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Showing posts from January, 2009

Venn Diagrams with google charts

I recently had the need to view some data sets as venn diagrams , so I found google's chart api and hacked out a little AJAX application to do so, you can try it out here . And, for the fun of it, a VERY simple Python implementation: import urllib from PIL import Image import StringIO def venn_diagram_url(a, b, c, width=400, height=200): values = [width, height, len(a), len(b), len(c)] values.append(len(a & b)) values.append(len(a & c)) values.append(len(c & b)) values.append(len(a & b & c)) base_str = 'http://chart.apis.google.com/chart?' args_str = 'cht=v&chs=%sx%s&chd=t:%s,%s,%s,%s,%s,%s,%s' return base_str + (args_str % tuple(values)) a = set((1, 2, 3)) b = set((2, 4)) c = set((3, 4, 5)) data = StringIO.StringIO(urllib.urlopen(venn_diagram_url(a, b, c)).read()) Image.open(data).show() Not much to it... But maybe someone will find it useful.