TechDraw GeometricHatch

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TechDraw GeometricHatch.svg TechDraw GeometricHatch

Menu location
TechDraw → Apply Geometric Hatch to Face
Workbenches
TechDraw
Default shortcut
None
Introduced in version
-
See also
TechDraw Hatch, TechDraw Hatching

Description

The TechDraw GeometricHatch.svg TechDraw GeometricHatch tool fills a closed region in a View with a pattern based on an AutoDesk PAT hatching specification. Alternatively the TechDraw Hatch.svg TechDraw Hatch tool uses SVG based hatch patterns. See Hatching for details.

TechDraw GeomHatch example.png

Geometric hatch pattern on a face

Usage

  1. Select a closed region in a View.
  2. There are several ways to invoke the tool:
    • Press the TechDraw GeometricHatch.svg TechDraw GeometricHatch button.
    • Select the TechDraw → TechDraw GeometricHatch.svg Apply Geometric Hatch to Face option from the menu.
  3. The Apply Geometric Hatch to Face task panel opens.
  4. Optionally change the Pattern File, the Pattern Name, the Pattern Scale, the Line Weight and the Line Color.
  5. Press the OK button.

Notes

A small set of sample patterns are available in:

$INSTALL_DIR/data/Mod/TechDraw/PAT/FCPAT.pat

$INSTALL_DIR is the directory where FreeCAD was installed, for example

/usr/share/freecad/data/Mod/TechDraw/PAT/FCPAT.pat

Properties

  • DataSource: The View and Face to receive the hatch pattern.
  • DataFile Pattern: The location of the PAT file to use.
  • DataName Pattern: The name of the PAT specification within File Pattern.
  • DataScale Pattern: The scale to be applied to the pattern (must be > 0.0).
  • ViewWeight Pattern: The thickness of the pattern lines.
  • ViewColor Pattern: The color for the pattern lines.

Scripting

See also: TechDraw API and FreeCAD Scripting Basics.

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

hatch = FreeCAD.ActiveDocument.addObject('TechDraw::DrawGeomHatch','GeomHatch')
hatch.Source = (view1,["Face0"])
hatch.FilePattern = "path/to/myPATfile.pat"
hatch.NamePattern = "Diamond"
rc = page.addView(hatch)

It is also possible to use TechDraw's geometric hatch engine to produce a compound object in the 3D space. One must take care that the base face lies on the XY plane, as the algorithm is not tailored yet for other cases:

import TechDraw
face = Part.makePlane(10,10)
patfile = "path/to/myPATfile.pat"
pattern = "Diamond"
scale = 10
hatch = TechDraw.makeGeomHatch(face, scale, pattern, patfile)
Part.show(hatch)


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