/usr/lib/python2.7/dist-packages/pyqtgraph/examples/multiplePlotSpeedTest.py is in python-pyqtgraph 0.9.10-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | # -*- coding: utf-8 -*-
import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
app = pg.mkQApp()
plt = pg.PlotWidget()
app.processEvents()
## Putting this at the beginning or end does not have much effect
plt.show()
## The auto-range is recomputed after each item is added,
## so disabling it before plotting helps
plt.enableAutoRange(False, False)
def plot():
start = pg.ptime.time()
n = 15
pts = 100
x = np.linspace(0, 0.8, pts)
y = np.random.random(size=pts)*0.8
for i in xrange(n):
for j in xrange(n):
## calling PlotWidget.plot() generates a PlotDataItem, which
## has a bit more overhead than PlotCurveItem, which is all
## we need here. This overhead adds up quickly and makes a big
## difference in speed.
#plt.plot(x=x+i, y=y+j)
plt.addItem(pg.PlotCurveItem(x=x+i, y=y+j))
#path = pg.arrayToQPath(x+i, y+j)
#item = QtGui.QGraphicsPathItem(path)
#item.setPen(pg.mkPen('w'))
#plt.addItem(item)
dt = pg.ptime.time() - start
print("Create plots took: %0.3fms" % (dt*1000))
## Plot and clear 5 times, printing the time it took
for i in range(5):
plt.clear()
plot()
app.processEvents()
plt.autoRange()
def fastPlot():
## Different approach: generate a single item with all data points.
## This runs about 20x faster.
start = pg.ptime.time()
n = 15
pts = 100
x = np.linspace(0, 0.8, pts)
y = np.random.random(size=pts)*0.8
xdata = np.empty((n, n, pts))
xdata[:] = x.reshape(1,1,pts) + np.arange(n).reshape(n,1,1)
ydata = np.empty((n, n, pts))
ydata[:] = y.reshape(1,1,pts) + np.arange(n).reshape(1,n,1)
conn = np.ones((n*n,pts))
conn[:,-1] = False # make sure plots are disconnected
path = pg.arrayToQPath(xdata.flatten(), ydata.flatten(), conn.flatten())
item = QtGui.QGraphicsPathItem(path)
item.setPen(pg.mkPen('w'))
plt.addItem(item)
dt = pg.ptime.time() - start
print("Create plots took: %0.3fms" % (dt*1000))
## Plot and clear 5 times, printing the time it took
if hasattr(pg, 'arrayToQPath'):
for i in range(5):
plt.clear()
fastPlot()
app.processEvents()
else:
print("Skipping fast tests--arrayToQPath function is missing.")
plt.autoRange()
## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
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