extends Node2D
## KINETIC+HEAT chemistry proc marker: the two tag hues visibly meet
## at the point of impact (canon feedback stack — the light and the
## sting are the noun; no proc text, ever). Oriented along the impact
## axis: KINETIC steel-blue sweeps in from the striker side, HEAT
## orange flares out the struck side, white core where they touch.

var axis := Vector2.RIGHT
var duration := 0.28
var max_r := 26.0

var _t := 0.0


func _process(delta: float) -> void:
	_t += delta
	queue_redraw()
	if _t >= duration:
		queue_free()


func _draw() -> void:
	var k := clampf(_t / duration, 0.0, 1.0)
	var a := 1.0 - k
	var r := lerpf(6.0, max_r, k)
	var ang := axis.angle()
	draw_arc(Vector2.ZERO, r, ang + PI - 1.2, ang + PI + 1.2, 20, Color(0.75, 0.85, 0.95, a), 3.0)
	draw_arc(Vector2.ZERO, r * 0.8, ang - 1.2, ang + 1.2, 20, Color(0.95, 0.55, 0.2, a), 3.0)
	draw_circle(Vector2.ZERO, lerpf(5.0, 1.0, k), Color(1, 1, 1, a))