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+#warning-ignore-all:integer_division
+extends Node
+
+class_name HexBoard, "res://godot/HexBoard.png"
+
+enum Orientation { E=1, NE=2, N=4, NW=8, W=16, SW=32, S=64, SE=128 }
+
+var bt : Vector2	# bottom corner
+var cr : Vector2	# column, row
+
+var v : bool		# hex have a vertical edje
+
+var s : float		# hex side length
+var w : float		# hex width between 2 parallel sides
+var h : float		# hex height from the bottom of the middle rectangle to the top of the upper edje
+var dw : float		# half width
+var dh : float		# half height (from the top ef tho middle rectangle to the top of the upper edje)
+var m : float		# dh / dw
+var im : float		# dw / dh
+var tl : int		# num of hexes in 2 consecutives rows
+
+var tile_factory_fct : FuncRef
+var angles : Dictionary
+
+func configure(cols : int, rows : int, side : float, v0 : Vector2, vertical : bool) -> void:
+	v = vertical
+	s = side
+	w  = s * 1.73205
+	dw = w / 2.0
+	dh = s / 2.0
+	h  = s + dh
+	m = dh / dw
+	im = dw / dh
+	if v:
+		bt = v0
+		cr = Vector2(cols, rows)
+	else:
+		bt = v0
+		cr = Vector2(rows, cols)
+	tl = (2 * int(cr.x) - 1)
+	angles = {}
+	if v:
+		angles[Orientation.E] = 0
+		angles[Orientation.NE] = 60
+		angles[Orientation.NW] = 120
+		angles[Orientation.W] = 180
+		angles[Orientation.SW] = 240
+		angles[Orientation.SE] = 300
+	else:
+		angles[Orientation.NE] = 30
+		angles[Orientation.N] = 90
+		angles[Orientation.NW] = 150
+		angles[Orientation.SW] = 210
+		angles[Orientation.S] = 270
+		angles[Orientation.SE] = 330
+
+func size() -> int:
+	return int(cr.y) / 2 * tl + int(cr.y) % 2 * int(cr.x)
+
+func get_tile(coords : Vector2) -> Tile:
+	return tile_factory_fct.call_func(coords, key(coords))
+
+func to_angle(o : int) -> int:
+	return angles.get(o, -1)
+
+func to_orientation(a : float) -> int:
+	for k in angles.keys():
+		if angles[k] == a:
+			return k
+	return -1
+
+func angle(from : Tile, to : Tile) -> int:
+	var a : float = rad2deg((to.position - from.position).angle()) + 2
+	if a < 0: a += 360
+	return int(a / 10) * 10
+
+func opposite(o : int) -> int:
+	if o <= Orientation.NW: return o << 4
+	return o >> 4
+
+func key(coords : Vector2) -> int:
+	if not is_on_map(coords): return -1
+	if v: return _key(int(coords.x), int(coords.y))
+	else: return _key(int(coords.y), int(coords.x))
+
+func _key(x : int, y : int) -> int:
+	var n : int = y / 2
+	var i : int =  x - n + n * tl
+	if (y % 2) != 0:
+		i += (int(cr.x) - 1)
+	return i
+
+func is_on_map(coords : Vector2) -> bool:
+	if v: return _is_on_map(int(coords.x), int(coords.y))
+	else: return _is_on_map(int(coords.y), int(coords.x))
+
+func _is_on_map(x : int, y : int) -> bool:
+	if (y < 0) || (y >= int(cr.y)): return false
+	if (x < ((y + 1) / 2)) || (x >= (int(cr.x) + (y / 2))): return false
+	return true
+
+func center_of(coords : Vector2) -> Vector2:
+	if v: return Vector2(bt.x + dw + (coords.x * w) - (coords.y * dw), bt.y + dh + (coords.y * h))
+	else: return Vector2(bt.y + dh + (coords.x * h), bt.x + dw + (coords.y * w) - (coords.x * dw))
+
+func to_map(r : Vector2) -> Vector2:
+	if v: return _to_map(r.x, r.y, false)
+	else: return _to_map(r.y, r.x, true)
+
+func _to_map(x : float, y : float, swap : bool) -> Vector2:
+	var col : int = -1
+	var row : int = -1
+	# compute row
+	var dy : float = y - bt.y
+	row = int(dy / h)
+	if dy < 0:
+		row -= 1
+	# compute col
+	var dx : float = x - bt.x + (row * dw);
+	col = int(dx / w)
+	if dx < 0:
+		col -= 1
+	# upper rectangle or hex body
