TechDraw: export View to DXF

[wandererfan]

TechDraw.viewPartAsDxf if invoked for the simple ellipse I'm attaching, will produce a wrong output

It looks like the specification of an Ellipse may vary depending on Dxf version. Haven't understood all the details yet.

it seems the issues I have with TechDraw.viewPartAsDxf are BSpline related...

Wasn't there an issues with BSpline in Drawing::DXFOut recently?

[easyw-fc]

c if invoked for the simple ellipse I'm attaching, will produce a wrong output

It looks like the specification of an Ellipse may vary depending on Dxf version. Haven't understood all the details yet.

just for information, TechDraw.viewPartAsSvg is working fine

it seems the issues I have with TechDraw.viewPartAsDxf are BSpline related...

Wasn't there an issues with BSpline in Drawing::DXFOut recently?

would you mind to point this issue? I've searched at the forum but I haven't found anything...

Moreover the TechDraw.viewPartAsSvg is failing in the same way, but the TechDraw Menu Export as SVG is doing the conversion correctly
Are there two different methods to obtain the output?

Thx again
Maurice

[wandererfan]

if invoked for the simple ellipse I'm attaching, will produce a wrong output

Some progress on ellipse. Here is your ellipse in LibreCad.

easyw-fc_ellipse.png (30.47 KiB) Viewed 1807 times

Note the fussy little changes to the fcOut.dxf file required to make it work! Biggest one is typo, sb ENDSEC not ENDSECT.

fcOut_ellipse.dxf

(181 Bytes) Downloaded 55 times

it seems the issues I have with TechDraw.viewPartAsDxf are BSpline related...
would you mind to point this issue? I've searched at the forum but I haven't found anything...

Not as recent as I thought: git commit a32972ef2f

Moreover the TechDraw.viewPartAsSvg is failing in the same way, but the TechDraw Menu Export as SVG is doing the conversion correctly
Are there two different methods to obtain the output?

Yes. The Menu/Gui "Export As Svg" uses a Qt routine to translate what Qt is showing on the screen into SVG. viewPartAsSvg/Dxf use SVGOutput and DXFOutput routines from the Drawing module to translate OCC edges. These 2 routines are very similar except for the actual writing of Svg vs Dxf text.

I'll look into BSplines now.

[wandererfan]

it seems the issues I have with TechDraw.viewPartAsDxf are BSpline related...
Here two files where the dxf export is failing with bsplines (the dxf is the result of a direct export without the shifting)

I don't have any problem exporting views from either file:

pallier_front.png (18.45 KiB) Viewed 1796 times

pallier_top.png (15.68 KiB) Viewed 1796 times

pallier_front2.png (130.39 KiB) Viewed 1796 times

Different LibreCAD?

LibreCAD_about.png (66.78 KiB) Viewed 1796 times

Different OCC?
OS: Linux Mint 18.3 Sylvia
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.13397 +1 (Git)
Build type: debug
Branch: edge2edgeDim
Hash: c02ddba1fbc31eeb442c6c71b05b4f244c2f1a0c
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: English/Canada (en_CA)

[easyw-fc]

it seems the issues I have with TechDraw.viewPartAsDxf are BSpline related...
Here two files where the dxf export is failing with bsplines (the dxf is the result of a direct export without the shifting)

I don't have any problem exporting views from either file:
pallier_front.png
pallier_top.png
pallier_front2.png

Different LibreCAD?
LibreCAD_about.png

Good catch!
Yes, LibreCAD 2.13 compared to LCAD 2.09
I'm viewing the file like you in LibreCAD 2.0.9 in Windows...

I'm going to test it a bit deeper ... Thanks

[easyw-fc]

I don't have any problem exporting views from either file:

Hi @wanderfan,
is there a way to obtain a list of TechDraw edges projected onto the page using python?
I was thinking to send them to the DXF FC exporter to test the result...

Code: Select all

importDXF.export(__objs__,u"c:/Temp/TD-test.dxf")

Thx
Maurice

[wandererfan]

edit2: this depends on a modified version of viewPartAsDxf()

Some progress:

PageInFC.png (31.72 KiB) Viewed 1767 times

PageInLC.png (12.76 KiB) Viewed 1767 times

Edit: forgot the script:

