,grp);
drawHand(2*Math.PI*s/60,wt/2,grp);
}
}
OUT-PUT:
c) Display Analog Clock using Applet
AIM: To write a JAVA program to create different shapes and fill colors using Applet
SOURCE-CODE:
import java.awt.*;
import java.applet.*;
//<applet code="graphicsdemo" width="400" height="400"></applet>
public class graphicsdemo extends Applet
{
public void paint(Graphics g)
{
int x[]={10,220,220};
int y[]={400,400,520};
int n=3;
g.drawLine(10,30,200,30);
g.setColor(Color.blue); g.drawRect(10,40,200,30);
g.setColor(Color.red); g.fillRect(10,80,200,30);
g.setColor(Color.orange); g.drawRoundRect(10,120,200,30,20,20);
g.setColor(Color.green); g.fillRoundRect(10,160,200,30,20,20);
g.setColor(Color.blue); g.drawOval(10,200,200,30);
g.setColor(Color.black); g.fillOval(10,240,40,40);
g.setColor(Color.yellow); g.drawArc(10,290,200,30,0,180);
g.setColor(Color.yellow); g.fillArc(10,330,200,30,0,180);
g.setColor(Color.pink); g.fillPolygon(x,y,n);
}
}
OUT-PUT:
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