Hello! I'm a chemist trying to write some software for my lab. I'm still
new to coding. The software I'm writing plots unit cell parameters for a
large amount of data as a scatter plot with each individual data containing
error bars using pyqtgraph 0.12.4, Pyside6 6.2.3, and pandas 1.4.1. The
problem I'm having is when I click on the legend to hide a particular
scatter plot, the error bars are left on the plot. I'm not sure if this is
a bug, but it sure is annoying! I managed to create a fix; however, that
fix seems to produce another error that corrects itself but is super
annoying! Here is my fix by subclassing a few pyqtgraph items:
*import *pyqtgraph *as *pg
*class Custom**LegendItem**(*pg.LegendItem*)**:*
*def **__init__**(*self, ***args, ****kwargs*)*
*: *super*()*.__init__*(****args, ****kwargs
*) *self.sampleType *= *DIXBIPItemSample
*class Custom**ScatterPlotItem**(*pg.ScatterPlotItem*)*
*: **def **__init__**(*self, ***args, ****kwargs*)*
*: *super*()*.__init__*(****args, ****kwargs
*) *self.error_item *= *kwargs.pop*(**"error_item"*, *None*
*) **class Custom**ErrorBarItem**(*pg.ErrorBarItem*)*
*: **def **__init__**(*self, ****opts*)*
*: *super*()*.__init__*(*****opts
*) *self.path *= *
*None def **setData**(*self, ****opts*)*
*: *self.opts.update*(*opts
*) **if *self.isVisible*()*
*: *self.setVisible*(*all*(*self.opts*[*ax*] **is not None for *ax
*in **[**'x'*, *'y'**]*
*)) **else*
*: *self.setVisible*(**not *all*(*self.opts*[*ax*] **is not
None for *ax *in **[**'x'*, *'y'**]*
*)) *self.path *= *
*None *self.update
*() *self.prepareGeometryChange
*() *self.informViewBoundsChanged
*() **class Custom**ItemSample**(*pg.ItemSample*)*
*: **def **__init__**(*self, ***args, ****kwargs*)*
*: *ItemSample.__init__*(*self, ***args, ****kwargs
*) **def **mouseClickEvent**(*self, event*)*
*: **if *event.button*() **== *Qt.MouseButton.LeftButton
*: *visible *= *self.item.isVisible
*() *self.item.setVisible*(**not *visible
*) **if *isinstance*(*self.item.error_item, CustomErrorBarItem
*)*
*: *self.item.error_item.setVisible*(**not *visible
*) *event.accept
*() *self.update*()*
I can now use a custom class for the legend, scatter plot, and error bar
when adding to a plot widget. This is accomplished by passing a custom
error bar item (*error_item*) to a custom scatter plot item as an argument.
Here is the error I receive using my fix:
Traceback (most recent call last):
File
"C:\Python310\lib\site-packages\pyqtgraph\graphicsItems\ErrorBarItem.py",
line 155, in boundingRect
self.drawPath()
File
"C:\Python310\lib\site-packages\pyqtgraph\graphicsItems\ErrorBarItem.py",
line 87, in drawPath
verticalLines = fn.arrayToQPath(xs, y1_y2, connect="pairs")
File "C:\Python310\lib\site-packages\pyqtgraph\functions.py", line 2147,
in arrayToQPath
isfinite = np.isfinite(x) & np.isfinite(y)
ValueError: operands could not be broadcast together with shapes (92,) (94,)
A lot of times, a single error like the one above occurs multiple times in
succession which causes the error bars to flicker in the plot (same error
with shapes (92,) (94,) for example). It eventually stops but occurs later
at a random data point. Even though this error occurs, I can still toggle
the data points and error bars using the legend.
Is there a better way to add error bars to a scatter plot and be able to
toggle their visibility through the legend? If not, is there anyway to
update my fix to avoid that error?
Thanks for any and all help!
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