+	if dy > ((row * h) + s):
+		dy -= ((row * h) + s)
+		dx -= (col * w)
+		# upper left or right rectangle
+		if dx < dw:
+			if dy > (dx * m):
+				# upper left hex
+				row += 1
+		else:
+			if dy > ((w - dx) * m):
+				# upper right hex
+				row += 1
+				col += 1
+	if swap: return Vector2(row, col)
+	else: return Vector2(col, row)
+
+func distance(p0 : Vector2, p1 : Vector2, euclidean : bool = true) -> float:
+	var dx : int = int(p1.x - p0.x)
+	var dy : int = int(p1.y - p0.y)
+	if euclidean:
+		if dx == 0: return abs(dy)
+		elif dy == 0 || dx == dy: return abs(dx)
+		var fdx : float = dx - dy / 2;
+		var fdy : float = dy * 0.86602
+		return sqrt((fdx * fdx) + (fdy * fdy))
+	else:
+		var dz : float = abs((p0.x - p0.y) - (p1.x - p1.y))
+		if dx > dy:
+			if dx > dz : return abs(dx)
+		else:
+			if dy > dz: return abs(dy)
+		return dz
+
+# http://zvold.blogspot.com/2010/01/bresenhams-line-drawing-algorithm-on_26.html
+# http://zvold.blogspot.com/2010/02/line-of-sight-on-hexagonal-grid.html
+func line_of_sight(p0 : Vector2, p1 : Vector2, tiles : Array) -> Vector2:
+	tiles.clear()
+	# orthogonal projection
+	var ox0 : float = p0.x - (p0.y + 1) / 2
+	var ox1 : float = p1.x - (p1.y + 1) / 2
+	var dy : int = int(p1.y) - int(p0.y)
+	var dx : float = ox1 - ox0
+	# quadrant I && III
+	var q13 : bool = (dx >= 0 && dy >= 0) || (dx < 0 && dy < 0)
+	# is positive
+	var xs : int = 1
+	var ys : int = 1
+	if dx < 0: xs = -1
+	if dy < 0: ys = -1
+	# dx counts half width
+	dy = int(abs(dy))
+	dx = abs(2 * dx)
+	var dx3 : int = int(3 * dx)
+	var dy3 : int = 3 * dy
+	# check for diagonals
+	if dx == 0 || dx == dy3:
+		return diagonal_los(p0, p1, (dx == 0), q13, tiles)
+	# angle is less than 45°
+	var flat : bool = dx > dy3
+	var x : int = int(p0.x)
+	var y : int = int(p0.y);
+	var e : int = int(-2 * dx)
+	var from : Tile = get_tile(p0)
+	var to : Tile = get_tile(p1)
+	var d : float = distance(p0, p1)
+	tiles.append(from)
+	from.blocked = false
+	var ret : Vector2 = Vector2(-1, -1)
+	var contact : bool = false
+	var los_blocked : bool = false
+	while (x != p1.x) or (y != p1.y):
+		if e > 0:
+			# quadrant I : up left
+			e -= (dy3 + dx3)
+			y += ys
+			if not q13: x -= xs
+		else:
+			e += dy3
+			if (e > -dx) or (not flat && (e == -dx)):
+				# quadrant I : up right
+				e -= dx3
+				y += ys
+				if q13: x += xs
+			elif e < -dx3:
+				# quadrant I : down right
+				e += dx3
+				y -= ys
+				if not q13: x += xs
+			else:
+				# quadrant I : right
+				e += dy3
+				x += xs
+		var q : Vector2 = Vector2(x, y)
+		var t : Tile = get_tile(q)
+		if los_blocked and not contact:
+			var o : int = to_orientation(angle(tiles[tiles.size() - 1], t))
+			ret = compute_contact(from.position, to.position, o, t.position, true)
+			contact = true
+		tiles.append(t)
+		t.blocked = los_blocked
+		los_blocked = los_blocked or t.block_los(from, to, d, distance(p0, q))
+	return ret
+
+func diagonal_los(p0 : Vector2, p1 : Vector2, flat : bool, q13 : bool, tiles : Array) -> Vector2:
+	var dy : int = 1 if p1.y > p0.y else -1
+	var dx : int = 1 if p1.x > p0.x else -1
+	var x : int = int(p0.x)
+	var y : int = int(p0.y)
+	var from : Tile = get_tile(p0);
+	var to : Tile = get_tile(p1);
+	var d : float = distance(p0, p1)
+	tiles.append(from);
+	from.blocked = false;
+	var ret : Vector2 = Vector2(-1, -1)
+	var blocked : int = 0
+	var contact : bool = false
+	var los_blocked : bool = false
+	while (x != p1.x) or (y != p1.y):
+		var idx : int = 4
+		if flat: y += dy	# up left
+		else: x += dx		# right
