--- glyph.py.orig       2011-11-24 01:51:01.000000000 +0000
+++ glyph.py    2011-11-24 01:53:12.000000000 +0000
@@ -314,7 +314,7 @@
                   'minorGridLineColor','thickness','min','max', \
                   'graphOnly','yMin','yMax','yLimit','yStep','areaMode', \
                   'areaAlpha','drawNullAsZero','tz', 'yAxisSide','pieMode', \
-                  'yUnitSystem')
+                  'yUnitSystem', 'yAxisType')
   validLineModes = ('staircase','slope')
   validAreaModes = ('none','first','all','stacked')
   validPieModes = ('maximum', 'minimum', 'average')
@@ -326,6 +326,7 @@
       params['hideGrid'] = True
       params['hideAxes'] = True
       params['yAxisSide'] = 'left'
+      params['yAxisType'] = 'linear'
       params['title'] = ''
       params['vtitle'] = ''
       params['margin'] = 0
@@ -345,6 +346,8 @@
       params['yAxisSide'] = 'left'
     if 'yUnitSystem' not in params:
       params['yUnitSystem'] = 'si'
+    if 'yAxisType' not in params:
+      params['yAxisType'] = 'linear'
     self.params = params
     # When Y Axis is labeled on the right, we subtract x-axis positions from the max,
     # instead of adding to the minimum
@@ -642,17 +645,30 @@
         ySpan, spanPrefix = format_units(self.ySpan, self.yStep,
                 system=self.params.get('yUnitSystem'))

-        if ySpan > 10 or spanPrefix != prefix:
-          return "%d %s " % (int(yValue), prefix)
+        if self.params.get('yAxisType') == 'linear':
+            if ySpan > 10 or spanPrefix != prefix:
+              return "%d %s " % (int(yValue), prefix)

-        elif ySpan > 3:
-          return "%.1f %s " % (float(yValue), prefix)
+            elif ySpan > 3:
+              return "%.1f %s " % (float(yValue), prefix)

-        elif ySpan > 0.1:
-          return "%.2f %s " % (float(yValue), prefix)
+            elif ySpan > 0.1:
+              return "%.2f %s " % (float(yValue), prefix)

-        else:
-          return "%g %s" % (float(yValue), prefix)
+            else:
+              return "%g %s" % (float(yValue), prefix)
+        elif self.params.get('yAxisType') == 'log':
+            if ySpan > 10 or spanPrefix != prefix:
+              return "%d %s " % (math.pow(10,int(yValue)), prefix)
+
+            elif ySpan > 3:
+              return "%.1f %s " % (math.pow(10,float(yValue)), prefix)
+
+            elif ySpan > 0.1:
+              return "%.2f %s " % (math.pow(10,float(yValue)), prefix)
+
+            else:
+              return "%g %s " % (math.pow(10,float(yValue)), prefix)

       self.yLabelValues = list( frange(self.yBottom,self.yTop,self.yStep) )
       self.yLabels = map(makeLabel,self.yLabelValues)