"""
Simple example using BarGraphItem
"""

import numpy as np
import pyqtgraph as pg

win = pg.plot()
win.setWindowTitle('pyqtgraph example: BarGraphItem')

# prepare data

# bars are invisible, might show up when resizing
data = np.random.randint(2E9, 4E9, 1000)

# # if data is not very big, everything is fine
# data_ok = np.random.randint(200, 400, 1000)

counts, edges = np.histogram(data, bins=50)
height = edges[1]-edges[0]
bg1 = pg.BarGraphItem(x0=0, y=edges[:-1], height=height, width=counts, brush='r')
# set viewbox range
vb = win.getPlotItem().getViewBox()
vb.setLimits(xMin=0, 
             xMax=counts.max() * 1.2,
             yMin=edges[0] * 0.9, 
             yMax=edges[-1] * 1.1)

win.addItem(bg1)

if __name__ == '__main__':
    pg.exec()