Code: Select all

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# export an entire Page of DrawViewParts as Dxf

import FreeCAD
import TechDraw

fileSpecDxf = "fcPageOut.dxf"
s = FreeCADGui.Selection.getSelection()
myObj = s[0]
print myObj.Name," / ", myObj.TypeId
dxfStart = "0\nSECTION\n2\nENTITIES\n"
dxfEnd = "0\nENDSEC\n0\nEOF\n"
if (myObj.isDerivedFrom("TechDraw::DrawPage")):
    p = myObj
    pv = myObj.Views
    s = ""
    for v in pv:
        if v.isDerivedFrom("TechDraw::DrawViewPart"):
            s += TechDraw.viewPartAsDxf(v)
        if v.isDerivedFrom("TechDraw::DrawProjGroup"):
            for vv in v.Views:
                if vv.isDerivedFrom("TechDraw::DrawViewPart"):
                    s += TechDraw.viewPartAsDxf(vv)

    dxfFile = open(fileSpecDxf, "w")
    dxfFile.write(dxfStart)
    dxfFile.write(s)
    dxfFile.write(dxfEnd)
    dxfFile.close()
else:
    print("wrong selection")

print "exportPage.py finished"

[wandererfan]

is there a way to obtain a list of TechDraw edges projected onto the page using python?
I was thinking to send them to the DXF FC exporter to test the result...

Code: Select all

importDXF.export(__objs__,u"c:/Temp/TD-test.dxf")

I'll have to think about that one. Nothing jumps out at me. The edges are all stored in the View, but I don't think there is a Python method to access them directly.

[wandererfan]

is there a way to obtain a list of TechDraw edges projected onto the page using python?
I was thinking to send them to the DXF FC exporter to test the result...

Code: Select all

importDXF.export(__objs__,u"c:/Temp/TD-test.dxf")

As soon as I can figure out what form "__objs__" takes (OCC edge, FC edge, Draft wire, ...), I can build a version of FC where DrawViewPart has a method like "getEdges". But I don't think I can move it to master until 0.17 release shakes out.

I'll build it and act as your service bureau if you have tests to run.

[easyw-fc]

As soon as I can figure out what form "__objs__" takes (OCC edge, FC edge, Draft wire, ...), I can build a version of FC where DrawViewPart has a method like "getEdges".

here a sample code to export a projection of shapes

Code: Select all

App.newDocument("Unnamed")
App.setActiveDocument("Unnamed")
App.ActiveDocument=App.getDocument("Unnamed")
Gui.ActiveDocument=Gui.getDocument("Unnamed")
App.ActiveDocument.addObject("Part::Torus","Torus")
App.ActiveDocument.ActiveObject.Label = "Torus"
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")
Gui.activeDocument().activeView().viewTop()
o = App.ActiveDocument.ActiveObject
vec = FreeCADGui.ActiveDocument.ActiveView.getViewDirection().negative()
import Draft
Draft.makeShape2DView(o,vec)
Gui.getDocument("Unnamed").getObject("Torus").Visibility=False
__objs__=[]
__objs__.append(FreeCAD.getDocument("Unnamed").getObject("Shape2DView"))
import importDXF
importDXF.export(__objs__,u"C:/Temp/Shape2DView.dxf")

del __objs__

Is this what you needed?
Please let me know if I may give more testing case

Code: Select all

App.newDocument("Unnamed")
App.setActiveDocument("Unnamed")
App.ActiveDocument=App.getDocument("Unnamed")
Gui.ActiveDocument=Gui.getDocument("Unnamed")
App.setActiveDocument("Unnamed")
App.ActiveDocument=App.getDocument("Unnamed")
Gui.ActiveDocument=Gui.getDocument("Unnamed")
App.ActiveDocument.addObject("Part::Torus","Torus")
App.ActiveDocument.ActiveObject.Label = "Torus"
App.ActiveDocument.recompute()
Gui.SendMsgToActiveView("ViewFit")
Gui.activeDocument().activeView().viewTop()
o = App.ActiveDocument.ActiveObject
vec = FreeCADGui.ActiveDocument.ActiveView.getViewDirection().negative()
import Draft
Draft.makeShape2DView(o,vec)
Draft.downgrade(FreeCADGui.Selection.getSelection(),delete=False)
FreeCAD.ActiveDocument.recompute()
__objs__=[]
__objs__.append(FreeCAD.getDocument("Unnamed").getObject("Edge"))
__objs__.append(FreeCAD.getDocument("Unnamed").getObject("Edge001"))
__objs__.append(FreeCAD.getDocument("Unnamed").getObject("Edge002"))
import importDXF
importDXF.export(__objs__,u"C:/Temp/edges.dxf")
#del __objs__
Gui.getDocument("Unnamed").getObject("Torus").Visibility=False

and this exporting edges

edges.FCStd

(6.26 KiB) Downloaded 52 times

But I don't think I can move it to master until 0.17 release shakes out.

I'll build it and act as your service bureau if you have tests to run.

If this would be just an enhancement with little additions, I think it could be added for this nice feature...