From: W. Trevor King <wking@drexel.edu>
Date: Fri, 20 Aug 2010 08:59:05 +0000 (-0400)
Subject: Convert all channels to their default calibration in the JPK driver.
X-Git-Url: http://git.tremily.us/?p=hooke.git;a=commitdiff_plain;h=53c9d7c2d07fba5c70955c80631e6c485f02de5d

Convert all channels to their default calibration in the JPK driver.

The previous implementation only scaled height and vDeflection, which
meant that the other unscaled (and therefore unitless) columns broke
distance formatting commands (e.g. 'point info').
---

diff --git a/hooke/driver/jpk.py b/hooke/driver/jpk.py
index 1330713..9ba649c 100644
--- a/hooke/driver/jpk.py
+++ b/hooke/driver/jpk.py
@@ -29,6 +29,7 @@ import numpy
 from .. import curve as curve
 from .. import experiment as experiment
 from ..util.util import Closing as Closing
+from ..util.si import join_data_label, split_data_label
 from . import Driver as Driver
 
 
@@ -190,35 +191,45 @@ class JPKDriver (Driver):
 
         # raw column indices
         channels = segment.info['raw info']['channels']['list']
-        z_col = channels.index('height')
-        d_col = channels.index('vDeflection')
-        
-        segment = self._zip_scale_channel(
-            segment, z_col, 'calibrated', path, info)
-        segment = self._zip_scale_channel(
-            segment, d_col, 'distance', path, info)
-
-        assert segment.info['columns'][z_col] == 'height (m)', \
-            segment.info['columns'][z_col]
-        assert segment.info['columns'][d_col] == 'vDeflection (m)', \
-            segment.info['columns'][d_col]
-
-        # scaled column indices same as raw column indices,
-        # because columns is a copy of channels.list
-        segment.info['columns'][z_col] = 'z piezo (m)'
-        segment.info['columns'][d_col] = 'deflection (m)'
+        for i,channel in enumerate(channels):
+            conversion = None
+            if channel == 'vDeflection':
+                conversion = 'distance'
+            segment = self._zip_scale_channel(
+                segment, channel, conversion=conversion, path=path, info=info)
+            name,unit = split_data_label(segment.info['columns'][i])
+            if name == 'vDeflection':
+                assert unit == 'm', segment.info['columns'][i]
+                segment.info['columns'][i] = join_data_label('deflection', 'm')
+            elif name == 'height':
+                assert unit == 'm', segment.info['columns'][i]
+                segment.info['columns'][i] = join_data_label('z piezo', 'm')
         return segment
 
-    def _zip_scale_channel(self, segment, channel, conversion, path, info):
-        channel_name = segment.info['raw info']['channels']['list'][channel]
+    def _zip_scale_channel(self, segment, channel_name, conversion=None,
+                           path=None, info={}):
+        channel = segment.info['raw info']['channels']['list'].index(
+            channel_name)
         conversion_set = segment.info['raw info']['channel'][channel_name]['conversion-set']
+        if conversion == None:
+            conversion = conversion_set['conversions']['default']
+        if conversion == conversion_set['conversions']['base']:
+            # Our conversion is the base data.
+            if conversion != 'volts':
+                raise NotImplementedError(
+                    'unknown units for base channel: %s' % conversion)
+            segment.info['columns'][channel] = join_data_label(
+                channel_name, 'V')
+            return segment
         conversion_info = conversion_set['conversion'][conversion]
+        print channel_name, conversion_info.keys()
         if conversion_info['base-calibration-slot'] \
                 != conversion_set['conversions']['base']:
             # Our conversion is stacked on a previous conversion.  Do
             # the previous conversion first.
             segment = self._zip_scale_channel(
-                segment, channel, conversion_info['base-calibration-slot'],
+                segment, channel_name,
+                conversion_info['base-calibration-slot'],
                 path=path, info=info)
         if conversion_info['type'] == 'file':
             # Michael Haggerty at JPK points out that the conversion
@@ -240,7 +251,7 @@ class JPKDriver (Driver):
         offset = float(conversion_info['scaling']['offset'])
         unit = conversion_info['scaling']['unit']['unit']
         segment[:,channel] = segment[:,channel] * multiplier + offset
-        segment.info['columns'][channel] = '%s (%s)' % (channel_name, unit)
+        segment.info['columns'][channel] = join_data_label(channel_name, unit)
         return segment
 
     def _parse_params(self, lines):