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"""
Demonstrates the usage of DateAxisItem to display properly-formatted
timestamps on x-axis which automatically adapt to current zoom level.
"""
import time
import numpy as np
import pyqtgraph as pg
app = pg.mkQApp("DateAxisItem Example")
# Create a plot with a date-time axis
w = pg.PlotWidget(axisItems = {'bottom': pg.DateAxisItem()})
w.showGrid(x=True, y=True)
# Plot sin(1/x^2) with timestamps in the last 100 years
now = time.time()
x = np.linspace(2*np.pi, 1000*2*np.pi, 8301)
w.plot(now-(2*np.pi/x)**2*100*np.pi*1e7, np.sin(x), symbol='o')
w.setWindowTitle('pyqtgraph example: DateAxisItem')
w.show()
if __name__ == '__main__':
pg.exec()
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