import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;


/*Applet 4 is the same as Applet 2,
  except that it accepts imput from the mouse.
  One programs this, in general, by importing the 
  MouseListener.  When you import the
  MouseListener, you must specify what
  happens for all 5 mouse events, even
  if nothing happens.  See below. */



public class test1 extends Applet implements MouseListener {

   Color col;                      //color of triangle

   public void init() { 
      addMouseListener(this);
      setBackground(Color.black);
      col=Color.red;               //initialize color
    }


  public void paint(Graphics g) {   
      g.setFont(new Font("Helvetica",Font.PLAIN,40));
      g.setColor(Color.yellow);
      g.drawString("Rich: Applet 4",10,40);
      g.setFont(new Font("Helvetica",Font.PLAIN,20));
      g.drawString("Click on the triangle",10,255);
      g.drawString("to change its color.",10,280);
     
          /**draw triangle**/
      g.setColor(col);
      int x[]={100,100,200};
      int y[]={100,200,200};
      g.fillPolygon(x,y,3);
  }



         /**mouse event methods**/
  public void mousePressed(MouseEvent e) {}    
  public void mouseReleased(MouseEvent e) {} 
  public void mouseEntered(MouseEvent e) {}   
  public void mouseExited(MouseEvent e) {}
  public void mouseClicked(MouseEvent e) {
      e.consume();                             //register event
      if((e.getX()>100)&&(e.getY()<200)&&(e.getX()<e.getY())) {
	Color temp=Color.red;
	if(col==Color.blue) temp=Color.red;
        if(col==Color.red) temp=Color.blue;
	col=temp;
	repaint(100,100,100,100);              //re-does paint method
      }
  }
}