[Targeted for 0.11.0][Bug FIX] Mirror preview fix (#860)

* fix mirror previews

* Fix incorredt selection resizing of selection

in mirror mode

* Fix mirror previews (selection tools)

* typo

src/Tools/Draw.gd

@@ -221,6 +221,10 @@ func commit_undo() -> void:
 
 
 func draw_tool(position: Vector2) -> void:
+	if Global.mirror_view:
+		# Even brushes are not perfectly centred and are offseted by 1 px so we add it
+		if int(_stroke_dimensions.x) % 2 == 0:
+			position.x += 1
 	_prepare_tool()
 	var coords_to_draw := _draw_tool(position)
 	for coord in coords_to_draw:
@@ -313,6 +317,11 @@ func _draw_tool(position: Vector2) -> PoolVector2Array:
 # Bresenham's Algorithm
 # Thanks to https://godotengine.org/qa/35276/tile-based-line-drawing-algorithm-efficiency
 func draw_fill_gap(start: Vector2, end: Vector2) -> void:
+	if Global.mirror_view:
+		# Even brushes are not perfectly centred and are offseted by 1 px so we add it
+		if int(_stroke_dimensions.x) % 2 == 0:
+			start.x += 1
+			end.x += 1
 	var dx := int(abs(end.x - start.x))
 	var dy := int(-abs(end.y - start.y))
 	var err := dx + dy

src/Tools/Eraser.gd

@@ -53,6 +53,9 @@ func draw_start(position: Vector2) -> void:
 
 	_draw_line = Input.is_action_pressed("draw_create_line")
 	if _draw_line:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		_line_start = position
 		_line_end = position
 		update_line_polylines(_line_start, _line_end)
@@ -72,6 +75,9 @@ func draw_move(position: Vector2) -> void:
 		return
 
 	if _draw_line:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		var d := _line_angle_constraint(_line_start, position)
 		_line_end = d.position
 		cursor_text = d.text
@@ -90,6 +96,10 @@ func draw_end(position: Vector2) -> void:
 		return
 
 	if _draw_line:
+		if Global.mirror_view:
+			# now we revert back the coordinates from their mirror form so that line can be drawn
+			_line_start.x = (Global.current_project.size.x - 1) - _line_start.x
+			_line_end.x = (Global.current_project.size.x - 1) - _line_end.x
 		draw_tool(_line_start)
 		draw_fill_gap(_line_start, _line_end)
 		_draw_line = false

src/Tools/LineTool.gd

@@ -78,6 +78,9 @@ func draw_start(position: Vector2) -> void:
 	Global.canvas.selection.transform_content_confirm()
 	update_mask()
 
+	if Global.mirror_view:
+		# mirroring position is ONLY required by "Preview"
+		position.x = Global.current_project.size.x - position.x - 1
 	_original_pos = position
 	_start = position
 	_offset = position
@@ -94,6 +97,9 @@ func draw_move(position: Vector2) -> void:
 		return
 
 	if _drawing:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = Global.current_project.size.x - position.x - 1
 		if _displace_origin:
 			_original_pos += position - _offset
 		var d := _line_angle_constraint(_original_pos, position)
@@ -114,6 +120,17 @@ func draw_end(position: Vector2) -> void:
 		return
 
 	if _drawing:
+		if Global.mirror_view:
+			# now we revert back the coordinates from their mirror form so that line can be drawn
+			_original_pos.x = (Global.current_project.size.x - 1) - _original_pos.x
+			_start.x = (Global.current_project.size.x - 1) - _start.x
+			_offset.x = (Global.current_project.size.x - 1) - _offset.x
+			_dest.x = (Global.current_project.size.x - 1) - _dest.x
+			if _thickness % 2 == 0:
+				_original_pos.x += 1
+				_start.x += 1
+				_offset.x += 1
+				_dest.x += 1
 		_draw_shape()
 
 		_original_pos = Vector2.ZERO

src/Tools/Pencil.gd

@@ -116,6 +116,9 @@ func draw_start(position: Vector2) -> void:
 	_draw_line = Input.is_action_pressed("draw_create_line")
 	if _draw_line:
 		_spacing_mode = false  # spacing mode is disabled during line mode
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		_line_start = position
 		_line_end = position
 		update_line_polylines(_line_start, _line_end)
@@ -138,6 +141,9 @@ func draw_move(position: Vector2) -> void:
 
 	if _draw_line:
 		_spacing_mode = false  # spacing mode is disabled during line mode
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		var d := _line_angle_constraint(_line_start, position)
 		_line_end = d.position
 		cursor_text = d.text
@@ -159,6 +165,10 @@ func draw_end(position: Vector2) -> void:
 
