web/views/plots.py
author Katia Saurfelt <katia.saurfelt@logilab.fr>
Tue, 29 Sep 2009 09:22:14 +0200
branchstable
changeset 3507 ff945c7013d9
parent 3338 cd137d90f896
child 3408 c92170fca813
child 3689 deb13e88e037
permissions -rw-r--r--
[form] make EntityFormRenderer a little bit easier to override
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"""basic plot views
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:organization: Logilab
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:copyright: 2007-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import os
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import time
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from simplejson import dumps
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from logilab.common import flatten
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from logilab.mtconverter import xml_escape
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from cubicweb.utils import make_uid, UStringIO, datetime2ticks
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from cubicweb.appobject import objectify_selector
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from cubicweb.web.views import baseviews
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@objectify_selector
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def at_least_two_columns(cls, req, rset=None, *args, **kwargs):
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    if not rset:
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        return 0
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    return len(rset.rows[0]) >= 2
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@objectify_selector
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def all_columns_are_numbers(cls, req, rset=None, *args, **kwargs):
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    """accept result set with at least one line and two columns of result
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    all columns after second must be of numerical types"""
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    for etype in rset.description[0]:
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        if etype not in ('Int', 'Float'):
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            return 0
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    return 1
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@objectify_selector
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def second_column_is_number(cls, req, rset=None, *args, **kwargs):
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    etype = rset.description[0][1]
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    if etype not  in ('Int', 'Float'):
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        return 0
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    return 1
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@objectify_selector
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def columns_are_date_then_numbers(cls, req, rset=None, *args, **kwargs):
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    etypes = rset.description[0]
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    if etypes[0] not in ('Date', 'Datetime'):
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        return 0
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    for etype in etypes[1:]:
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        if etype not in ('Int', 'Float'):
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            return 0
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    return 1
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def filterout_nulls(abscissa, plot):
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    filtered = []
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    for x, y in zip(abscissa, plot):
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        if x is None or y is None:
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            continue
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        filtered.append( (x, y) )
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    return sorted(filtered)
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class PlotWidget(object):
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    # XXX refactor with cubicweb.web.views.htmlwidgets.HtmlWidget
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    def _initialize_stream(self, w=None):
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        if w:
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            self.w = w
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        else:
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            self._stream = UStringIO()
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            self.w = self._stream.write
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    def render(self, *args, **kwargs):
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        w = kwargs.pop('w', None)
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        self._initialize_stream(w)
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        self._render(*args, **kwargs)
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        if w is None:
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            return self._stream.getvalue()
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class FlotPlotWidget(PlotWidget):
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    """PlotRenderer widget using Flot"""
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    onload = u'''
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%(plotdefs)s
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jQuery.plot(jQuery("#%(figid)s"), [%(plotdata)s],
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    {points: {show: true},
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     lines: {show: true},
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     grid: {hoverable: true},
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     xaxis: {mode: %(mode)s}});
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jQuery("#%(figid)s").bind("plothover", onPlotHover);
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'''
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    def __init__(self, labels, plots, timemode=False):
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        self.labels = labels
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        self.plots = plots # list of list of couples
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        self.timemode = timemode
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    def dump_plot(self, plot):
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        # XXX for now, the only way that we have to customize properly
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        #     datetime labels on tooltips is to insert an additional column
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        #     cf. function onPlotHover in cubicweb.flot.js
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        if self.timemode:
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            plot = [(datetime2ticks(x), y, datetime2ticks(x)) for x,y in plot]
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        return dumps(plot)
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    def _render(self, req, width=500, height=400):
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        # XXX IE requires excanvas.js
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        req.add_js( ('jquery.flot.js', 'cubicweb.flot.js', 'excanvas.js') )
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        figid = u'figure%s' % req.varmaker.next()
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        plotdefs = []
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        plotdata = []
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        self.w(u'<div id="%s" style="width: %spx; height: %spx;"></div>' %
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               (figid, width, height))
1891
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        for idx, (label, plot) in enumerate(zip(self.labels, self.plots)):
