How to use the pyclipper.CT_INTERSECTION function in pyclipper

import pyclipper


"""
General Suggestions:
- Contours should only be sent here if they actually overlap.
  This can be checked easily using contour bounds.
- Only perform operations on closed contours.
- contours must have an on curve point
- some kind of a log
"""


_operationMap = {
    "union": pyclipper.CT_UNION,
    "intersection": pyclipper.CT_INTERSECTION,
    "difference": pyclipper.CT_DIFFERENCE,
    "xor": pyclipper.CT_XOR,
}

_fillTypeMap = {
    "evenOdd": pyclipper.PFT_EVENODD,
    "nonZero": pyclipper.PFT_NONZERO,
    # we keep the misspelling for compatibility with earlier versions
    "noneZero": pyclipper.PFT_NONZERO,
}


def clipExecute(subjectContours, clipContours, operation, subjectFillType="nonZero",
                clipFillType="nonZero"):
    pc = pyclipper.Pyclipper()

polygon1 : list of arrays
        Vertices of the second polygon in counterclockwise order.

    Returns
    -------
    intersection : list of arrays
        Vertices of the intersection in counterclockwise order.
    """
    from pyclipper import Pyclipper, PT_CLIP, PT_SUBJECT, CT_INTERSECTION
    from pyclipper import scale_to_clipper, scale_from_clipper
    # could be accelerated by removing the scale_to/from_clipper()
    subj, clip = (polygon1,), polygon2
    pc = Pyclipper()
    pc.AddPath(scale_to_clipper(clip), PT_CLIP)
    pc.AddPaths(scale_to_clipper(subj), PT_SUBJECT)
    solution = pc.Execute(CT_INTERSECTION)
    if not solution:
        return []
    return scale_from_clipper(solution)[0]

def clip_poly_pair(pc, p, q):
    """"
    pc: an instance of pyclipper.Pyclipper. 
    p:  the polygon by which to clip other polygon q. 

    pc and p may be held fixed through use of functools.partial so that 
    multiple q may be clipped by p.
    """
    pc.Clear()
    pc.AddPath(q, pyclipper.PT_SUBJECT, True)
    pc.AddPath(p, pyclipper.PT_CLIP, True)
    clip_polys = pc.Execute(clip_type=pyclipper.CT_INTERSECTION)
    return clip_polys

def clip(subj, clip_paths, subj_closed=True):
    if not subj:
        return []
    if not clip_paths:
        return []
    pc = pyclipper.Pyclipper()
    if subj:
        subj = pyclipper.scale_to_clipper(subj, SCALING_FACTOR)
        pc.AddPaths(subj, pyclipper.PT_SUBJECT, subj_closed)
    if clip_paths:
        clip_paths = pyclipper.scale_to_clipper(clip_paths, SCALING_FACTOR)
        pc.AddPaths(clip_paths, pyclipper.PT_CLIP, True)
    out_tree = pc.Execute2(pyclipper.CT_INTERSECTION, pyclipper.PFT_EVENODD, pyclipper.PFT_EVENODD)
    outpaths = pyclipper.PolyTreeToPaths(out_tree)
    outpaths = pyclipper.scale_from_clipper(outpaths, SCALING_FACTOR)
    return outpaths

polygon1 : list of arrays
        Vertices of the second polygon in counterclockwise order.

    Returns
    -------
    intersection : list of arrays
        Vertices of the intersection in counterclockwise order.
    """
    from pyclipper import Pyclipper, PT_CLIP, PT_SUBJECT, CT_INTERSECTION
    from pyclipper import scale_to_clipper, scale_from_clipper
    # could be accelerated by removing the scale_to/from_clipper()
    subj, clip = (polygon1,), polygon2
    pc = Pyclipper()
    pc.AddPath(scale_to_clipper(clip), PT_CLIP)
    pc.AddPaths(scale_to_clipper(subj), PT_SUBJECT)
    solution = pc.Execute(CT_INTERSECTION)
    if not solution:
        return []
    return scale_from_clipper(solution)[0]