using mapnik
This commit is contained in:
parent
d3692ff587
commit
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GPG key ID:
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1 changed files with 308 additions and 164 deletions
472
mapbender.py
472
mapbender.py
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@ -26,6 +26,8 @@ import urllib.request
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import matplotlib.path
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import matplotlib.path
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import matplotlib.transforms
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import matplotlib.transforms
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import xml.etree.ElementTree as ET
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import xml.etree.ElementTree as ET
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import mapnik
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import cairo
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TILESIZE = 256
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TILESIZE = 256
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EARTHRADIUS = 6378137
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EARTHRADIUS = 6378137
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@ -45,17 +47,12 @@ def haversine(lon1, lat1, lon2, lat2):
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return EARTHRADIUS * 2 * math.asin(math.sqrt(a))
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return EARTHRADIUS * 2 * math.asin(math.sqrt(a))
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def lat2y(a, zoom):
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def lat2y(lat, zoom):
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return (
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return math.log(math.tan(math.pi / 4 + math.radians(lat) / 2)) * EARTHRADIUS
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(1.0 - math.asinh(math.tan(math.radians(a))) / math.pi)
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/ 2.0
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* 2 ** zoom
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* TILESIZE
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)
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def lon2x(a, zoom):
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def lon2x(lon, zoom):
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return (a + 180.0) / 360.0 * (2 ** zoom * TILESIZE)
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return math.radians(lon) * EARTHRADIUS
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def pairwise(iterable):
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def pairwise(iterable):
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@ -106,10 +103,88 @@ def intersects(p0, p1, p2, p3):
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return True
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return True
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def main(path, width, subdiv, zoom):
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def main():
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import sys
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if len(sys.argv) != 4:
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print("usage: %s data.gpx mapwidth paperwidth" % sys.argv[0])
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exit(1)
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zoom = 10
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latmin = math.inf
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latmax = -1
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path = []
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with open(sys.argv[1]) as f:
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root = ET.parse(f)
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for trkpt in root.findall(
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"./gpx:trk/gpx:trkseg/gpx:trkpt",
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{"gpx": "http://www.topografix.com/GPX/1/1"},
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):
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lat = float(trkpt.attrib["lat"])
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lon = float(trkpt.attrib["lon"])
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if lat < latmin:
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latmin = lat
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if lat > latmax:
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latmax = lat
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# apply mercator projection
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path.append((lon, lat))
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merc = mapnik.Projection('+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over')
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longlat = mapnik.Projection('+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs')
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#m = mapnik.Map(800, 600)
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#mapnik.load_map_from_string(m, open("/tmp/openstreetmap-carto/mapnik.xml").read(), False, "/tmp/openstreetmap-carto/")
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#gpxstyle = mapnik.Style()
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#gpxrule = mapnik.Rule()
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#gpxsym = mapnik.LineSymbolizer()
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#gpxsym.stroke = mapnik.Color('red')
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#gpxsym.stroke_width = 5
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#gpxsym.stroke_opacity = 0.5
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#gpxrule.symbols.append(gpxsym)
