94 lines
2.7 KiB
Python
94 lines
2.7 KiB
Python
# -*- 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_()
|