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don't eat up walls when buffering altitudeareas

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Laura Klünder 2018-12-06 17:03:24 +01:00
parent a6888ba618
commit 5818caa665
1 changed files with 16 additions and 5 deletions
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21
src/c3nav/mapdata/render/engines/openscad.py
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@ -4,7 +4,7 @@ from collections import UserList
from operator import attrgetter
from shapely import prepared
from shapely.geometry import JOIN_STYLE
from shapely.geometry import JOIN_STYLE, MultiPolygon
from shapely.ops import unary_union
from c3nav.mapdata.render.engines import register_engine
@ -66,6 +66,7 @@ class OpenSCADEngine(Base3DEngine):
levels = get_full_levels(level_render_data)
buildings = None
areas = None
main_building_block = None
main_building_block_diff = None
@ -118,6 +119,7 @@ class OpenSCADEngine(Base3DEngine):
if geoms.on_top_of_id is None:
buildings = geoms.buildings
areas = MultiPolygon()
current_upper_bound = geoms.upper_bound
holes = geoms.holes.difference(restricted_spaces)
@ -137,11 +139,20 @@ class OpenSCADEngine(Base3DEngine):
else:
name = 'Altitudearea %s' % (altitudearea.altitude / 1000)
# why all this buffering?
# buffer(0) ensures a valid geometry, this is sadly needed sometimes
# the rest of the buffering is meant to make polygons overlap a little so no glitches appear
# the intersections below will ensure that they they only overlap with each other and don't eat walls
geometry = altitudearea.geometry.buffer(0)
inside_geometry = geometry.intersection(buildings).buffer(0).buffer(0.01, join_style=JOIN_STYLE.mitre)
outside_geometry = geometry.difference(buildings).buffer(0).buffer(0.01, join_style=JOIN_STYLE.mitre)
geometry_buffered = geometry.buffer(0.01, join_style=JOIN_STYLE.mitre)
if geoms.on_top_of_id is None:
areas = areas.union(geometry)
buildings = buildings.difference(geometry).buffer(0)
inside_geometry = inside_geometry.intersection(areas).buffer(0)
outside_geometry = outside_geometry.intersection(areas).buffer(0)
geometry_buffered = geometry_buffered.intersection(areas).buffer(0)
slopes = True
@ -235,8 +246,8 @@ class OpenSCADEngine(Base3DEngine):
height_diff.append(height_union)
for obstacle in obstacles:
obstacle = obstacle.geom.buffer(0).intersection(geometry)
obstacle = obstacle.buffer(0.01, join_style=JOIN_STYLE.mitre)
obstacle = obstacle.geom.buffer(0).buffer(0.01, join_style=JOIN_STYLE.mitre)
obstacle = obstacle.intersection(geometry_buffered)
if not obstacle.is_empty:
had_height_obstacles = True
had_obstacles = True
@ -263,8 +274,8 @@ class OpenSCADEngine(Base3DEngine):
had_obstacles = False
for height, obstacles in altitudearea.obstacles.items():
for obstacle in obstacles:
obstacle = obstacle.geom.buffer(0).intersection(geometry)
obstacle = obstacle.buffer(0.01, join_style=JOIN_STYLE.mitre)
obstacle = obstacle.geom.buffer(0).buffer(0.01, join_style=JOIN_STYLE.mitre)
obstacle = obstacle.intersection(geometry_buffered)
if not obstacle.is_empty:
had_obstacles = True
obstacles_block.append(