Sketcher ConstrainDistance: Difference between revisions

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{{Docnav
|[[Sketcher_ConstrainDistanceY|Vertical Distance]]
|[[Sketcher_ConstrainRadius|Radius]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_ConstrainDistanceY.svg
|IconR=Sketcher_ConstrainRadius.svg
|IconC=Workbench_Sketcher.svg
}}

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{{GuiCommand
{{GuiCommand|Name=Constraint Length|Workbenches=[[Sketcher Workbench|Sketcher]], [[PartDesign Workbench|PartDesign]]|MenuLocation=Sketch → Sketcher constraints → Constrain distance|SeeAlso=[[Constraint HorizontalDistance|Constraint HorizontalDistance]], [[Constraint VerticalDistance|Constraint VerticalDistance]]}}
|Name=Sketcher ConstrainDistance
|MenuLocation=Sketch → Sketcher constraints → Constrain distance
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Shortcut={{KEY|Shift}} + {{KEY|D}}
|SeeAlso=[[Sketcher_ConstrainDistanceX|Sketcher Constrain horizontal distance]], [[Sketcher_ConstrainDistanceY|Sketcher Constrain vertical distance]]
}}


====Description==== <!--T:2-->
==Description== <!--T:23-->
Constraint Length constrains the length of a line, the perpendicular distance between a point and a line or the distance between two points to have a specified value.


====Hint==== <!--T:3-->
<!--T:2-->
'''Constrain distance''' constrains the length of a line, the perpendicular distance between a point and a line or the distance between two points to have a specified value.
If applicable please consider using the [[Constraint_HorizontalDistance|Horizontal Distance]] or [[Constraint_VerticalDistance|Vertical Distance]] constraints instead. These constraints are more robust and faster to calculate than the here documented length constraint.


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====Operation==== <!--T:4-->
[[Image:Sketcher_ConstrainDistance_example.png]]
Select a line in the sketch,<br />
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[[File:LengthConstraint1.png|256px]]<br />
by clicking on the line (it turns dark green).<br />
[[File:LengthConstraint2.png|256px]]<br />
Apply the Length Constraint by selecting the icon [[File:Constraint_Length.png|16px]] from the Sketcher Constraints toolbar or selecting the Constrain distance menu item from the Sketcher Constraints sub-menu of the Sketcher menu item in the Sketcher workbench (or Part Design in the Part Design workbench).<br />
[[File:LengthConstraint3.png|256px]]<br />
The length of the line is constrained to its current value.Double clicking on the constraint in the 3D view or in the Tasks tab of the Combo View will bring up a dialog box to allow the constraint value to be edited.<br />
[[File:LengthConstraint4.png|256px]]<br />
Enter the required value and click OK to set the constraint length.<br />
[[File:LengthConstraint5.png|256px]]<br />
The Length Constraint also constrains the distance between a line and a point.<br />
[[File:LengthConstraint6.png|256px]]<br />
Select the line and a point in the sketch,<br />
[[File:LengthConstraint7.png|256px]]<br />
then apply the constraint as before.<br />
The perpendicular distance between the point and the line is constrained to its current value. this may be edited as described above to set the constraint to a desired value.<br />
[[File:LengthConstraint8.png|256px]]<br />
The constraint may also be applied to two points, selected here at either end of a poly-line.<br />
[[File:LengthConstraint9.png|256px]]<br />
Applying the constraint as before, the distance between the two selected points is constrained. As described above it may be edited to set a desired value.<br />
[[File:LengthConstraint10.png|256px]]<br />


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==Usage== <!--T:9-->

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<!--T:10-->
# Pick two points or one line or one point and one line.
# Invoke the command several ways:
#* Press the {{Button|[[File:Sketcher_ConstrainDistance.svg|16px]] [[Sketcher_ConstrainDistance|Constrain distance]]}} button in the Sketcher toolbar.
#* Use the {{KEY|Shift}} + {{KEY|D}} keyboard shortcut. ('''D''' is for '''D'''istance)
#* Use the {{MenuCommand|Sketch → Sketcher constraints → [[File:Sketcher_ConstrainDistance.svg|16px]] Constrain distance}} entry from the top menu.
# A pop up dialog opens to edit or confirm the value. Press {{Button|OK}} to validate.

<!--T:8-->
'''Note:''' the constraint tool can also be started with no prior selection. To set the perpendicular distance between a point and a line, the point needs to be selected first. By default the command will be in continue mode to create new constraints; press the right mouse button or {{KEY|Esc}} once to quit the command.

