TechDraw LandmarkDimension: Difference between revisions

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{{GuiCommand
{{GuiCommand
|Name=TechDraw Dimension Landmark
|Name=TechDraw LandmarkDimension
|MenuLocation=TechDraw → Dimensions → Insert Landmark Dimension
|MenuLocation=TechDraw → Dimensions → Insert Landmark Dimension
|Workbenches=[[TechDraw_Workbench|TechDraw]]
|Workbenches=[[TechDraw_Workbench|TechDraw]]
|Version=0.19
|Version=0.19
|SeeAlso=[[TechDraw_Dimension_Horizontal|TechDraw Dimension Horizontal]], [[TechDraw_Dimension_Vertical|TechDraw Dimension Vertical]]
|SeeAlso=[[TechDraw_HorizontalDimension|TechDraw HorizontalDimension]], [[TechDraw_VerticalDimension|TechDraw VerticalDimension]]
}}
}}


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The Dimension Landmark tool adds a linear dimension to a View. The dimension is based on two Point {{Emphasis|feature}} (Draft.Point or Part.Vertex) from the 3D model. Note that the points must be {{Emphasis|feature}} objects that appear in the model [[Tree_view|tree view]]. Random vertexes from a shape will not work.
The Landmark Dimension tool adds a linear dimension to a View. The dimension is based on two Point {{Emphasis|feature}} (Draft.Point or Part.Vertex) from the 3D model. Note that the points must be {{Emphasis|feature}} objects that appear in the model [[Tree_view|tree view]]. Random vertexes from a shape will not work.


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See the Limitation and WorkAround sections of [[TechDraw_Dimension_Length|TechDraw Dimension Length]] for more on dimensions and topological naming.
See [[TechDraw_LengthDimension#Limitation|TechDraw LengthDimension]] for more on dimensions and topological naming.


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The Landmark Dimension generally behaves like any other Dimension
The Landmark Dimension generally behaves like any other Dimension.

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==Usage== <!--T:3-->
==Usage== <!--T:3-->
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# Select 2 Point objects in the [[Tree_view|tree view]] or the [[3D_view|3D view]].
# Select 2 Point objects in the [[Tree_view|tree view]] or the [[3D_view|3D view]].
# Select also the View to which the dimension is to be added.
# Select also the View to which the dimension is to be added.
# Press the {{Button|[[Image:Techdraw-landmarkdistance.svg|20px]] [[TechDraw_Dimension_Landmark|Dimension Landmark]]}} button or {{MenuCommand|TechDraw → Dimension Landmark}}
# Press the {{Button|[[Image:TechDraw_LandmarkDimension.svg|16px]] [[TechDraw_LandmarkDimension|Landmark Dimension]]}} button or {{MenuCommand|TechDraw → Insert Landmark Dimension}}
# A dimension will be added to the View. The dimension text may be dragged to the desired position.
# A dimension will be added to the View. The dimension text may be dragged to the desired position.


== Limitations == <!--T:7-->
== Limitations == <!--T:7-->
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The Dimension Landmark tool can be used in [[Macros|macros]] and from the [[Python|Python]] console by using the following functions:
The Landmark Dimension tool can be used in [[Macros|macros]] and from the [[Python|Python]] console by using the following functions:


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Revision as of 18:36, 15 September 2021

TechDraw LandmarkDimension

Menu location
TechDraw → Dimensions → Insert Landmark Dimension
Workbenches
TechDraw
Default shortcut
None
Introduced in version
0.19
See also
TechDraw HorizontalDimension, TechDraw VerticalDimension

Description

The Landmark Dimension tool adds a linear dimension to a View. The dimension is based on two Point feature (Draft.Point or Part.Vertex) from the 3D model. Note that the points must be feature objects that appear in the model tree view. Random vertexes from a shape will not work.

The purpose of this tool is to provide a workaround to the corruption of dimension caused by "topological naming" issues. The source points should use Expressions or other containing mechanism to establish their position. Since the points are Document Objects, and not shape components, their name does not change with recomputes, and hence they are easily found.

See TechDraw LengthDimension for more on dimensions and topological naming.

The Landmark Dimension generally behaves like any other Dimension.

Usage

  1. Select 2 Point objects in the tree view or the 3D view.
  2. Select also the View to which the dimension is to be added.
  3. Press the Landmark Dimension button or TechDraw → Insert Landmark Dimension
  4. A dimension will be added to the View. The dimension text may be dragged to the desired position.

Limitations

The Landmark Dimension tool is initially limited to "Distance" dimensions. Other types may be added if demand warrants.

Properties

Landmark Dimension does not introduce any new properties.

Scripting

See also: TechDraw API and FreeCAD Scripting Basics.

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

dim1 = FreeCAD.ActiveDocument.addObject('TechDraw::LandmarkDimension','Landmark')
dim1.Type = "Distance"
dim1.References2D=[(TDView, 'Vertex1')]
dim1.References3D=[(Point3d1, 'Vertex1')]
dim1.References3D=[(Point3d2, 'Vertex1')]
rc = page.addView(dim1)