pyqtgraph/examples/Arrow.py
Luke Campagnola 0f1f6c62e4 Enforced LF file endings
removed stray print statement
2012-05-23 20:29:16 -04:00

36 lines
948 B
Python

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