Sketcher ConstrainPerpendicular

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Sketcher ConstrainPerpendicular

Menu location
Sketch → Sketcher constraints → Constrain perpendicular
Workbenches
Sketcher
Default shortcut
N
Introduced in version
-
See also
Sketcher Constrain angle

Description

The Sketcher ConstrainPerpendicular tool constrains two lines to be perpendicular, or two edges to be perpendicular at their intersection. One of the lines or edges can be an axis. Lines are treated as infinite, and arcs are treated as full circles/ellipses. The constraint can also connect two edges, forcing them to be perpendicular at the joint.

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 Constrain perpendicular button.
    • Select the Sketch → Sketcher constraints → Constrain perpendicular option from the menu.
    • introduced in version 0.22: Right-click in the 3D view and select the Constrain → Constrain perpendicular option from the context menu.
    • Use the keyboard shortcut: N.
  3. The cursor changes to a white cross with the tool icon.
  4. Do one of the following:
    • Select two edges. One of the edges must be a straight line or an axis. The other can be any edge except a B-spline.
    • Select a point and two edges (in that order).
    • Select an edge, a point and another edge (idem).
  5. A Perpendicular constraint is added. If a point and two edges have been selected, up to two Point onto object constraints can also be added. See Examples.
  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 edges (see above).
    • Select two endpoints belonging to different edges.
    • Select an edge and the endpoint of another edge (in any order).
    • Select a point and two edges (idem).
  2. Invoke the tool as explained above.
  3. A Perpendicular constraint is added. If a point and two edges have been selected, up to two Point onto object constraints can also be added. See Examples.

Examples

Between two edges

The two edges are made perpendicular at their (virtual) intersection. If one of the edges is a conic, a Point object that has a Point onto object constraint with both (extended) edges is added.

Between two endpoints

The endpoints are made coincident, and the edges are made perpendicular at that point.

Between edge and endpoint

The endpoint of one edge is constrained to lie on the other edge, and the edges are made perpendicular at that point.

Between two edges at point

The two edges are made perpendicular at a given point. The point can be any point, e.g. the center of a circle, the endpoint of an edge, or the origin, it can belong to one of the edges, and it can also be a Point object. If required Point onto object constraint(s) are added to ensure the point lies on both (extended) edges. These additional constraints are called helper constraints.

Scripting

Perpendicular Constraint can be created from macros and from the python console by using the following:

# direct perpendicularity
Sketch.addConstraint(Sketcher.Constraint('Perpendicular',icurve1,icurve2))

# point-to-point perpendicularity
Sketch.addConstraint(Sketcher.Constraint('Perpendicular',icurve1,pointpos1,icurve2,pointpos2))

# point-to-curve perpendicularity
Sketch.addConstraint(Sketcher.Constraint('Perpendicular',icurve1,pointpos1,icurve2))

# perpendicular-via-point (plain constraint, helpers are not added automatically)
Sketch.addConstraint(Sketcher.Constraint('PerpendicularViaPoint',icurve1,icurve2,geoidpoint,pointpos))

where:

  • Sketch is a sketch object
  • icurve1, icurve2 are two integers identifying the curves to be made perpendicular. The integers are indexes in the sketch (the value, returned by Sketch.addGeometry).
  • pointpos1, pointpos2 should be 1 for start point and 2 for end point.
  • geoidpoint and pointpos in PerpendicularViaPoint are the indexes specifying the point of perpendicularity.

The Sketcher scripting page explains the values which can be used for icurve1, icurve2, pointpos1, pointpos2 and geoidpoint, and contains further examples on how to create constraints from Python scripts.