//  FlyingArrowActivity.java  Copyright (c) Kari Laitinen

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

//  2012-01-23  File created.
//  2015-12-11  Last modification.


/* This program is an Android application that shows how
   the coordinate system can be re-positioned (i.e."translated"),
   rotated, and scaled.
   
   In addition, you can see how to draw shapes with the
   Path class.

   To run this program, set up an Android Studio project, so
   that FlyingArrowActivity is the name of the main activity class.
   You should also use the package name used below.
   After creating the project, you should replace the generated
   FlyingArrowActivity.java file with this file. No XML definitions
   are necessary.

   To see all the drawings made by this program, the screen
   size should be at least 320 x 480.

*/

// Documentation of the Canvas and Path classes can be found at
// http://developer.android.com/reference/android/graphics/Canvas.html
// http://developer.android.com/reference/android/graphics/Path.html

package flying.arrow ;

import android.app.Activity ;
import android.os.Bundle ;
import android.graphics.* ;  // Classes Canvas, Color, Paint, RectF, etc.
import android.view.View ;
import android.content.Context ;

final class FlyingArrowView extends View
{
   public FlyingArrowView( Context context ) 
   {
      super( context ) ;

      setBackgroundColor( 0xFFFFFFE0 ) ; // Light Yellow
   }
     
   @Override
   protected void onDraw( Canvas canvas ) 
   {
      Paint filling_paint = new Paint() ;
      filling_paint.setStyle( Paint.Style.FILL ) ;
      filling_paint.setColor( Color.MAGENTA ) ;

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

      //  The arrow coordinates are selected so that Point (0, 0)
      //  is at the tip of the arrow, and the arrow points upwards.

      int[]  arrow_shape_coordinates_x  =
             { 0,  15,   5,   5,  15,   0, -15,  -5,  -5, -15 } ;

      int[]  arrow_shape_coordinates_y  =
             { 0,  40,  30, 120, 160, 130, 160, 120,  30,  40 } ;

      Path  flying_arrow  =  new  Path() ;

      flying_arrow.moveTo( arrow_shape_coordinates_x[ 0 ],
                           arrow_shape_coordinates_y[ 0 ] ) ;

      for ( int point_index  =  1 ;
                point_index  <  arrow_shape_coordinates_x.length ;
                point_index  ++ )
      {
         flying_arrow.lineTo( arrow_shape_coordinates_x[ point_index ],
                              arrow_shape_coordinates_y[ point_index ] ) ;
      }

      flying_arrow.close() ;

      canvas.translate( 150, 250 ) ;        // arrow tip to point (150, 250 )
      canvas.drawPath( flying_arrow, filling_paint ) ; // draw solid arrow

      canvas.rotate( 45 ) ;                            // 45 degrees clockwise
      canvas.drawPath( flying_arrow, outline_paint ) ; // draw a hollow arrow
      canvas.translate( 0, -200 ) ;                    // flying "up" 200 points
      canvas.drawPath( flying_arrow, filling_paint ) ;

      // If you are running this program on an Android device that has
      // a wide screen, try to de-comment the lines below that are
      // commented out.
      
      canvas.rotate( 45 ) ;                            // 45 degrees clockwise
      //canvas.translate( 0, -200 ) ;   // flying "up" (i.e. to the right)
      canvas.drawPath( flying_arrow, filling_paint ) ;

      //canvas.translate( 0, -100 ) ;   // flying "up" 100 points
      canvas.rotate( 90 ) ;                            // 90 degrees clockwise
      canvas.scale( 1.5F, 1.5F ) ;      // magnify everything by 1.5
      canvas.drawPath( flying_arrow, outline_paint ) ; // draw a hollow arrow
      canvas.translate( 0, -200 ) ;     // flying "up" (i.e. down) 300 points
      canvas.drawPath( flying_arrow, filling_paint ) ;

   }
}


public class FlyingArrowActivity extends Activity
{
   FlyingArrowView flying_arrow_view;

   @Override
   public void onCreate( Bundle savedInstanceState )
   {
       super.onCreate( savedInstanceState ) ;
          
       flying_arrow_view = new FlyingArrowView( this ) ;
        
       setContentView( flying_arrow_view ) ;
   }
}