node editor - pyflow

[microelly2]

very impressive what pyflow can do in the next version. I will start rebase for my FreeCAD version soon.

@microelly2 Question, why are you coding functionality to make pyflow compatible with py2 ? ( https://pythonclock.org/ )
https://github.com/wonderworks-software/PyFlow/pull/48

These are not py2 compatibility patches, I had some erros when pyflow worked inside freecad. So I made a version with some hacks to get it running.
when I rebase my version of pyflow I have to check that it runs with the py3 version of FreeCAD. This will be one of the next steps.
Maybe I get pyflow already running inside FreeCAD without modifications, otherwise I will discuss all conflicts with ilgar next weeks to get the conflicts solved. There was no time during summer to do that, but now raining has started and we can come in to the computers again.

my todo list for october:

* end user documentation of the existing nodes
* rebase pyflow
* compatibility to py3
* first alpha release

[microelly2]

my todo list for october:
* end user documentation of the existing nodes - started in http://freecadbuch.de/doku.php?id=nodes
* rebase pyflow - done, the nodeeditor now works with the original PyFlow@wonderworks-software without extra modifications.
* compatibility to py3 - tested for this environment

OS: Ubuntu 14.04.6 LTS (Unity/ubuntu)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18403 (Git) AppImage
Build type: Release
Branch: master
Hash: 0717b4fc23ef1db70964c3977d25e2fe46a739d1
Python version: 3.7.3
Qt version: 5.12.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Germany (de_DE)

[Kunda1]

Hey @looo is pyflow available in conda ?
ref: https://gitmemory.com/issue/IlgarLunin/ ... /515375539

[looo]

Hey @looo is pyflow available in conda ?
ref: https://gitmemory.com/issue/IlgarLunin/ ... /515375539

I am still waiting for a pypi release. Because this is the easiest way to create a conda-forge feedstock

[foadsf]

I see people on this forum are already aware of Blender's plugin Sverchok. But I would like to also point out at Antimony by Matt Keeter.

[microelly2]

I see people on this forum are already aware of Blender's plugin Sverchok. But I would like to also point out at Antimony by Matt Keeter.

All these implementations use the same ideas. So my goal is to get a base implementation where we can start to port the idea of grashopper, sverchok etc to FreeCAD. Another benefit will be to have all the features from different workbenches in one pool. Pyflow is modular, so it is easy to add more packages. I see at the moment two packages by ilgar: pyrr and maya https://github.com/wonderworks-software

[microelly2]

this is one more real application of pyflow nodes.
I worked on steering simulation more than a year ago and stopped because I wondered how to design the user interface. there are a lot of questions the user can investigate and a flexible interface is needed.
with a node for ackermann steering I hope to get a way to simulate chains of trailers too.
https://youtu.be/SBsuudzi0x0
here the pylfow way ..

phpBB [video]

some theory behind ...

sweppath.jpg (54.55 KiB) Viewed 1830 times

Lets have a car with one horse.
in my draft b is the horse and a is the center of the wheel axis.
The horse follows the path and goes to b2.
The car follows from a to a2.
In the approximation we assume that we can model
the movement of the whiffletree or horse
by an arc with center m and angle alpha.
the car must do the same rotation from a to a2
that means the angle a m a2 is the same as b m b2
bm == b2m and
am == a2m
the wheels on axis a are perpendicular to the radius am.
if we do not have a horse but a front axis
the front wheels must be perpendicular to the radius bm.

[microelly2]

There was a question to design a handrail with pyflow

phpBB [video]

use case:
https://www.jlconline.com/photos/buildi ... d-handrail

[microelly2]

inspired by this question
https://forum.freecadweb.org/viewtopic.php?f=3&t=40141

phpBB [video]

the transformation of the bender node is:

Code: Select all

	for u in range(countA):
		for v in range(countB):
			[x,y,z]=poles[u,v]
			poles2[u,v,0]=(a+x)*cos(b*y+c)
			poles2[u,v,1]=(a+x)*sin(b*y+c)
			poles2[u,v,2]=z

[microelly2]

I love the functionality in grasshopper to display and hide shapes along the workflow, So my idea was to have a method with one mouse click to have the same in FreeCAD.
when a node has an outpin Shape_out I can display this shape temporary, So I debug the intermediate results of a workflow.
No extra node is needed. After restart preview is deactivated by default. When I want a shape in FreeCAD persinstent the view3D node can be used.

phpBB [video]

The preview tool was my first shelftool and it is easy to implement such tools.

Code: Select all

class PreviewTool(ShelfTool):
    """docstring for PreviewTool."""
    def __init__(self):
        super( PreviewTool, self).__init__()

    @staticmethod
    def toolTip():
        return "Preview of a node on/off"

    @staticmethod
    def getIcon():
        return QtGui.QIcon(RESOURCES_DIR + "preview.png")

    @staticmethod
    def name():
        return str("PreviewTool")

    def do(self):
         nodes=FreeCAD.PF.graphManager.get().getAllNodes()
         say("selected Nodes ...")
         for n in nodes:
             if n.getWrapper().isSelected():
                say(n)
                n._preview = not n._preview
                n.preview()