 	if _draw_line:
 		_spacing_mode = false  # spacing mode is disabled during line mode
+		if Global.mirror_view:
+			# now we revert back the coordinates from their mirror form so that line can be drawn
+			_line_start.x = (Global.current_project.size.x - 1) - _line_start.x
+			_line_end.x = (Global.current_project.size.x - 1) - _line_end.x
 		draw_tool(_line_start)
 		draw_fill_gap(_line_start, _line_end)
 		_draw_line = false

src/Tools/SelectionTools/EllipseSelect.gd

@@ -52,14 +52,16 @@ func draw_preview() -> void:
 		var canvas: Node2D = Global.canvas.previews
 		var position := canvas.position
 		var scale := canvas.scale
+		var temp_rect = _rect
 		if Global.mirror_view:
 			position.x = position.x + Global.current_project.size.x
+			temp_rect.position.x = Global.current_project.size.x - temp_rect.position.x
 			scale.x = -1
 
-		var border := _get_shape_points_filled(_rect.size)
-		var indicator := _fill_bitmap_with_points(border, _rect.size)
+		var border := _get_shape_points_filled(temp_rect.size)
+		var indicator := _fill_bitmap_with_points(border, temp_rect.size)
 
-		canvas.draw_set_transform(_rect.position, canvas.rotation, scale)
+		canvas.draw_set_transform(temp_rect.position, canvas.rotation, scale)
 		for line in _create_polylines(indicator):
 			canvas.draw_polyline(PoolVector2Array(line), Color.black)
 

src/Tools/SelectionTools/PolygonSelect.gd

@@ -10,6 +10,8 @@ func _input(event: InputEvent) -> void:
 		return
 	if event is InputEventMouseMotion:
 		_last_position = Global.canvas.current_pixel.floor()
+		if Global.mirror_view:
+			_last_position.x = (Global.current_project.size.x - 1) - _last_position.x
 	elif event is InputEventMouseButton:
 		if event.doubleclick and event.button_index == tool_slot.button and _draw_points:
 			$DoubleClickTimer.start()

src/Tools/Shading.gd

@@ -224,6 +224,9 @@ func draw_start(position: Vector2) -> void:
 
 	_draw_line = Input.is_action_pressed("draw_create_line")
 	if _draw_line:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		_line_start = position
 		_line_end = position
 		update_line_polylines(_line_start, _line_end)
@@ -243,6 +246,9 @@ func draw_move(position: Vector2) -> void:
 		return
 
 	if _draw_line:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = (Global.current_project.size.x - 1) - position.x
 		var d := _line_angle_constraint(_line_start, position)
 		_line_end = d.position
 		cursor_text = d.text
@@ -261,6 +267,10 @@ func draw_end(position: Vector2) -> void:
 		return
 
 	if _draw_line:
+		if Global.mirror_view:
+			# now we revert back the coordinates from their mirror form so that line can be drawn
+			_line_start.x = (Global.current_project.size.x - 1) - _line_start.x
+			_line_end.x = (Global.current_project.size.x - 1) - _line_end.x
 		draw_tool(_line_start)
 		draw_fill_gap(_line_start, _line_end)
 		_draw_line = false

src/Tools/ShapeDrawer.gd

@@ -93,6 +93,9 @@ func draw_start(position: Vector2) -> void:
 	Global.canvas.selection.transform_content_confirm()
 	update_mask()
 
+	if Global.mirror_view:
+		# mirroring position is ONLY required by "Preview"
+		position.x = Global.current_project.size.x - position.x - 1
 	_start = position
 	_offset = position
 	_dest = position
@@ -108,6 +111,9 @@ func draw_move(position: Vector2) -> void:
 		return
 
 	if _drawing:
+		if Global.mirror_view:
+			# mirroring position is ONLY required by "Preview"
+			position.x = Global.current_project.size.x - position.x - 1
 		if _displace_origin:
 			_start += position - _offset
 		_dest = position
@@ -122,6 +128,16 @@ func draw_end(position: Vector2) -> void:
 		return
 
 	if _drawing:
+		if Global.mirror_view:
+			# now we revert back the coordinates from their mirror form so that shape can be drawn
+			_start.x = (Global.current_project.size.x - 1) - _start.x
+			_offset.x = (Global.current_project.size.x - 1) - _offset.x
+			_dest.x = (Global.current_project.size.x - 1) - _dest.x
+			if _thickness % 2 == 0:
+				_start.x += 1
+				_offset.x += 1
+				_dest.x += 1
+				position.x += 1
 		_draw_shape(_start, position)
 
