Node groups

extends Node

const COLS: int = 12
const ROWS: int = 6
const CELL: float = 74.0
const GAP: float = 8.0
const TICK: float = 0.17
const BANDS: Array = [
	{group = 'band_0', tint = '#8da5f3'},
	{group = 'band_1', tint = '#8eef97'},
	{group = 'band_2', tint = '#fc7f7f'},
	{group = 'band_3', tint = '#f3d48d'},
]

var status: Label
var elapsed: float = 0.0
var turn: int = 0


func _ready() -> void:
	_add_background()
	_add_cells()
	_add_panel()

	print('the bands take turns on their own, every button is one call_group')


func _process(delta: float) -> void:
	elapsed += delta

	if elapsed < TICK:
		return

	elapsed = 0.0
	turn += 1

	if turn % 9 == 0:
		_call_everyone()
		return

	_call_band(turn % BANDS.size())


func _call_band(index: int) -> void:
	var band: Dictionary = BANDS[index]
	get_tree().call_group(band.group, 'flash', Color(band.tint))
	status.text = 'call_group("%s", "flash") reached %d nodes' % [band.group, get_tree().get_nodes_in_group(band.group).size()]


func _call_everyone() -> void:
	get_tree().call_group('cells', 'flash', Color('#ffffff'))
	status.text = 'call_group("cells", "flash") reached %d nodes' % get_tree().get_nodes_in_group('cells').size()


func _add_cells() -> void:
	var cell_script: GDScript = Get.script('cell')
	var step: float = CELL + GAP
	var origin: Vector2 = Vector2((1280.0 - COLS * step + GAP) * 0.5, 720.0 - ROWS * step - 16.0)

	for row in ROWS:
		for col in COLS:
			var cell: Polygon2D = Polygon2D.new()
			cell.set_script(cell_script)
			cell.position = origin + Vector2(col * step, row * step)
			cell.add_to_group('cells')
			cell.add_to_group(BANDS[(col + row) % BANDS.size()].group)
			add_child(cell)
			cell.setup(CELL)


func _add_panel() -> void:
	var margin: MarginContainer = MarginContainer.new()

	for side in ['margin_left', 'margin_top']:
		margin.add_theme_constant_override(side, 40)

	add_child(margin)
	margin.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)

	var column: VBoxContainer = VBoxContainer.new()
	column.add_theme_constant_override('separation', 12)
	margin.add_child(column)

	var title: Label = Label.new()
	title.text = 'One call, seventy two nodes'
	title.add_theme_font_size_override('font_size', 28)
	column.add_child(title)

	var hint: Label = Label.new()
	hint.text = 'Every square joined a band with add_to_group. Nothing here keeps a reference to a single one of them.'
	hint.add_theme_color_override('font_color', Color('#8a90a0'))
	column.add_child(hint)

	var row: HBoxContainer = HBoxContainer.new()
	row.add_theme_constant_override('separation', 10)
	column.add_child(row)

	for i in BANDS.size():
		var button: Button = Button.new()
		button.text = BANDS[i].group
		button.pressed.connect(_call_band.bind(i))
		row.add_child(button)

	var all: Button = Button.new()
	all.text = 'cells'
	all.pressed.connect(_call_everyone)
	row.add_child(all)

	status = Label.new()
	status.add_theme_color_override('font_color', Color('#8eef97'))
	status.text = 'waiting for the first call'
	column.add_child(status)


func _add_background() -> void:
	var background: ColorRect = ColorRect.new()
	background.color = Color('#12141a')
	add_child(background)
	background.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)

extends Polygon2D

const IDLE: Color = Color('#2a2f3d')

var glow: float = 0.0
var lit: Color = IDLE


func setup(size: float) -> void:
	polygon = PackedVector2Array([Vector2.ZERO, Vector2(size, 0), Vector2(size, size), Vector2(0, size)])
	color = IDLE


func flash(tint: Color) -> void:
	lit = tint
	glow = 1.0


func _process(delta: float) -> void:
	if glow <= 0.0:
		return

	glow = maxf(glow - delta * 4.0, 0.0)
	color = IDLE.lerp(lit, glow)