Added a new line tool

One of the most requested tools has finally been added!

assets/graphics/blue_themes/tools/linetool.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/linetool.png-4ed7f0aa497e149a9bb715508e7b79d1.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/blue_themes/tools/linetool.png"
+dest_files=[ "res://.import/linetool.png-4ed7f0aa497e149a9bb715508e7b79d1.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=false
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

assets/graphics/cursor_icons/linetool_cursor.png.import

@@ -0,0 +1,13 @@
+[remap]
+
+importer="image"
+type="Image"
+path="res://.import/linetool_cursor.png-38c59a143cf71cc8a7903919aba16145.image"
+
+[deps]
+
+source_file="res://assets/graphics/cursor_icons/linetool_cursor.png"
+dest_files=[ "res://.import/linetool_cursor.png-38c59a143cf71cc8a7903919aba16145.image" ]
+
+[params]
+

assets/graphics/dark_themes/tools/linetool.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/linetool.png-49f0a0966a97070b2c54583188740fb8.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/dark_themes/tools/linetool.png"
+dest_files=[ "res://.import/linetool.png-49f0a0966a97070b2c54583188740fb8.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=false
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

assets/graphics/light_themes/tools/linetool.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/linetool.png-41d8bda5991aa6c858e29d67515cdd5f.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/light_themes/tools/linetool.png"
+dest_files=[ "res://.import/linetool.png-41d8bda5991aa6c858e29d67515cdd5f.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=false
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

project.godot

@@ -556,6 +556,16 @@ alt={
 "events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":16777240,"unicode":0,"echo":false,"script":null)
  ]
 }
+left_linetool_tool={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":76,"unicode":0,"echo":false,"script":null)
+ ]
+}
+right_linetool_tool={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":true,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":76,"unicode":0,"echo":false,"script":null)
+ ]
+}
 
 [locale]
 

src/Autoload/Global.gd

@@ -547,6 +547,17 @@ Hold %s to make a line""") % [InputMap.get_action_list("left_eraser_tool")[0].as
 %s for left mouse button
 %s for right mouse button""") % [InputMap.get_action_list("left_lightdark_tool")[0].as_text(), InputMap.get_action_list("right_lightdark_tool")[0].as_text()]
 
+	var linetool : BaseButton = find_node_by_name(root, "LineTool")
+	linetool.hint_tooltip = tr("""Line Tool
+
+%s for left mouse button
+%s for right mouse button
+
+Hold %s to snap the angle of the line
+Hold %s to center the shape on the click origin
+Hold %s to displace the shape's origin""") % [InputMap.get_action_list("left_linetool_tool")[0].as_text(), InputMap.get_action_list("right_linetool_tool")[0].as_text(), "Shift", "Ctrl", "Alt"]
+
+
 	var recttool : BaseButton = find_node_by_name(root, "RectangleTool")
 	recttool.hint_tooltip = tr("""Rectangle Tool
 

src/Autoload/Tools.gd

@@ -50,6 +50,7 @@ var _tools = {
 	"Eraser" : "res://src/Tools/Eraser.tscn",
 	"Bucket" : "res://src/Tools/Bucket.tscn",
 	"LightenDarken" : "res://src/Tools/LightenDarken.tscn",
+	"LineTool" : "res://src/Tools/LineTool.tscn",
 	"RectangleTool" : "res://src/Tools/RectangleTool.tscn",
 	"EllipseTool" : "res://src/Tools/EllipseTool.tscn",
 }

