Sketcher ConstrainCoincident: Difference between revisions
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|[[Sketcher_ConstrainCoincidentUnified|Coincident (unified)]] |
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|[[Sketcher_ToggleConstruction|Toggle construction geometry]] |
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|[[Sketcher_ConstrainPointOnObject|Point on object]] |
|[[Sketcher_ConstrainPointOnObject|Point on object]] |
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|Shortcut={{KEY|C}} |
|Shortcut={{KEY|C}} |
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|SeeAlso=[[ |
|SeeAlso=[[Sketcher_ConstrainCoincidentUnified|Sketcher ConstrainCoincidentUnified]], [[Sketcher_ConstrainPointOnObject|Sketcher ConstrainPointOnObject]] |
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==Description== <!--T:40--> |
==Description== <!--T:40--> |
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Affixes a point onto (coincident with) one or more other points. It acts as a concentric constraint if two or more circles, arcs, ellipses or arcs of ellipses are selected. |
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The [[Image:Sketcher_ConstrainCoincident.svg|24px]] [[Sketcher_ConstrainCoincident|Sketcher ConstrainCoincident]] tool creates a coincident constraint between points, or ({{Version|0.21}}) a concentric constraint between circles, arcs and/or ellipses (by making their centers coincident). |
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{{Version|0.22}}: This tool is replaced by the [[Sketcher_ConstrainCoincidentUnified|Sketcher ConstrainCoincidentUnified]] tool if the '''Unify Coincident and PointOnObject''' option is selected in the [[Sketcher_Preferences#General|Sketcher Preferences]]. |
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==Usage== <!--T:41--> |
==Usage== <!--T:41--> |
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See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]]. |
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===[[Sketcher_Workbench#Continue_modes|Continue mode]]=== |
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# Make sure there is no selection. |
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⚫ | |||
⚫ | |||
⚫ | |||
#* Use the keyboard shortcut: {{KEY|C}}. |
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# The cursor changes to a white cross with the tool icon. |
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# Do one of the following: |
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#* Select two points. |
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#* Select two edges of circles, arcs, ellipses or arcs of ellipses. |
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# A constraint is added. |
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# Optionally keep creating constraints. |
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# To finish, right-click or press {{KEY|Esc}}, or start another geometry or constraint creation tool. |
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===Run-once mode=== |
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# Do one of the following: |
# Do one of the following: |
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#* Select two or more points. |
#* Select two or more points. |
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#* Select two or more edges of circles, arcs, ellipses or arcs of ellipses. |
#* Select two or more edges of circles, arcs, ellipses or arcs of ellipses. |
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# Invoke the tool as explained above. |
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⚫ | |||
# Depending on the selection one or more constraints are added. |
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⚫ | |||
#* Use the {{KEY|C}} keyboard shortcut. |
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==Notes== |
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* {{Version|0.22}}: Points with Coincident constraints are marked with the '''Constraint symbols''' [[Sketcher_Preferences#Display|color]]. |
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== Alternatives to Coincident constraint == <!--T:42--> |
== Alternatives to Coincident constraint == <!--T:42--> |
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Some combinations which are not possible with a coincident constraint can be emulated using other constraints: |
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* The [[File:Sketcher_ConstrainSymmetric.svg| |
* The [[File:Sketcher_ConstrainSymmetric.svg|16px]] [[Sketcher_ConstrainSymmetric|Symmetric constraint]] can be used to place a point on the midpoint of a straight line. |
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* A midpoint-to-midpoint placement of two straight lines can be achieved by creating a new [[File:Sketcher_CreatePoint.svg| |
* A midpoint-to-midpoint placement of two straight lines can be achieved by creating a new [[File:Sketcher_CreatePoint.svg|16px]] [[Sketcher_CreatePoint|Point]] and using two [[File:Sketcher_ConstrainSymmetric.svg|16px]] [[Sketcher_ConstrainSymmetric|Symmetric constraints]] so that it lies on the midpoint of both lines. |
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* A vertex can be constrained to lie along an edge using a [[File:Sketcher_ConstrainPointOnObject.svg| |
