7.6 Add collision groups and check for collision

seven_six.monkey

  Field last_enemy_time:Float
  Field next_enemy_interval:Float

  ' create named collision groups  
  Const PLAYER_GROUP:Int = 1
  Const ENEMY_GROUP:Int = 2
  
  Method OnCreate()
    Self.engine = New ftEngine
    
    default_scene = engine.GetDefaultScene()
    default_layer = engine.GetDefaultLayer()
    
    Local box:ftObject = Self.engine.CreateBox(120, 20, engine.GetCanvasWidth()/2, engine.GetCanvasHeight()/2)
    box.SetColor(0, 70, 70)
    box.SetMaxSpeed(20.0)
    box.SetMinSpeed(-20.0)
    ' Set the collision group the player character is part of
    ' and the collsion type
    box.SetColGroup(PLAYER_GROUP)
    box.SetColType(Self.engine.ctBox)
    
    Self.player = New Character(box, True)
    
    Self.enemies = New List<Character>()
    Self.last_enemy_time = Millisecs()
    Self.next_enemy_interval = 3000
    Seed = Millisecs()
  End
  
  Method OnUpdate()
  	Local time_delta:Float = Float(engine.CalcDeltaTime())/60.0
  	 
  	If ((Millisecs() - Self.last_enemy_time) > Self.next_enemy_interval)
  		CreateEnemy()
  		Self.last_enemy_time = Millisecs()
  	End
  	
  	player.Update(engine.GetCanvasWidth(), engine.GetCanvasHeight())
  	
  	If engine.GetPaused() = False
		  engine.Update(time_delta)
      ' Tell the engine to check for collisions
		  engine.CollisionCheck()
	  End
  End
  
  Method CreateEnemy()
  	Local rand_width:Float = Rnd(3, 7) * 10
  	Local rand_height:Float = Rnd(3, 7) * 10
  	Local rand_y:Float = Rnd(rand_height, Self.engine.GetCanvasHeight())
  
  	Local box:ftObject = Self.engine.CreateBox(rand_width, rand_height, Self.engine.GetCanvasWidth(), rand_y)
  	
  	Local rand_color:Float = Rnd(0, 3)
  	Local colors:Int[] = [0, 0, 0]
  	If (rand_color <= 1.0)
  		colors = [255, 0, 0]
  	Else If (rand_color > 1.0 And rand_color <= 2.0)
  		colors = [0, 255, 0]
  	Else
  		colors = [0, 0, 255]
  	End
  	
  	box.SetColor(colors[0], colors[1], colors[2])
  	box.SetSpeedX(Rnd(10, 30) * -1)
  	' We add the enemy box to the enemy collision group
  	' and make it able to collide with the player
  	box.SetColGroup(ENEMY_GROUP)
  	box.SetColWith(PLAYER_GROUP, True)
  	enemies.AddLast(New Character(box))
  	
  	Self.next_enemy_interval = Rnd(0, 3) * 1000
  End