#!/usr/bin/env python
# coding: utf-8

# # Zooming and Panning

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get_ipython().run_line_magic('matplotlib', 'widget')
import matplotlib.pyplot as plt

from mpl_interactions import ioff, panhandler, zoom_factory


# ## Load a sample image

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# A sample image
image = plt.imread("https://github.com/matplotlib/matplotlib/raw/v3.3.0/lib/matplotlib/mpl-data/sample_data/ada.png")


# ## enable scroll to zoom
# 
# Originally based on https://gist.github.com/tacaswell/3144287.
# 
# To use just pass the axis object to the zoom factory function. Here I also demonstrate using `ioff` as a context manager so we can control where the figure canvas shows up.

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with ioff:
    fig, ax = plt.subplots()
ax.imshow(image)
disconnect_zoom = zoom_factory(ax)
display(fig.canvas)


# ## Scrolling and panning
# 
# 
# I like being able to pan by clicking with the mouse without having to click the toolbar. Below is an example demonstrating using the `panhandler` object allow scrolling using the middle mouse button though by changing the `button` attribute you can use any mouse button. You need to make sure to assign the panhanler to a variable otherwise it will be garbage collected and will not work.

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pan_handler = panhandler(fig)
display(fig.canvas)


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