//  MovingBallView.java by Kari Laitinen 

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

//  2012-02-10  Own file for the MovingBallView class
//  2021-01-14  Kotlin version generated in Android Studio.


package moving.ball

import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.util.AttributeSet
import android.view.View

class MovingBallView : View
{
   var ball_center_point_x = 100
   var ball_center_point_y = 100
   var ball_color = Color.RED

   constructor(context: Context?) : super(context)
   {
   }

   //  The following constructor is needed when MovingBallView object is
   //  specified in an XML file, and is thus created automatically.
   
   constructor( context: Context?, attributes: AttributeSet? ) : super( context, attributes )
   {
      setBackgroundColor( 0xFFF5F5F5.toInt() ) // white smoke color
   }

   public override fun onSizeChanged( current_width_of_this_view: Int,
                                      current_height_of_this_view: Int,
                                      old_width_of_this_view: Int,
                                      old_height_of_this_view: Int)
   {
      ball_center_point_x = current_width_of_this_view / 2
      ball_center_point_y = current_height_of_this_view / 2
   }

   fun move_ball_left()
   {
      ball_center_point_x -= 3
      invalidate()
   }

   fun move_ball_down()
   {
      ball_center_point_y += 3
      invalidate()
   }

   fun move_ball_up()
   {
      ball_center_point_y -= 3
      invalidate()
   }

   fun move_ball_right()
   {
      ball_center_point_x += 3
      invalidate()
   }

   fun set_ball_color( new_color: Int )
   {
      ball_color = new_color
      invalidate()
   }

   override fun onDraw( canvas: Canvas )
   {
      val filling_paint = Paint()
      filling_paint.style = Paint.Style.FILL
      filling_paint.color = ball_color
      
      canvas.drawCircle(ball_center_point_x.toFloat(),
              ball_center_point_y.toFloat(), 64f, filling_paint)
              
      val outline_paint = Paint()
      outline_paint.style = Paint.Style.STROKE
      // Default color for a Paint is black.
      
      canvas.drawCircle( ball_center_point_x.toFloat(),
                         ball_center_point_y.toFloat(), 64f, outline_paint )
              
      canvas.drawText( "(" + ball_center_point_x +
                       ", " + ball_center_point_y + ")", 20f, 20f, outline_paint )
   }
}