Can't pick on various scatter markers

Community matplotlib-users
1

I’m having trouble using picker on a scatter plots with various markers (e.g. + and x). It works with the plot command fine. What am I missing?

Sample code below.

import numpy

import pylab

def onpick(event):
print ‘Pick:’,event.ind

fig = pylab.figure()

ax = fig.add_subplot(111)

x1,y1 = numpy.random.random((2,100))

series1=ax.plot(x1,y1,marker=‘x’,color=‘b’,linestyle=’’,label=‘plot’,picker=5)

x2,y2 = numpy.random.random((2,100))

series2=ax.scatter(x2,y2,marker=‘x’,color=‘g’,label=‘scatter-X’,picker=5)

x3,y3 = numpy.random.random((2,100))

series3=ax.scatter(x3,y3,marker=‘o’,color=‘r’,label=‘scatter-O’,picker=5)

fig.canvas.mpl_connect(‘pick_event’,onpick)

pylab.legend()

pylab.show()

2

This bug or feature? is still in matplotlib 0.99.1.1 (Ubuntu 10.04 LTS)

More precisely scatter using symbols with zero area ('x', '+') will not
pick, regardless of the float value in picker.
Although this DOES work with plot, you can't vary the marker size between
points like you can with scatter.
I have also confirmed this in a version of the example in the docs
http://matplotlib.sourceforge.net/users/event_handling.html#picking-exercise
Which I could upload, but the code below is just fine.

If this is a feature, I suggest it be stated in the documentation.

Kyle Whitmer wrote:

···

I'm having trouble using picker on a scatter plots with various markers
(e.g. + and x). It works with the plot command fine. What am I missing?
Sample code below.

import numpy
import pylab

def onpick(event):
    print 'Pick:',event.ind

fig = pylab.figure()
ax = fig.add_subplot(111)

x1,y1 = numpy.random.random((2,100))
series1=ax.plot(x1,y1,marker='x',color='b',linestyle='',label='plot',picker=5)
x2,y2 = numpy.random.random((2,100))
series2=ax.scatter(x2,y2,marker='x',color='g',label='scatter-X',picker=5)
x3,y3 = numpy.random.random((2,100))
series3=ax.scatter(x3,y3,marker='o',color='r',label='scatter-O',picker=5)

fig.canvas.mpl_connect('pick_event',onpick)
pylab.legend()
pylab.show()

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