24

2025/sketch_2025_08_24/sketch_2025_08_24.py

@@ -0,0 +1,91 @@
+from itertools import product
+
+import py5
+from py5_tools import animated_gif
+from shapely import Polygon, MultiPolygon, LineString, MultiLineString
+
+shapes = []
+grid = list(product(range(64, 512, 128 + 64), repeat=2))   
+
+
+def setup():
+    py5.size(512, 512)
+    py5.no_smooth()
+    animated_gif('out.gif', duration=1, frame_numbers=range(1, 21))
+    setup_shapes()
+    py5.no_loop()
+    py5.stroke_join(py5.ROUND)
+
+def setup_shapes(num_shapes=4, buffer=16):
+    tri = Polygon()
+    while not tri.area:
+        shapes.clear()
+        pts = py5.random_sample(grid, 3 * num_shapes)#, replace=False)
+        for i in range(0, 3 * num_shapes, 3):
+            tri = Polygon(pts[i:i+3])
+            if tri.area == 0:
+                break
+            ang = i // 3 * py5.QUARTER_PI
+            shapes.append((0, ang, tri.buffer(buffer)))        
+        else:
+            continue
+            
+            
+def draw():
+    py5.background(200)
+
+    py5.no_fill()
+    for c, angle, shp in shapes:
+        #py5.stroke(c)
+        hatched_poly(
+            shp,
+            angle=angle,
+            spacing=5
+            )
+
+def hatched_poly(poly, angle=0, holes=[], spacing=5):
+    if not isinstance(poly, (Polygon, MultiPolygon)):
+        poly = Polygon(poly, holes)
+    py5.stroke_weight(3)    
+    py5.shape(py5.convert_shape(poly))
+    py5.stroke_weight(1)    
+    hatch = generate_hatch(poly, angle=angle,spacing=spacing)
+    py5.shape(py5.convert_shape(hatch))
+    #hatch = generate_hatch(poly, angle=angle + py5.HALF_PI,spacing=spacing)
+    #py5.shape(py5.convert_shape(hatch))
+
+def draw_poly(poly, holes=[]):
+    if not isinstance(poly, (Polygon, MultiPolygon)):
+        poly = Polygon(poly, holes)
+    py5.shape(py5.convert_cached_shape(poly))
+
+def generate_hatch(poly, angle=0, spacing=5, holes=[]):
+    #global p # for debugging
+    #p = poly
+    if not isinstance(poly, (Polygon, MultiPolygon)):
+        poly = Polygon(poly, holes)
+    if poly.area == 0:
+        return MultiLineString()
+    diagonal = py5.dist(*poly.bounds)  # diagonal length
+    #print(poly.bounds, diagonal, poly.area)
+    num = int(diagonal / spacing)
+    V = py5.Py5Vector
+    centroid = V(poly.envelope.centroid.x, poly.envelope.centroid.y)
+    a = V(-diagonal / 2, -diagonal / 2).rotate(angle) + centroid
+    b = V(-diagonal / 2, +diagonal / 2).rotate(angle) + centroid
+    c = V(+diagonal / 2, -diagonal / 2).rotate(angle) + centroid
+    d = V(+diagonal / 2, +diagonal / 2).rotate(angle) + centroid
+#     py5.stroke(255, 0, 0) # for debugging
+#     with py5.begin_closed_shape():
+#         py5.vertices((a, b, d, c))
+#     py5.stroke(0)
+    lines = [LineString((V.lerp(a, b, i / num), V.lerp(c, d, i / num)))
+             for i in range(num + 1)]
+    return MultiLineString(lines).intersection(poly)
+
+def key_pressed():
+    #py5.save_frame('###.png')
+    setup_shapes()
+    py5.redraw()
+
+py5.run_sketch(block=False)

docs/README.md

@@ -26,6 +26,16 @@ If you appreciate what I have been doing, you may also support my artistic work,
 
 <!-- SKETCHES_START -->
 
+### sketch_2025_08_24
+
+![sketch_2025_08_24](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_08_24/sketch_2025_08_24.gif)
+
+[sketch_2025_08_24](https://github.com/villares/sketch-a-day/tree/main/2025/sketch_2025_08_24) [[py5](https://py5coding.org/)]
+
+
+
+---
+
 ### sketch_2025_08_23
 
 ![sketch_2025_08_23](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_08_23/sketch_2025_08_23.png)