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WIP: throttle qt5 mouse motion events by tacaswell · Pull Request #4769 · matplotlib/matplotlib · GitHub

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WIP: throttle qt5 mouse motion events #4769

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WIP: throttle qt5 mouse motion events #4769

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8 changes: 8 additions & 0 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@

import matplotlib

import time as ttime

from matplotlib.cbook import is_string_like
from matplotlib.backend_bases import FigureManagerBase
from matplotlib.backend_bases import FigureCanvasBase
Expand Down Expand Up @@ -242,6 +244,7 @@ def __init__(self, figure):
self._idle = True
w, h = self.get_width_height()
self.resize(w, h)
self._last_mouse_move_time = 0

def enterEvent(self, event):
FigureCanvasBase.enter_notify_event(self, guiEvent=event)
Expand Down Expand Up @@ -274,6 +277,11 @@ def mouseDoubleClickEvent(self, event):
print('button doubleclicked:', event.button())

def mouseMoveEvent(self, event):
cur_time = ttime.time()
if cur_time - self._last_mouse_move_time < 1 / 30:
return
self._last_mouse_move_time = cur_time

x = event.x()
# flipy so y=0 is bottom of canvas
y = self.figure.bbox.height - event.y()
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