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move clip_altitudes() to base RenderEngine

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Laura Klünder 2017-11-06 10:02:34 +01:00
parent 400f2892bb
commit 80fb9e2df7
2 changed files with 18 additions and 23 deletions
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24
src/c3nav/mapdata/render/engines/svg.py
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@ -6,12 +6,11 @@ from itertools import chain
from typing import Optional
import numpy as np
from PIL import Image
from django.conf import settings
from django.core import checks
from PIL import Image
from shapely.affinity import translate
from shapely.geometry import LineString, Polygon
from shapely.ops import unary_union
# import gobject-inspect, cairo and rsvg if the native rsvg SVG_RENDERER should be used
from c3nav.mapdata.render.engines.base import FillAttribs, RenderEngine, StrokeAttribs
@ -47,10 +46,6 @@ class SVGEngine(RenderEngine):
self.defs = ''
self.clip_path_i = 0
# keep track which area of the image has which altitude currently
self.altitudes = {}
self.last_altitude = None
# for fast numpy operations
self.np_scale = np.array((self.scale, -self.scale))
self.np_offset = np.array((-self.minx * self.scale, self.maxy * self.scale))
@ -201,23 +196,6 @@ class SVGEngine(RenderEngine):
shadow = self._create_geometry(shadow_geom, attribs)
self.g += shadow
def clip_altitudes(self, new_geometry, new_altitude=None):
# register new geometry with specific (or no) altitude
# a geometry with no altitude will reset the altitude information of its area as if nothing was ever there
for altitude, geometry in tuple(self.altitudes.items()):
if altitude != new_altitude:
self.altitudes[altitude] = geometry.difference(new_geometry)
if self.altitudes[altitude].is_empty:
self.altitudes.pop(altitude)
if new_altitude is not None:
if self.last_altitude is not None and self.last_altitude > new_altitude:
raise ValueError('Altitudes have to be ascending.')
self.last_altitude = new_altitude
if new_altitude in self.altitudes:
self.altitudes[new_altitude] = unary_union([self.altitudes[new_altitude], new_geometry])
else:
self.altitudes[new_altitude] = new_geometry
def _add_geometry(self, geometry, fill: Optional[FillAttribs] = None, stroke: Optional[StrokeAttribs] = None,
altitude=None, height=None, shape_cache_key=None):