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Only trigger downsampling on manual changes, add a uppx method

big_data_lines
Tyler Goodlet 2022-03-11 14:49:34 -05:00
parent 7e49b7c033
commit ea5b8f1dd0
1 changed files with 19 additions and 4 deletions
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23
piker/ui/_interaction.py
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@ -363,7 +363,6 @@ class ChartView(ViewBox):
# defaultPadding=0., # defaultPadding=0.,
**kwargs **kwargs
) )
# for "known y-range style" # for "known y-range style"
self._static_yrange = static_yrange self._static_yrange = static_yrange
self._maxmin = None self._maxmin = None
@ -430,7 +429,6 @@ class ChartView(ViewBox):
def maxmin(self, callback: Callable) -> None: def maxmin(self, callback: Callable) -> None:
self._maxmin = callback self._maxmin = callback
def maybe_downsample_graphics(self): def maybe_downsample_graphics(self):
for graphic in self._chart._graphics.values(): for graphic in self._chart._graphics.values():
if isinstance(graphic, BarItems): if isinstance(graphic, BarItems):
@ -442,7 +440,8 @@ class ChartView(ViewBox):
axis=None, axis=None,
relayed_from: ChartView = None, relayed_from: ChartView = None,
): ):
'''Override "center-point" location for scrolling. '''
Override "center-point" location for scrolling.
This is an override of the ``ViewBox`` method simply changing This is an override of the ``ViewBox`` method simply changing
the center of the zoom to be the y-axis. the center of the zoom to be the y-axis.
@ -789,7 +788,7 @@ class ChartView(ViewBox):
# iterate those. # iterate those.
# - only register this when certain downsampleable graphics are # - only register this when certain downsampleable graphics are
# "added to scene". # "added to scene".
vb.sigXRangeChanged.connect(vb.maybe_downsample_graphics) vb.sigRangeChangedManually.connect(vb.maybe_downsample_graphics)
# mouse wheel doesn't emit XRangeChanged # mouse wheel doesn't emit XRangeChanged
vb.sigRangeChangedManually.connect(vb._set_yrange) vb.sigRangeChangedManually.connect(vb._set_yrange)
@ -800,3 +799,19 @@ class ChartView(ViewBox):
) -> None: ) -> None:
self._chart._static_yrange = 'axis' self._chart._static_yrange = 'axis'
def xs_in_px(self) -> float:
'''
Return the "number of x units" within a single
pixel currently being displayed for relevant
graphics items which are our children.
'''
for graphic in self._chart._graphics.values():
# if isinstance(graphic, BarItems):
xpx = graphic.pixelVectors()[0].x()
if xpx:
return xpx
else:
continue
return 1.0