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#!/usr/bin/python
from time import perf_counter
import numpy as np
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore
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()
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