118 lines
4.1 KiB
Python
118 lines
4.1 KiB
Python
import os
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import xml.etree.ElementTree as ET
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import subprocess
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from django.conf import settings
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from django.db.models import Max, Min
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from shapely.affinity import scale
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from c3nav.mapdata.models import Package
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class LevelRenderer():
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def __init__(self, level):
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self.level = level
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@staticmethod
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def get_dimensions():
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aggregate = Package.objects.all().aggregate(Max('right'), Min('left'), Max('top'), Min('bottom'))
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return (
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float(aggregate['right__max'] - aggregate['left__min']) * settings.RENDER_SCALE,
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float(aggregate['top__max'] - aggregate['bottom__min']) * settings.RENDER_SCALE
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)
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@staticmethod
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def polygon_svg(geometry, fill_color=None, fill_opacity=None, stroke_width=0.0, stroke_color=None, filter=None):
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scaled = scale(geometry, xfact=settings.render_scale, yfact=settings.render_scale, origin=(0, 0))
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element = ET.fromstring(scaled.svg(0, fill_color or '#FFFFFF'))
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if element.tag != 'g':
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new_element = ET.Element('g')
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new_element.append(element)
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element = new_element
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for path in element.findall('path'):
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path.attrib.pop('opacity')
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path.set('stroke-width', str(stroke_width * settings.RENDER_SCALE))
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if fill_color is None and 'fill' in path.attrib:
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path.attrib.pop('fill')
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path.set('fill-opacity', '0')
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if fill_opacity is not None:
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path.set('fill-opacity', str(fill_opacity))
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if stroke_color is not None:
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path.set('stroke', stroke_color)
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elif 'stroke' in path.attrib:
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path.attrib.pop('stroke')
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if filter is not None:
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path.set('filter', filter)
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return element
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def get_svg(self):
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width, height = self.get_dimensions()
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svg = ET.Element('svg', {
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'width': str(width),
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'height': str(height),
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'xmlns:svg': 'http://www.w3.org/2000/svg',
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'xmlns': 'http://www.w3.org/2000/svg',
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})
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contents = ET.Element('g', {
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'transform': 'scale(1 -1) translate(0 -%d)' % (height),
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})
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svg.append(contents)
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contents.append(self.polygon_svg(self.level.geometries.buildings_with_holes,
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fill_color='#D5D5D5'))
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contents.append(self.polygon_svg(self.level.geometries.outsides,
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fill_color='#DCE6DC'))
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contents.append(self.polygon_svg(self.level.geometries.walls_shadow,
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fill_color='#000000',
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fill_opacity=0.06))
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contents.append(self.polygon_svg(self.level.geometries.elevatorlevels,
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fill_color='#9EF8FB'))
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contents.append(self.polygon_svg(self.level.geometries.doors,
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fill_color='#FFFFFF',
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stroke_color='#3c3c3c',
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stroke_width=0.05))
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contents.append(self.polygon_svg(self.level.geometries.obstacles,
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fill_color='#BDBDBD',
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stroke_color='#9E9E9E',
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stroke_width=0.05))
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contents.append(self.polygon_svg(self.level.geometries.walls,
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fill_color='#949494',
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stroke_color='#3c3c3c',
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stroke_width=0.05))
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return ET.tostring(svg).decode()
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def _get_render_path(self, filename):
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return os.path.join(settings.RENDER_ROOT, filename)
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def write_svg(self):
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filename = self._get_render_path('level-%s.svg' % self.level.name)
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with open(filename, 'w') as f:
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f.write(self.get_svg())
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return filename
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def render_png(self):
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svg_filename = self.write_svg()
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filename = self._get_render_path('level-%s.png' % self.level.name)
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subprocess.call(['rsvg-convert', svg_filename, '-o', filename])
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