=== modified file 'Koo/KooChart/GraphicsBarChartItem.py'
--- Koo/KooChart/GraphicsBarChartItem.py	2009-07-01 07:58:54 +0000
+++ Koo/KooChart/GraphicsBarChartItem.py	2010-12-26 20:29:23 +0000
@@ -19,7 +19,6 @@
 from PyQt4.QtGui import *
 from AbstractGraphicsChartItem import *
 
-
 class BarChartBar(QGraphicsRectItem):
 	def __init__(self, parent):
 		QGraphicsRectItem.__init__(self, parent)
@@ -234,17 +233,19 @@
 				else:
 					height = abs( ( (value-minimum) / diff ) * maximumHeight )
 					# Ensure it doesn't go beyond axis due to rounding errors
-					height = min( max( 0.0, height ), maximumHeight )
+                                        height = min( max( 0.0, height ), maximumHeight )
+                                            
 
 				item = BarChartBar( self )
 				if j < len(self._labels):
 					item.setToolTip( '%s: %.2f' % (self._labels[j], value) )
 				item.setBrush( manager.brush(j) )
 				item.setPen( manager.pen(j) )
-				if value >= 0.0:
-					item.setRect( lastPosition, maximumHeight - lastYPosition - height - zero, barWidth, height )
-				else:
-					item.setRect( lastPosition, maximumHeight - lastYPosition - zero, barWidth, height )
+				if value < 0.0:
+                                    # ugly hack, apparently 2 pos must by > 0
+                                    if lastYPosition == 0.0 and height == 0.0:
+                                        height = maximumHeight * 0.001
+				item.setRect( lastPosition, maximumHeight - lastYPosition - height , barWidth, height -zero  )
 				# Hide item if height is 0. Otherwise it's shown as a single
 				# ugly line.
 				if height == 0.0: