Refactoring: move processing steps to separate functions
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parent
67caf16b14
commit
60f59379e5
322
qsomap.py
322
qsomap.py
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@ -137,16 +137,7 @@ def svg_make_inverse_country_path(doc, map_radius, polygon, **kwargs):
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return doc.path(commands, **kwargs)
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def render(ref_lat, ref_lon, output_stream):
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random.seed(0)
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print("Loading Geodata…", file=sys.stderr)
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with open('geo-countries/data/countries.geojson', 'r') as jfile:
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geojson = json.load(jfile)
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print("Finding boundaries…", file=sys.stderr)
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def simplify_geojson(geojson):
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# key: 3-letter country identifier
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# data: {full_name,
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# numpy.array(coordinates),
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@ -187,15 +178,178 @@ def render(ref_lat, ref_lon, output_stream):
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simplegeodata[key] = {"name": name, "coordinates": conv_polys}
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ref_lat = ref_lat * np.pi / 180
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ref_lon = ref_lon * np.pi / 180
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return simplegeodata
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def map_all_polygons(simplegeodata, ref_lat, ref_lon, map_radius):
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# apply azimuthal equidistant projection
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for k, v in simplegeodata.items():
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proj_polys = []
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for poly in v['coordinates']:
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lat = poly[1, :]
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lon = poly[0, :]
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon,
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map_radius)
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coords = np.array([x, y])
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# remove any points that contain a NaN coordinate
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coords = coords[:, np.any(np.invert(np.isnan(coords)), axis=0)]
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proj_polys.append(coords)
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v['proj_coordinates'] = proj_polys
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def svg_add_countries(doc, simplegeodata, ref_lat, ref_lon, map_radius):
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antipodal_lat = -ref_lat
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antipodal_lon = ref_lon + np.pi
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if antipodal_lon > np.pi:
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antipodal_lon -= 2*np.pi
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for k, v in simplegeodata.items():
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print(f"Exporting {k}…", file=sys.stderr)
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color = random_country_color()
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group = doc.g()
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for i in range(len(v['proj_coordinates'])):
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poly = v['proj_coordinates'][i]
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points = poly.T + map_radius # shift to the center of the drawing
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# check if the antipodal point is inside this polygon. If so, it
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# needs to be "inverted", i.e. subtracted from the surrounding map
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# circle.
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if is_point_in_polygon((antipodal_lon, antipodal_lat),
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v['coordinates'][i].T):
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print("!!! Found polygon containing the antipodal point!",
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file=sys.stderr)
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obj = svg_make_inverse_country_path(doc, map_radius,
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np.flipud(points),
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**{'class': 'country',
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'fill': color})
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else:
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obj = doc.polygon(points, **{
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'class': 'country',
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'fill': color})
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group.add(obj)
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group.set_desc(title=v['name'])
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doc.add(group)
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def svg_add_maidenhead_grid(doc, ref_lat, ref_lon, map_radius):
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# generate Maidenhead locator grid (first two letters only)
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group = doc.g()
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N = 18 # subdivisions of Earth
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resolution = 4096
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for x in range(0, N):
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lon = x * 2 * np.pi / N
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lat = np.linspace(-np.pi/2, np.pi/2, resolution)
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, map_radius)
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points = np.array([x, y]).T + map_radius
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group.add(doc.polyline(points, **{'class': 'maidenhead_line'}))
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for y in range(0, N):
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lon = np.linspace(-np.pi, np.pi, resolution)
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lat = y * np.pi / N - np.pi/2
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon,
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map_radius)
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points = np.array([x, y]).T + map_radius
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group.add(doc.polyline(points, **{'class': 'maidenhead_line'}))
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for x in range(0, N):
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for y in range(0, N):
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sectorname = chr(ord('A') + (x + N//2) % N) \
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+ chr(ord('A') + y)
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lon = (x + 0.5) * 2 * np.pi / N
