3b

2025/sketch_2025_01_03/sketch_2025_01_03b.py

@@ -0,0 +1,42 @@
+import py5
+from py5 import sin, cos, PI
+
+def setup():
+    py5.size(800, 800)
+    py5.translate(400, 400)
+    py5.background(0)
+    py5.no_stroke()
+    wave(390)
+
+def wave(r):
+    py5.fill(255 - r / 2, 255 - r / 2, 255)
+    vs = circle_arc_pts(0, 0, r, 0, py5.PI)        
+    vs += reversed(circle_arc_pts(-r/2, 0, r/2, 0, py5.PI))
+    vs += reversed(circle_arc_pts(r/2, 0, r/2, 0, py5.PI))
+    with py5.begin_shape():
+        py5.vertices(vs)
+    if r > 4:
+        with py5.push_matrix():
+            py5.translate(-r/2, 0)
+            py5.rotate(PI / 3)
+            wave(r/2)
+            py5.rotate(-PI / 3)
+            py5.translate(r, 0)
+            wave(r/2)
+
+def circle_arc_pts(x, y, radius, start, sweep):
+    return arc_pts(x, y, radius * 2, radius * 2, start, start + sweep)
+
+def arc_pts(cx, cy, w, h, start_angle, end_angle, num_points=24):
+    sweep_angle = end_angle - start_angle
+    pts_list = []
+    step_angle = float(sweep_angle) / num_points    
+    va = start_angle
+    side = 1 if sweep_angle > 0 else -1
+    while va * side < end_angle * side or abs(va - end_angle) < 0.0001:
+        pts_list.append((cx + cos(va) * w / 2.0,
+                         cy + sin(va) * h / 2.0))
+        va += step_angle
+    return pts_list
+
+py5.run_sketch()

docs/README.md

@@ -27,6 +27,10 @@ If you appreciate what I have been doing, you may also support my artistic work,
 
 ![sketch_2025_01_03](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_01_03/sketch_2025_01_03.png)
 
+The next day I think I improved it:
+
+![sketch_2025_01_03b](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_01_03/sketch_2025_01_03b.png)
+
 [sketch_2025_01_03](https://github.com/villares/sketch-a-day/tree/main/2025/sketch_2025_01_03) [[py5](https://py5coding.org/)]
 
 #genuary3 #genuary2025 "42 lines of code"