Algorithm (Workflow)

This function, CPLflipud, is designed to flip the order of points in each contour of a Closed Polygon Line (CPL) without altering the sequence of the contours themselves. Below is a detailed explanation of the algorithm and its parameters:

Input Parameters

• CPL: A Closed Polygon Line where contours are separated by nan nan values. This input represents a series of points that form closed shapes, with each shape separated by nan values.

Algorithm Steps

1. The function begins by determining the number of separate contours within the CPL using the separateNaN function. This function counts how many distinct contours are present by identifying the nan nan separators.
2. A copy of the input CPL is made and stored in CPLN to preserve the original data.
3. A loop iterates over each contour (from 1 to n, where n is the number of contours identified).
4. Within the loop, for each contour, the function selectNaN is used to extract the specific contour from CPLN.
5. The extracted contour is then flipped upside down using the flipud function, which reverses the order of the points in the contour.
6. The flipped contour is then placed back into CPLN at the same position using the replaceNaN function.
7. After processing all contours, if no output argument is specified (i.e., nargout==0), the function calls CPLisccw to check the orientation of the contours and textCVL to display the contours.

Additional Notes

This function is part of the SolidGeometry library and was introduced in version 4.7. It is specifically designed to handle closed polygon lists, ensuring that the orientation of each contour is flipped without altering the overall structure of the CPL.