pyqtgraph/examples/ScaleBar.py

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2013-03-26 17:46:26 +00:00
# -*- coding: utf-8 -*-
"""
Demonstrates ScaleBar
"""
import initExample ## Add path to library (just for examples; you do not need this)
import pyqtgraph as pg
from pyqtgraph.Qt import QtCore, QtGui
import numpy as np
pg.mkQApp()
win = pg.GraphicsLayoutWidget(show=True)
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win.setWindowTitle('pyqtgraph example: ScaleBar')
vb = win.addViewBox()
vb.setAspectLocked()
img = pg.ImageItem()
img.setImage(np.random.normal(size=(100,100)))
img.setScale(0.01)
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vb.addItem(img)
scale = pg.ScaleBar(size=0.1)
scale.setParentItem(vb)
scale.anchor((1, 1), (1, 1), offset=(-20, -20))
## Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()