Matplotlib Button

Question

Matplotlib Widget Buttons event and fig.canvas.mpl_connect('button_press_event') will both be triggered when mouse is clicked against the button.

My problem are :

1) how to make fig.canvas.mpl_connect('button_press_event') event have a higher priority ? and 2) how to tell within an fig.canvas.mpl_connect('button_press_event') event whether the button is being clicked or not.

import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button, RadioButtons


fig = plt.figure()
# plotting
X=[1,2,3]
Y=[10,20,30]
ax  = fig.add_subplot(1, 1, 1)
ax.plot(X,Y,'bo-')
ax.grid()
ax.legend()
X1=[]
Y1=[]

def on_press(event):
    print "canvas clicked"
    print "how can I tell whether the button is clicked?"
    print event
def on_button_clicked(event):
    print "button clicked"
    print event
axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
bnext = Button(axnext, 'Next')
bnext.on_clicked(on_button_clicked)
fig.canvas.mpl_connect('button_press_event', on_press)
plt.show()

gg349 · Accepted Answer · 2014-01-11 20:55:47Z

About the first point, why do you need that? Can you just ignore the event in that case?

Regarding the second point, you can use bnext.label.clipbox.get_points() to extract the coordinates of the button, and compare them with the coordinates of the mouse event, like in the example below:

import matplotlib.pylab as plt
from matplotlib.widgets import Button


fig,ax = plt.subplots()
ax.plot([1,2,3],[10,20,30],'bo-')
axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
bnext = Button(axnext, 'Next')

(xm,ym),(xM,yM)=bnext.label.clipbox.get_points()

def on_press(event):

    if xm<event.x<xM and ym<event.y<yM:
        print "Button clicked, do nothing. This triggered event is useless."
    else:
        print "canvas clicked and Button not clicked. Do something with the canvas."
    print event
def on_button_clicked(event):
    print "button clicked, do something triggered by the button."
    print event

bnext.on_clicked(on_button_clicked)
fig.canvas.mpl_connect('button_press_event', on_press)
plt.show()

Geoff · Accepted Answer · 2021-10-12 23:52:36Z

You could also use the axes that event happened in as in the code below. Note, text is inserted into the plot rather than using prints just because I was developing this in Jupyter and interactive plots don't show print statements.

import numpy as np
import matplotlib.pylab as plt
from matplotlib.widgets import Button, CheckButtons
import time

plt.close('all')
fig,ax = plt.subplots()
ax.plot([1,2,3],[10,20,30],'bo-')
axcnt=0
plt.subplots_adjust(bottom=0.25)

axnext = plt.axes([0.81, 0.05, 0.1, 0.075]) #l,b,w,h
bnext = Button(axnext, 'Next')
nxtcnt=0

axchk = plt.axes([0.0, 0.05, 0.2, 0.125]) #l,b,w,h 
bchk = CheckButtons(axchk, ('Check',))
chkcnt=0

def on_press(event):
    global cancnt; cancnt += 1
    txt = plt.figtext(0.2,0.3,f"canvas clicked {cancnt}")
    fig.canvas.draw(); time.sleep(2); txt.remove(); fig.canvas.draw()
    
    
    if event.inaxes == ax:
        global axcnt; axcnt += 1
        txt = plt.figtext(0.4,0.0,f"ax clicked {axcnt}")
        fig.canvas.draw(); time.sleep(2); txt.remove(); fig.canvas.draw()
        
def on_next_button_clicked(event):
    global nxtcnt; nxtcnt += 1
    txt = plt.figtext(0.7,0.0, f"next button clicked {nxtcnt}")
    fig.canvas.draw(); time.sleep(2); txt.remove(); fig.canvas.draw()
    
def on_chk_button_clicked(event):
    global chkcnt; chkcnt += 1
    txt = plt.figtext(0.0,0.0, f"check button clicked {chkcnt}")
    fig.canvas.draw(); time.sleep(2); txt.remove(); fig.canvas.draw()

bnext.on_clicked(on_next_button_clicked)
bchk.on_clicked(on_chk_button_clicked)
            
fig.canvas.mpl_connect('button_press_event', on_press)
cancnt=0
txt = plt.figtext(0.2,0.9,f"test {cancnt}")

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