1

2025/sketch_2025_09_01/sketch_2025_09_01.py

@@ -0,0 +1,61 @@
+from itertools import product, permutations, combinations
+from pathlib import Path
+from functools import cache
+
+import py5
+from py5_tools import animated_gif
+from shapely import Polygon, MultiPolygon, LineString, MultiLineString
+from shapely import unary_union
+
+@cache
+def CachedPolygon(*args):
+    return Polygon(*args)
+
+def setup():
+    global combos, tris
+    py5.size(19 * 50, 4 * 50)
+    py5.color_mode(py5.HSB)
+    #animated_gif('out.gif', duration=1.2, frame_numbers=range(1, 13+1))
+    py5.stroke_join(py5.ROUND)
+    grid = list(product((-1, 0, 1), repeat=2))
+    tris = [Polygon(t) for t in combinations(grid, 3) if Polygon(t).area]
+    combos = [(tri,) for tri in tris]
+#     m = py5.millis()
+#     square_combos = [
+#         combo for combo in a4allcombos
+#         if unary_union(combo).area == 4
+#     ]
+#     print(f'time to pick only square combos {py5.millis()-m}')
+    print(len(combos))
+    
+    
+def draw():
+    py5.background(0)
+    py5.fill(255, 200)
+    N = 19 # rows and columns
+    i = 0 # py5.frame_count * N * N
+    s = py5.width / N
+    w = s / 2 - 5
+    for r in range(N):
+        for c in range(N):
+            x = s / 2 + s * c
+            y = s / 2 + s * r
+            draw_combo(i, x, y, w)
+            i += 1
+            
+def draw_combo(ci, x, y, w):
+    if ci < len(combos):
+        with py5.push_matrix():
+            py5.translate(x, y)
+            py5.scale(w)
+            py5.stroke_weight(1 / w)
+            combo = combos[ci]
+            for poly in combo:
+                py5.fill(poly.area * 100, 200, 200)
+                py5.shape(py5.convert_cached_shape(poly))
+
+def key_pressed():
+    py5.save('out.png')
+
+py5.run_sketch(block=False)
+

docs/README.md

@@ -27,6 +27,16 @@ If you appreciate what I have been doing, you may also support my artistic work,
 <!-- SKETCHES_START -->
 
 
+---
+
+### sketch_2025_09_01
+
+![sketch_2025_09_01](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_09_01/sketch_2025_09_01.png)
+
+[sketch_2025_09_01](https://github.com/villares/sketch-a-day/tree/main/2025/sketch_2025_09_01) [[py5](https://py5coding.org/)]
+
+All 76 possible triangles from connecting points of a 3x3 grid.
+
 ---
 
 ### sketch_2025_08_31