Sketcher: Vincolo Coincidenza di punti

From FreeCAD Documentation
This page is a translated version of the page Sketcher ConstrainCoincident and the translation is 15% complete.
Outdated translations are marked like this.


Posizione nel menu
Sketch → Vincoli → Coincidenza
Avvio veloce
Introdotto nella versione
Vedere anche
Blocca, Punto su oggetto


The Sketcher ConstrainCoincident tool creates a coincident constraint between points, or (introduced in version 0.21) a concentric constraint between circles, arcs and/or ellipses (by making their centers coincident).

introduced in version 1.0: This tool is replaced by the Sketcher ConstrainCoincidentUnified tool if the Unify Coincident and PointOnObject option is selected in the preferences.


See also: Drawing aids.

Continue mode

  1. Make sure there is no selection.
  2. There are several ways to invoke the tool:
    • Press the Constrain coincident button.
    • Select the Sketch → Sketcher constraints → Constrain coincident option from the menu.
    • Use the keyboard shortcut: C.
  3. The cursor changes to a cross with the tool icon.
  4. Do one of the following:
    • Select two points.
    • Select two edges of circles, arcs, ellipses or arcs of ellipses.
  5. A constraint is added.
  6. Optionally keep creating constraints.
  7. To finish, right-click or press Esc, or start another geometry or constraint creation tool.

Run-once mode

  1. Do one of the following:
    • Select two or more points.
    • Select two or more edges of circles, arcs, ellipses or arcs of ellipses.
  2. Invoke the tool as explained above.
  3. Depending on the selection one or more constraints are added.


Script generico

Il vincolo può essere creato dalle macro e dalla console python utilizzando il seguente comando:

The constraint can be created from macros and from the Python console by using the following command:



  • Sketch è un oggetto schizzo.
  • LineFixed è il numero della linea, che non deve muoversi applicando il vincolo.
  • PointOfLineFixed è il numero del vertice della linea LineFixed che deve soddisfare il vincolo.
  • LineMoving è il numero della linea che si sposterà applicando il vincolo.
  • PointOfLineMoving è il numero della linea LineMoving che deve soddisfare il vincolo.

As the names LineFixed and LineMoving indicate, if both constrained vertices are free to move in any direction, the first one (first to be selected in the Gui) will remain fixed and the other one will move. In the presence of existing constraints, however, both edges may move.

The Sketcher scripting page explains the values which can be used for LineFixed, PointOfLineFixed, LineMoving and PointOfLineMoving, and contains further examples on how to create constraints from Python scripts.