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added fps class variable to ImageView to enable consistent playback frame rate

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This commit is contained in:
Ben Deverett 2017-09-06 23:30:55 -04:00
parent 8d730f07d9
commit 3fc6eff76f
1 changed files with 6 additions and 4 deletions
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10
pyqtgraph/imageview/ImageView.py
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@ -162,6 +162,7 @@ class ImageView(QtGui.QWidget):
self.keysPressed = {} self.keysPressed = {}
self.playTimer = QtCore.QTimer() self.playTimer = QtCore.QTimer()
self.playRate = 0 self.playRate = 0
self.fps = 1 # 1 Hz by default
self.lastPlayTime = 0 self.lastPlayTime = 0
self.normRgn = LinearRegionItem() self.normRgn = LinearRegionItem()
@ -349,11 +350,14 @@ class ImageView(QtGui.QWidget):
self.image = None self.image = None
self.imageItem.clear() self.imageItem.clear()
def play(self, rate): def play(self, rate=None):
"""Begin automatically stepping frames forward at the given rate (in fps). """Begin automatically stepping frames forward at the given rate (in fps).
This can also be accessed by pressing the spacebar.""" This can also be accessed by pressing the spacebar."""
#print "play:", rate #print "play:", rate
if rate is None:
rate = self.fps
self.playRate = rate self.playRate = rate
if rate == 0: if rate == 0:
self.playTimer.stop() self.playTimer.stop()
return return
@ -400,9 +404,7 @@ class ImageView(QtGui.QWidget):
#print ev.key() #print ev.key()
if ev.key() == QtCore.Qt.Key_Space: if ev.key() == QtCore.Qt.Key_Space:
if self.playRate == 0: if self.playRate == 0:
fps = (self.getProcessedImage().shape[0]-1) / (self.tVals[-1] - self.tVals[0]) self.play()
self.play(fps)
#print fps
else: else:
self.play(0) self.play(0)
ev.accept() ev.accept()