* A vertex can be constrained to lie along an edge using a [[File:Sketcher_ConstrainPointOnObject.svg|16px]] [[Sketcher_ConstrainPointOnObject|Point on object]] constraint. Note that with this constraint, the point can lie anywhere on the full extension of a segment or curve (i.e. also before the start point or beyond the end point). |
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* A collinear placement of two straight lines can be obtained by applying a [[File:Sketcher_ConstrainTangent.svg| |
* A collinear placement of two straight lines can be obtained by applying a [[File:Sketcher_ConstrainTangent.svg|16px]] [[Sketcher_ConstrainTangent|Tangent constraint]] to them, or by combining a [[File:Sketcher_ConstrainPointOnObject.svg|16px]] [[Sketcher_ConstrainPointOnObject|Point on object constraint]] and a [[File:Sketcher_ConstrainParallel.svg|16px]] [[Sketcher_ConstrainParallel|Parallel constraint]]. |
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* Two edges can be made identical by using two [[File:Sketcher_ConstrainCoincident.svg|24px]] [[Sketcher_ConstrainCoincident|Coincident]] constraints, one for each pair of extremities. |
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* Two circles can be made identical by using a [[File:Sketcher_ConstrainCoincident.svg|24px]] [[Sketcher_ConstrainCoincident|Coincident]] constraint to merge the centers, and applying an [[File:Sketcher_ConstrainEqual.svg|24px]] [[Sketcher_ConstrainEqual|Equal]] constraint to their edges. For arcs, this will ensure both arcs are part of the same circle, while allowing them to have different start and end points. |
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==Scripting== <!--T:14--> |
==Scripting== <!--T:14--> |
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|[[Sketcher_ConstrainCoincidentUnified|Coincident (unified)]] |
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|[[Sketcher_ToggleConstruction|Toggle construction geometry]] |
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|[[Sketcher_ConstrainPointOnObject|Point on object]] |
|[[Sketcher_ConstrainPointOnObject|Point on object]] |
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|[[Sketcher_Workbench|Sketcher]] |
|[[Sketcher_Workbench|Sketcher]] |
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|IconL=Sketcher_ConstrainCoincidentUnified.svg |
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|IconR=Constraint_PointOnObject.svg |
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Latest revision as of 15:24, 11 April 2024
Sketcher ConstrainCoincident |
Menu location |
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Sketch → Sketcher constraints → Constrain coincident |
Workbenches |
Sketcher |
Default shortcut |
C |
Introduced in version |
- |
See also |
Sketcher ConstrainCoincidentUnified, Sketcher ConstrainPointOnObject |
Description
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 0.22: This tool is replaced by the Sketcher ConstrainCoincidentUnified tool if the Unify Coincident and PointOnObject option is selected in the Sketcher Preferences.
Usage
See also: Drawing aids.
Continue mode
- Make sure there is no selection.
- 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.
- The cursor changes to a white cross with the tool icon.
- Do one of the following:
- Select two points.
- Select two edges of circles, arcs, ellipses or arcs of ellipses.
- A constraint is added.
- Optionally keep creating constraints.
- To finish, right-click or press Esc, or start another geometry or constraint creation tool.
Run-once mode
- Do one of the following:
- Select two or more points.
- Select two or more edges of circles, arcs, ellipses or arcs of ellipses.
- Invoke the tool as explained above.
- Depending on the selection one or more constraints are added.
Notes
- introduced in version 0.22: Points with Coincident constraints are marked with the Constraint symbols color.
Alternatives to Coincident constraint
Some combinations which are not possible with a coincident constraint can be emulated using other constraints:
- The Symmetric constraint can be used to place a point on the midpoint of a straight line.
- A midpoint-to-midpoint placement of two straight lines can be achieved by creating a new Point and using two Symmetric constraints so that it lies on the midpoint of both lines.
- A vertex can be constrained to lie along an edge using a Point on object constraint. Note that with this constraint, the point can lie anywhere on the full extension of a segment or curve (i.e. also before the start point or beyond the end point).
- A collinear placement of two straight lines can be obtained by applying a Tangent constraint to them, or by combining a Point on object constraint and a Parallel constraint.
Scripting
The constraint can be created from macros and from the Python console by using the following command:
Sketch.addConstraint(Sketcher.Constraint('Coincident',LineFixed,PointOfLineFixed,LineMoving,PointOfLineMoving))
where :
Sketch
is a sketch objectLineFixed
is the number of the line, that will not move by applying the constraintPointOfLineFixed
indicates which vertex ofLineFixed
has to fulfill the constraintLineMoving
is the number of the line, that will move by applying the constraintPointOfLineMoving
indicates which vertex ofLineMoving
has to fulfill the constraint
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.
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