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Only update curve lengths on non-negative index diffs

fast_step_curve
Tyler Goodlet 2021-11-02 14:04:44 -04:00
parent 739399d5a9
commit a2659d1fde
1 changed files with 5 additions and 2 deletions
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7
piker/ui/_curve.py
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@ -137,6 +137,9 @@ class FastAppendCurve(pg.PlotCurveItem):
# print(f"xrange: {self._xrange}")
istart, istop = self._xrange
# compute the length diffs between the first/last index entry in
# the input data and the last indexes we have on record from the
# last time we updated the curve index.
prepend_length = istart - x[0]
append_length = x[-1] - istop
@ -149,7 +152,7 @@ class FastAppendCurve(pg.PlotCurveItem):
# by default we only pull data up to the last (current) index
x_out, y_out = x[:-1], y[:-1]
if self.path is None or prepend_length:
if self.path is None or prepend_length > 0:
self.path = pg.functions.arrayToQPath(
x_out,
y_out,
@ -177,7 +180,7 @@ class FastAppendCurve(pg.PlotCurveItem):
# # self.path.moveTo(new_x[0], new_y[0])
# self.path.connectPath(old_path)
elif append_length:
elif append_length > 0:
if self._step_mode:
new_x, new_y = step_path_arrays_from_1d(
x[-append_length - 2:-1],