src/Tools/LineTool.gd

@@ -0,0 +1,188 @@
+extends "res://src/Tools/Draw.gd"
+
+
+var _original_pos := Vector2.ZERO
+var _start := Vector2.ZERO
+var _offset := Vector2.ZERO
+var _dest := Vector2.ZERO
+var _drawing := false
+var _displace_origin := false
+var _thickness := 1
+
+
+func _init() -> void:
+	_drawer.color_op = Drawer.ColorOp.new()
+
+
+func _on_Thickness_value_changed(value: int) -> void:
+	_thickness = value
+	update_config()
+	save_config()
+
+
+func get_config() -> Dictionary:
+	var config := .get_config()
+	config["thickness"] = _thickness
+	return config
+
+
+func set_config(config: Dictionary) -> void:
+	.set_config(config)
+	_thickness = config.get("thickness", _thickness)
+
+
+func update_config() -> void:
+	.update_config()
+	$ThicknessSlider.value = _thickness
+	$ShapeThickness/ThicknessSpinbox.value = _thickness
+
+
+func _get_shape_points(_size: Vector2) -> PoolVector2Array:
+	return PoolVector2Array()
+
+
+func _get_shape_points_filled(_size: Vector2) -> PoolVector2Array:
+	return PoolVector2Array()
+
+
+func _input(event : InputEvent) -> void:
+	if _drawing:
+		if event.is_action_pressed("alt"):
+			_displace_origin = true
+		elif event.is_action_released("alt"):
+			_displace_origin = false
+
+
+func draw_start(position : Vector2) -> void:
+	Global.canvas.selection.transform_content_confirm()
+	update_mask()
+
+	_original_pos = position
+	_start = position
+	_offset = position
+	_dest = position
+	_drawing = true
+
+
+func draw_move(position : Vector2) -> void:
+	if _drawing:
+		if _displace_origin:
+			_original_pos += position - _offset
+		var d = _line_angle_constraint(_original_pos, position)
+		_dest = d.position
+		if Tools.control:
+			_start = _original_pos - (_dest - _original_pos)
+		else:
+			_start = _original_pos
+		cursor_text = d.text
+		_offset = position
+
+
+func draw_end(_position : Vector2) -> void:
+	if _drawing:
+		_draw_shape()
+
+		_original_pos = Vector2.ZERO
+		_start = Vector2.ZERO
+		_dest = Vector2.ZERO
+		_drawing = false
+		_displace_origin = false
+		cursor_text = ""
+
+
+func draw_preview() -> void:
+	if _drawing:
+		var canvas : CanvasItem = Global.canvas.previews
+		var indicator := BitMap.new()
+		var start := _start
+		if _start.x > _dest.x:
+			start.x = _dest.x
+		if _start.y > _dest.y:
+			start.y = _dest.y
+
+		var points := _get_points()
+		var t_offset := _thickness - 1
+		var t_offsetv := Vector2(t_offset, t_offset)
+		indicator.create((_dest - _start).abs() + t_offsetv * 2 + Vector2.ONE)
+
+		for point in points:
+			var p : Vector2 = point - start + t_offsetv
+			indicator.set_bit(p, 1)
+
+		canvas.draw_set_transform(start - t_offsetv, canvas.rotation, canvas.scale)
+
+		for line in _create_polylines(indicator):
+			canvas.draw_polyline(PoolVector2Array(line), tool_slot.color)
+
+		canvas.draw_set_transform(canvas.position, canvas.rotation, canvas.scale)
+
+
+func _draw_shape() -> void:
+#	var rect := _get_result_rect(origin, dest)
+	var points := _get_points()
+	prepare_undo()
+	for point in points:
+		# Reset drawer every time because pixel perfect sometimes breaks the tool
+		_drawer.reset()
+		# Draw each point offseted based on the shape's thickness
+		draw_tool(point)
+
+	commit_undo("Draw Shape")
+
+
+func _get_points() -> PoolVector2Array:
+	var array := []
+	var dx := int(abs(_dest.x - _start.x))
+	var dy := int(-abs(_dest.y - _start.y))
+	var err := dx + dy
+	var e2 := err << 1
+	var sx = 1 if _start.x < _dest.x else -1
+	var sy = 1 if _start.y < _dest.y else -1
+	var x = _start.x
+	var y = _start.y
+
+	var start := _start - Vector2.ONE * (_thickness >> 1)
+	var end := start + Vector2.ONE * _thickness
+	for yy in range(start.y, end.y):
+		for xx in range(start.x, end.x):
+			array.append(Vector2(xx, yy))
+
+	while !(x == _dest.x && y == _dest.y):
+		e2 = err << 1
+		if e2 >= dy:
+			err += dy
+			x += sx
+		if e2 <= dx:
+			err += dx
+			y += sy
+
+		var pos := Vector2(x, y)
+		start = pos - Vector2.ONE * (_thickness >> 1)
+		end = start + Vector2.ONE * _thickness
+		for yy in range(start.y, end.y):
+			for xx in range(start.x, end.x):
+				array.append(Vector2(xx, yy))
+
+	return PoolVector2Array(array)
+
+
+func _line_angle_constraint(start : Vector2, end : Vector2) -> Dictionary:
+	var result := {}
+	var angle := rad2deg(end.angle_to_point(start))
+	var distance := start.distance_to(end)
+	if Tools.shift:
+		angle = stepify(angle, 22.5)
+		if step_decimals(angle) != 0:
+			var diff := end - start
+			var v := Vector2(2 , 1) if abs(diff.x) > abs(diff.y) else Vector2(1 , 2)
+			var p := diff.project(diff.sign() * v).abs().round()
+			var f := p.y if abs(diff.x) > abs(diff.y) else p.x
+			end = start + diff.sign() * v * f - diff.sign()
+			angle = rad2deg(atan2(sign(diff.y) * v.y, sign(diff.x) * v.x))
+		else:
+			end = start + Vector2.RIGHT.rotated(deg2rad(angle)) * distance
+	angle *= -1
+	angle += 360 if angle < 0 else 0
+	result.text = str(stepify(angle, 0.01)) + "°"
+	result.position = end.round()
+	return result