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mightyscape-1.1-deprecated/extensions/fablabchemnitz/scaletosize.py

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2020-08-04 16:39:16 +02:00
#!/usr/bin/env python3
# Author: Mario Voigt / FabLab Chemnitz
# Mail: mario.voigt@stadtfabrikanten.org
# Date: 04.08.2020
# License: GNU GPL v3
import inkex
from inkex.paths import CubicSuperPath, Path
from inkex import Transform
from lxml import etree
from inkex.styles import Style
# This extension can scale any object or path on X, Y or both axes. This addon is kind of obsolete because you can do the same from transforms menu
class ScaleToSize(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument('--unit')
pars.add_argument("--expected_size", type=float, default=1.0, help="The expected size of the object")
pars.add_argument("--scale_type", default="Horizontal", help="Scale type (Uniform, Horizontal, Vertical)")
pars.add_argument("--description")
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def effect(self):
unit_factor = 1.0 / self.svg.uutounit(1.0,self.options.unit)
for id, node in self.svg.selected.items():
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#get recent XY coordinates (top left corner of the bounding box)
bbox = node.bounding_box()
new_horiz_scale = self.options.expected_size * unit_factor / bbox.width
new_vert_scale = self.options.expected_size * unit_factor / bbox.height
if self.options.scale_type == "Horizontal":
translation_matrix = [[new_horiz_scale, 0.0, 0.0], [0.0, 1.0, 0.0]]
elif self.options.scale_type == "Vertical":
translation_matrix = [[1.0, 0.0, 0.0], [0.0, new_vert_scale, 0.0]]
else: #Uniform
translation_matrix = [[new_horiz_scale, 0.0, 0.0], [0.0, new_vert_scale, 0.0]]
node.transform = Transform(translation_matrix) * node.transform
# now that the node moved we need to get the nodes XY coordinates again to fix them
bbox_new = node.bounding_box()
#inkex.utils.debug(cx)
#inkex.utils.debug(cy)
#inkex.utils.debug(cx_new)
#inkex.utils.debug(cy_new)
# We remove the transformation attribute from SVG XML tree in case it's regular path. In case the node is an object like arc,circle, ellipse or star we have the attribute "sodipodi:type". Then we do not play with it's path because the size transformation will not apply (this code block is ugly)
if node.get ('sodipodi:type') is None and 'd' in node.attrib:
#inkex.utils.debug("it's a path!")
d = node.get('d')
p = CubicSuperPath(d)
transf = Transform(node.get("transform", None))
if 'transform' in node.attrib:
del node.attrib['transform']
p = Path(p).to_absolute().transform(transf, True)
node.set('d', Path(CubicSuperPath(p).to_path()))
#else:
#inkex.utils.debug("it's an object!")
#we perform second translation to reset the center of the path
translation_matrix = [[1.0, 0.0, bbox.left - bbox_new.left + (bbox.width - bbox_new.width)/2], [0.0, 1.0, bbox.top - bbox_new.top + (bbox.height - bbox_new.height)/2]]
node.transform = Transform(translation_matrix) * node.transform
if __name__ == '__main__':
ScaleToSize().run()