Hello. I wrote earlier this year about the inability to do one-sided errorbars.
I have made changed to bar.py to draw one sided errorbars. Basically, it checks
to see whether minval and maxval exist and sets ignoreMin and ignoreMax
respectively. It then checks both of these prior to plotting the crossbars.
Here are the changes to drawErrorBars(). Please consider incorporating these
changes if you feel that they are useful.
def drawErrorBars(self, painter, posns, barwidth,
yvals, dataset, axes, widgetposn):
"""Draw (optional) error bars on bars."""
s = self.settings
if s.errorstyle == 'none':
return
minval, maxval = self.calculateErrorBars(dataset, yvals)
if minval is None and maxval is None:
return
# handle one sided errors (better) ignore None min/maxVal instead of
plotting zero length//PJK
if minval is None:
minval = yvals
ignoreMin = True
else:
ignoreMin = False
if maxval is None:
maxval = yvals
ignoreMax =True
else:
ignoreMax = False
# convert errors to coordinates
ishorz = s.direction == 'horizontal'
mincoord = axes[not ishorz].dataToPlotterCoords(widgetposn, minval)
mincoord = N.clip(mincoord, -32767, 32767)
maxcoord = axes[not ishorz].dataToPlotterCoords(widgetposn, maxval)
maxcoord = N.clip(maxcoord, -32767, 32767)
# draw error bars
painter.setPen( self.settings.ErrorBarLine.makeQPenWHide(painter) )
w = barwidth*0.25
if ishorz:
utils.plotLinesToPainter(painter, mincoord, posns,
maxcoord, posns)
if s.errorstyle == 'barends':
if ignoreMin is False:
utils.plotLinesToPainter(painter, mincoord, posns-w,
mincoord, posns+w)
if ignoreMax is False:
utils.plotLinesToPainter(painter, maxcoord, posns-w,
maxcoord, posns+w)
else:
utils.plotLinesToPainter(painter, posns, mincoord,
posns, maxcoord)
if s.errorstyle == 'barends':
if ignoreMin is False:
utils.plotLinesToPainter(painter, posns-w, mincoord,
posns+w, mincoord)
if ignoreMax is False:
utils.plotLinesToPainter(painter, posns-w, maxcoord,
posns+w, maxcoord)
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