d396d33799
* Remove the use of pyqtgraph.ptime With us supporting python3.7+, we have no more need for the ptime module and can instead safely use perf_counter for everything. * Address small issues PR turned up * Reword comment in ImageView
63 lines
1.4 KiB
Python
63 lines
1.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Demonstrates very basic use of ImageItem to display image data inside a ViewBox.
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"""
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## Add path to library (just for examples; you do not need this)
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import initExample
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from pyqtgraph.Qt import QtCore, QtGui
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import numpy as np
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import pyqtgraph as pg
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from time import perf_counter
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app = pg.mkQApp("ImageItem Example")
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## Create window with GraphicsView widget
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win = pg.GraphicsLayoutWidget()
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win.show() ## show widget alone in its own window
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win.setWindowTitle('pyqtgraph example: ImageItem')
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view = win.addViewBox()
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## lock the aspect ratio so pixels are always square
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view.setAspectLocked(True)
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## Create image item
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img = pg.ImageItem(border='w')
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view.addItem(img)
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## Set initial view bounds
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view.setRange(QtCore.QRectF(0, 0, 600, 600))
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## Create random image
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data = np.random.normal(size=(15, 600, 600), loc=1024, scale=64).astype(np.uint16)
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i = 0
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updateTime = perf_counter()
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elapsed = 0
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timer = QtCore.QTimer()
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timer.setSingleShot(True)
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# not using QTimer.singleShot() because of persistence on PyQt. see PR #1605
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def updateData():
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global img, data, i, updateTime, elapsed
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## Display the data
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img.setImage(data[i])
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i = (i+1) % data.shape[0]
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timer.start(1)
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now = perf_counter()
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elapsed_now = now - updateTime
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updateTime = now
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elapsed = elapsed * 0.9 + elapsed_now * 0.1
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# print(f"{1 / elapsed:.1f} fps")
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timer.timeout.connect(updateData)
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updateData()
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if __name__ == '__main__':
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pg.exec()
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