TechDraw LinkDimension: Difference between revisions

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{{Docnav
{{Docnav|[[TechDraw_Dimension_Angle3Pt|New Angle3Pt]]|[[TechDraw_Balloon|New Ballon]]|[[TechDraw_Module|TechDraw]]|IconL=TechDraw_Dimension_Angle3Pt.png|IconC=Workbench_TechDraw.svg|IconR=TechDraw Balloon.svg}}
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|MenuLocation=TechDraw → Dimension Link
|MenuLocation=TechDraw → Dimension Link
|Workbenches=[[TechDraw Module|TechDraw]]
|Workbenches=[[TechDraw Module|TechDraw]]
|SeeAlso=[[TechDraw NewView]], [[TechDraw NewProjGroup]]
|SeeAlso=[[TechDraw NewView|TechDraw NewView]], [[TechDraw NewProjGroup|TechDraw NewProjGroup]]
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The Dimension Link tool creates a link between 3D geometry and 1 or more Dimensions on a Page. This link allows the Dimension to use actual 3D values instead of 2D projected values.
The Dimension Link tool creates a link between 3D geometry and 1 or more existing projected Dimensions on a Page. This link allows the Dimension to use actual 3D values instead of 2D projected values.

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The Dimension Link tool's most common use is in dimensioning isometric views in a ProjectionGroup. The projected length of an Edge in an isometric view will, of course, not necessarily equal the actual length of the Edge. In an orthogonal view the projected and actual lengths will be equal.

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The Dimension Link instructs the Dimension to compute it's value directly from the 3D geometry.


==How to use== <!--T:3-->
==How to use== <!--T:3-->


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# Create an appropriate dimension on the drawing page using any of [[TechDraw_Dimension_Length|Dimension Length]], [[TechDraw_Dimension_Horizontal|Dimension Horizontal]], etc. This dimension will be in the right place on the Page, but will show the projected dimension value.
# Create your dimension on the drawing page as usual.
# Select the geometry in the 3D view, for example, an edge, that corresponds to one of your dimensions.
# Select the geometry in the 3D view, for example, an edge, that corresponds to the projected geometry of your dimension.
# Press the {{Button|[[Image:TechDraw_Dimension_Link.svg|16px]] [[TechDraw Dimension Link|Dimension Link]]}} button.
# Press the {{Button|[[Image:TechDraw_Dimension_Link.svg|16px]] [[TechDraw Dimension Link|Dimension Link]]}} button.
# A dialog will open. Select one or more Dimensions to be linked to the selected 3D geometry.
# A dialog will open. Select one or more Dimensions to be linked to the selected 3D geometry.
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Dimension objects are vulnerable to "topological naming" issues. See the information in the [[TechDraw Dimension Length]] tool for more information. It is recommended that linking dimensions be one of the last steps in your drawing process.
Dimension objects are vulnerable to "topological naming" issues. See the information in the [[TechDraw Dimension Length|TechDraw Dimension Length]] tool for more information. It is recommended that linking dimensions be one of the last steps in your drawing process.


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{{Emphasis|See also:}} [[TechDraw API]] and [[FreeCAD Scripting Basics]].
{{Emphasis|See also:}} [[TechDraw API|TechDraw API]] and [[FreeCAD Scripting Basics|FreeCAD Scripting Basics]].


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The Dimension Link tool can be used in [[macros]] and from the [[Python]] console by using the following functions:
The Dimension Link tool can be used in [[macros|macros]] and from the [[Python|Python]] console by using the following functions:


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{{Docnav|[[TechDraw_Dimension_Angle3Pt|New Angle3Pt]]|[[TechDraw_Balloon|New Ballon]]|[[TechDraw_Module|TechDraw]]|IconL=TechDraw_Dimension_Angle3Pt.png|IconC=Workbench_TechDraw.svg|IconR=TechDraw Balloon.svg}}
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Revision as of 21:33, 2 January 2020

TechDraw Dimension Link

Menu location
TechDraw → Dimension Link
Workbenches
TechDraw
Default shortcut
None
Introduced in version
-
See also
TechDraw NewView, TechDraw NewProjGroup

Description

The Dimension Link tool creates a link between 3D geometry and 1 or more existing projected Dimensions on a Page. This link allows the Dimension to use actual 3D values instead of 2D projected values.

The Dimension Link tool's most common use is in dimensioning isometric views in a ProjectionGroup. The projected length of an Edge in an isometric view will, of course, not necessarily equal the actual length of the Edge. In an orthogonal view the projected and actual lengths will be equal.

The Dimension Link instructs the Dimension to compute it's value directly from the 3D geometry.

How to use

  1. Create an appropriate dimension on the drawing page using any of Dimension Length, Dimension Horizontal, etc. This dimension will be in the right place on the Page, but will show the projected dimension value.
  2. Select the geometry in the 3D view, for example, an edge, that corresponds to the projected geometry of your dimension.
  3. Press the Dimension Link button.
  4. A dialog will open. Select one or more Dimensions to be linked to the selected 3D geometry.
  5. Press OK.

After the link operation is completed the DataMeasureType property of the dimension changes from Projected to True.

Limitations

Dimension objects are vulnerable to "topological naming" issues. See the information in the TechDraw Dimension Length tool for more information. It is recommended that linking dimensions be one of the last steps in your drawing process.

The link tool will not stop you from making illogical links, so you need to choose the correct edge from the 3D view when creating the link.

There is currently no way to break a link; you can change the DataMeasureType back to Projected so that the dimension will use the projected value instead of the linked value.

Note that if the Dimension to be linked is based on two vertices, you should select two vertices in the 3D view. Similarly if the Dimension is based on an edge, you should select an edge in the 3D view.

Properties

  1. The MeasureType property of a linked Dimension will be changed from "Projected" to "True".

Scripting

See also: TechDraw API and FreeCAD Scripting Basics.

The Dimension Link tool can be used in macros and from the Python console by using the following functions:

to be defined