ASCEE/pyqtgraph
5
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Fixed improper tick spacing and axis scaling

Browse Source 
This requires an API change:
 - AxisItem.setScale(float) has the usual behavior
 - AxisItem.setScale(None) is no longer allowed. Instead use:
 - AxisItem.enableAutoSIPrefix(bool) to enable/disable SI prefix scaling
Also makes the API more intuitive since these features are now accessed and implemented independently.
This commit is contained in:
Luke Campagnola 2013-10-18 14:47:49 -04:00
parent ea6f4ef442
commit 390f78c810
1 changed files with 43 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
pyqtgraph/graphicsItems/AxisItem.py
View File

@ -69,7 +69,8 @@ class AxisItem(GraphicsWidget):
self.tickLength = maxTickLength
self._tickLevels = None ## used to override the automatic ticking system with explicit ticks
self.scale = 1.0
self.autoScale = True
self.autoSIPrefix = True
self.autoSIPrefixScale = 1.0
self.setRange(0, 1)
@ -149,8 +150,8 @@ class AxisItem(GraphicsWidget):
self.setWidth()
else:
self.setHeight()
if self.autoScale:
self.setScale()
if self.autoSIPrefix:
self.updateAutoSIPrefix()
def setLabel(self, text=None, units=None, unitPrefix=None, **args):
"""Set the text displayed adjacent to the axis.
@ -195,10 +196,10 @@ class AxisItem(GraphicsWidget):
def labelString(self):
if self.labelUnits == '':
if self.scale == 1.0:
if not self.autoSIPrefix or self.autoSIPrefixScale == 1.0:
units = ''
else:
units = asUnicode('(x%g)') % (1.0/self.scale)
units = asUnicode('(x%g)') % (1.0/self.autoSIPrefixScale)
else:
#print repr(self.labelUnitPrefix), repr(self.labelUnits)
units = asUnicode('(%s%s)') % (self.labelUnitPrefix, self.labelUnits)
@ -295,22 +296,22 @@ class AxisItem(GraphicsWidget):
to 'V' then a scale of 1000 would cause the axis to display values -100 to 100
and the units would appear as 'mV'
"""
if scale is None:
#if self.drawLabel: ## If there is a label, then we are free to rescale the values
if self.label.isVisible():
#d = self.range[1] - self.range[0]
#(scale, prefix) = fn.siScale(d / 2.)
(scale, prefix) = fn.siScale(max(abs(self.range[0]), abs(self.range[1])))
if self.labelUnits == '' and prefix in ['k', 'm']: ## If we are not showing units, wait until 1e6 before scaling.
scale = 1.0
prefix = ''
self.setLabel(unitPrefix=prefix)
else:
scale = 1.0
self.autoScale = True
else:
self.setLabel(unitPrefix='')
self.autoScale = False
#if scale is None:
##if self.drawLabel: ## If there is a label, then we are free to rescale the values
#if self.label.isVisible():
##d = self.range[1] - self.range[0]
##(scale, prefix) = fn.siScale(d / 2.)
#(scale, prefix) = fn.siScale(max(abs(self.range[0]), abs(self.range[1])))
#if self.labelUnits == '' and prefix in ['k', 'm']: ## If we are not showing units, wait until 1e6 before scaling.
#scale = 1.0
#prefix = ''
#self.setLabel(unitPrefix=prefix)
#else:
#scale = 1.0
#self.autoScale = True
#else:
#self.setLabel(unitPrefix='')
#self.autoScale = False
if scale != self.scale:
self.scale = scale
@ -318,14 +319,32 @@ class AxisItem(GraphicsWidget):
self.picture = None
self.update()
def enableAutoSIPrefix(self, enable=True):
self.autoSIPrefix = enable
def updateAutoSIPrefix(self):
if self.label.isVisible():
(scale, prefix) = fn.siScale(max(abs(self.range[0]*self.scale), abs(self.range[1]*self.scale)))
if self.labelUnits == '' and prefix in ['k', 'm']: ## If we are not showing units, wait until 1e6 before scaling.
scale = 1.0
prefix = ''
self.setLabel(unitPrefix=prefix)
else:
scale = 1.0
self.autoSIPrefixScale = scale
self.picture = None
self.update()
def setRange(self, mn, mx):
"""Set the range of values displayed by the axis.
Usually this is handled automatically by linking the axis to a ViewBox with :func:`linkToView <pyqtgraph.AxisItem.linkToView>`"""
if any(np.isinf((mn, mx))) or any(np.isnan((mn, mx))):
raise Exception("Not setting range to [%s, %s]" % (str(mn), str(mx)))
self.range = [mn, mx]
if self.autoScale:
self.setScale()
if self.autoSIPrefix:
self.updateAutoSIPrefix()
self.picture = None
self.update()
@ -756,7 +775,7 @@ class AxisItem(GraphicsWidget):
## Get the list of strings to display for this level
if tickStrings is None:
spacing, values = tickLevels[i]
strings = self.tickStrings(values, self.scale, spacing)
strings = self.tickStrings(values, self.autoSIPrefixScale * self.scale, spacing)
else:
strings = tickStrings[i]