grandcross wrote: ↑Mon Jan 18, 2021 6:20 pm
Thinking through this a little more in the context of Open Rocket. Creating a similar user interface in the model tree will have some challenges. I don't believe the tree has the concept of order at the moment, i.e. nose cone plugs into body tube, fins attach to the ends of the tube, etc.
To assign sub-items to specific uses, you can use App::PropertyLink properties, and then in the execute() function of your object, move these objects as sub-objects (easiest with App::DocumentObjectGroupPython). I attached an example in which you can define parts as the nose cone, body tube, fins and exhaust. Adding the Assembly[2,3,4] commands and making real rocket parts is left as an exercise to the reader :-p
Code: Select all
import FreeCAD as App
class MyViewObject():
def __init__(self, viewObj):
viewObj.Proxy = self
def getIcon(self):
return """
/* XPM */
static char * rocket_xpm[] = {
"16 16 43 1",
" c None",
". c #516EB2",
"+ c #5D79BE",
"@ c #9BB4FF",
"# c #4361A4",
"$ c #FFFFFF",
"% c #ECEDED",
"& c #D5D5D5",
"* c #C3C3C3",
"= c #ACACAC",
"- c #E7E6E6",
"; c #CFCFCF",
"> c #BDBDBE",
", c #A6A7A7",
"' c #F9F9F9",
") c #E1E1E1",
"! c #C9C8C9",
"~ c #B7B8B7",
"{ c #A1A1A0",
"] c #F3F3F3",
"^ c #DADBDB",
"/ c #C3C4C3",
"( c #B2B2B2",
"_ c #9B9C9B",
": c #EDECED",
"< c #D5D5D4",
"[ c #969595",
"} c #E6E7E6",
"| c #CECFCE",
"1 c #BDBDBD",
"2 c #A6A6A6",
"3 c #909090",
"4 c #4C5C8A",
"5 c #FF0000",
"6 c #333F62",
"7 c #FF1F00",
"8 c #FF7600",
"9 c #A9A9A9",
"0 c #FFB200",
"a c #B4B4B4",
"b c #FFD600",
"c c #C7C7C7",
"d c #BBBBBB",
" ",
" ",
" . ",
" +.. ",
" @..#. ",
" $%&*= ",
" $-;>, ",
" ')!~{ ",
" ]^/(_ ",
" :<*=[ ",
" }|123 ",
" 456 ",
" 47876 ",
" 909 ",
" aba ",
" cacdc "};
"""
class MyClass():
def __init__(self, name):
self.Type = 'MyClass'
# See https://forum.freecadweb.org/viewtopic.php?t=11897 for an alternative using Part::FeaturePython, which has all the things necessary for drawing a shape by default.
# If you're just positioning sub-elements, an App::DocumentObjectGroupPython provides the folder behaviour by default with its .Group and should be enough.
obj = App.ActiveDocument.addObject("App::DocumentObjectGroupPython", name)
MyViewObject(obj.ViewObject)
# Use App::PropertySubLink and App::PropertySubLinkList to select specific faces for attachment
obj.addProperty('App::PropertyLink', 'NoseCone', 'Rocket', 'Nose cone')
obj.addProperty('App::PropertyLink', 'BodyTube', 'Rocket', 'Body tube')
obj.addProperty('App::PropertyLinkList', 'Fins', 'Rocket', 'List of objects to attach as fins')
obj.addProperty('App::PropertyLink', 'Exhaust', 'Rocket', 'Hot stuff')
obj.Proxy = self
def execute(self, obj):
# Check if we can proceed
if (obj.NoseCone is None) or (obj.BodyTube is None) or (obj.Fins is None) or (obj.Exhaust is None):
raise Exception("Missing parameter, all parts of the rocket must be defined or it won't fly")
# Remove elements from the folder
while len(obj.Group) > 0:
o = obj.Group[-1]
obj.removeObject(o)
# If the object was generated on the fly by a previous execute() run, use this to discard it from the document
#App.ActiveDocument.removeObject(o.Name)
# Add elements in chosen order, so that they are visually displayed under the folder in the tree
obj.addObject(obj.NoseCone)
obj.addObject(obj.BodyTube)
for fin in obj.Fins:
obj.addObject(fin)
obj.addObject(obj.Exhaust)
print('Do stuff here to position the objects as desired, for example create an Assembly object and put some constraints.')
# Hack from https://forum.freecadweb.org/viewtopic.php?f=22&t=54481
if __name__ == '__main__':
Gui.doCommand("import MyTest")
Gui.doCommand("MyTest.MyClass('Rocket')")
Tested on this version, and the attached example .FCStd made with this version too:
Code: Select all
OS: Ubuntu 20.04.1 LTS (XFCE/xubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.23546 (Git) AppImage
Build type: Release
Branch: master
Hash: 6b017f9a16b15b0e628c8d874c4058442dee5548
Python version: 3.8.6
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United Kingdom (en_GB)
grandcross wrote: ↑Mon Jan 18, 2021 6:20 pm
But it did occur to me that as an initial problem, writing a macro to import from Open Rocket (and Rocksim) might be useful. You'd still do your design in one of these tools for now, but you could then import the parts for 3D printing, […]
I've started to work on embedding other apps in FreeCAD. My goals are to embed Inkscape, GIMP, Blender since my workflow would often involves these if going through exports and imports wasn't such an annoyance. For now I've managed to embed an external window in FreeCAD's Qt MDI (Multiple Document Interface, i.e. the sub-windows fore each document tab), which works for any window given its window ID (turns out getting that is the hard part), proof of concept screenshot attached in the next post, I've reached the max number of attachments for this one.
At the very least, it would be easy to embed these applications, and double-clicking on a part would export the part to a file, run the app to modify it, and poll for changes (pressing Ctrl+S in the app would trigger an update) and re-import.
Also, a FreeCAD .FCStd document is just a .zip with a different extension, and can include arbitrary files. The "Page" object from the Drawing workbench saves the SVG page template inside the .FCStd to ensure that it may be opened on machines where the original file is absent. This makes it possible to save the other app's native format as a sub-file inside the .FCStd, and do the export-run-poll-import gymnastic mentioned above.
Code: Select all
import PySide
from PySide import QtGui
mdi = Gui.getMainWindow().findChild(QtGui.QMdiArea)
xw = QtGui.QWindow.fromWinId(69206027)
xw.setFlags(QtGui.Qt.FramelessWindowHint)
xwd = QtGui.QWidget.createWindowContainer(xw)
mwx = QtGui.QMainWindow()
mwx.layout().addWidget(xwd)
mdiSub = mdi.addSubWindow(xwd)
mdiSub.show()
FreeCAD
Please mark your posts as [solved] 
If the answer you got is a good fit for the wiki, you can edit it!