matplotlib - Python: Return coordinate info on mouse click -

i display image in python , allow user click on specific pixel. want use x , y coordinates perform further calculations.

so far, i've been using event picker:

def onpick1(event):     artist = event.artist     if isinstance(artist, axesimage):         mouseevent = event.mouseevent         x = mouseevent.xdata         y = mouseevent.ydata         print x,y  xaxis = frame.shape[1] yaxis = frame.shape[0] fig = plt.figure(figsize=(6,9)) ax = fig.add_subplot(111) line, = [ax.imshow(frame[::-1,:], cmap='jet', extent=(0,xaxis,0,yaxis), picker=5)] fig.canvas.mpl_connect('pick_event', onpick1) plt.show() 

now function onpick1() return x , y can use after plt.show() perform further calculations.

any suggestions?

a lesson gui programming go object oriented. problem right have asynchronous callback , want keep values. should consider packing together, like:

class myclickableimage(object):     def __init__(self,frame):         self.x = none         self.y = none         self.frame = frame         self.fig = plt.figure(figsize=(6,9))         self.ax = self.fig.add_subplot(111)         xaxis = self.frame.shape[1]         yaxis = self.frame.shape[0]         self.im = ax.imshow(self.frame[::-1,:],                    cmap='jet', extent=(0,xaxis,0,yaxis),                    picker=5)         self.fig.canvas.mpl_connect('pick_event', self.onpick1)         plt.show()      # other associated methods go here...      def onpick1(self,event):         artist = event.artist         if isinstance(artist, axesimage):             mouseevent = event.mouseevent             self.x = mouseevent.xdata             self.y = mouseevent.ydata 

now when click on point, set x , y attributes of class. however, if want perform calculations using x , y have onpick1 method perform calculations.