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I have a plot (density plot) from data, used as a background. I add a line or a curve over it, and need to change position of that curve with mouse click.

How can I do that in Python using matplotlib?

Building the plot take time, so I want not to redraw the whole plot, only a simple curve or a line.

Alvaro Silvino
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1 Answers1

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I found similar question. To update the curve the ydata (and xdata if different) need to be updated.

1) assign a handle to the plot with the ydata of your curve

self.h,=self.axes.plot(data,"-g")

2) update the the ydata with your handle 

self.h.set_ydata(newdata)
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