Optimized Alpha Example

Using the optimized alpha function for obtaining the alpha parameter.

 import alphashape
 import matplotlib.pyplot as plt
 from descartes import PolygonPatch

 # Define input points
 points = [(0., 0.), (0., 1.), (1., 1.), (1., 0.),
           (0.5, 0.25), (0.5, 0.75), (0.25, 0.5), (0.75, 0.5)]

 # Determine the optimized alpha parameter
 alpha = alphashape.optimizealpha(points)

 # Generate the alpha shape
 alpha_shape = alphashape.alphashape(points, alpha)

 # Initialize plot
 fig, ax = plt.subplots()

 # Plot input points
 ax.scatter(*zip(*points))

 # Plot alpha shape
 ax.add_patch(PolygonPatch(alpha_shape, alpha=.2))

 plt.show()