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lat = (y + 0.5) * np.pi / N - np.pi/2
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tx, ty = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon,
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map_radius)
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font_size = 10
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if y == 0 or y == N-1:
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font_size = 3
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group.add(doc.text(sectorname, (tx + map_radius, ty + map_radius),
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**{'class': 'maidenhead_label',
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'font-size': font_size}))
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doc.add(group) # Maidenhead grid
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def svg_add_distance_azimuth_lines(doc, ref_lat, ref_lon, map_radius):
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group = doc.g()
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# generate equidistant circles
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d_max = 40075/2
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for distance in [500, 1000, 2000, 3000, 4000, 5000, 6000, 8000, 10000,
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12000, 14000, 16000, 18000, 20000]:
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r = map_radius * distance / d_max
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group.add(doc.circle(center=(map_radius, map_radius), r=r,
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**{'class': 'dist_circle'}))
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group.add(doc.text(f"{distance} km", (map_radius, map_radius-r+5),
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**{'class': 'dist_circle_label'}))
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# generate azimuth lines in 30° steps
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for azimuth in np.arange(0, np.pi, np.pi/6):
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start_x = map_radius + map_radius * np.cos(azimuth-np.pi/2)
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start_y = map_radius + map_radius * np.sin(azimuth-np.pi/2)
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end_x = map_radius - map_radius * np.cos(azimuth-np.pi/2)
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end_y = map_radius - map_radius * np.sin(azimuth-np.pi/2)
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group.add(doc.line((start_x, start_y), (end_x, end_y),
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**{'class': 'azimuth_line'}))
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azimuth_deg = int(np.round(azimuth * 180 / np.pi))
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textpos = (2*map_radius - 10, map_radius - 2)
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txt = doc.text(f"{azimuth_deg:d} °", textpos,
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**{'class': 'azimuth_line_label'})
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txt.rotate(azimuth_deg - 90, center=(map_radius, map_radius))
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group.add(txt)
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txt = doc.text(f"{azimuth_deg+180:d} °", textpos,
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**{'class': 'azimuth_line_label'})
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txt.rotate(azimuth_deg - 90 + 180, center=(map_radius, map_radius))
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group.add(txt)
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doc.add(group) # Circles, azimuth lines and labels
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def render(ref_lat, ref_lon, output_stream):
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random.seed(0)
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print("Loading Geodata…", file=sys.stderr)
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with open('geo-countries/data/countries.geojson', 'r') as jfile:
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geojson = json.load(jfile)
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print("Finding boundaries…", file=sys.stderr)
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simplegeodata = simplify_geojson(geojson)
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ref_lat = ref_lat * np.pi / 180
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ref_lon = ref_lon * np.pi / 180
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R = 500
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"""
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@ -233,24 +387,7 @@ def render(ref_lat, ref_lon, output_stream):
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simplegeodata = {"XY": {'name': 'test', 'coordinates': coords}}
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"""
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# apply azimuthal equidistant projection
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for k, v in simplegeodata.items():
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proj_polys = []
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for poly in v['coordinates']:
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lat = poly[1, :]
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lon = poly[0, :]
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R)
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coords = np.array([x, y])
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# remove any points that contain a NaN coordinate
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coords = coords[:, np.any(np.invert(np.isnan(coords)), axis=0)]
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proj_polys.append(coords)
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v['proj_coordinates'] = proj_polys
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map_all_polygons(simplegeodata, ref_lat, ref_lon, R)
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# generate the SVG
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@ -294,128 +431,9 @@ def render(ref_lat, ref_lon, output_stream):
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doc.add(doc.circle(center=(R, R), r=R, fill='#ddeeff',
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stroke_width=1, stroke='black'))
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for k, v in simplegeodata.items():
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print(f"Exporting {k}…", file=sys.stderr)
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color = random_country_color()
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group = doc.g()
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for i in range(len(v['proj_coordinates'])):
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poly = v['proj_coordinates'][i]
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points = poly.T + R # shift to the center of the drawing
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# check if the antipodal point is inside this polygon. If so, it
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# needs to be "inverted", i.e. subtracted from the surrounding map
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# circle.
