class_name TileMarker
extends Node2D
## Outlines the tile under the mouse: green when the figure can reach it,
## red when it is too far away.

const REACHABLE_COLOR := Color(0.4, 1.0, 0.4)
const UNREACHABLE_COLOR := Color(1.0, 0.4, 0.4)

var tile := Vector2i(-1, -1)
var in_reach := false


## Moves the outline to `new_tile`. Redraws only when something changed.
func show_tile(new_tile: Vector2i, reachable: bool) -> void:
	if new_tile == tile and reachable == in_reach:
		return
	tile = new_tile
	in_reach = reachable
	queue_redraw()


func _draw() -> void:
	var size := GridMotion.TILE_SIZE
	var color := REACHABLE_COLOR if in_reach else UNREACHABLE_COLOR
	draw_rect(Rect2(Vector2(tile) * size, Vector2(size, size)), color, false, 1.0)