+		var q : Vector2 = Vector2(x, y)
+		var t : Tile = get_tile(q)
+		if t.on_board:
+			tiles.append(t)
+			t.blocked = los_blocked
+			if t.block_los(from, to, d, distance(p0, q)):
+				blocked |= 0x01
+		else:
+			blocked |= 0x01
+			idx = 3
+
+		if flat: x += dx	# up right
+		else:
+			y += dy		# up right
+			if not q13: x -= dx
+		q = Vector2(x, y)
+		t = get_tile(q)
+		if t.on_board:
+			tiles.append(t)
+			t.blocked = los_blocked
+			if t.block_los(from, to, d, distance(p0, q)):
+				blocked |= 0x02
+		else:
+			blocked |= 0x02
+			idx = 3
+
+		if flat: y += dy	# up
+		else: x += dx 		# diagonal
+		q = Vector2(x, y)
+		t = get_tile(q)
+		tiles.append(t)
+		t.blocked = los_blocked || blocked == 0x03
+		if t.blocked and not contact:
+			var o : int = compute_orientation(dx, dy, flat)
+			if not los_blocked and blocked == 0x03:
+				ret = compute_contact(from.position, to.position, o, t.position, false)
+			else:
+				ret = compute_contact(from.position, to.position, opposite(o), tiles[tiles.size() - idx].position, false)
+			contact = true;
+		los_blocked = t.blocked || t.block_los(from, to, d, distance(p0, q))
+	return ret
+
+func compute_orientation(dx :int, dy :int, flat : bool) -> int:
+	if flat:
+		if v: return Orientation.N if dy == 1 else Orientation.S
+		else: return Orientation.NE if dy == 1 else Orientation.SW
+	if dx == 1:
+		if dy == 1: return Orientation.NE if v else Orientation.E
+		else: return Orientation.SE
+	else:
+		if dy == 1: return Orientation.NW
+		else: return Orientation.SW if v else Orientation.W
+
+func compute_contact(from : Vector2, to : Vector2, o : int, t : Vector2, line : bool) -> Vector2:
+	var dx : float = to.x - from.x
+	var dy : float = to.y - from.y
+	var n : float = 9999999999.0 if dx == 0 else (dy / dx)
+	var c : float = from.y - (n * from.x)
+	if v:
+		if o == Orientation.N: return Vector2(t.x, t.y - s)
+		elif o == Orientation.S: return Vector2(t.x, t.y + s)
+		elif o == Orientation.E:
+			var x : float = t.x - dw
+			return Vector2(x, from.y + n * (x - from.x))
+		elif o == Orientation.W:
+			var x : float = t.x + dw
+			return Vector2(x, from.y + n * (x - from.x))
+		else:
+			if line:
+				var p : float = m if (o == Orientation.SE or o == Orientation.NW) else -m
+				var k : float = t.y - p * t.x
+				if o == Orientation.SE || o == Orientation.SW: k += s
+				else: k -= s
+				var x : float = (k - c) / (n - p)
+				return Vector2(x, n * x + c)
+			else:
+				var x : float = t.x + (-dw if (o == Orientation.NE or o == Orientation.SE) else dw)
+				var y : float = t.y + (dh if (o == Orientation.SE or o == Orientation.SW) else -dh)
+				return Vector2(x, y)
+	else:
+		if o == Orientation.E: return Vector2(t.x - s, t.y)
+		elif o == Orientation.W: return Vector2(t.x + s, t.y)
+		elif o == Orientation.N:
+			var y : float = t.y - dw
+			return Vector2(from.x + (y - from.y) / n, y)
+		elif o == Orientation.S:
+			var y : float = t.y + dw
+			return Vector2(from.x + (y - from.y) / n, y)
+		else:
+			if line:
+#				o = 1
+				var p : float = im if (o == Orientation.SE or o == Orientation.NW) else -im
+				var k : float = 0
+				if o == Orientation.SW or o == Orientation.NW: k = t.y - (p * (t.x + s))
+				else: k = t.y - (p * (t.x - s))
+				var x : float = (k - c) / (n - p)
+				return Vector2(x, n * x + c);
+			else:
+				var x : float = t.x + (dh if (o == Orientation.NW || o == Orientation.SW) else -dh)
+				var y : float = t.y + (dw if (o == Orientation.SE || o == Orientation.SW) else -dw)
+				return Vector2(x, y)