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tweak to make the coin stacks more realistic

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Ben Hambrecht 2018-04-10 14:36:21 +02:00
parent 9b35a5daeb
commit 7ccabd7472
1 changed files with 6 additions and 1 deletions
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7
active_projects/eop/chapter1.py
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@ -200,7 +200,12 @@ class FlatCoin(UprightCoin):
# draw the ridges # draw the ridges
PI = TAU/2 PI = TAU/2
ridge_angles = np.arange(PI/self.nb_ridges,PI,PI/self.nb_ridges) dtheta = PI/self.nb_ridges
ridge_angles = np.arange(dtheta,PI,dtheta)
# add a twist onto each coin
ridge_angles += np.random.rand(1) * dtheta
# crop the angles that overshoot on either side
ridge_angles = ridge_angles[(ridge_angles > 0) * (ridge_angles < PI)]
ridge_positions = 0.5 * 2 * self.radius * np.array([ ridge_positions = 0.5 * 2 * self.radius * np.array([
np.cos(theta) for theta in ridge_angles np.cos(theta) for theta in ridge_angles
]) ])