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nvrl
fde9c2d271
- The Proton accent preference becomes a whole Proton theme that also holds against a GTK theme imported from gtk.css; folders get Proton's purple folder icon while it is on. - Places map markers show one of each town's photos with a count, and zoomed in on a town every photo sits where it was taken (Request::PlaceLocations). Photos taken on one spot are listed in a popover. "Show on map" in the photo viewer goes to the Places map. - The built-in map draws country borders, sea and land in their own colours. - An opt-in street map from OpenFreeMap (vector tiles drawn with cairo, cached on disk up to 256 MB), with the OpenStreetMap credit on the map and in About. - Translations for all catalogs; changelog folded into 2.3.0.
88 lines
3.2 KiB
Python
Executable File
88 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Regenerate crates/pdfs-gui/data/land.txt from Natural Earth's land polygons,
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and crates/pdfs-gui/data/borders.txt from its country borders.
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Usage:
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curl -LO https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_50m_land.geojson
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scripts/natural-earth-land.py ne_50m_land.geojson crates/pdfs-gui/data/land.txt
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curl -LO https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_50m_admin_0_boundary_lines_land.geojson
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scripts/natural-earth-land.py ne_50m_admin_0_boundary_lines_land.geojson crates/pdfs-gui/data/borders.txt
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Natural Earth is in the public domain; the About dialog credits it anyway.
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The output is one ring per line, as space-separated "longitude,latitude"
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pairs rounded to two decimals (about a kilometre). Each ring is simplified
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with Ramer-Douglas-Peucker to TOLERANCE degrees, which is finer than the map
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can show at its closest zoom, and rings left with fewer than four points
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(islets smaller than the tolerance) are dropped. Holes (lakes) are dropped
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too: the map fills the land and draws nothing on top of it. Borders are lines
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rather than rings, simplified the same way; a line needs two points.
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"""
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import json
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import sys
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TOLERANCE = 0.04
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def point_line_distance(p, a, b):
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(x, y), (x1, y1), (x2, y2) = p, a, b
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dx, dy = x2 - x1, y2 - y1
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if dx == 0 and dy == 0:
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return ((x - x1) ** 2 + (y - y1) ** 2) ** 0.5
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t = max(0, min(1, ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy)))
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return ((x - x1 - t * dx) ** 2 + (y - y1 - t * dy) ** 2) ** 0.5
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def simplify(points):
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"""Ramer-Douglas-Peucker, iterative so long coastlines don't recurse deep."""
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keep = [False] * len(points)
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keep[0] = keep[-1] = True
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stack = [(0, len(points) - 1)]
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while stack:
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first, last = stack.pop()
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worst, index = 0.0, None
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for i in range(first + 1, last):
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d = point_line_distance(points[i], points[first], points[last])
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if d > worst:
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worst, index = d, i
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if index is not None and worst > TOLERANCE:
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keep[index] = True
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stack.append((first, index))
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stack.append((index, last))
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return [p for p, k in zip(points, keep) if k]
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def main(source, target):
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features = json.load(open(source))["features"]
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lines = []
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for feature in features:
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geometry = feature["geometry"]
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kind = geometry["type"]
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if kind in ("LineString", "MultiLineString"):
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paths = (
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geometry["coordinates"]
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if kind == "MultiLineString"
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else [geometry["coordinates"]]
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)
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shortest = 2
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else:
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polygons = (
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geometry["coordinates"]
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if kind == "MultiPolygon"
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else [geometry["coordinates"]]
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)
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paths = [polygon[0] for polygon in polygons]
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shortest = 4
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for path in paths:
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path = simplify(path)
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if len(path) < shortest:
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continue
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lines.append(" ".join(f"{lon:.2f},{lat:.2f}" for lon, lat in path))
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with open(target, "w") as out:
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out.write("\n".join(lines) + "\n")
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if __name__ == "__main__":
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main(sys.argv[1], sys.argv[2])
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