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#gpxstyle.rules.append(gpxrule)
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#m.append_style('GPXStyle', gpxstyle)
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#gpxlayer = mapnik.Layer('GPXLayer')
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##gpxlayer.srs =
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#gpxlayer.datasource = mapnik.Ogr(file = sys.argv[1], layer = 'tracks')
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#gpxlayer.styles.append('GPXStyle')
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#m.layers.append(gpxlayer)
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#m.aspect_fix_mode = mapnik.aspect_fix_mode.GROW_BBOX
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#m.srs = merc.params()
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#m.zoom_to_box(mapnik.ProjTransform(longlat, merc).forward(gpxlayer.envelope()))
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#mapnik.render_to_file(m, "out.png", "png", 1.0)
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length = 0
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for (lon1, lat1), (lon2, lat2) in pairwise(path):
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length += haversine(lon1, lat1, lon2, lat2)
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dpi = 96 # because we use bitmap tiles instead of vectors
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mapwidthm = float(sys.argv[2]) # map width in m
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paperwidthm = float(sys.argv[3]) # paper width in m
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earth = 6378137 # earth equator radius in m
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width = dpi / 0.0254 * paperwidthm # width in px
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zoom = math.ceil(
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math.log2(
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2
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* math.pi
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* earth
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* math.cos(math.radians((latmax + latmin) / 2))
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* width
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/ (mapwidthm * TILESIZE)
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)
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)
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subdiv = math.ceil(4*length/mapwidthm)
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subdiv = 40
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width = 15000
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print("zoom:", zoom)
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print("length:", length)
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print("subdiv:", subdiv)
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path = [(lon2x(lon, zoom), lat2y(lat, zoom)) for lon, lat in path]
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halfwidth = width / 2.0
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halfwidth = width / 2.0
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found_smoothing = False
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found_smoothing = False
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for smoothing in [2 ** i for i in range(30)]:
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#for smoothing in [2 ** i for i in range(30)]:
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for smoothing in [2 ** 35]:
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tck, u = interpolate.splprep(list(zip(*path)), s=smoothing)
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tck, u = interpolate.splprep(list(zip(*path)), s=smoothing)
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unew = numpy.linspace(0, 1.0, subdiv + 1)
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unew = numpy.linspace(0, 1.0, subdiv + 1)
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out = interpolate.splev(unew, tck)
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out = interpolate.splev(unew, tck)
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@ -185,6 +260,7 @@ def main(path, width, subdiv, zoom):
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have_convex = True
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have_convex = True
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break
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break
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if have_convex:
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if have_convex:
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print("have convex")
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continue
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continue
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## check for quads that look too much like a triangle
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## check for quads that look too much like a triangle
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# have_triangle = False
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# have_triangle = False
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@ -215,6 +291,7 @@ def main(path, width, subdiv, zoom):
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):
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):
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found_smoothing = True
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found_smoothing = True
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break
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break
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print("doesn't contain path")
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if not found_smoothing:
