Forcing update of axis tick strings in pyqtgraph

[pthomas]

I am collaborating on code that uses a custom class for the time axis:

class TimeStringAxis(pg.AxisItem):
    def __init__(self, orientation='bottom', **kwargs):
        super().__init__(orientation, **kwargs)
        self.tick_strings_mode = 1

    def tickSpacing(self, minVal, maxVal, size):
        span = abs(maxVal - minVal)
        for major, minordiv in const.TICK_SPACINGS:
            if span >= 3*major:
                break
        return [
            (major, 0),
            (major/minordiv, 0),
        ]

    def tickStrings(self, values, scale, spacing):
        if self.tick_strings_mode == 0:
            return values
        elif self.tick_strings_mode == 1:
            return [str(util.TDStr(t)) for t in values]
        else:
            return values

    def setTickStringsMode(self, mode):
        self.tick_strings_mode = mode
        self.update()

The current goal is to be able to change the format of the tick strings from the plot context menu. The issue is that the tick strings do not update until a zoom or pan changes the range. Calling update doesn't seem to do anything. Is there a means to force the axis to repaint after the call to setTickStringsMode?

[Patrick]

Hi,

Try adding self.picture = None into your setTickStringsMode() method. I think the paint uses a rasterised buffer which simply gets redrawn on updates unless the buffer is cleared. So your self.update() is probably actually working - see the paint() method in AxisItem.

Patrick

[Patrick Thomas]

Yes, that works. Thank you!

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