Algorithm (Workflow)

This function, CPLplotcolors, is designed to plot closed polygon lines (CPL) with different colors. It is part of the SolidGeometry library and was introduced in version 4.3. The function takes in a CPL and optional parameters to customize the plot.

Input Parameters

• CPL: The main input, representing closed polygon lines.
• ind: Indices of the polygons to plot. If not specified, all polygons are plotted.
• fs: Optional font size for text annotations on the plot.

Output

• h: Handle to the graphics objects created by the plot.

Algorithm Steps

1. Initialize an empty array h to store graphics handles.
2. Retrieve the font size fs from the input parameters, defaulting to an empty array if not provided.
3. Retrieve the color line style cl from the input parameters, defaulting to 'r-' (red line) if not provided.
4. Determine the indices ind of the polygons to plot. If not specified, use all polygons by default.
5. Iterate over each index in ind:
• Determine the color ci for the current polygon using the colofn function, cycling through a predefined set of colors ('rbgkcmy').
• Determine a secondary color ci2 for text annotations.
• Initialize a text index ti to 1.
• Select the current polygon CPLi using the selectNaN function.
• Check if the polygon is counter-clockwise using CPLisccw. If not, append a dot to the color ci; otherwise, increment ti.
• Plot the polygon using CPLplot and store the handle in h.
• If a font size fs is specified, add a text annotation to the plot using textVL, labeling the polygon with its index.

The function is designed to provide a visual representation of closed polygon lines with customizable colors and optional text annotations, making it useful for graphical analysis and presentations.