harrypotter.gd

extends Polygon2D

onready var line = $Line2D

onready var collision_polygon_area = $Collision_Trigger/collision_polygon_area
export (int) var h_point_count = 5
var width

# distance between to vertical points
export (float) var v_offset = 10 #10
export (float) var v_offset_trigger = 8 # Default: 2

export (int) var y_min_offset = -30
export (int) var y_max_offset = 30

# list of points that form the cracks shape
var vertices = PoolVector2Array()

var filled = false

func _ready():
	line.visible = false
	randomize()
	
	var line_start = line.points[0]
	var line_end = line.points[1]

	width = line_start.distance_to(line_end)
	
	var h_space = width / (h_point_count - 1)
	
	vertices.append(line_start)
	
	for i in range(1, h_point_count-1):
		vertices.append(Vector2(h_space * i,0 + rand_range(y_min_offset, y_max_offset)))
	
	vertices.append(line_end)
	
	# trigger_vertices form the trigger area above the actual polygon shape
	var trigger_vertices = vertices
	
		
	# use the upper part of the polygon to create
	# the segments used for collisions
	for i in range(0, trigger_vertices.size()-1):
		var segment = SegmentShape2D.new()
		segment.a = trigger_vertices[i]
		segment.b = trigger_vertices[i+1]

		var collision_shape = CollisionShape2D.new()
		collision_shape.set_shape(segment)
		collision_shape.set_one_way_collision(true)
		$StaticBody2D.add_child(collision_shape)

	# now, add the bottom part of the polygon
	for j in range(vertices.size()-2, 0, -1):
		var v = vertices[j]
		vertices.append(Vector2(v.x, v.y + v_offset))
	
	trigger_vertices.append(Vector2(line_end.x, line_end.y + v_offset_trigger))
	
	for j in range(trigger_vertices.size()-2, 0, -1):
		var v = trigger_vertices[j]
		trigger_vertices.append(Vector2(v.x, v.y + v_offset_trigger))
		
	trigger_vertices.append(Vector2(line_start.x, line_end.y + v_offset_trigger))
	
	set_polygon(vertices)
	collision_polygon_area.set_polygon(trigger_vertices)

	$Collision_Trigger.position.y += -15 # Default: -5
	

func fill():
	if !filled:
		$AnimationPlayer.play("fill")
	filled = true