// Scribble0d Applet ... Etch and Sketch Applet ( erase button added )
package	Scribble2;
import		java.applet.*;
import		java.awt.*;
import		java.util.*;

public class Scribble0d extends Applet
	{
		private Button clear_button, erase_button;
		private Choice color_choices;
		private int last_x, last_y;
		private Color current_color;
		private Vector lines = new Vector(100, 100);

		public void init( )
			{
				this.setBackground( Color.white );

				clear_button = new Button( "Clear" );
				clear_button.setBackground( Color.lightGray );
				clear_button.setForeground( Color.black );
				this.add( clear_button );

				this.add( new Label( "Color:" ) );

				color_choices = new Choice( );
				color_choices.addItem( "black" );
				color_choices.addItem( "red" );
				color_choices.addItem( "yellow" );
				color_choices.addItem( "green" );
				color_choices.addItem( "blue" );
				color_choices.addItem( "white" );
				color_choices.setForeground( Color.black );
				color_choices.setBackground( Color.lightGray );
				this.add( color_choices );
				
				erase_button = new Button( "Erase" );
				erase_button.setBackground( Color.lightGray );
				erase_button.setForeground( Color.black );
				this.add( erase_button );

			}

		public boolean mouseDown( Event e, int x, int y )
			{
				last_x = x;
				last_y = y;
				return true;
			}




		public boolean mouseDrag( Event e, int x, int y )
			{
				Graphics g = this.getGraphics( );
				g.setColor( current_color );
				g.drawLine( last_x, last_y,  x, y );
				lines.addElement( new LineC( last_x, last_y, 
								     x, y, current_color ) );
				last_x = x;
				last_y = y;
				return true;
			}


		public void update (Graphics g) { paint( g ); }

		public void paint (Graphics g) 
			{
				LineC l;
				//Graphics g  = canvas.getGraphics();
				for( int i = 0; i < lines.size(); i++ )
					{
						l = (LineC)lines.elementAt( i );
						g.setColor( l.clr );
						g.drawLine( l.x1, l.y1,  l.x2, l.y2 );
					}	
			}


		public boolean action( Event event, Object arg )
			{
				if ( event.target == color_choices )
				    {
				      if (arg.equals( "black" ) ) current_color = Color.black;
				      if (arg.equals( "red" ) ) current_color = Color.red;	
				      if (arg.equals( "yellow" ) ) current_color = Color.yellow;
				      if (arg.equals( "green" ) ) current_color = Color.green;
				      if (arg.equals( "blue" ) ) current_color = Color.blue;
				      if (arg.equals( "white" ) ) current_color = Color.white;
				      return true;
				    }
				else if ( event.target == clear_button )
				   {
				      Graphics g = this.getGraphics();
				      Rectangle r = this.bounds( );
				      g.setColor( this.getBackground( ) );
				      g.fillRect( r.x, r.y,  r.width, r.height );
				      lines.removeAllElements( );
				      repaint( );
				      return true;
				   }
				else if ( event.target == erase_button )
				   {				   	  
				   	  if ( !lines.isEmpty() ) {
				   	  	  Graphics g = this.getGraphics();
				   	  	  g.setColor( this.getBackground( ) );
				   	  	  LineC l = (LineC)lines.lastElement();
				   	  	  g.drawLine( l.x1, l.y1,  l.x2, l.y2 );
				   	  	  lines.removeElement( l );
				   	  	  repaint(); }
				   	  return true;
				   }
				else return super.action( event, arg );
			}
	}