surface.pro Example File
surface/surface.pro
  android|ios|winrt {
      error( "This example is not supported for android, ios, or winrt." )
  }
  !include( ../examples.pri ) {
      error( "Couldn't find the examples.pri file!" )
  }
  SOURCES += main.cpp \
             surfacegraph.cpp
  HEADERS += surfacegraph.h
  QT += widgets
  requires(qtConfig(combobox))
  RESOURCES += surface.qrc
  OTHER_FILES += doc/src/* \
                 doc/images/*