Create a plplot Qt Designer plugin.
Attached, please find the a file with the designer.pro, qtplplotplugin.h, qtplplotplugin.cpp and Makefiles.
Also, I have include the release binaries.
You will need to make sure plplotd.dll, qsastime.dll and qt.dll (this is the Plplot Qt driver are in your path). I simply copied these to $QTDIR\bin.
Then place qtplplotplugin.dll, qtplplotplugin.lib in $QTDIR\plugins\designer.
The module is loaded under "Display Widgets" with name "QtPLWidget"
File with sources, designer.pro and binaries
Please wait a bit.
The plugin is not quite yet ready.
It loads fine but it generates the bad files, namely, there is an #include "qtextwidegt.h" which gets mysteriously added.
I should be able to fix it if I can fine some time.