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What are Constrained Points?

Constrained points ensure that a parametrically drawn line is straight but will restrict the ability to move the point freely.

Constrained points are automatically set when using the draw tool, and adding a new point to an existing line, or when clicking an existing point and ticking the snap to line checkbox on the select toolbar.

snap to line

Identifying Constrained Points

Constrained and unconstrained points are distinguished by their respective icons.

A constrained point, snapped to a line.
An unconstrained point

Stations as Constrained Points

Stations may be constrained in the same way as other constrained points. If you find that you are unable to move a station in any direction other than left or right across a line, unchecking snap to line will allow you to position your station in any location and the connected path will bend to accommodate.

moving stations