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if not found_smoothing:
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print("cannot find smoothing")
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print("cannot find smoothing")
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exit(1)
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exit(1)
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@ -243,162 +320,229 @@ def main(path, width, subdiv, zoom):
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miny = yi
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miny = yi
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if yi > maxy:
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if yi > maxy:
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maxy = yi
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maxy = yi
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im1 = Image.new("RGB", (int(maxx - minx), int(maxy - miny)))
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print(minx, maxx, miny, maxy)
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im2 = Image.new("RGB", (int(maxx - minx), int(maxy - miny)))
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opener = urllib.request.build_opener()
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opener.addheaders = [("User-agent", "mapbender")]
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urllib.request.install_opener(opener)
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todl = []
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for i in range(int(minx / TILESIZE) - 1, int(maxx / TILESIZE) + 2):
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for j in range(int(miny / TILESIZE) - 1, int(maxy / TILESIZE) + 2):
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os.makedirs("%d/%d" % (zoom, i), exist_ok=True)
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fname = "%d/%d/%d.png" % (zoom, i, j)
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if not matplotlib.path.Path(numpy.array(polygon)).intersects_bbox(
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matplotlib.transforms.Bbox(
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[
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(i * TILESIZE, j * TILESIZE),
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(
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(i + 1) * TILESIZE,
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(j + 1) * TILESIZE,
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),
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]
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)
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):
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continue
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if not os.path.exists(fname):
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todl.append((i, j))
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for n, (i, j) in enumerate(todl):
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print("%d/%d" % (n, len(todl)))
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fname = "%d/%d/%d.png" % (zoom, i, j)
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urllib.request.urlretrieve(
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#"https://tile.openstreetmap.org/%d/%d/%d.png" % (zoom, i, j),
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#https://a.tile.thunderforest.com/cycle/17/68690/44518.png?apikey=6170aad10dfd42a38d4d8c709a53
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"https://tile.thunderforest.com/cycle/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
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#"https://tile.thunderforest.com/outdoors/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
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#"https://tile.thunderforest.com/landscape/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
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#"https://tile.thunderforest.com/atlas/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
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filename=fname,
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)
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for i in range(int(minx / TILESIZE) - 1, int(maxx / TILESIZE) + 2):
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for j in range(int(miny / TILESIZE) - 1, int(maxy / TILESIZE) + 2):
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if not matplotlib.path.Path(numpy.array(polygon)).intersects_bbox(
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matplotlib.transforms.Bbox(
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[
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(i * TILESIZE, j * TILESIZE),
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(
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(i + 1) * TILESIZE,
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(j + 1) * TILESIZE,
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),
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]
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)
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):
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continue
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fname = "%d/%d/%d.png" % (zoom, i, j)
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with Image.open(fname) as tile:
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im1.paste(tile, (int(i * TILESIZE - minx), int(j * TILESIZE - miny)))
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im2.paste(tile, (int(i * TILESIZE - minx), int(j * TILESIZE - miny)))
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draw2 = ImageDraw.Draw(im2)
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draw2.line([(xi - minx, yi - miny) for xi, yi in path], fill=(255, 0, 0), width=4)
