TechDraw HorizontalExtentDimension

From FreeCAD Documentation

TechDraw HorizontalExtentDimension

Menu location
TechDraw → Dimensions → Insert Horizontal Extent Dimension
Default shortcut
Introduced in version
See also
TechDraw LengthDimension, TechDraw VerticalExtentDimension


The TechDraw HorizontalExtentDimension tool adds a linear dimension to a View. The dimension extends from the left most point on the selected objects to the right most point.

Horizontal and vertical extent dimensions of a B-spline


  1. Select a View or a collection of Edges in a View.
  2. There are several ways to invoke the tool:
  3. A dimension is added to the View.
  4. The dimension may be dragged to the desired position.
  5. If needed, add tolerances as described on this page.

Change properties

To change the properties of a dimension object either double-click it in the drawing or in the Tree view. This will open the Dimension dialog.


Dimension objects are vulnerable to the "topological naming problem". See TechDraw LengthDimension.


See TechDraw LengthDimension.


See TechDraw LengthDimension. Exceptions noted below.



  • DataMeasure Type (Enumeration): Not yet implemented for extent dimensions.


See also: Autogenerated API documentation and FreeCAD Scripting Basics.

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

selection = ['Edge1', 'Edge2']                      # or [] for all

TechDraw.makeExtentDim(view1, selection, 0)         # view1 is a DrawViewPart; 0 for horizontal
App.ActiveDocument.DimExtent.Y = -60                # offset dimension line from dimensioned edges in Y direction
App.ActiveDocument.DimExtent.X = 10                 # offset dimension text along dimension line in X direction
App.ActiveDocument.DimExtent.FormatSpec = '%.0f'    # Dimension format

TechDraw.makeExtentDim(view1, selection, 1)         # view1 is a DrawViewPart; 1 for vertical
App.ActiveDocument.DimExtent001.X = -130            # offset dimension line from dimensioned edges in X direction
App.ActiveDocument.DimExtent001.Y = 10              # offset dimension text along dimension line in Y direction
App.ActiveDocument.DimExtent001.FormatSpec = '%.0f'

# Note the dimension names are 'DimExtent', 'DimExtent001' etc in the order created.