1 files changed, 62 insertions, 0 deletions

diff --git a/plot/style.py b/plot/style.py
new file mode 100644
index 0000000..7e964b0
--- /dev/null
+++ b/plot/style.py
@@ -0,0 +1,62 @@
+from collections import namedtuple
+import matplotlib.pyplot as plot
+
+class Style(namedtuple('SS', ['marker', 'line', 'color'])):
+    def fmt(self):
+        return self.marker + self.line + self.color
+
+class StyleMap(object):
+    '''Maps configs (dicts) to specific line styles.'''
+    DEFAULT = Style('.', '-', 'k')
+
+    def __init__(self, col_list, col_values):
+        '''Assign (some) columns in @col_list to fields in @Style to vary, and
+        assign values for these columns to specific field values.'''
+        self.value_map = {}
+        self.field_map = {}
+
+        for field, values in self.__get_all()._asdict().iteritems():
+            next_column = col_list.pop(0)
+            value_dict  = {}
+
+            for value in sorted(col_values[next_column]):
+                value_dict[value] = values.pop(0)
+
+            self.value_map[next_column] = value_dict
+            self.field_map[next_column] = field
+
+    def __get_all(self):
+        '''A Style holding all possible values for each property.'''
+        return Style(list('.,ov^<>1234sp*hH+xDd|_'), # markers
+                     ['-', ':', '--'], # lines
+                     list('bgrcmyk'))  # colors
+
+    def get_style(self, kv):
+        '''Translate column values to unique line style.'''
+        style_fields = {}
+
+        for column, values in self.value_map.iteritems():
+            if column not in kv:
+                continue
+            field = self.field_map[column]
+            style_fields[field] = values[kv[column]]
+
+        return StyleMap.DEFAULT._replace(**style_fields)
+
+    def get_key(self):
+        '''A visual description of this StyleMap.'''
+        key = []
+
+        for column, values in self.value_map.iteritems():
+            # print("***%s, %s" % column, values)
+            for v in values.keys():
+                sdict = dict([(column, v)])
+                style = self.get_style(sdict)
+
+                styled_line = plot.plot([], [], style.fmt())[0]
+                description = "%s:%s" % (column, v)
+
+                key += [(styled_line, description)]
+
+        return sorted(key, key=lambda x:x[1])
+