Functions for plotting area-proportional two- and three-way Venn diagrams in matplotlib.

## Project description

Routines for plotting area-weighted two- and three-circle venn diagrams.

## Important changes in version 0.3

As the use of package name matplotlib.venn was causing occasional conflicts with matplotlib, in version 0.3, the package name was changed to matplotlib_venn. I.e., if in version 0.2 you had to do things like:

from matplotlib.venn import venn3

now the correct way is:

from matplotlib_venn import venn3

## Installation

The simplest way to install the package is via `easy_install` or `pip`:

$ easy_install matplotlib-venn

## Dependencies

`numpy`,`scipy`,`matplotlib`.

## Usage

The package provides four main functions: `venn2`, `venn2_circles`, `venn3` and `venn3_circles`.

The functions `venn2` and `venn2_circles` accept as their only required argument a 3-element list `(Ab, aB, AB)` of subset sizes, e.g.:

venn2(subsets = (3, 2, 1))

and draw a two-circle venn diagram with respective region areas. In the particular example, the region, corresponding to subset `A and not B` will
be three times larger in area than the region, corresponding to subset `A and B`.

Similarly, the functions `venn3` and `venn3_circles` take a 7-element list of subset sizes `(Abc, aBc, ABc, abC, AbC, aBC, ABC)`, and draw a
three-circle area-weighted venn diagram.

The functions `venn2_circles` and `venn3_circles` draw just the circles, whereas the functions `venn2` and `venn3` draw the diagrams as a collection
of colored patches, annotated with text labels.

Note that for a three-circle venn diagram it is not in general possible to achieve exact correspondence between the required set sizes and region areas, however in most cases the picture will still provide a decent indication.

The functions `venn2_circles` and `venn3_circles` return the list of `matplotlib.patch.Circle` objects that may be tuned further
to your liking. The functions `venn2` and `venn3` return an object of class `Venn2` or `Venn3` respectively,
which gives access to constituent patches and text elements.

Basic Example:

from matplotlib_venn import venn2 venn2(subsets = (3, 2, 1))

For the three-circle case:

from matplotlib_venn import venn3 venn3(subsets = (1, 1, 1, 2, 1, 2, 2), set_labels = ('Set1', 'Set2', 'Set3'))

A more elaborate example:

from matplotlib import pyplot as plt import numpy as np from matplotlib_venn import venn3, venn3_circles plt.figure(figsize=(4,4)) v = venn3(subsets=(1, 1, 1, 1, 1, 1, 1), set_labels = ('A', 'B', 'C')) v.get_patch_by_id('100').set_alpha(1.0) v.get_patch_by_id('100').set_color('white') v.get_label_by_id('100').set_text('Unknown') v.get_label_by_id('A').set_text('Set "A"') c = venn3_circles(subsets=(1, 1, 1, 1, 1, 1, 1), linestyle='dashed') c[0].set_lw(1.0) c[0].set_ls('dotted') plt.title("Sample Venn diagram") plt.annotate('Unknown set', xy=v.get_label_by_id('100').get_position() - np.array([0, 0.05]), xytext=(-70,-70), ha='center', textcoords='offset points', bbox=dict(boxstyle='round,pad=0.5', fc='gray', alpha=0.1), arrowprops=dict(arrowstyle='->', connectionstyle='arc3,rad=0.5',color='gray')) plt.show()

## See also

- Blog post: http://fouryears.eu/2012/10/13/venn-diagrams-in-python/
- Report issues and submit fixes at Github: https://github.com/konstantint/matplotlib-venn

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