41 lines
1.3 KiB
Python
41 lines
1.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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In this example we draw two different kinds of histogram.
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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 QtCore, QtGui
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import numpy as np
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win = pg.GraphicsWindow()
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win.resize(800,350)
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win.setWindowTitle('pyqtgraph example: Histogram')
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plt1 = win.addPlot()
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plt2 = win.addPlot()
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## make interesting distribution of values
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vals = np.hstack([np.random.normal(size=500), np.random.normal(size=260, loc=4)])
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## compute standard histogram
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y,x = np.histogram(vals, bins=np.linspace(-3, 8, 40))
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## notice that len(x) == len(y)+1
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## We are required to use stepMode=True so that PlotCurveItem will interpret this data correctly.
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curve = pg.PlotCurveItem(x, y, stepMode=True, fillLevel=0, brush=(0, 0, 255, 80))
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plt1.addItem(curve)
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## Now draw all points as a nicely-spaced scatter plot
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y = pg.pseudoScatter(vals, spacing=0.15)
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#plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5)
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plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150))
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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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