68 lines
1.9 KiB
Python
68 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Demonstrates a way to put multiple axes around a single plot.
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(This will eventually become a built-in feature of PlotItem)
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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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pg.mkQApp()
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pw = pg.PlotWidget()
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pw.show()
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pw.setWindowTitle('pyqtgraph example: MultiplePlotAxes')
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p1 = pw.plotItem
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p1.setLabels(left='axis 1')
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## create a new ViewBox, link the right axis to its coordinate system
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p2 = pg.ViewBox()
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p1.showAxis('right')
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p1.scene().addItem(p2)
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p1.getAxis('right').linkToView(p2)
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p2.setXLink(p1)
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p1.getAxis('right').setLabel('axis2', color='#0000ff')
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## create third ViewBox.
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## this time we need to create a new axis as well.
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p3 = pg.ViewBox()
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ax3 = pg.AxisItem('right')
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p1.layout.addItem(ax3, 2, 3)
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p1.scene().addItem(p3)
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ax3.linkToView(p3)
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p3.setXLink(p1)
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ax3.setZValue(-10000)
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ax3.setLabel('axis 3', color='#ff0000')
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## Handle view resizing
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def updateViews():
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## view has resized; update auxiliary views to match
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global p1, p2, p3
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p2.setGeometry(p1.vb.sceneBoundingRect())
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p3.setGeometry(p1.vb.sceneBoundingRect())
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## need to re-update linked axes since this was called
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## incorrectly while views had different shapes.
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## (probably this should be handled in ViewBox.resizeEvent)
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p2.linkedViewChanged(p1.vb, p2.XAxis)
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p3.linkedViewChanged(p1.vb, p3.XAxis)
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updateViews()
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p1.vb.sigResized.connect(updateViews)
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p1.plot([1,2,4,8,16,32])
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p2.addItem(pg.PlotCurveItem([10,20,40,80,40,20], pen='b'))
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p3.addItem(pg.PlotCurveItem([3200,1600,800,400,200,100], pen='r'))
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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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