asteroid.gd

extends KinematicBody2D

export var bounce = 1.1

var size
var vel = Vector2()
var rot_speed
var screen_size
var extents
onready var puff = get_node('puff')
var textures = {'big': ['res://art/sheet.meteorGrey_big1.atex',
						'res://art/sheet.meteorGrey_big2.atex',
						'res://art/sheet.meteorGrey_big3.atex'],
				'med': ['res://art/sheet.meteorGrey_med1.atex',
						'res://art/sheet.meteorGrey_med2.atex'],
				'sm':  ['res://art/sheet.meteorGrey_small1.atex',
						'res://art/sheet.meteorGrey_small2.atex'],
				'tiny': ['res://art/sheet.meteorGrey_tiny1.atex',
						 'res://art/sheet.meteorGrey_tiny2.atex']}

func _ready():
	randomize()
	set_fixed_process(true)
	screen_size = get_viewport_rect().size
	add_to_group("asteroids")
	
func init(init_size, init_pos, init_vel):
	size = init_size
	if init_vel.lentgh() > 0:
		vel = init_vel
	else:
		vel = Vector2(rand_range(30, 100), 0).rotated(rand_range(0, 2*PI))
	rot_speed = rand_range(-1.5, 1.5)
	var texture = load(textures[size][randi() % textures[size].size()])
	get_node("Sprite").set_texture(texture)
	extents = texture.get_size() / 2
	set_pos(init_pos)
	var shape = CircleShape2D.new()
	shape.set_radius(min(texture.get_width() / 2, texture.get_height() / 2))
	add_shape(shape)
	
func _fixed_process(delta):
	set_rot(get_rot() + rot_speed * delta)
	move(vel * delta)
	if is_colliding():
		vel += get_collision_normal() * (get_collider().vel.length() * bounce)
		puff.set_global_pos(get_collision_pos())
		puff.set_emitting(true)
	var pos = get_pos()
	if pos.x > screen_size.width + extents.width:
		pos.x = -extents.width
	if pos.x < -extents.width:
		pos.x = screen_size.width + extents.width
	if pos.y > screen_size.height + extents.height:
		pos.y = -extents.height
	if pos.y < -extents.height:
		pos.y = screen_size.height + extents.height
	set_pos(pos)
	
func explode():
	queue_free()