Algorithm (Workflow)

This algorithm extracts vertex points from line objects in the current axes of a MATLAB figure and compiles them into a list. The function is part of the SolidGeometry library and is used for visualization purposes.

Input Parameters

The function VLofgcalines does not take any input parameters. It operates on the current axes in a MATLAB figure, which is accessed using gca.

Output

The function returns a matrix VL, where each row represents a vertex point with its X, Y, and Z coordinates.

Algorithm Steps

1. Find all line objects in the current axes using findobj(gca, 'Type', 'Line'). This returns a handle array h of line objects.
2. Initialize a large matrix VL with 100,000 rows and 3 columns to store the vertex points. This is a preallocation step to improve performance.
3. Initialize a counter k to zero. This counter keeps track of the number of vertex points added to VL.
4. Iterate over each line object in h:
• Extract the X, Y, and Z data of the current line object and transpose them to form a matrix VLi where each row is a vertex point.
• Determine the number of vertex points ni in VLi.
• Copy the vertex points from VLi into the appropriate rows of VL, starting from the row indexed by k+1.
• Update the counter k by adding ni to it.
5. After processing all line objects, truncate VL to only include the rows that contain vertex points, i.e., the first k rows.

Example Usage

The function can be used in conjunction with other visualization functions such as SGfigure, CVLplots, and zoomVL to display and manipulate the vertex points in a MATLAB figure.