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replace transformations with matrix transformation (33% performance boost!)

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Laura Klünder 2017-10-19 19:40:17 +02:00
parent fc03d18e12
commit d2c53e0c3d
1 changed files with 9 additions and 4 deletions
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13
src/c3nav/mapdata/utils/svg.py
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@ -8,7 +8,7 @@ from itertools import chain
from django.conf import settings
from django.core.checks import Error, register
from PIL import Image
from shapely.affinity import scale, translate
from shapely.affinity import affine_transform, translate
from shapely.ops import unary_union
# import gobject-inspect, cairo and rsvg if the native rsvg SVG_RENDERER should be used
@ -143,9 +143,14 @@ class SVGImage:
def _create_geometry(self, geometry):
# convert a shapely geometry into an svg xml element
geometry = translate(geometry, xoff=0-self.left, yoff=0-self.bottom)
geometry = scale(geometry, xfact=1, yfact=-1, origin=(self.width / 2, self.height / 2))
geometry = scale(geometry, xfact=self.scale, yfact=self.scale, origin=(0, 0))
# scale and move the object into position, this is equivalent to:
# geometry = translate(geometry, xoff=0-self.left, yoff=0-self.bottom)
# geometry = scale(geometry, xfact=1, yfact=-1, origin=(self.width / 2, self.height / 2))
# geometry = scale(geometry, xfact=self.scale, yfact=self.scale, origin=(0, 0))
geometry = affine_transform(geometry, (self.scale, 0.0,
0.0, -self.scale,
-(self.left)*self.scale, (self.top)*self.scale))
element = ET.fromstring(self._trim_decimals(geometry.svg(0, '#FFFFFF')))
if element.tag != 'g':
new_element = ET.Element('g')