Returning mouse cursor coordinates in PyQtGraph

Question

I am new to PyQtGraph and want to use it for a speedy visualization of my data acquisition. Previously I was using matplotlib where redrawing the figure was my bottleneck. A

Answer 1

You need to setup a pyqtgraph.SignalProxy and connect it to a callback:

if p is your plot, it'll look like: pyqtgraph.SignalProxy(p.scene().sigMouseMoved, rateLimit=60, slot=callback)

Whenever the mouse is moved over the plot, the callback is called with an event as an argument, i.e. callback(event). event[0] holds a positional argument you pass to p.vb.mapSceneToView(position).x() for x value and p.vb.mapSceneToView(position).y() for y value.