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only draw visible shadows

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Laura Klünder 2017-10-19 12:08:18 +02:00
parent 0e10eeabb8
commit 4876d8502b
1 changed files with 22 additions and 15 deletions
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37
src/c3nav/mapdata/utils/svg.py
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@ -152,27 +152,38 @@ class SVGImage:
self.defs.append(element) self.defs.append(element)
return defid return defid
def get_shadow(self, geometry, elevation): def add_shadow(self, geometry, elevation, clip_path=None):
elevation = min(elevation, 2) elevation = min(elevation, 2)
blur_radius = elevation / 3 * 0.25
shadow_geom = translate(geometry.buffer(blur_radius),
xoff=(elevation / 3 * 0.12), yoff=-(elevation / 3 * 0.12))
if clip_path is not None:
if shadow_geom.distance(clip_path) >= blur_radius:
return
blur_id = 'blur'+str(int(elevation*100)) blur_id = 'blur'+str(int(elevation*100))
if elevation not in self.blurs: if elevation not in self.blurs:
blur_filter = ET.Element('filter', {'id': blur_id, blur_filter = ET.Element('filter', {'id': blur_id,
'width': '200%', 'width': '100%',
'height': '200%', 'height': '100%',
'x': '-50%', 'x': '0%',
'y': '-50%'}) 'y': '0%'})
blur_filter.append(ET.Element('feGaussianBlur', blur_filter.append(ET.Element('feGaussianBlur',
{'stdDeviation': str(elevation / 3 * 0.25 * self.scale)})) {'stdDeviation': str(blur_radius * self.scale)}))
self.defs.append(blur_filter) self.defs.append(blur_filter)
self.blurs.add(elevation) self.blurs.add(elevation)
shadow = self._create_geometry(translate(geometry.buffer(elevation / 3 * 0.25), shadow = self._create_geometry(shadow_geom)
xoff=(elevation / 3 * 0.12), yoff=-(elevation / 3 * 0.12)))
shadow.set('filter', 'url(#'+blur_id+')') shadow.set('filter', 'url(#'+blur_id+')')
shadow.set('fill', 'black') shadow.set('fill', 'black')
shadow.set('fill-opacity', '0.20') shadow.set('fill-opacity', '0.20')
return shadow if clip_path:
shadow_clip = self.register_geometry(clip_path, as_clip_path=True)
shadow.set('clip-path', 'url(#'+shadow_clip+')')
self.g.append(shadow)
def add_clip_path(self, *geometries, inverted=False, subtract=False, defid=None): def add_clip_path(self, *geometries, inverted=False, subtract=False, defid=None):
if defid is None: if defid is None:
@ -209,14 +220,10 @@ class SVGImage:
if elevation is not None: if elevation is not None:
elevation = float(1 if elevation is None else elevation) elevation = float(1 if elevation is None else elevation)
if elevation: if elevation:
shadow = self.get_shadow(geometry, elevation) self.add_shadow(geometry, elevation)
self.g.append(shadow)
else: else:
for other_altitude, other_geom in self.altitudes.items(): for other_altitude, other_geom in self.altitudes.items():
shadow_clip = self.register_geometry(other_geom, as_clip_path=True) self.add_shadow(geometry, altitude-other_altitude, clip_path=other_geom)
shadow = self.get_shadow(geometry, altitude-other_altitude)
shadow.set('clip-path', 'url(#'+shadow_clip+')')
self.g.append(shadow)
self.clip_altitudes(geometry, altitude) self.clip_altitudes(geometry, altitude)