Polar projection

[Kowal]

How to connect the polar function and point projection on lwpoly?

(polar pt ang (distance to the object))

How to calculate the distance to an object?

Scheme is shown in the image.

[Tharwat]

Create Ray object rotated based on your given angle then check if the Ray intersecting with the polyline, if so then the distance will be from 'pt' to interested point.

NOTE:

This is if the intersecting is just once otherwise you need to iterate through the interested coordinates and get the closest coordinate to 'pt' coordinate.