38 lines
1.1 KiB
Python
Executable File
38 lines
1.1 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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## Display an animated arrowhead following a curve.
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## This example uses the CurveArrow class, which is a combination
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## of ArrowItem and CurvePoint.
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##
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## To place a static arrow anywhere in a scene, use ArrowItem.
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## To attach other types of item to a curve, use CurvePoint.
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## Add path to library (just for examples; you do not need this)
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import initExample ## Add path to library (just for examples; you do not need this)
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import numpy as np
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from pyqtgraph.Qt import QtGui, QtCore
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import pyqtgraph as pg
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app = QtGui.QApplication([])
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mw = QtGui.QMainWindow()
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mw.resize(300,300)
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p = pg.PlotWidget()
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mw.setCentralWidget(p)
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c = p.plot(x=np.sin(np.linspace(0, 2*np.pi, 1000)), y=np.cos(np.linspace(0, 6*np.pi, 1000)))
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a = pg.CurveArrow(c)
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p.addItem(a)
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mw.show()
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anim = a.makeAnimation(loop=-1)
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anim.start()
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## Start Qt event loop unless running in interactive mode or using pyside.
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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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app.exec_()
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