Data update

Task/Peripheral-drift-illusion/EasyLang/peripheral-drift-illusion.easy

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+n = 15
+offs = 0.7
+r = (100 / (3 * n + 1))
+step = 360 * 2 / (n - 1)
+#
+background 470
+clear
+for row = 0 to n - 1
+   for col = 0 to n - 1
+      x = (3 * col + 2) * r
+      y = (3 * row + 2) * r
+      #
+      h = col * step + row * step
+      move (x + offs * cos h) (y + offs * sin h)
+      color 999
+      circle r
+      #
+      h += 180
+      move (x + offs * cos h) (y + offs * sin h)
+      color 000
+      circle r
+      #
+      move x y
+      color 128
+      circle r
+   .
+.