Algorithm (Workflow)

This function, PLtrans0, is designed to transform a given point list by centering it around the origin. It is part of the SolidGeometry library and is classified under auxiliary procedures.

Input Parameters

• PL: A point list with dimensions nx2, where n is the number of points, and each point has two coordinates (x, y).

Output Results

• PL: The transformed point list, still with dimensions nx2, but now centered around the origin.

Algorithm Steps

1. The function VLaddz(PL,0) is called, which likely adds a third dimension (z-coordinate) with a value of 0 to each point in the list, converting it to an nx3 format.
2. The transformed list is then passed to VLtrans0, which centers the point list around the origin. This function is assumed to handle the transformation in three dimensions.
3. The result from VLtrans0 is then reduced back to two dimensions by selecting only the first two columns, PL(:,1:2), effectively discarding the z-coordinate.
4. If no output is requested (nargout==0), the function will plot the transformed point list using SGfigure and PLplot(PL).