This package presents C++ tools to the trace transform of a 2D image, and related objects, i.e. circuses and triple features, matlab tools to visualise these entities, and tools to check newly coded functionals. This version is released with a small number of functionals only. -This package presents C++ tools to the trace transform of a 2D image, and related objects, i.e. circuses and triple features, matlab tools to visualise these entities, and tools to check newly coded functionals.　This version is released with a small number of functionals only.