The methods described below can be used to add more details to drawings created by the following visualization methods:

Polytope::VISUAL_FACE_LATTICE | Polytope::VISUAL_DUAL_FACE_LATTICE

MIN_MAX_FACE ([ LPobject ])
Illustrate the behavior of a linear objective function on the polytope. Draw the filters of the MAXIMAL_FACE and MINIMAL_FACE in distinguished colors (by default, red and yellow).
The optional parameter LPobject is introduced for the future use, when it will be possible to store several objective function in a Polytope object.

Each auxiliary method always returns the visual object it has called with ($this), which makes it easy to build longer method chains of the kind: VISUAL->DIRECTED_GRAPH->VERTEX_COLORS .