===Hint=== <!--T:16-->

<!--T:3-->
If applicable please consider using the {{Button|[[File:Sketcher_ConstrainDistanceX.svg|16px]] [[Sketcher_ConstrainDistanceX|Horizontal distance]]}} or {{Button|[[File:Sketcher_ConstrainDistanceY.svg|16px]] [[Sketcher_ConstrainDistanceY|Vertical distance]]}} constraints instead. These constraints are more robust and faster to calculate than the '''ConstrainDistance''' tool.

== Scripting == <!--T:17-->

<!--T:18-->
Distance from origin:


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{{Code|code=Sketch.addConstraint(Sketcher.Constraint('DistanceX', Edge, PointOfEdge, App.Units.Quantity('123.0 mm')))}}
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Distance between two vertices:

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{{Code|code=Sketch.addConstraint(Sketcher.Constraint('Distance', Edge1, PointOfEdge1, Edge2, PointOfEdge2, App.Units.Quantity('123.0 mm')))}}
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<!--T:20-->
Length of line (the GUI allows selecting the edge itself, but it is just a shorthand for using the two extremities of the same line):

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{{Code|code=Sketch.addConstraint(Sketcher.Constraint('Distance', Line, 1, Line, 2, App.Units.Quantity('123.0 mm')))}}
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<!--T:21-->
Distance from point ({{incode|Edge, PointOfEdge}}) to nearest point on line ({{incode|Line}}):

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{{Code|code=Sketch.addConstraint(Sketcher.Constraint('Distance', Edge, PointOfEdge, Line, App.Units.Quantity('123.0 mm')))}}
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<!--T:22-->
The [[Sketcher_scripting|Sketcher scripting]] page explains the values which can be used for {{incode|Edge1}}, {{incode|Edge2}}, {{incode|Edge}}, {{incode| PointOfEdge1}}, {{incode| PointOfEdge2}}, {{incode|PointOfEdge}} and {{incode|Line}}, and contains further examples on how to create constraints from Python scripts.


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{{Docnav
|[[Sketcher_ConstrainDistanceY|Vertical Distance]]
|[[Sketcher_ConstrainRadius|Radius]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_ConstrainDistanceY.svg
|IconR=Sketcher_ConstrainRadius.svg
|IconC=Workbench_Sketcher.svg
}}

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{{Sketcher Tools navi{{#translation:}}}}
{{Userdocnavi{{#translation:}}}}

Revision as of 09:15, 12 September 2021

Sketcher ConstrainDistance

Menu location
Sketch → Sketcher constraints → Constrain distance
Workbenches
Sketcher
Default shortcut
Shift + D
Introduced in version
-
See also
Sketcher Constrain horizontal distance, Sketcher Constrain vertical distance

Description

Constrain distance constrains the length of a line, the perpendicular distance between a point and a line or the distance between two points to have a specified value.

Usage

  1. Pick two points or one line or one point and one line.
  2. Invoke the command several ways:
    • Press the Constrain distance button in the Sketcher toolbar.
    • Use the Shift + D keyboard shortcut. (D is for Distance)
    • Use the Sketch → Sketcher constraints → Constrain distance entry from the top menu.
  3. A pop up dialog opens to edit or confirm the value. Press OK to validate.

Note: the constraint tool can also be started with no prior selection. To set the perpendicular distance between a point and a line, the point needs to be selected first. By default the command will be in continue mode to create new constraints; press the right mouse button or Esc once to quit the command.

Hint

If applicable please consider using the Horizontal distance or Vertical distance constraints instead. These constraints are more robust and faster to calculate than the ConstrainDistance tool.

Scripting

Distance from origin:

Sketch.addConstraint(Sketcher.Constraint('DistanceX', Edge, PointOfEdge, App.Units.Quantity('123.0 mm')))

Distance between two vertices:

Sketch.addConstraint(Sketcher.Constraint('Distance', Edge1, PointOfEdge1, Edge2, PointOfEdge2, App.Units.Quantity('123.0 mm')))

Length of line (the GUI allows selecting the edge itself, but it is just a shorthand for using the two extremities of the same line):

Sketch.addConstraint(Sketcher.Constraint('Distance', Line, 1, Line, 2, App.Units.Quantity('123.0 mm')))

Distance from point (Edge, PointOfEdge) to nearest point on line (Line):

Sketch.addConstraint(Sketcher.Constraint('Distance', Edge, PointOfEdge, Line, App.Units.Quantity('123.0 mm')))

The Sketcher scripting page explains the values which can be used for Edge1, Edge2, Edge, PointOfEdge1, PointOfEdge2, PointOfEdge and Line, and contains further examples on how to create constraints from Python scripts.