Commit 63c3b36a authored by Luke Campagnola's avatar Luke Campagnola
Browse files

added a few examples

parent ccc81c69
# -*- coding: utf-8 -*-
## This example demonstrates many of the 2D plotting capabilities
## in pyqtgraph. All of the plots may be panned/scaled by dragging with
## the left/right mouse buttons. Right click on any plot to show a context menu.
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
#QtGui.QApplication.setGraphicsSystem('raster')
app = QtGui.QApplication([])
#mw = QtGui.QMainWindow()
#mw.resize(800,800)
win = pg.GraphicsWindow(title="Basic plotting examples")
win.resize(1000,600)
p5 = win.addPlot(title="Scatter plot, axis labels, log scale")
x = np.random.normal(size=1000) * 1e-5
y = x*1000 + 0.005 * np.random.normal(size=1000)
y -= y.min()-1.0
mask = x > 1e-15
x = x[mask]
y = y[mask]
p5.plot(x, y, pen=None, symbol='t', symbolPen=None, symbolSize=10, symbolBrush=(100, 100, 255, 50))
p5.setLabel('left', "Y Axis", units='A')
p5.setLabel('bottom', "Y Axis", units='s')
p5.setLogMode(x=True, y=False)
## 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_()
import initExample ## Add path to library (just for examples; you do not need this)
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
import numpy as np
pg.plot(np.random.normal(size=100000), title="Simplest possible plotting example")
## 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'):
pg.QtGui.QApplication.exec_()
# -*- 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_()
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment