// KeyEventWorld.java


import java.util.Random;

// ------------------------------------------------------------------------------
// represent the world of a Blob
class KeyEventWorld extends World {

   Blob blob;

   KeyEventWorld(Blob blob) {
     this.blob = blob;
   }

   // what happens when the player presses a key
   World onKeyEvent(String ke) {

     // return the new world with the moved blob
     return new KeyEventWorld(this.blob.moveBlob(ke));
   }

   // draw this world
   public boolean draw() {
     return this.blob.draw(this);
   }
}


/*
;                                 
;                                 
;                                 
;   ;;;;;  ;           ;          
;   ;    ; ;           ;          
;   ;    ; ;           ;          
;   ;   ;  ;    ;;;    ; ;;       
;   ;;;;   ;   ;   ;   ;;  ;      
;   ;   ;  ;  ;     ;  ;    ;     
;   ;    ; ;  ;     ;  ;    ;     
;   ;    ; ;  ;     ;  ;    ;     
;   ;    ; ;   ;   ;   ;;  ;      
;   ;;;;;  ;    ;;;    ; ;;       
;                                 
;                                 
;                                 
*/
// to represent a blob on the canvas
class Blob {
  Posn center;
  int radius;

  Blob(Posn center, int radius) {
    this.center = center;
    this.radius = radius;
  }

  // draw this blob in the given World
  boolean draw(World w) {
    return w.drawDisk(this.center, this.radius, new Red());
  } 

  // move this blob 20 pixels in the direction given by the ke
  Blob moveBlob(String ke){
    if (ke.equals("right"))
       return new Blob(new Posn(this.center.x + 20, this.center.y), 
                         this.radius);
    else if (ke.equals("left"))
       return new Blob(new Posn(this.center.x - 20, this.center.y), 
                         this.radius);
    else if (ke.equals("up"))
       return new Blob(new Posn(this.center.x, this.center.y - 20), 
                         this.radius);
    else if (ke.equals("down"))
       return new Blob(new Posn(this.center.x, this.center.y + 20), 
                         this.radius);
    else
       return this;
  }

  // determine whether this blob is the same as than given blob
  boolean same(Blob b){
    return this.center.x == b.center.x
        && this.center.y == b.center.y
        && this.radius == b.radius;
  }

 
  // run the tests and start the world
  public static void main(String[] argv){

    // Tests for the Blob class:
    Blob b1 = new Blob(new Posn(100, 100), 50);
    Blob b2 = b1.moveBlob("left");
    
    // construct an instance of a KeyEventWorld
    KeyEventWorld w = new KeyEventWorld(new Blob(new Posn(100, 200), 20));

   
    System.out.println(
  		"test moveBlob " + "\n" +
  		(b1.moveBlob("left").same(new Blob(new Posn(80, 100), 50))) + "\n" +
		(b1.moveBlob("right").same(new Blob(new Posn(120, 100), 50))) + "\n" +
		(b1.moveBlob("up").same(new Blob(new Posn(100, 80), 50))) + "\n" +
		
		"test moveDown " + "\n" +
		(b1.moveBlob("down").same(new Blob(new Posn(100, 120), 50))) + "\n"
		);

  
	// start the world, start the key event monitoring only
	boolean testWorld = w.start(200,400) 
                     && w.theWorld.bigBang(0.0, w, true, false);
  }


}