gem.gd

extends KinematicBody2D

const GRAVITY = 100.0 
var velocity = Vector2()
var gravity

func _ready():
	randomize()
	set_fixed_process(true)
	start_gravity()
	add_collision_exception_with(get_node("/root/World/roof"))
	set_pos(Vector2(randf()*256, -20))
	var enemies=get_node("/root/World/Enemies")
	var children=enemies.get_child_count()
	for j in range(0, children):
		add_collision_exception_with(enemies.get_child(j))
	

func _fixed_process(delta):
	var force = Vector2(0, gravity)
	velocity += force*delta
	var motion = velocity*delta

	motion = move(motion)
	
	if(is_colliding()):
		var n=get_collision_normal()
		motion=n.slide(motion)
		velocity=n.slide(velocity)
		if(velocity.x==0 and velocity.y==0):
			stop_gravity()
		move(motion)
	if not get_parent().get_name()=="Player":
		var pos=get_pos()
		var right_limit=256
		var left_limit=0
		if(pos.x < left_limit):
			set_pos(pos+Vector2(right_limit,0))
		elif(pos.x > right_limit):
			set_pos(pos-Vector2(right_limit, 0))


func stop_gravity():
	gravity=0

func start_gravity():
	gravity=GRAVITY