Kace/godot/component/entity/ball/Ball.gd

class_name Ball
extends RigidBody2D

export (Color) var interrupt_color = Color.white


signal kace_contact


const brick_layer = 2
const interrupt_speed = 700
const cell_size = Vector2(20, 10)
const max_penetration = 1.0
const contact_corrector = cell_size - Vector2(max_penetration, max_penetration)
const redundant_ceil = 0.9 # 0.5 < x < 1.0


var last_normal:Vector2 = Vector2(0.0, 0.0)


func interrupt_ball():
	modulate = interrupt_color
	go_down_unstopped()


func go_down_unstopped():
	linear_velocity.y = interrupt_speed
	linear_velocity = linear_velocity.normalized() * interrupt_speed
	set_collision_mask_bit(brick_layer, false)


func filter_new_contact(new_normal):
	var is_new_contact = last_normal.dot(new_normal) < redundant_ceil
	last_normal = new_normal
	return is_new_contact


func _integrate_forces(state :  Physics2DDirectBodyState):
	for i in range(state.get_contact_count()):
		var contact_normal = state.get_contact_local_normal(i)
		if filter_new_contact(contact_normal):
			var contact_pos = state.get_contact_local_position(i)
			var correct_pos = contact_pos - contact_normal * contact_corrector
			emit_signal("kace_contact", correct_pos)


func _on_Launcher_interrupt_wave():
	interrupt_ball()


func _on_Ball_body_exited(body: Node):
	if body.has_method("impact"):
		body.impact(position)