"""
This example demonstrates the ability to link the axes of views together
Views can be linked manually using the context menu, but only if they are given 
names.
"""

import numpy as np

import pyqtgraph as pg

app = pg.mkQApp("Linked Views Example")
#mw = QtWidgets.QMainWindow()
#mw.resize(800,800)

x = np.linspace(-50, 50, 1000)
y = np.sin(x) / x

win = pg.GraphicsLayoutWidget(show=True, title="pyqtgraph example: Linked Views")
win.resize(800,600)

win.addLabel("Linked Views", colspan=2)
win.nextRow()

p1 = win.addPlot(x=x, y=y, name="Plot1", title="Plot1")
p2 = win.addPlot(x=x, y=y, name="Plot2", title="Plot2: Y linked with Plot1")
p2.setLabel('bottom', "Label to test offset")
p2.setYLink('Plot1')  ## test linking by name


## create plots 3 and 4 out of order
p4 = win.addPlot(x=x, y=y, name="Plot4", title="Plot4: X -> Plot3 (deferred), Y -> Plot1", row=2, col=1)
p4.setXLink('Plot3')  ## Plot3 has not been created yet, but this should still work anyway.
p4.setYLink(p1)
p3 = win.addPlot(x=x, y=y, name="Plot3", title="Plot3: X linked with Plot1", row=2, col=0)
p3.setXLink(p1)
p3.setLabel('left', "Label to test offset")
#QtWidgets.QApplication.processEvents()

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