53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Demonstrates use of FillBetweenItem to fill the space between two plot curves.
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"""
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import initExample ## Add path to library (just for examples; you do not need this)
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import pyqtgraph as pg
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from pyqtgraph.Qt import QtGui, QtCore
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import numpy as np
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#FIXME: When running on Qt5, not as perfect as on Qt4
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win = pg.plot()
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win.setWindowTitle('pyqtgraph example: FillBetweenItem')
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win.setXRange(-10, 10)
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win.setYRange(-10, 10)
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N = 200
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x = np.linspace(-10, 10, N)
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gauss = np.exp(-x**2 / 20.)
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mn = mx = np.zeros(len(x))
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curves = [win.plot(x=x, y=np.zeros(len(x)), pen='k') for i in range(4)]
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brushes = [0.5, (100, 100, 255), 0.5]
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fills = [pg.FillBetweenItem(curves[i], curves[i+1], brushes[i]) for i in range(3)]
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for f in fills:
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win.addItem(f)
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def update():
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global mx, mn, curves, gauss, x
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a = 5 / abs(np.random.normal(loc=1, scale=0.2))
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y1 = -np.abs(a*gauss + np.random.normal(size=len(x)))
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y2 = np.abs(a*gauss + np.random.normal(size=len(x)))
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s = 0.01
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mn = np.where(y1<mn, y1, mn) * (1-s) + y1 * s
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mx = np.where(y2>mx, y2, mx) * (1-s) + y2 * s
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curves[0].setData(x, mn)
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curves[1].setData(x, y1)
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curves[2].setData(x, y2)
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curves[3].setData(x, mx)
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timer = QtCore.QTimer()
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timer.timeout.connect(update)
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timer.start(30)
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## Start Qt event loop unless running in interactive mode or using pyside.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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