 		_start = Vector2.ZERO

src/UI/Canvas/Selection.gd

@@ -11,6 +11,7 @@ var is_moving_content := false
 var arrow_key_move := false
 var is_pasting := false
 var big_bounding_rectangle := Rect2() setget _big_bounding_rectangle_changed
+var image_current_pixel := Vector2.ZERO  # The ACTUAL pixel coordinate of image
 
 var temp_rect := Rect2()
 var rect_aspect_ratio := 0.0
@@ -51,9 +52,15 @@ class Gizmo:
 		if direction == Vector2.ZERO:
 			return Input.CURSOR_POINTING_HAND
 		elif direction == Vector2(-1, -1) or direction == Vector2(1, 1):  # Top left or bottom right
-			cursor = Input.CURSOR_FDIAGSIZE
+			if Global.mirror_view:
+				cursor = Input.CURSOR_BDIAGSIZE
+			else:
+				cursor = Input.CURSOR_FDIAGSIZE
 		elif direction == Vector2(1, -1) or direction == Vector2(-1, 1):  # Top right or bottom left
-			cursor = Input.CURSOR_BDIAGSIZE
+			if Global.mirror_view:
+				cursor = Input.CURSOR_FDIAGSIZE
+			else:
+				cursor = Input.CURSOR_BDIAGSIZE
 		elif direction == Vector2(0, -1) or direction == Vector2(0, 1):  # Center top or center bottom
 			cursor = Input.CURSOR_VSIZE
 		elif direction == Vector2(-1, 0) or direction == Vector2(1, 0):  # Center left or center right
@@ -77,6 +84,9 @@ func _ready() -> void:
 
 
 func _input(event: InputEvent) -> void:
+	image_current_pixel = canvas.current_pixel
+	if Global.mirror_view:
+		image_current_pixel.x = Global.current_project.size.x - image_current_pixel.x
 	if not Global.can_draw:
 		return
 	if is_moving_content:
@@ -96,7 +106,7 @@ func _input(event: InputEvent) -> void:
 	var gizmo_hover: Gizmo
 	if big_bounding_rectangle.size != Vector2.ZERO:
 		for g in gizmos:
-			if g.rect.has_point(canvas.current_pixel):
+			if g.rect.has_point(image_current_pixel):
 				gizmo_hover = Gizmo.new(g.type, g.direction)
 				break
 
@@ -104,7 +114,7 @@ func _input(event: InputEvent) -> void:
 		if event.pressed:
 			if gizmo_hover and not dragged_gizmo:  # Select a gizmo
 				Global.has_focus = false
-				mouse_pos_on_gizmo_drag = canvas.current_pixel
+				mouse_pos_on_gizmo_drag = image_current_pixel
 				dragged_gizmo = gizmo_hover
 				if Input.is_action_pressed("transform_move_selection_only"):
 					transform_content_confirm()
@@ -304,14 +314,14 @@ func _gizmo_resize() -> void:
 	if Input.is_action_pressed("shape_center"):
 		# Code inspired from https://github.com/GDQuest/godot-open-rpg
 		if dir.x != 0 and dir.y != 0:  # Border gizmos
-			temp_rect.size = ((canvas.current_pixel - temp_rect_pivot) * 2.0 * dir)
+			temp_rect.size = ((image_current_pixel - temp_rect_pivot) * 2.0 * dir)
 		elif dir.y == 0:  # Center left and right gizmos
-			temp_rect.size.x = (canvas.current_pixel.x - temp_rect_pivot.x) * 2.0 * dir.x
+			temp_rect.size.x = (image_current_pixel.x - temp_rect_pivot.x) * 2.0 * dir.x
 		elif dir.x == 0:  # Center top and bottom gizmos
-			temp_rect.size.y = (canvas.current_pixel.y - temp_rect_pivot.y) * 2.0 * dir.y
+			temp_rect.size.y = (image_current_pixel.y - temp_rect_pivot.y) * 2.0 * dir.y
 		temp_rect = Rect2(-1.0 * temp_rect.size / 2 + temp_rect_pivot, temp_rect.size)
 	else:
-		_resize_rect(canvas.current_pixel, dir)
+		_resize_rect(image_current_pixel, dir)
 
 	if Input.is_action_pressed("shape_perfect") or resize_keep_ratio:  # Maintain aspect ratio
 		var end_y := temp_rect.end.y
@@ -389,7 +399,7 @@ func resize_selection() -> void:
 
 
 func _gizmo_rotate() -> void:  # Does not work properly yet
-	var angle := canvas.current_pixel.angle_to_point(mouse_pos_on_gizmo_drag)
+	var angle := image_current_pixel.angle_to_point(mouse_pos_on_gizmo_drag)
 	angle = deg2rad(floor(rad2deg(angle)))
 	if angle == prev_angle:
 		return