I had a previous question on how to highlight data points in matplotlib using a pick_event (this one here). The solution worked fine until matplotlib changed the usage of the keyword picker. Now I can't get it work anymore. Here is the MWE that worked before:
import matplotlib.pyplot as plt
class MyPlot(object):
def makePlot(self):
self.fig = plt.figure('Test', figsize=(10, 8))
ax = plt.subplot(111)
x = range(0, 100, 10)
y = (5,)*10
ax.plot(x, y, '-', color='red')
ax.plot(x, y, 'o', color='blue', picker=5)
self.highlight, = ax.plot([], [], 'o', color='yellow')
self.cid = plt.connect('pick_event', self.onPick)
plt.show()
def onPick(self, event=None):
this_point = event.artist
x_value = this_point.get_xdata()
y_value = this_point.get_ydata()
ind = event.ind
self.highlight.set_data(x_value[ind][0],y_value[ind][0])
self.fig.canvas.draw_idle()
if __name__ == '__main__':
app = MyPlot()
app.makePlot()
Now I changed this line:
ax.plot(x, y, 'o', color='blue', picker=5)
to this:
ax.xaxis.set_pickradius(5.)
ax.yaxis.set_pickradius(5.)
according to the documentation, but the highlighting does not work anymore. What else do I have to change?
Ok, after some wild random testing I just found the solution. Instead of
ax.plot(x, y, 'o', color='blue', picker=5)
I must use
ax.plot(x, y, 'o', color='blue', picker=True)
ax.xaxis.set_pickradius(5.)
ax.yaxis.set_pickradius(5.)
Looks like the keyword picker only accepts bools or functions, but not floats anymore. And yes, it is actually in the documentation, was just looking at the wrong place.