//  MovingBallView.java by Kari Laitinen 

//  http://www.naturalprogramming.com/

//  2012-02-10  Own file for the MovingBallView class
//  2015-03-14  Last modification.


package moving.ball ;

import android.graphics.* ;
import android.view.* ;
import android.content.Context ;
import android.util.AttributeSet ;

public class MovingBallView extends View
{
   int ball_center_point_x = 100 ;
   int ball_center_point_y = 100 ;

   int ball_color  =  Color.RED ;

   public MovingBallView( Context context ) 
   {
      super( context ) ;
   }
    
   //  The following constructor is needed when MovingBallView object is
   //  specified in an XML file, and is thus created automatically.

   public MovingBallView( Context context, AttributeSet attributes ) 
   {
      super( context, attributes ) ;

      setBackgroundColor( 0xFFFFFFE0 ) ; // Light Yellow
   }

   public void onSizeChanged( int current_width_of_this_view,
                              int current_height_of_this_view,
                              int old_width_of_this_view,
                              int old_height_of_this_view )
   {
      ball_center_point_x  = current_width_of_this_view / 2 ;
      ball_center_point_y  = current_height_of_this_view  / 2 ;
   }

   public void move_ball_left() 
   {
      ball_center_point_x -= 3 ;
      invalidate() ;
   }

   public void move_ball_down() 
   {
      ball_center_point_y += 3 ;
      invalidate() ;
   }

   public void move_ball_up() 
   {
      ball_center_point_y -= 3 ;
      invalidate() ;
   }

   public void move_ball_right() 
   {
      ball_center_point_x += 3 ;
      invalidate() ;
   }

   public void set_ball_color( int new_color )
   {
      ball_color = new_color ;
      invalidate() ;
   }
    
   @Override
   protected void onDraw( Canvas canvas ) 
   {
      Paint filling_paint = new Paint() ;
      filling_paint.setStyle( Paint.Style.FILL ) ;
      filling_paint.setColor( ball_color ) ;

      canvas.drawCircle( ball_center_point_x,
                         ball_center_point_y, 64, filling_paint ) ;

      Paint outline_paint = new Paint() ;
      outline_paint.setStyle( Paint.Style.STROKE ) ;
      // Default color for a Paint is black.

      canvas.drawCircle( ball_center_point_x,
                         ball_center_point_y, 64, outline_paint ) ;

      canvas.drawText( "("   +  ball_center_point_x  +
                       ", "  +  ball_center_point_y  + ")",
                       20, 20, outline_paint ) ;

   }
}