22

2024/sketch_2024_12_22/sketch_2024_12_22.py

@@ -0,0 +1,71 @@
+# Iscosahedron
+import py5
+from py5_tools import animated_gif
+import numpy as np
+
+sf = 2
+
+def setup():
+    py5.size(600, 600, py5.P3D)
+    animated_gif('out.gif', duration=0.066,
+                   frame_numbers=range(1, 361, 3))
+    py5.hint(py5.ENABLE_STROKE_PERSPECTIVE)
+
+def draw():
+    global ang
+    py5.translate(py5.width / 2, py5.height / 2, -py5.height)
+    ang = py5.radians(py5.frame_count)
+    py5.rotate_y(ang)
+    py5.rotate_x(ang)
+    py5.background(0, 0, 150)
+    py5.no_fill()
+    py5.stroke_weight(3 * sf)
+    py5.stroke(0)
+    icosahdron(py5.width / 3 * 2)
+    # the numbered faces
+    tris = sequence.reshape(20,3)
+    face_centers = vs[tris].mean(axis=1)    
+    py5.stroke(255, 0, 0)
+    py5.stroke_weight(6 * sf)
+    py5.fill(255)
+    py5.text_size(50)
+    py5.text_align(py5.RIGHT)
+    for i, v in enumerate(face_centers):
+        with py5.push_matrix():
+            py5.translate(*v)
+            py5.point(0, 0, -1)
+            py5.rotate_x(-ang)
+            py5.rotate_y(-ang)
+            py5.text(i, -12, 12, -5)
+
+def icosahdron(radius):
+    global vs, sequence
+    f = (radius / 2) # / 0.95 # aprox. ?
+    phi = (py5.sqrt(5) + 1) / 2
+    a = phi * f
+    b = 1 * f
+    vs = np.array([
+        (a,  b,  0),
+        (a,  -b,  0),
+        (-a,  -b,  0),
+        (-a,  b,  0),
+        (b,  0, a),
+        (-b,  0, a),
+        (-b,  0, -a),
+        (b, 0, -a),
+        (0, a, b),
+        (0, a, -b),
+        (0, -a, -b),
+        (0, -a, b),
+    ])
+    sequence = np.array([
+        2, 11, 5, 2, 5, 3, 5, 8, 3, 4, 8, 5, 11, 4, 5,
+        10, 2, 6, 2, 3, 6, 3, 9, 6, 3, 8, 9, 2, 10, 11,
+        1, 4, 11, 1, 0, 4, 7, 0, 1, 10, 1, 11, 0, 8, 4,
+        0, 9, 8, 7, 9, 0, 1, 10, 7, 10, 6, 7, 6, 9, 7,  
+    ])
+    with py5.begin_shape(py5.TRIANGLES):
+         py5.vertices(vs[sequence])
+
+    
+py5.run_sketch(block=False)

docs/README.md

@@ -30,6 +30,19 @@ Here are listed some of the tools I have been using more recently:
 2024 \| [<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_2024_12_22
+
+![sketch_2024_12_22](https://raw.githubusercontent.com/villares/sketch-a-day/main/2024/sketch_2024_12_22/sketch_2024_12_22.gif)
+
+[sketch_2024_12_22](https://github.com/villares/sketch-a-day/tree/main/2024/sketch_2024_12_22) [[py5](https://py5coding.org/)]
+
+```python
+tris = sequence.reshape(20,3)
+face_centers = vs[tris].mean(axis=1)  
+```
+
 ---
 
 ### sketch_2024_12_21