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import pygal
from pygal.style import CleanStyle
def ia_coverage_histogram(rows):
"""
Note: this returns a raw pygal chart; it does not render it to SVG/PNG
"""
raw_years = [int(r[0]) for r in rows]
years = dict()
for y in range(min(raw_years), max(raw_years)+1):
years[int(y)] = dict(year=int(y), available=0, missing=0)
for r in rows:
if r[1]:
years[int(r[0])]['available'] = r[2]
else:
years[int(r[0])]['missing'] = r[2]
years = sorted(years.values(), key=lambda x: x['year'])
CleanStyle.colors = ("green", "purple")
label_count = len(years)
if len(years) > 20:
label_count = 10
chart = pygal.StackedBar(dynamic_print_values=True, style=CleanStyle,
width=1000, height=500, x_labels_major_count=label_count,
show_minor_x_labels=False)
#chart.title = "Perpetual Access Coverage"
chart.x_title = "Year"
#chart.y_title = "Releases"
chart.x_labels = [str(y['year']) for y in years]
chart.add('Available', [y['available'] for y in years])
chart.add('Missing', [y['missing'] for y in years])
return chart
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