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            plotid = '%s_%s' % (figid, idx)
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            plotdefs.append('var %s = %s;' % (plotid, self.dump_plot(plot)))
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            plotdata.append("{label: '%s', data: %s}" % (label, plotid))
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        req.html_headers.add_onload(self.onload %
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                                    {'plotdefs': '\n'.join(plotdefs),
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                                     'figid': figid,
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                                     'plotdata': ','.join(plotdata),
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                                     'mode': self.timemode and "'time'" or 'null'})
1892
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1891
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class PlotView(baseviews.AnyRsetView):
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    id = 'plot'
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    title = _('generic plot')
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    __select__ = at_least_two_columns() & all_columns_are_numbers()
1891
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    timemode = False
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    def call(self, width=500, height=400):
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        # prepare data
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        rqlst = self.rset.syntax_tree()
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        # XXX try to make it work with unions
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        varnames = [var.name for var in rqlst.children[0].get_selected_variables()][1:]
1891
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        abscissa = [row[0] for row in self.rset]
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        plots = []
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        nbcols = len(self.rset.rows[0])
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        for col in xrange(1, nbcols):
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            data = [row[col] for row in self.rset]
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parents: 1977
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            plots.append(filterout_nulls(abscissa, data))
1891
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        plotwidget = FlotPlotWidget(varnames, plots, timemode=self.timemode)
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        plotwidget.render(self.req, width, height, w=self.w)
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parents:
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class TimeSeriePlotView(PlotView):
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   145
    __select__ = at_least_two_columns() & columns_are_date_then_numbers()
1891
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    timemode = True
1886
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1886
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   149
try:
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    from GChartWrapper import Pie, Pie3D
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   151
except ImportError:
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    pass
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else:
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    class PieChartWidget(PlotWidget):
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        def __init__(self, labels, values, pieclass=Pie, title=None):
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            self.labels = labels
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            self.values = values
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            self.pieclass = pieclass
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   160
            self.title = title
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   161
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   162
        def _render(self, width=None, height=None):
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   163
            piechart = self.pieclass(self.values)
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   164
            piechart.label(*self.labels)
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   165
            if width is not None:
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   166
                height = height or width
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                piechart.size(width, height)
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diff changeset
   168
            if self.title:
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   169
                piechart.title(self.title)
2312
af4d8f75c5db use xml_escape
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parents: 2161
diff changeset
   170
            self.w(u'<img src="%s" />' % xml_escape(piechart.url))
1892
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1886
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    class PieChartView(baseviews.AnyRsetView):
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   173
        id = 'piechart'
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   174
        pieclass = Pie
1892
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   175
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   176
        __select__ = at_least_two_columns() & second_column_is_number()
1886
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1956
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parents: 1911
diff changeset
   178
        def _guess_vid(self, row):
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   179
            etype = self.rset.description[row][0]
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   180
            if self.schema.eschema(etype).is_final():
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   181
                return 'final'
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diff changeset
   182
            return 'textincontext'
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1886
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   184
        def call(self, title=None, width=None, height=None):
1956
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   185
            labels = []
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   186
            values = []
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   187
            for rowidx, (_, value) in enumerate(self.rset):
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diff changeset
   188
                if value is not None:
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   189
                    vid = self._guess_vid(rowidx)
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   190
                    label = '%s: %s' % (self.view(vid, self.rset, row=rowidx, col=0),
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   191
                                        value)
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   192
                    labels.append(label.encode(self.req.encoding))
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   193
                    values.append(value)
1892
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   194
            pie = PieChartWidget(labels, values, pieclass=self.pieclass,
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diff changeset
   195
                                 title=title)
1886
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diff changeset
   196
            if width is not None:
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   197
                height = height or width
1892
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   198
            pie.render(width, height, w=self.w)
1886
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   201
    class PieChart3DView(PieChartView):
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        id = 'piechart3D'
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        pieclass = Pie3D