Sketcher ConstrainPointOnObject

Sketcher ConstrainPointOnObject
Menu location
Sketch → Constraints → Point-On-Object Constraint
Workbenches
Sketcher
Default shortcut
O
Introduced in version
-
See also
Sketcher ConstrainCoincidentUnified, Sketcher ConstrainCoincident

Description

The Sketcher ConstrainPointOnObject tool fixes points on edges or axes. Lines are treated as infinite, and open curves are virtually extended as well.

introduced in 1.0: This tool is replaced by the Sketcher ConstrainCoincidentUnified tool if the Unify coincident and point-on-object constraints option is selected in the preferences.

Usage

See also: Drawing aids.

Continue mode

1. Make sure there is no selection.
2. There are several ways to invoke the tool:
   • Press the Point-On-Object Constraint button.
   • Select the Sketch → Constraints → Point-On-Object Constraint option from the menu.
   • Use the keyboard shortcut: O.
3. The cursor changes to a cross with the tool icon.
4. Select a single point and a single edge (in any order).
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 a single point and a single edge (in any order).
   • Select several points and a single edge (idem).
   • Select a single point and several edges (idem).
2. Invoke the tool as described above, or with the following additional option:
   • Right-click in the Elements section of the Sketcher Dialog and select the Point-On-Object Constraint option from the context menu.
3. Depending on the selection one or more constraints are added.

Scripting

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

Sketch.addConstraint(Sketcher.Constraint('PointOnObject',LineMoving,PointOfLineMoving,LineFixed))

• Sketch is a sketch object.
• LineMoving is the number that designates the line, which contains the point that has to be moved on the LineFixed (the line which is fixed).
• PointOfLineMoving is the number of the vertex of line LineMoving, that has to be moved on the LineFixed.
• LinedFixed is the number of the line to be affixed on the point PointOfLineMoving.

The Sketcher scripting page explains how to identify the numbers that designate lines and points.