mirror of https://github.com/snachodog/mybuddy.git
59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
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# -*- coding: utf-8 -*-
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from django.db.models import Count, Sum
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from django.db.models.functions import TruncDate
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from django.utils.translation import gettext as _
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import plotly.offline as plotly
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import plotly.graph_objs as go
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from core.utils import duration_parts
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from reports import utils
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def feeding_intervals(instances):
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"""
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Create a graph showing intervals of feeding instances over time.
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:param instances: a QuerySet of Feeding instances.
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:returns: a tuple of the the graph's html and javascript.
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"""
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totals = instances.annotate(count=Count("id")).order_by("start")
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intervals = []
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last_feeding = totals.first()
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for feeding in totals[1:]:
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interval = feeding.start - last_feeding.start
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if interval.total_seconds() > 0:
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intervals.append(interval)
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last_feeding = feeding
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trace_avg = go.Scatter(
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name=_("Interval"),
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line=dict(shape="spline"),
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x=list(totals.values_list("start", flat=True)),
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y=[i.total_seconds() / 3600 for i in intervals],
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hoverinfo="text",
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text=[_duration_string_hms(i) for i in intervals],
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)
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layout_args = utils.default_graph_layout_options()
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layout_args["title"] = _("<b>Feeding intervals</b>")
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layout_args["xaxis"]["title"] = _("Date")
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layout_args["xaxis"]["rangeselector"] = utils.rangeselector_date()
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layout_args["yaxis"]["title"] = _("Feeding interval (hours)")
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fig = go.Figure({"data": [trace_avg], "layout": go.Layout(**layout_args)})
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output = plotly.plot(fig, output_type="div", include_plotlyjs=False)
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return utils.split_graph_output(output)
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def _duration_string_hms(duration):
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"""
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Format a duration string with hours, minutes and seconds. This is
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intended to fit better in smaller spaces on a graph.
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:returns: a string of the form Xm.
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"""
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h, m, s = duration_parts(duration)
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return "{}h{}m{}s".format(h, m, s)
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