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Introduction
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GPI is a development environment for scientific algorithms that provides a
visual workspace for assembling algorithms. Algorithm elements (i.e. nodes) can
be linked together to form a flow diagram. Each node is executed according to
the hierarchy of the diagram.

.. image:: uilabels.jpg
    :align: center
    :width: 50%

This document provides information about configuring and navigating the user
interface as well as extending GPI through the development of new nodes.

The sections :ref:`config-rst` and :ref:`ui-rst` will aid in getting GPI
setup and will provide an overview of the UI visuals, keyboard and mouse
controls.

The :ref:`devguide-rst` is meant to serve as an overview of the node
development process as well as introduce the code elements that will be
required in a complete node code.

The :ref:`node_api-rst` and :ref:`widgets-rst` sections are reference pages
that provide the complete parameter sets, methods, and functions required to
generate a complete node.

The :ref:`pyfi_api-rst` section covers the use of the PyFI libraries in
extending Python with C/C++ code.