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draw1 = ImageDraw.Draw(im1)
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draw1.line([(xi - minx, yi - miny) for xi, yi in path], fill=(255, 0, 0), width=4)
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draw1.line([(xi - minx, yi - miny) for xi, yi in zip(*out)], fill=(0, 255, 0))
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for ((p00, p01), (p10, p11), (p20, p21), (p30, p31)) in quads:
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draw1.polygon(
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[
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(p00 - minx, p01 - miny),
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(p10 - minx, p11 - miny),
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(p20 - minx, p21 - miny),
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(p30 - minx, p31 - miny),
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]
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)
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draw1.polygon([(xi - minx, yi - miny) for xi, yi in polygon], outline=(0, 0, 255))
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im1.save("out2.png")
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data = []
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m = mapnik.Map(800, 600)
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mapnik.load_map_from_string(m, open("/tmp/openstreetmap-carto/mapnik.xml").read(), False, "/tmp/openstreetmap-carto/")
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gpxstyle = mapnik.Style()
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gpxrule = mapnik.Rule()
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gpxsym = mapnik.LineSymbolizer()
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gpxsym.stroke = mapnik.Color('blue')
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gpxsym.stroke_width = 5
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gpxsym.stroke_opacity = 0.5
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gpxrule.symbols.append(gpxsym)
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gpxstyle.rules.append(gpxrule)
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m.append_style('GPXStyle', gpxstyle)
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gpxlayer = mapnik.Layer('GPXLayer')
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#gpxlayer.srs =
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gpxlayer.datasource = mapnik.Ogr(file = sys.argv[1], layer = 'tracks')
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gpxlayer.styles.append('GPXStyle')
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m.layers.append(gpxlayer)
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m.aspect_fix_mode = mapnik.aspect_fix_mode.GROW_BBOX
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m.zoom_to_box(mapnik.Box2d(mapnik.Coord(minx, miny), mapnik.Coord(maxx, maxy)))
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m.srs = merc.params()
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surface = cairo.SVGSurface("out.svg", 800, 600)
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ctx = cairo.Context(surface)
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mapnik.render(m, ctx)
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for pos in zip(*out):
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pos = m.view_transform().forward(mapnik.Coord(*pos))
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ctx.line_to(pos.x, pos.y)
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ctx.set_source_rgb(0,0,0)
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ctx.stroke()
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for i, (p0, p1, p2, p3) in enumerate(quads):
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p0 = m.view_transform().forward(mapnik.Coord(*p0))
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p1 = m.view_transform().forward(mapnik.Coord(*p1))
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p2 = m.view_transform().forward(mapnik.Coord(*p2))
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p3 = m.view_transform().forward(mapnik.Coord(*p3))
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if i == 1:
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ctx.arc(p0.x, p0.y, 10, 0, 2*math.pi)
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ctx.set_source_rgb(1,0,0)
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ctx.fill()
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ctx.arc(p1.x, p1.y, 10, 0, 2*math.pi)
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ctx.set_source_rgb(0,1,0)
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ctx.fill()
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ctx.arc(p2.x, p2.y, 10, 0, 2*math.pi)
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ctx.set_source_rgb(0,0,1)
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ctx.fill()
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ctx.arc(p3.x, p3.y, 10, 0, 2*math.pi)
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ctx.set_source_rgb(1,1,0)
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ctx.fill()
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ctx.move_to(p0.x, p0.y)
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ctx.line_to(p1.x, p1.y)
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ctx.line_to(p2.x, p2.y)
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ctx.line_to(p3.x, p3.y)
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ctx.close_path()
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ctx.set_source_rgb(1,0,0)
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ctx.stroke()
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surface.finish()
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vertices = []
