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** Disclaimer **
This example demonstrates some of the more advanced features
of SWIG--don't say I didn't warn you!
In this example, we've built a simple C++ widget for making
2D plots. The widget is really just a wrapper around some
functions in the gd-1.2 library (for simplicity). However,
the C++ widget relies on callback functions written in
C++. To work around this problem, this example illustrates
how to :
1. Implement a C/C++ callback function in Python
(without C/C++ knowing about it).
2. Use of SWIG typemaps to allow a Python
callable object to be passed in as a function
argument as well as mapping Python file objects into
the FILE * datatype.
3. Adding new methods to a C++ class.
More details about this can be found in the SWIG user's manual.
Notes :
'make ccode' builds a C++ only implementation where our
"widget" is used from a simple C++ program.
'make' or 'make static' builds a Python implementation
that uses the same C++ widget, but with callback functions
written in Python.
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