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Example of embedding a figure into an existing Tk canvas #3546

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Oct 28, 2014
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Example of embedding a figure into an existing Tk canvas #3546

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59 changes: 59 additions & 0 deletions examples/user_interfaces/embedding_in_tk_canvas.py
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#!/usr/bin/env python
# -*- noplot -*-

import matplotlib as mpl
import numpy as np
import Tkinter as tk
import matplotlib.backends.tkagg as tkagg
from matplotlib.backends.backend_agg import FigureCanvasAgg

def draw_figure(canvas, figure, loc=[0,0]):
""" Draw a matplotlib figure onto a Tk canvas

loc: location of top-left corner of figure on canvas in pixels.

Inspired by matplotlib source: lib/matplotlib/backends/backend_tkagg.py
"""
figure_canvas_agg = FigureCanvasAgg(figure)
figure_canvas_agg.draw()
figure_x, figure_y, figure_w, figure_h = figure.bbox.bounds
figure_w, figure_h = int(figure_w), int(figure_h)
photo = tk.PhotoImage(master=canvas, width=figure_w, height=figure_h)

# Position: convert from top-left anchor to center anchor
canvas.create_image(loc[0] + figure_w/2, loc[1] + figure_h/2, image=photo)

# Unfortunatly, there's no accessor for the pointer to the native renderer
tkagg.blit(photo, figure_canvas_agg.get_renderer()._renderer, colormode=2)

# Return a handle which contains a reference to the photo object
# which must be kept live or else the picture disappears
return photo

# Create a canvas
w, h = 300, 200
window = tk.Tk()
window.title("A figure in a canvas")
canvas = tk.Canvas(window, width=w, height=h)
canvas.pack()

# Generate some example data
X = np.linspace(0, 2.0*3.14, 50)
Y = np.sin(X)

# Create the figure we desire to add to an existing canvas
fig = mpl.figure.Figure(figsize=(2, 1))
ax = fig.add_axes([0,0,1,1])
ax.plot(X, Y)

# Keep this handle alive, or else figure will disappear
fig_x, fig_y = 100, 100
fig_photo = draw_figure(canvas, fig, loc=[fig_x, fig_y])
fig_w, fig_h = fig_photo.width(), fig_photo.height()

# Add more elements to the canvas, potentially on top of the figure
canvas.create_line(200, 50, fig_x + fig_w / 2, fig_y + fig_h / 2)
canvas.create_text(200, 50, text="Zero-crossing", anchor="s")

# Let Tk take over
tk.mainloop()