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triangles = []
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for i, (off, h, (p0, p1, p2, p3)) in enumerate(zip(offs, heights, quads)):
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for i, (off, h, (p0, p1, p2, p3)) in enumerate(zip(offs, heights, quads)):
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data.append(
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v1 = (p0[0], p0[1], width, off+h) # top right
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(
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v2 = (p1[0], p1[1], width, off) # bottom right
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(
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v3 = (p2[0], p2[1], 0, off) # bottom left
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0,
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v4 = (p3[0], p3[1], 0, off+h) # top left
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int(height - offs[i] - heights[i]),
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vertices.extend([v3, v2, v1])
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int(width),
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triangles.append((len(vertices)-3, len(vertices)-2, len(vertices)-1))
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int(height - offs[i]),
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vertices.extend([v3, v1, v4])
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),
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triangles.append((len(vertices)-3, len(vertices)-2, len(vertices)-1))
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(
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p0[0] - minx,
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p0[1] - miny,
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p1[0] - minx,
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p1[1] - miny,
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p2[0] - minx,
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p2[1] - miny,
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p3[0] - minx,
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p3[1] - miny,
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),
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)
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)
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im_out = im2.transform(
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(int(width), int(height)),
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Image.MESH,
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data,
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Image.BICUBIC,
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)
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im_out.save("out.png")
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im_out.save("out.jpg", quality=95)
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return True
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with open("/tmp/tinshift.json", "w") as f:
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print("""
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{
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"file_type": "triangulation_file",
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"format_version": "1.0",
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"transformed_components": [ "horizontal" ],
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"fallback_strategy": "nearest",
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"vertices_columns": [ "source_x", "source_y", "target_x", "target_y" ],
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||||||
|
"triangles_columns": [ "idx_vertex1", "idx_vertex2", "idx_vertex3" ],
|
||||||
|
"vertices": [ %s ],
|
||||||
|
"triangles": [ %s ]
|
||||||
|
}
|
||||||
|
""" % (','.join(["[ %f, %f, %f, %f ]"%v for v in vertices]), ','.join(["[%d, %d, %d]"%t for t in triangles])), file=f)
|
||||||
|
|
||||||
|
tinshift = mapnik.Projection("+proj=pipeline +step +proj=webmerc +step +proj=tinshift +file=/tmp/tinshift.json")
|
||||||
|
m = mapnik.Map(1600, int(1600*height/width))
|
||||||
|
mapnik.load_map_from_string(m, open("/tmp/openstreetmap-carto/mapnik.xml").read(), False, "/tmp/openstreetmap-carto/")
|
||||||
|
gpxstyle = mapnik.Style()
|
||||||
|
gpxrule = mapnik.Rule()
|
||||||
|
gpxsym = mapnik.LineSymbolizer()
|
||||||
|
gpxsym.stroke = mapnik.Color('blue')
|
||||||
|
gpxsym.stroke_width = 5
|
||||||
|
gpxsym.stroke_opacity = 0.5
|
||||||
|
gpxrule.symbols.append(gpxsym)
|
||||||
|
gpxstyle.rules.append(gpxrule)
|
||||||
|
m.append_style('GPXStyle', gpxstyle)
|
||||||
|
gpxlayer = mapnik.Layer('GPXLayer')
|
||||||
|
gpxlayer.datasource = mapnik.Ogr(file = sys.argv[1], layer = 'tracks')
|
||||||
|
gpxlayer.styles.append('GPXStyle')
|
||||||
|
m.layers.append(gpxlayer)
|
||||||
|
m.aspect_fix_mode = mapnik.aspect_fix_mode.GROW_BBOX
|
||||||
|
m.zoom_to_box(mapnik.Box2d(mapnik.Coord(0, 0), mapnik.Coord(width, height)))
|
||||||
|
m.srs = tinshift.params()
|
||||||
|
surface = cairo.PDFSurface("out.pdf", 1600, int(1600*height/width))
|
||||||
|
mapnik.render(m, surface)
|
||||||
|
surface.finish()
|
||||||
|
|
||||||
|
|
||||||
|
#minx = math.inf
|
||||||
|
#maxx = -1
|
||||||
|
#miny = math.inf
|
||||||
|
#maxy = -1
|
||||||
|
#for (xi, yi) in polygon:
|
||||||
|
# if xi < minx:
|
||||||
|
# minx = xi
|
||||||
|
# if xi > maxx:
|
||||||
|
# maxx = xi
|
||||||
|
# if yi < miny:
|
||||||
|
# miny = yi
|
||||||
|
# if yi > maxy:
|
||||||
|
# maxy = yi
|
||||||
|
#im1 = Image.new("RGB", (int(maxx - minx), int(maxy - miny)))
|
||||||
|
#im2 = Image.new("RGB", (int(maxx - minx), int(maxy - miny)))
|
||||||
|
#opener = urllib.request.build_opener()
|
||||||
|
#opener.addheaders = [("User-agent", "mapbender")]
|
||||||
|
