Order polygon vertices clockwise ArcGIS Pro

MohamedHassan17 — Sat, 27 Jul 2024 19:43:18 GMT

I have a Python script that generates layout and I need to arrange the polygon vertices clockwise Like Image_1

my script to extract polygon vertices not clockwise.

def extract_polygon_vertices(feature_layer😞

results = []

with arcpy.da.SearchCursor(feature_layer, ["SHAPE@"]) as cursor:

for row in cursor:

geom = row[0]

if geom:

vertices = [(pnt.X, pnt.Y) for part in geom.getPart() for pnt in part if pnt]

vertices = order_vertices(vertices)

for i in range(len(vertices)):

if i > 0 and vertices[i] == vertices[i - 1]:

continue

pnt1 = vertices[i]

pnt2 = vertices[i - 1] if i > 0 else vertices[-1]

length = calculate_distance(pnt2, pnt1)

results.append((pnt1, pnt2, length))

else:

add_error_message("No geometry available.")

del cursor

return results

def order_vertices(vertices😞

"""

Order the vertices in a clockwise direction starting from the highest Y coordinate.

"""

if not vertices:

return []

ordered_vertices = []

# Get the highest Y coordinate

highest_y = max(vertices, key=lambda vertex: vertex[1])

highest_y_index = vertices.index(highest_y)

# Check if multiple points have the same highest Y and choose the most left one (smallest X)

top_points = [v for v in vertices if v[1] == highest_y[1]]

start_point = min(top_points, key=lambda vertex: vertex[0])

start_point_index = vertices.index(start_point)

# Order the points starting from start_point to the end, then from the beginning to start_point

ordered_vertices = vertices[start_point_index:] + vertices[:start_point_index]

return ordered_vertices

Image_2 : the incorrect ouptut

Re: Order polygon vertices clockwise ArcGIS Pro

DanPatterson — Sat, 27 Jul 2024 21:42:13 GMT

That is clockwise.

Re: Order polygon vertices clockwise ArcGIS Pro

MohamedHassan17 — Sun, 28 Jul 2024 06:29:42 GMT

okay, but my output not match the Image_1.
I need to arrange from the highest Y on the left then clockwise.

Re: Order polygon vertices clockwise ArcGIS Pro

DanPatterson — Sun, 28 Jul 2024 07:02:53 GMT

You want the point closest to the left-most top of the extent of the polygon, with

L - smallest X

R - largest X

B - smallest Y

T - largest Y

you want the point with the minimum distance to L,T

topic Re: Order polygon vertices clockwise ArcGIS Pro in Python Questions

Order polygon vertices clockwise ArcGIS Pro

Re: Order polygon vertices clockwise ArcGIS Pro

Re: Order polygon vertices clockwise ArcGIS Pro

Re: Order polygon vertices clockwise ArcGIS Pro