Run Chaco and Mayavi on PySide

Well, there was the long-awaited release of PySide. Some habravchane begin to use it for the first time, some have already dealt with it.

In my work, we have to use Mayavi cross-platform visualizer and Chaco chart builder ( if you are interested, read code.enthought.com/chaco and code.enthought.com/projects/mayavi ). My task was to embed their frames in my HPGL-GUI application. Initially, I wrote everything on PyQt4 and everything suited me, except for one thing. The problem was the license. PySide is released under the LGPL v2.1, which is just right for commercial needs.

PySide came to the rescue, which has already begun to be actively used as a backend to Enthought products. It was then that the first pitfalls awaited me.
')
Lack of documentation on exactly how to use PySide for embedding.
Having a little browsing through the sources, I found out that it is enough to specify the environment variable 'QT_API' to the value 'pyside':

import os
os . environ [ 'QT_API' ] = 'pyside'

Despite this, the application refused to work. It is useful to edit the source. It seemed that there were not so many changes, but finding problems from scratch is rather disgusting and time consuming. I hope further instructions will help someone.


The first thing you need to collect packages from the gita. We set ourselves PySide, git, subversion, setuptools, swig, numpy, scipy, vtk, wxpython. For Windows, you also need to install mingw (vtk and wxpython for Win, I advise you to take from here to save time www.lfd.uci.edu/~gohlke/pythonlibs ).

• Download and put in the ETS daddy, go to it and clone the repositories:
  

  git clone git: // github.com / enthought / traits.git Traits
  git clone git: // github.com / enthought / traitsbackendqt.git TraitsBackendQt
  git clone git: // github.com / enthought / traitsbackendwx.git TraitsBackendWX
  git clone git: // github.com / enthought / traitsgui.git TraitsGUI
  git clone git: // github.com / enthought / enable.git Enable
  git clone git: // github.com / enthought / chaco.git Chaco
  git clone git: // github.com / enthought / mayavi.git Mayavi
  git clone git: // github.com / enthought / enthoughtbase.git EnthoughtBase
  git clone git: // github.com / enthought / envisagecore.git EnvisageCore
  git clone git: // github.com / enthought / envisageplugins.git EnvisagePlugins
  git clone git: // github.com / enthought / etsdevtools.git ETSDevTools
  git clone git: // github.com / enthought / blockcanvas.git BlockCanvas
  git clone git: // github.com / enthought / graphcanvas.git GraphCanvas
  git clone git: // github.com / enthought / codetools.git CodeTools
  git clone git: // github.com / enthought / apptools.git AppTools
  git clone git: // github.com / enthought / scimath.git SciMath

• Run the build:
  

  python ets. py develop

• If the build fails, then install the necessary packages and restart the script.
• After successful assembly, go to the directory Mayavi / enthought / tvtk / pyface / ui / qt4 /
  Open all the files one by one and change the import of PyQt4 to PySide.
  If desired, you can use the design of the form:
  

  import os
  qt_api = os . environ . get ( 'QT_API' , 'pyqt' )
  if qt_api == 'pyqt' :
  from PyQt4 import QtGui, QtCore
  else :
  from PySide import QtGui, QtCore

• In the init.py file from the same directory, you need to comment out lines 26-30 with checking the version of PyQt:
  

  #if QtCore.QT_VERSION <0x040200:
  # raise RuntimeError, "Need Qt v4.2 or higher, but not got v% s"% QtCore.QT_VERSION_STR
  
  #if QtCore.PYQT_VERSION <0x040100:
  # raise RuntimeError, "Need PyQt v4.1 or higher, but not got% s"% QtCore.PYQT_VERSION_STR

• edit the TraitsBackendQt / enthought / traits / ui / qt4 / ui_panel.py file in lines 920-926 (__add_widget (...) function):
  

  if row < 0 :
  if isinstance ( w, QtGui. QWidget ) :
  layout. addWidget ( w )
  elif isinstance ( w, QtGui. QLayout ) :
  layout. addLayout ( w )
  else :
  layout. addWidget ( w )

• For those who want to work under Win, you need to fix the file Mayavi \ enthought \ tvtk \ pyface \ ui \ qt4 \ QVTKRenderWindowInteractor.py
  
  Add to imports:
  

  from ctypes import pythonapi, c_void_p, py_object
  pythonapi. PyCObject_AsVoidPtr . restype = c_void_p
  pythonapi. PyCObject_AsVoidPtr . argtypes = [ py_object ]

  
  and, using a text editor replacement, change str (int (self.winId ())) to str (int (pythonapi.PyCObject_AsVoidPtr (self.winId ())))
  

After all these manipulations, you can run an example.
For Chaco: pastebin.ubuntu.com/575888
For Mayavi: pastebin.ubuntu.com/575889

Screenshots of working widgets:



PS If someone is interested, I can write articles on the possibilities and pitfalls of Chaco and Mayavi.