X-Git-Url: http://git.tremily.us/?p=hooke.git;a=blobdiff_plain;f=doc%2Fhacking.txt;h=e1e08c00c6671d3da91514bf379fd675fef634f7;hp=fb9a7d444ff571d4f5e49b145d54d62937e51b33;hb=HEAD;hpb=48b2f3dd2f166f261b03288ae10bf60abbfc05f1

diff --git a/doc/hacking.txt b/doc/hacking.txt
index fb9a7d4..e1e08c0 100644
--- a/doc/hacking.txt
+++ b/doc/hacking.txt
@@ -12,12 +12,13 @@ Dependencies
 
 To clean up the internals, were going to go crazy on the
 object-oriented front, and try to keep the core functionality free of
-any dependencies other than the `Python Standard Library`_ and Numpy_
-/ Scipy_.
+any dependencies other than the `Python Standard Library`_, Numpy_,
+Scipy_, and PyYAML_.
 
 .. _Python Standard Library: http://docs.python.org/library/
 .. _Numpy: http://numpy.scipy.org/
 .. _Scipy: http://www.scipy.org/
+.. _PyYAML: http://pyyaml.org/
 
 To make a responsive user interface in parallel with data processing
 and possible GUIs, we'll use Python's multiprocessing_ module.  This
@@ -36,6 +37,21 @@ the :doc:`testing` section for more information.
 .. _nose: http://somethingaboutorange.com/mrl/projects/nose/0.11.3/
 
 
+Principles
+==========
+
+Hooke aims to be easily modified and extended by new recruits.  To
+make this easier, we try to abide by several programming practices.
+
+* `DRY`_ (Don't Repeat Yourself), also phrased as "Every piece of
+  knowledge must have a single, unambiguous, authoritative
+  representation within a system."
+* `LoD`_ (Law of Demeter): Don't reach through layers, e.g. `a.b.c.d()`.
+
+.. _DRY: http://en.wikipedia.org/wiki/Don%27t_repeat_yourself
+.. _LoD: http://en.wikipedia.org/wiki/Law_of_Demeter
+
+
 Architecture
 ============
 
@@ -132,3 +148,55 @@ There are also a number of features who's standard library support
 changes with different versions of Python.  :mod:`~hooke.compat`
 provides a uniform interface to those tools so that Hooke will work
 with several Python versions.
+
+Analysis
+--------
+
+The :class:`hooke.curve.Data` blocks store data in various states of
+processing.  For example, velocity clamp drivers will load two columns
+of data: `z piezo (m)` and `deflection (m)` (all column names have the
+`name (unit)` format, see :func:`~hooke.util.si.split_data_label`).
+Most data processing consists of manipulating current block
+information to create additional data columns in the same block.  For
+example, :class:`~hooke.plugin.vclamp.SurfaceContactCommand` usually
+uses the `z piezo (m)` and `deflection (m)` columns to add
+`surface distance (m)` and `surface adjusted deflection (m)` columns.
+However, you might want to use e.g. `median filtered deflection (m)`
+instead of `deflection (m)`.  Because of this, analysis plugins should
+use :class:`~hooke.command.Argument`\s rather than hard-coding source
+or target column or info dict names.  See
+:class:`~hooke.plugin.vclamp.SurfaceContactCommand` for an example of
+the recommended approach.
+
+Also keep in mind that some analyses will not generate columns that
+are the same size as the source data
+(e.g. :class:`~hooke.plugin.flatfilt.FlatPeaksCommand` and
+:class:`~hooke.plugin.curve.PowerSpectrumCommand`).  These commands
+will either stash information in the :class:`~hooke.curve.Data`'s
+`.info` dictionary (e.g. a list of peaks) and/or add new
+:class:`~hooke.curve.Data` blocks to the parent
+:class:`~hooke.curve.Curve`.  The main reason for adding new blocks
+rather than storing all the data in `.info` is to take advantage of
+built in :class:`~hooke.curve.Data` processing
+:class:`~hooke.command.Command`\s.  For example, the power spectrum
+from :class:`~hooke.plugin.curve.PowerSpectrumCommand` can be easily
+exported to a text file.  However, extra care must be taken to avoid
+name collisions or ambiguity, since the output blocks must be unique
+on a :class:`~hooke.curve.Curve`-wide level, while `Data.info` output
+need only be unique on a :class:`~hooke.curve.Data`-wide level.
+
+GUI
+---
+
+:mod:`hooke.ui.gui` contains enough code that you might want a word
+about its organization before diving into the code.  Information flows
+like this:
+
+.. image:: img/gui_flow/gui_flow.svg
+  
+With the following naming scheme in HookeFrame:
+
+  ===================  ==================
+  callbacks            ``_on_*``
+  response processors  ``_postprocess_*``
+  ===================  ==================