Change NavigationToolbar size of matplotlib in Tkinter

Question

Is there a way to change the size of NavigationToolbar (eg the size of zoom button) when embedding matplotlib into Tkinter? I have tried to set the keywords width and height in config , but it did not work. So, any suggestion?

Update

import matplotlib
import os
import Tkinter as tk

from matplotlib.backends.backend_tkagg import NavigationToolbar2TkAgg as NavigationToolbar
from matplotlib.backends.backend_tkagg import ToolTip

class CustomedToolbar(NavigationToolbar):
    def __init__(self, canvas, root):
        NavigationToolbar.__init__(self,canvas,root)

def _Button(self, text, file, command, extension='.ppm'):
    img_file = os.path.join(matplotlib.rcParams['datapath'], 'images', file + extension)
    im = tk.PhotoImage(master=self, file=img_file)
    im = im.zoom(3, 3)
    im = im.subsample(4, 4)
    # Do stuff with im here
    b = tk.Button(master=self, text=text, padx=2, pady=2, image=im, command=command)
    b._ntimage = im
    b.pack(side=tk.LEFT)
    return b

def _init_toolbar(self):
    xmin, xmax = self.canvas.figure.bbox.intervalx
    height, width = 50, xmax-xmin
    tk.Frame.__init__(self, master=self.window,
                                            width=int(width), height=int(height),
                                            borderwidth=2)

    self.update()  # Make axes menu

    for text, tooltip_text, image_file, callback in self.toolitems:
        if text is None:
            # spacer, unhandled in Tk
            pass
        else:
            button = self._Button(text=text, file=image_file, command=getattr(self, callback))
            if tooltip_text is not None:
                ToolTip.createToolTip(button, tooltip_text)

    self.message = tk.StringVar(master=self)
    self._message_label = tk.Label(master=self, textvariable=self.message)
    self._message_label.pack(side=tk.RIGHT)
    self.pack(side=tk.BOTTOM, fill=tk.X)

This is my effort. Thanks fhdrsdg.

Answer 1

If I understand what you want correctly, you can create a custom toolbar class, which inherits from NavigationToolbar2TkAgg . You can the alter the _Button definition in which the buttons are created:

class CustomToolbar(NavigationToolbar2TkAgg):
    def _Button(self, text, file, command, extension='.ppm'):
        img_file = os.path.join(matplotlib.rcParams['datapath'], 'images', file + extension)
        im = Tk.PhotoImage(master=self, file=img_file)
        # Do stuff with im here
        b = Tk.Button(
            master=self, text=text, padx=2, pady=2, image=im, command=command)
        b._ntimage = im
        b.pack(side=Tk.LEFT)
        return b

As you can see, here we have an image file im, which is the image you want to make smaller. Tk.PhotoImage only has subsample() to do this, which lets you shrink the images by a whole factor. For example you could do im = im.subsample(2, 2) to make the images twice as small (or im = im.zoom(2, 2) to make them twice as big).

Maybe someone who is more proficient with PIL could tell you if there's a way to use PIL to make the images any size you want, but I couldn't get that to work.