Center Selected Sketch Contents

[duckmug]

I am able to center a solid to the true origin with this macro:

Code: Select all

obj = FreeCADGui.Selection.getSelection()[0]
shp = obj.Shape
center = shp.BoundBox.Center

m = FreeCAD.Matrix()
m.move(center * -1)
movedShape = shp.transformGeometry(m)

new_obj = App.ActiveDocument.addObject('Part::Feature', obj.Name)
new_obj.Shape = movedShape

Is there something similar that I can apply for the selected contents of a sketch?

Using the GUI sketch move tool does not center it to the origin but rather makes it start from it.

It may not seem essential to do this kind of manual centering since a constraint would assist anyway but it would ease a number of cases.

[chrisb]

Watching the forum is an endless source of things to learn, e.g.: https://forum.freecadweb.org/viewtopic. ... 97#p510397 .

[duckmug]

Indeed. That's neat but it seems to center the camera rather than the selected sketch contents around the origin.

At least that's the effect that I can reproduce here.

[chrisb]

Oh sorry, I messed things up, you asked for a sketch. In general this is not possible, you have to add appropriate constraints, e.g. symmetry. Better help is possible if you can give a concrete case.

[Syres]

Is there something similar that I can apply for the selected contents of a sketch?

Using the GUI sketch move tool does not center it to the origin but rather makes it start from it.

Using @edwilliams16 code as a base, is this what you are looking for (it only centres the entire sketch on the origin not specific geometry):

Code: Select all

import FreeCAD
selt = Gui.Selection.getSelectionEx()
sel = selt[0]
if sel.Object.Shape.ShapeType == 'Compound':
    shift = sel.Object.Shape.SubShapes[0].CenterOfMass
base = App.ActiveDocument.getObject(sel.ObjectName).Placement
base.move(-shift)
App.ActiveDocument.recompute()

[duckmug]

Is there something similar that I can apply for the selected contents of a sketch?

Using the GUI sketch move tool does not center it to the origin but rather makes it start from it.

Using @edwilliams16 code as a base, is this what you are looking for (it only centres the entire sketch on the origin not specific geometry):

Code: Select all

import FreeCAD
selt = Gui.Selection.getSelectionEx()
sel = selt[0]
if sel.Object.Shape.ShapeType == 'Compound':
    shift = sel.Object.Shape.SubShapes[0].CenterOfMass
base = App.ActiveDocument.getObject(sel.ObjectName).Placement
base.move(-shift)
App.ActiveDocument.recompute()

Hi, thank you for your response.

What I am looking for is for centering sketch contents in sketch edit, not the sketch itself.

[chrisb]

What I am looking for is for centering sketch contents in sketch edit, not the sketch itself.

View->Standard Views->FitAll or the corresponding icon center the sketch. Sometimes it is a bit surprising because the center is always included.

[drmacro]

What I am looking for is for centering sketch contents in sketch edit, not the sketch itself.

How about when in Sketch edit mode:
https://wiki.freecadweb.org/Sketcher_ViewSketch

[duckmug]

I meant moving the selected sketch contents so that they are centered around the sketch origin.

As chrisb said though:

In general this is not possible, you have to add appropriate constraints, e.g. symmetry.

[duckmug]

I figured that I can solve this by simply moving the shape prior to converting to sketch.