Compute division of Lake Constance

bodensee-borders

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+#!/usr/bin/python3
+
+from PIL import Image
+im = Image.open("bodensee-m3.png")
+print(im.format, im.size, im.mode)
+region_colors = {
+    (  0,   0, 255, 255),
+    (  0, 255, 255, 255),
+    (  0, 255,   0, 255),
+    (255, 255,   0, 255),
+    (255,   0,   0, 255),
+}
+seeds = {c: [] for c in region_colors}
+for y in range(0, im.size[1]):
+    for x in range(0, im.size[0]):
+        p = im.getpixel((x, y))
+        if p in region_colors:
+            seeds[p].append((x, y))
+for y in range(0, im.size[1]):
+    print(f"{y}")
+    for x in range(0, im.size[0]):
+        p = im.getpixel((x, y))
+        if p[3] == 0:
+            best_color = (0, 0, 0, 255)
+            min_d2 = 10_000_000
+            for color, points in seeds.items():
+                for p in points:
+                    dx = p[0] - x
+                    dy = p[1] - y
+                    d2 = dx * dx + dy * dy
+                    if d2 < min_d2:
+                        best_color = color
+                        min_d2 = d2
+            best_color = (*best_color[:3], 127)
+            im.putpixel((x, y), best_color)
+
+im.save("bodensee-r3.png")

trintignant.times

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+pypy3 ./bodensee-borders  2.90s user 0.05s system 99% cpu 2.949 total
+/usr/bin/python3 ./bodensee-borders  141.92s user 0.12s system 99% cpu 2:23.27 total
+pypy3 ./bodensee-borders  2.21s user 0.04s system 99% cpu 2.254 total
+/usr/bin/python3 ./bodensee-borders  150.12s user 0.37s system 95% cpu 2:36.91 total
+pypy3 ./bodensee-borders  4.98s user 0.10s system 94% cpu 5.359 total
+/usr/bin/python3 ./bodensee-borders  214.28s user 0.82s system 95% cpu 3:44.37 total
+pypy3 ./bodensee-borders  2.11s user 0.04s system 99% cpu 2.148 total
+/usr/bin/python3 ./bodensee-borders  119.05s user 0.09s system 99% cpu 1:59.57 total
+pypy3 ./bodensee-borders  2.06s user 0.07s system 99% cpu 2.131 total
+/usr/bin/python3 ./bodensee-borders  98.09s user 0.05s system 99% cpu 1:38.19 total
+pypy3 ./bodensee-borders  2.01s user 0.06s system 99% cpu 2.072 total
+/usr/bin/python3 ./bodensee-borders  95.76s user 0.02s system 99% cpu 1:35.79 total
+pypy3 ./bodensee-borders  2.03s user 0.06s system 99% cpu 2.093 total
+/usr/bin/python3 ./bodensee-borders  91.87s user 0.06s system 99% cpu 1:31.96 total
+pypy3 ./bodensee-borders  2.06s user 0.05s system 99% cpu 2.109 total
+/usr/bin/python3 ./bodensee-borders  117.41s user 0.05s system 99% cpu 1:58.12 total
+pypy3 ./bodensee-borders  2.08s user 0.05s system 99% cpu 2.125 total
+/usr/bin/python3 ./bodensee-borders  98.99s user 0.06s system 99% cpu 1:39.08 total
+
+% pypy3 --version
+Python 3.8.13 (7.3.9+dfsg-1ubuntu0.1, Nov 15 2022, 06:22:50)
+[PyPy 7.3.9 with GCC 11.3.0]
+
+/usr/bin/python3 --version
+Python 3.10.12
+
+% lsb_release -a
+Distributor ID:	Ubuntu
+Description:	Ubuntu 22.04.4 LTS
+Release:	22.04
+Codename:	jammy
+
+(screen-sizes) trintignant:~/tmp/bodensee 19:50 :-) 1073% egrep 'vendor_id|cpu family|model|stepping|cpu MHz|cache size' /proc/cpuinfo | sort | uniq -c
+      4 cache size	: 4096 KB
+      3 cpu MHz		: 1600.000
+      1 cpu MHz		: 578.717
+      4 cpu family	: 6
+      4 model		: 142
+      4 model name	: Intel(R) Core(TM) i5-7Y54 CPU @ 1.20GHz
+      4 stepping	: 9
+      4 vendor_id	: GenuineIntel
+