FreeCAD macro to normalize imported faces (tested with svg paths).

normalize_face.FCMacro

# Copyright (c) 2023 Gonçalo Baltazar <me@goncalomb.com>
# MIT License

# this macro can be used to manipulate face geometry (scale and origin vertex)
# it was specially made to rescale imported faces (e.g. svg)

# imported geometry may have undesired scale and position, depending on the
# original file (positions, translations, dpi etc.)

# after importing, select a single face vertex and run the macro
# it transforms the geometry of the face to set that vertex as the origin and
# scales it to match the requested size along the selected axis

# TODO: make dialog to configure the behavior

CREATE_COPY = False
SCALE_FINAL_SIZE = 100 # mm
SCALE_AXIS = "X"

ex = Gui.Selection.getSelectionEx()
if ex and ex[0].SubObjects and isinstance(ex[0].SubObjects[0], Part.Vertex):
	object = ex[0].Object
	vertex = ex[0].SubObjects[0]

	label = object.Label
	if CREATE_COPY:
		object = App.ActiveDocument.copyObject(object, True)
	object.Label = "%s_%smm%s" % (label, str(SCALE_FINAL_SIZE), SCALE_AXIS)

	m = App.Matrix()
	m.move(object.Placement.Base-vertex.Point)
	m.scale(SCALE_FINAL_SIZE / getattr(object.Shape.BoundBox, SCALE_AXIS + "Length"))

	object.Placement.Base = App.Vector()
	object.Shape = object.Shape.transformGeometry(m)
else:
	print("no valid selection")