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"""
Demonstrates ScaleBar
"""
import numpy as np
import pyqtgraph as pg
pg.mkQApp()
win = pg.GraphicsLayoutWidget(show=True)
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)
vb.addItem(img)
scale = pg.ScaleBar(size=0.1)
scale.setParentItem(vb)
scale.anchor((1, 1), (1, 1), offset=(-20, -20))
if __name__ == '__main__':
pg.exec()
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