# -*- coding: utf-8 -*-

## 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 initExample ## Add path to library (just for examples; you do not need this)


from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg

#QtGui.QApplication.setGraphicsSystem('raster')
app = QtGui.QApplication([])
#mw = QtGui.QMainWindow()
#mw.resize(800,800)

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

win = pg.GraphicsWindow(title="View Linking Examples")
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")
#QtGui.QApplication.processEvents()


## 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_()