"""basic plot views
:organization: Logilab
:copyright: 2007-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
import os
import time
from simplejson import dumps
from logilab.common import flatten
from logilab.mtconverter import xml_escape
from cubicweb.utils import make_uid, UStringIO, datetime2ticks
from cubicweb.appobject import objectify_selector
from cubicweb.web.views import baseviews
@objectify_selector
def at_least_two_columns(cls, req, rset=None, *args, **kwargs):
if not rset:
return 0
return len(rset.rows[0]) >= 2
@objectify_selector
def all_columns_are_numbers(cls, req, rset=None, *args, **kwargs):
"""accept result set with at least one line and two columns of result
all columns after second must be of numerical types"""
for etype in rset.description[0]:
if etype not in ('Int', 'Float'):
return 0
return 1
@objectify_selector
def second_column_is_number(cls, req, rset=None, *args, **kwargs):
etype = rset.description[0][1]
if etype not in ('Int', 'Float'):
return 0
return 1
@objectify_selector
def columns_are_date_then_numbers(cls, req, rset=None, *args, **kwargs):
etypes = rset.description[0]
if etypes[0] not in ('Date', 'Datetime'):
return 0
for etype in etypes[1:]:
if etype not in ('Int', 'Float'):
return 0
return 1
def filterout_nulls(abscissa, plot):
filtered = []
for x, y in zip(abscissa, plot):
if x is None or y is None:
continue
filtered.append( (x, y) )
return sorted(filtered)
class PlotWidget(object):
# XXX refactor with cubicweb.web.views.htmlwidgets.HtmlWidget
def _initialize_stream(self, w=None):
if w:
self.w = w
else:
self._stream = UStringIO()
self.w = self._stream.write
def render(self, *args, **kwargs):
w = kwargs.pop('w', None)
self._initialize_stream(w)
self._render(*args, **kwargs)
if w is None:
return self._stream.getvalue()
class FlotPlotWidget(PlotWidget):
"""PlotRenderer widget using Flot"""
onload = u'''
%(plotdefs)s
jQuery.plot(jQuery("#%(figid)s"), [%(plotdata)s],
{points: {show: true},
lines: {show: true},
grid: {hoverable: true},
xaxis: {mode: %(mode)s}});
jQuery("#%(figid)s").bind("plothover", onPlotHover);
'''
def __init__(self, labels, plots, timemode=False):
self.labels = labels
self.plots = plots # list of list of couples
self.timemode = timemode
def dump_plot(self, plot):
# XXX for now, the only way that we have to customize properly
# datetime labels on tooltips is to insert an additional column
# cf. function onPlotHover in cubicweb.flot.js
if self.timemode:
plot = [(datetime2ticks(x), y, datetime2ticks(x)) for x,y in plot]
return dumps(plot)
def _render(self, req, width=500, height=400):
# XXX IE requires excanvas.js
req.add_js( ('jquery.flot.js', 'cubicweb.flot.js', 'excanvas.js') )
figid = u'figure%s' % req.varmaker.next()
plotdefs = []
plotdata = []
self.w(u'<div id="%s" style="width: %spx; height: %spx;"></div>' %
(figid, width, height))
for idx, (label, plot) in enumerate(zip(self.labels, self.plots)):
plotid = '%s_%s' % (figid, idx)
plotdefs.append('var %s = %s;' % (plotid, self.dump_plot(plot)))
# XXX ugly but required in order to not crash my demo
plotdata.append("{label: '%s', data: %s}" % (label.replace(u'&', u''), plotid))
req.html_headers.add_onload(self.onload %
{'plotdefs': '\n'.join(plotdefs),
'figid': figid,
'plotdata': ','.join(plotdata),
'mode': self.timemode and "'time'" or 'null'},
jsoncall=req.form.get('jsoncall', False))
class PlotView(baseviews.AnyRsetView):
__regid__ = 'plot'
title = _('generic plot')
__select__ = at_least_two_columns() & all_columns_are_numbers()
timemode = False
def call(self, width=500, height=400):
# prepare data
rqlst = self.cw_rset.syntax_tree()
# XXX try to make it work with unions
varnames = [var.name for var in rqlst.children[0].get_selected_variables()][1:]
abscissa = [row[0] for row in self.cw_rset]
plots = []
nbcols = len(self.cw_rset.rows[0])
for col in xrange(1, nbcols):
data = [row[col] for row in self.cw_rset]
plots.append(filterout_nulls(abscissa, data))
plotwidget = FlotPlotWidget(varnames, plots, timemode=self.timemode)
plotwidget.render(self._cw, width, height, w=self.w)
class TimeSeriePlotView(PlotView):
__select__ = at_least_two_columns() & columns_are_date_then_numbers()
timemode = True
try:
from GChartWrapper import Pie, Pie3D
except ImportError:
pass
else:
class PieChartWidget(PlotWidget):
def __init__(self, labels, values, pieclass=Pie, title=None):
self.labels = labels
self.values = values
self.pieclass = pieclass
self.title = title
def _render(self, width=None, height=None):
piechart = self.pieclass(self.values)
piechart.label(*self.labels)
if width is not None:
height = height or width
piechart.size(width, height)
if self.title:
piechart.title(self.title)
self.w(u'<img src="%s" />' % xml_escape(piechart.url))
class PieChartView(baseviews.AnyRsetView):
__regid__ = 'piechart'
pieclass = Pie
__select__ = at_least_two_columns() & second_column_is_number()
def _guess_vid(self, row):
etype = self.cw_rset.description[row][0]
if self._cw.schema.eschema(etype).final:
return 'final'
return 'textincontext'
def call(self, title=None, width=None, height=None):
labels = []
values = []
for rowidx, (_, value) in enumerate(self.cw_rset):
if value is not None:
vid = self._guess_vid(rowidx)
label = '%s: %s' % (self.view(vid, self.cw_rset, row=rowidx, col=0),
value)
labels.append(label.encode(self._cw.encoding))
values.append(value)
pie = PieChartWidget(labels, values, pieclass=self.pieclass,
title=title)
if width is not None:
height = height or width
pie.render(width, height, w=self.w)
class PieChart3DView(PieChartView):
__regid__ = 'piechart3D'
pieclass = Pie3D