\debug_point

Description 

\debug_point is only used for debugging diagram during its elaboration. It should be used inside of a step block to draw additional information for current step. The system displays symbols name of vertices extremities of visible edges. So if a vertex doesn't appear the reason is that all edges which it belongs to are currently hidden.

This operator is useful to locate vertices after application of operators that alter internal vertices coordinates as \turn_over_vertical (cf. §) for instance. This operator has two syntaxes. The shorter (without parameter) is a quick way to have a global view of vertices. The second one (the more precise) can be seen as a query operator since it replies to the question ``Where are located point...?'' This form takes a list of vertex name in parameter, vertices are separated by comma (',').
This operator should only appear within a step block.

Usage

  \debug_point;          % Display the name of all vertices
  \debug_point(a, cd1);  % Useful to locate some points

Formal structure

  \debug_point;
  \debug_point(VERTICES_LIST);

Parameters

  VERTICES_LIST  : All searched vertices.
  Type           : List of vertex symbols.
  Allowed values : Any sequence of vertex identifiers already 
                   defined in previous steps.