pyqtgraph/examples/infiniteline_performance.py
Ogi Moore d396d33799
Remove the use of pyqtgraph.ptime (#1914)
* 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
2021-07-22 20:57:50 -07:00

50 lines
1.2 KiB
Python

#!/usr/bin/python
import initExample ## Add path to library (just for examples; you do not need this)
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
from time import perf_counter
app = pg.mkQApp("Infinite Line Performance")
p = pg.plot()
p.setWindowTitle('pyqtgraph performance: InfiniteLine')
p.setRange(QtCore.QRectF(0, -10, 5000, 20))
p.setLabel('bottom', 'Index', units='B')
curve = p.plot()
# Add a large number of horizontal InfiniteLine to plot
for i in range(100):
line = pg.InfiniteLine(pos=np.random.randint(5000), movable=True)
p.addItem(line)
data = np.random.normal(size=(50, 5000))
ptr = 0
lastTime = perf_counter()
fps = None
def update():
global curve, data, ptr, p, lastTime, fps
curve.setData(data[ptr % 10])
ptr += 1
now = perf_counter()
dt = now - lastTime
lastTime = now
if fps is None:
fps = 1.0/dt
else:
s = np.clip(dt*3., 0, 1)
fps = fps * (1-s) + (1.0/dt) * s
p.setTitle('%0.2f fps' % fps)
app.processEvents() # force complete redraw for every plot
timer = QtCore.QTimer()
timer.timeout.connect(update)
timer.start(0)
if __name__ == '__main__':
pg.exec()