Source code for asterism.core.geometry.distance

"""

"""


from __future__ import division, absolute_import, print_function

from scipy.spatial.distance import  cdist

__author__ = 'andrea tramacere'



def dist_eval(coords2d,index=None,x_c=None,y_c=None,metric='euclidean',selected=None):

    if index is None and x_c is  None and  y_c is  None:
        raise RuntimeError("you must provide either index or x_c,y_c")

    if index is None and (x_c is None or y_c is None):
        raise RuntimeError("you must provide either index or x_c,y_c")


    if index is not None:
        x_ref=[coords2d[index]]
    else:
        x_ref=[[x_c,y_c]]

    if selected is None:
        d= cdist(x_ref,coords2d,metric)[0]
    else:
        d= cdist(x_ref,coords2d[selected],metric)[0]

    return d