need help setting the tick positions in a histogramLUT

[Jeremy Webster]

Hi

I am trying to programmatically move one of the ticks in the gradient editor of a histogramLUT.  I tried this...

hist = pg.HistogramLUTItem()

hist.setImageItem(my_image)

hist.gradient.loadPreset('yellowy')

current_ticks = hist.gradient.listTicks()
hist.gradient.setTickValue(current_ticks[2], 0.4)

But I get the error:

File "/Users/myname/directory/plot.py", line 99, in update_images
    hist.gradient.setTickValue(current_ticks[2], 0.4)
  File "/Users/myname/opt/anaconda3/envs/my_env/lib/python3.6/site-packages/pyqtgraph/graphicsItems/GradientEditorItem.py", line 309, in setTickValue
    pos = tick.pos()
AttributeError: 'tuple' object has no attribute 'pos'

Am I missing something?  Or is there a better way to do this?

Thanks

J

[Jeremy Webster]

I figured it out I think.  hist.gradient.listTicks() returns a list of tuples with the tick object in the 0 position and (I believe) the position in the second.  So changing the setTickValue line to...

hist.gradient.setTickValue(current_ticks[2][0], 0.7)

runs, and changes the position of the tick on the widget

Thanks for your time, carry on