# Selecting a Path

Constraints in Easik are composed of paths with a predefined configuration. Though each constraint is defined differently, selecting paths occurs in a similar manner. Once a constraint has been chosen to add to the sketch, the user will be prompted to select a path.

## The Identity Path

A path in Easik can exist from an entity to itself, with a length of zero. This can be selected by selecting an entity as the start point of a path. To confirm this, select the Next or Finish button.

## Standard Paths

To begin selecting the path, select the first edge involved in the path. The edge will then appear highlighted in the default path selection color, red, or in the user-defined path selection color. The user can then choose to terminate the path, by selecting the Next or Finish buttons, depending on the situation, or continue to build the path.

To continue to build the path, select the next edge involved in the path. This edge must have as its domain, the codomain of the edge that immediately preceeds it. There is no upper bound to the length of a path.