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2020/sketch_2020_01_21a/sketch_2020_01_21a.pyde

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+from __future__ import division
+add_library('VideoExport')
+
+def setup():
+    size(600, 600)
+    global videoExport
+    videoExport = VideoExport(this)
+    videoExport.startMovie()    
+    smooth(8)
+    colorMode(HSB)
+    
+def draw():
+    background(240)
+    translate(width / 2, height / 2)
+    num_points = 360
+    n_scale = .005
+    a = TWO_PI / num_points
+    x_off = y_off = width
+    for radius in range(500, 10, -30):
+        f = frameCount + radius / 2
+        fill(radius / 2, 200, 200, 100)
+
+        beginShape()
+        for i in range(num_points):
+            ny = 100 * sin(a * i) + x_off
+            nx = 100 * cos(a * i) + y_off
+            r = radius - radius * noise(nx * n_scale,
+                               ny * n_scale,
+                               f * n_scale)
+            y = r * sin(a * i)
+            x = r * cos(a * i)
+            vertex(x, y)
+        endShape(CLOSE)
+        
+    videoExport.saveFrame()
+    
+def keyPressed():        
+    if key == 's':
+        saveFrame("s####.png")
+    if key == 'q':
+        videoExport.endMovie()
+        exit()