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if is_point_in_polygon((antipodal_lon, antipodal_lat),
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v['coordinates'][i].T):
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print("!!! Found polygon containing the antipodal point!",
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file=sys.stderr)
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obj = svg_make_inverse_country_path(doc, R, np.flipud(points),
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**{'class': 'country',
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'fill': color})
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else:
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obj = doc.polygon(points, **{
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'class': 'country',
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'fill': color})
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group.add(obj)
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group.set_desc(title=v['name'])
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doc.add(group)
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# generate Maidenhead locator grid (first two letters only)
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group = doc.g()
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N = 18 # subdivisions of Earth
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resolution = 4096
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for x in range(0, N):
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lon = x * 2 * np.pi / N
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lat = np.linspace(-np.pi/2, np.pi/2, resolution)
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R)
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points = np.array([x, y]).T + R
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group.add(doc.polyline(points, **{'class': 'maidenhead_line'}))
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for y in range(0, N):
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lon = np.linspace(-np.pi, np.pi, resolution)
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lat = y * np.pi / N - np.pi/2
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x, y = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R)
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points = np.array([x, y]).T + R
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group.add(doc.polyline(points, **{'class': 'maidenhead_line'}))
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for x in range(0, N):
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for y in range(0, N):
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sectorname = chr(ord('A') + (x + N//2) % N) \
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+ chr(ord('A') + y)
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lon = (x + 0.5) * 2 * np.pi / N
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lat = (y + 0.5) * np.pi / N - np.pi/2
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tx, ty = map_azimuthal_equidistant(lat, lon, ref_lat, ref_lon, R)
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font_size = 10
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if y == 0 or y == N-1:
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font_size = 3
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group.add(doc.text(sectorname, (tx + R, ty + R),
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**{'class': 'maidenhead_label',
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'font-size': font_size}))
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doc.add(group) # Maidenhead grid
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group = doc.g()
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# generate equidistant circles
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d_max = 40075/2
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for distance in [500, 1000, 2000, 3000, 4000, 5000, 6000, 8000, 10000,
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12000, 14000, 16000, 18000, 20000]:
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r = R * distance / d_max
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group.add(doc.circle(center=(R, R), r=r,
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**{'class': 'dist_circle'}))
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group.add(doc.text(f"{distance} km", (R, R-r+5),
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**{'class': 'dist_circle_label'}))
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# generate azimuth lines in 30° steps
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for azimuth in np.arange(0, np.pi, np.pi/6):
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start_x = R + R * np.cos(azimuth-np.pi/2)
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start_y = R + R * np.sin(azimuth-np.pi/2)
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end_x = R - R * np.cos(azimuth-np.pi/2)
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end_y = R - R * np.sin(azimuth-np.pi/2)
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group.add(doc.line((start_x, start_y), (end_x, end_y),
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**{'class': 'azimuth_line'}))
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azimuth_deg = int(np.round(azimuth * 180 / np.pi))
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textpos = (2*R - 10, R - 2)
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txt = doc.text(f"{azimuth_deg:d} °", textpos,
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**{'class': 'azimuth_line_label'})
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txt.rotate(azimuth_deg - 90, center=(R, R))
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group.add(txt)
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txt = doc.text(f"{azimuth_deg+180:d} °", textpos,
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**{'class': 'azimuth_line_label'})
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txt.rotate(azimuth_deg - 90 + 180, center=(R, R))
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group.add(txt)
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doc.add(group) # Circles, azimuth lines and labels
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"""
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for x in range(0, 26):
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for y in range(0, 26):
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sectorname = chr(ord('A')+x) + chr(ord('A')+y)
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"""
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svg_add_countries(doc, simplegeodata, ref_lat, ref_lon, R)
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svg_add_maidenhead_grid(doc, ref_lat, ref_lon, R)
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svg_add_distance_azimuth_lines(doc, ref_lat, ref_lon, R)
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print("Writing output…", file=sys.stderr)
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doc.write(output_stream, pretty=True)
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