Sketcher ConstrainCoincident/cs: Difference between revisions
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{{Docnav |
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|[[Sketcher_ConstrainCoincidentUnified|Coincident (unified)]] |
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|[[Sketcher_ToggleConstruction|Construction Mode]] |
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|[[Sketcher_ConstrainPointOnObject|Point |
|[[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 |
|IconR=Constraint_PointOnObject.svg |
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==Description== |
==Description== |
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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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<div class="mw-translate-fuzzy"> |
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Vytváří vazbu totožnosti na vybrané položce. |
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{{Version|1.0}}: 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|preferences]]. |
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Tento vazbový nástroj vezme dva body jako své argumenty a slouží k tomu, že je udělá ''totožné''. (Znamená to, že je udělá jako-jeden-bod). |
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V praxi je tento nástroj užitečný když je např. mezera mezi dvěma koncovými body přímek, které mají být spojeny - vazba totožnosti na jejich koncové body tuto mezeru uzavře. |
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See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]]. |
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==Usage== |
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===[[Sketcher_Workbench#Continue_modes|Continue mode]]=== |
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<div class="mw-translate-fuzzy"> |
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====Použití==== |
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# Make sure there is no selection. |
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Jak je uvedeno výše, tento nástroj přijímá dva argumenty - oba jsou to body. |
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# There are several ways to invoke the tool: |
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#Nejdříve je nutné vysvítit dva různé body. (Připomínám, že to nebude fungovat jestli se např. pokusíte vybrat počáteční a koncový bod jedné přímky). |
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#* Press the {{Button|[[Image:Sketcher_ConstrainCoincident.svg|16px]] [[Sketcher_ConstrainCoincident|Constrain coincident]]}} button. |
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#Vysvícení nakreslených položek dosáhnete posunem myši nad položku a kliknutím levým tlačítkem myši. |
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#* Select the {{MenuCommand|Sketch → Sketcher constraints → [[Image:Sketcher_ConstrainCoincident.svg|16px]] Constrain coincident}} option from the menu. |
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#Vysvícená položka změní barvu na zelenou. |
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#* Use the keyboard shortcut: {{KEY|C}}. |
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#následující položky mohou být vysvíceny opakováním výše uvedeného postupu POZNÁMKA: není potřeba zároveň držet stisknutou nějakou další klávesu, jako např. CTRL, abychom dosáhli vícenásobného výběru položek na výkrese. |
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# The cursor changes to a cross with the tool icon. |
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#Jakmile máte vybrány dva body, kliknutím levým tlačítkem myši na vazbu 'BodNaBod' zajistí, že se body stanou ''totožné'' a jsou nahrazeny jedním bodem. |
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# Do one of the following: |
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POZNÁMKA: Kvůli nastavení totožnosti bodů, musí FreeCAD nutně posunout jeden nebo oba původní body. |
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#* Select two points. |
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</div> |
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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: |
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{{Emphasis|Note:}} In order to make two points coincident, FreeCAD must out of necessity move one (or both) of the original points. |
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#* Select two or more points. |
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#* 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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==Notes== |
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== Alternatives to Coincident constraint == |
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* {{Version|1.0}}: Points with Coincident constraints are marked with the '''Constraint symbols''' [[Sketcher_Preferences#Display|color]]. |
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The two constrained items of a [[Sketcher ConstrainCoincident|Coincident]] constraint must be start point or end point vertices, or center points of arcs, circles or ellipses. 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|24px]] [[Sketcher ConstrainSymmetric|Symmetric]] constraint can be used to place a start point, end point or center 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|24px]] [[Sketcher CreatePoint|Point]] and using two [[File:Sketcher_ConstrainSymmetric.svg|24px]] [[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|24px]][[Sketcher ConstrainPointOnObject|PointOnObject]] 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|24px]] [[Sketcher ConstrainTangent|Tangent]] constraint to them, or by combining a [[File:Sketcher_ConstrainPointOnObject.svg|24px]] [[Sketcher ConstrainPointOnObject|PointOnObject]] constraint and a [[File:Sketcher_ConstrainParallel.svg|24px]] [[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== |
==Scripting== |
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The constraint can be created from macros and from the |
The constraint can be created from [[Macros|macros]] and from the [[Python|Python]] console by using the following command: |
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{{Code|code=Sketch.addConstraint(Sketcher.Constraint('Coincident',LineFixed,PointOfLineFixed,LineMoving,PointOfLineMoving)) }} |
{{Code|code=Sketch.addConstraint(Sketcher.Constraint('Coincident',LineFixed,PointOfLineFixed,LineMoving,PointOfLineMoving)) }} |
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Latest revision as of 14:50, 23 April 2024
Constraint PointOnPoint |
Umístění Menu |
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Sketch → Sketcher constraints → Constrain coincident |
Pracovní stoly |
Náčrt |
Výchozí zástupce |
C |
Představen ve verzi |
- |
Viz také |
Constraint Lock, Vazba Bod na objekt |
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 1.0: This tool is replaced by the Sketcher ConstrainCoincidentUnified tool if the Unify Coincident and PointOnObject option is selected in the 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 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 1.0: Points with Coincident constraints are marked with the Constraint symbols color.
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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