#urllib.request.install_opener(opener)
|
||||||
|
#todl = []
|
||||||
|
#for i in range(int(minx / TILESIZE) - 1, int(maxx / TILESIZE) + 2):
|
||||||
|
# for j in range(int(miny / TILESIZE) - 1, int(maxy / TILESIZE) + 2):
|
||||||
|
# os.makedirs("%d/%d" % (zoom, i), exist_ok=True)
|
||||||
|
# fname = "%d/%d/%d.png" % (zoom, i, j)
|
||||||
|
# if not matplotlib.path.Path(numpy.array(polygon)).intersects_bbox(
|
||||||
|
# matplotlib.transforms.Bbox(
|
||||||
|
# [
|
||||||
|
# (i * TILESIZE, j * TILESIZE),
|
||||||
|
# (
|
||||||
|
# (i + 1) * TILESIZE,
|
||||||
|
# (j + 1) * TILESIZE,
|
||||||
|
# ),
|
||||||
|
# ]
|
||||||
|
# )
|
||||||
|
# ):
|
||||||
|
# continue
|
||||||
|
# if not os.path.exists(fname):
|
||||||
|
# todl.append((i, j))
|
||||||
|
#for n, (i, j) in enumerate(todl):
|
||||||
|
# print("%d/%d" % (n, len(todl)))
|
||||||
|
# fname = "%d/%d/%d.png" % (zoom, i, j)
|
||||||
|
# urllib.request.urlretrieve(
|
||||||
|
# #"https://tile.openstreetmap.org/%d/%d/%d.png" % (zoom, i, j),
|
||||||
|
# #https://a.tile.thunderforest.com/cycle/17/68690/44518.png?apikey=6170aad10dfd42a38d4d8c709a53
|
||||||
|
# "https://tile.thunderforest.com/cycle/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
|
||||||
|
# #"https://tile.thunderforest.com/outdoors/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
|
||||||
|
# #"https://tile.thunderforest.com/landscape/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
|
||||||
|
# #"https://tile.thunderforest.com/atlas/%d/%d/%d.png?apikey=d8f470ce7a8e4dd0acf39cc8fd3cf979" % (zoom, i, j),
|
||||||
|
# filename=fname,
|
||||||
|
# )
|
||||||
|
#for i in range(int(minx / TILESIZE) - 1, int(maxx / TILESIZE) + 2):
|
||||||
|
# for j in range(int(miny / TILESIZE) - 1, int(maxy / TILESIZE) + 2):
|
||||||
|
# if not matplotlib.path.Path(numpy.array(polygon)).intersects_bbox(
|
||||||
|
# matplotlib.transforms.Bbox(
|
||||||
|
# [
|
||||||
|
# (i * TILESIZE, j * TILESIZE),
|
||||||
|
# (
|
||||||
|
# (i + 1) * TILESIZE,
|
||||||
|
# (j + 1) * TILESIZE,
|
||||||
|
# ),
|
||||||
|
# ]
|
||||||
|
# )
|
||||||
|
# ):
|
||||||
|
# continue
|
||||||
|
# fname = "%d/%d/%d.png" % (zoom, i, j)
|
||||||
|
# with Image.open(fname) as tile:
|
||||||
|
# im1.paste(tile, (int(i * TILESIZE - minx), int(j * TILESIZE - miny)))
|
||||||
|
# im2.paste(tile, (int(i * TILESIZE - minx), int(j * TILESIZE - miny)))
|
||||||
|
#draw2 = ImageDraw.Draw(im2)
|
||||||
|
#draw2.line([(xi - minx, yi - miny) for xi, yi in path], fill=(255, 0, 0), width=4)
|
||||||
|
#draw1 = ImageDraw.Draw(im1)
|
||||||
|
#draw1.line([(xi - minx, yi - miny) for xi, yi in path], fill=(255, 0, 0), width=4)
|
||||||
|
#draw1.line([(xi - minx, yi - miny) for xi, yi in zip(*out)], fill=(0, 255, 0))
|
||||||
|
#for ((p00, p01), (p10, p11), (p20, p21), (p30, p31)) in quads:
|
||||||
|
# draw1.polygon(
|
||||||
|
# [
|
||||||
|
# (p00 - minx, p01 - miny),
|
||||||
|
# (p10 - minx, p11 - miny),
|
||||||
|
# (p20 - minx, p21 - miny),
|
||||||
|
# (p30 - minx, p31 - miny),
|
||||||
|
# ]
|
||||||
|
# )
|
||||||
|
#draw1.polygon([(xi - minx, yi - miny) for xi, yi in polygon], outline=(0, 0, 255))
|
||||||
|
#im1.save("out2.png")
|
||||||
|
|
||||||
|
#data = []
|
||||||
|
#for i, (off, h, (p0, p1, p2, p3)) in enumerate(zip(offs, heights, quads)):
|
||||||
|
# data.append(
|
||||||
|
# (
|
||||||
|
# (
|
||||||
|
# 0,
|
||||||
|
# int(height - offs[i] - heights[i]),
|
||||||
|
# int(width),
|
||||||
|
# int(height - offs[i]),
|
||||||
|
# ),
|
||||||
|
# (
|
||||||
|
# p0[0] - minx,
|
||||||
|
# p0[1] - miny,
|
||||||
|
# p1[0] - minx,
|
||||||
|
# p1[1] - miny,
|
||||||
|
# p2[0] - minx,
|
||||||
|
# p2[1] - miny,
|
||||||
|
# p3[0] - minx,
|
||||||
|
# p3[1] - miny,
|
||||||
|
# ),
|
||||||
|
# )
|
||||||
|
# )
|
||||||
|
#im_out = im2.transform(
|
||||||
|
# (int(width), int(height)),
|
||||||
|
# Image.MESH,
|
||||||
|
# data,
|
||||||
|
# Image.BICUBIC,
|
||||||
|
#)
|
||||||
|
#im_out.save("out.png")
|
||||||
|
#im_out.save("out.jpg", quality=95)
|
||||||
|
|
||||||
|
#return True
|
||||||
|
|
||||||
|
|
||||||
if __name__ == "__main__":
|
if __name__ == "__main__":
|
||||||
import sys
|
main()
|
||||||
|
|
||||||
if len(sys.argv) != 4:
|
|
||||||
print("usage: %s data.gpx mapwidth paperwidth" % sys.argv[0])
|
|
||||||
exit(1)
|
|
||||||
|
|
||||||
zoom = 10
|
|
||||||
latmin = math.inf
|
|
||||||
latmax = -1
|
|
||||||
|
|
||||||
path = []
|
|
||||||
with open(sys.argv[1]) as f:
|
|
||||||
root = ET.parse(f)
|
|
||||||
for trkpt in root.findall(
|
|
||||||
"./gpx:trk/gpx:trkseg/gpx:trkpt",
|
|
||||||
{"gpx": "http://www.topografix.com/GPX/1/1"},
|
|
||||||
):
|
|
||||||
lat = float(trkpt.attrib["lat"])
|
|
||||||
lon = float(trkpt.attrib["lon"])
|
|
||||||
if lat < latmin:
|
|
||||||
latmin = lat
|
|
||||||
if lat > latmax:
|
|
||||||
latmax = lat
|
|
||||||
# apply mercator projection
|
|
||||||
path.append((lon, lat))
|
|
||||||
|
|
||||||
length = 0
|
|
||||||
for (lon1, lat1), (lon2, lat2) in pairwise(path):
|
|
||||||
length += haversine(lon1, lat1, lon2, lat2)
|
|
||||||
|
|
||||||
dpi = 96 # because we use bitmap tiles instead of vectors
|
|
||||||
mapwidthm = float(sys.argv[2]) # map width in m
|
|
||||||
paperwidthm = float(sys.argv[3]) # paper width in m
|
|
||||||
earth = 6378137 # earth equator radius in m
|
|
||||||
widthpx = dpi / 0.0254 * paperwidthm
|
|
||||||
zoom = math.ceil(
|
|
||||||
math.log2(
|
|
||||||
2
|
|
||||||
* math.pi
|
|
||||||
* earth
|
|
||||||
* math.cos(math.radians((latmax + latmin) / 2))
|
|
||||||
* widthpx
|
|
||||||
/ (mapwidthm * TILESIZE)
|
|
||||||
)
|
|
||||||
)
|
|
||||||
subdiv = math.ceil(4*length/mapwidthm)
|
|
||||||
print("zoom:", zoom)
|
|
||||||
print("length:", length)
|
|
||||||
print("subdiv:", subdiv)
|
|
||||||
|
|
||||||
path = [(lon2x(lon, zoom), lat2y(lat, zoom)) for lon, lat in path]
|
|
||||||
|
|
||||||
main(path, widthpx, subdiv, zoom)
|
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue