get Coordinates of matplotlib plot figure python with mouse click

Question

I have been trying to get the mouse x,y coordinates to variables according to matplotlib plot scale not pixels but it only returns me the integer components like 0.0 or 1.0 I want to return the accurate number like 0.1245 here is my code

import matplotlib
import Tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import numpy as np
import matplotlib.pyplot as plt


def onclick(self,event):
    ix, iy = float(event.xdata), float(event.ydata)

    print 'x = %d, y = %d' % (
        ix, iy)



root = tk.Tk()
circle1 = plt.Circle((0, 0), 1, color='blue')

f = plt.figure()
a = f.add_subplot(111)
f, a = plt.subplots()
a.add_artist(circle1)
a.set_xlim(-1.1, +1.1)
a.set_ylim(-1.1, +1.1)

#a.plot(circle1)
canvas = FigureCanvasTkAgg(f, master=root)
canvas.show()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

canvas.mpl_connect('button_press_event', onclick)

canvas._tkcanvas.pack(side=tk.TOP, fill=tk.BOTH, expand=1)

root.mainloop()

That's interesting. I'm trying this in Python 3, and apart from minor changes (Tkinter -> tkinter, string formatting and def onclick(self, event) -> def onclick(event)), it gives me perfectly accurate results. — TidB
– TidB, Commented Feb 24, 2017 at 9:33
actualy yes python 3 differs of python with some minor changes, thanks for reply :) — Bilal Hairab
– Bilal Hairab, Commented Feb 24, 2017 at 12:27

TidB · Accepted Answer · 2017-02-24 09:39:22Z

1

You are getting accurate results, ix and iy are floats with the accuracy you want. The problem is the formatting in

print 'x = %d, y = %d' % (ix, iy)

%d means that the number should be displayed as an integer, and exactly that is happening here. If you try out %f for float representation:

print 'x = %f, y = %f' % (ix, iy)

you'll see that you're getting accurate results.

answered Feb 24, 2017 at 9:39

TidB

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