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villares · Jan 4, 2025 · 917242c · 917242c
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diff --git a/2025/sketch_2025_01_03/sketch_2025_01_03.png b/2025/sketch_2025_01_03/sketch_2025_01_03.png
diff --git a/2025/sketch_2025_01_03/sketch_2025_01_03.py b/2025/sketch_2025_01_03/sketch_2025_01_03.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)
+    with py5.begin_closed_shape():
+        py5.vertices(circle_arc_pts(0, 0, r, 0, py5.PI))
+    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_ang, sweep_ang, **kwargs):
+    return arc_pts(x, y, radius * 2, radius * 2, start_ang, start_ang + sweep_ang, **kwargs)
+
+def arc_pts(cx, cy, w, h, start_angle, end_angle, num_points=24, seg_len=None):
+    sweep_angle = end_angle - start_angle
+    if abs(sweep_angle) < 0.0001:
+        return [(cx + cos(start_angle) * w / 2.0, cy + sin(start_angle) * h / 2.0)]
+    if seg_len:
+        num_points = abs(sweep_angle * (w + h) / 4) / seg_len
+    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()
diff --git a/docs/README.md b/docs/README.md
@@ -21,6 +21,16 @@ If you appreciate what I have been doing, you may also support my artistic work,
 2025 \| [<b>2024</b>](2024.md) \| [<b>2023</b>](2023.md) \| [<b>2022</b>](2022.md) \| [<b>2021</b>](2021.md) \| [<b>2020</b>](2020.md) \| [<b>2019</b>](2019.md) \| [<b>2018</b>](2018.md) 
 
 
+---
+
+### sketch_2025_01_03
+
+![sketch_2025_01_03](https://raw.githubusercontent.com/villares/sketch-a-day/main/2025/sketch_2025_01_03/sketch_2025_01_03.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"
+
 ---
 
 ### sketch_2025_01_02