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121 lines
4.4 KiB
121 lines
4.4 KiB
# Copyright(c) 2009 by Yaco S.L. <lgs@yaco.es>
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#
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# This file is part of PyCha.
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#
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# PyCha is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# PyCha is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with PyCha. If not, see <http://www.gnu.org/licenses/>.
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from pycha.bar import BarChart, VerticalBarChart, HorizontalBarChart, Rect
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from pycha.chart import uniqueIndices
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class StackedBarChart(BarChart):
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def __init__(self, surface=None, options={}, debug=False):
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super(StackedBarChart, self).__init__(surface, options, debug)
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self.barWidth = 0.0
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def _updateXY(self):
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super(StackedBarChart, self)._updateXY()
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# each dataset is centered around a line segment. that's why we
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# need n + 1 divisions on the x axis
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self.xscale = 1 / (self.xrange + 1.0)
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if self.options.axis.y.range is None:
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# Fix the yscale as we accumulate the y values
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stores = self._getDatasetsValues()
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n_stores = len(stores)
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flat_y = [pair[1] for pair in reduce(lambda a, b: a+b, stores)]
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store_size = len(flat_y) / n_stores
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accum = [sum(flat_y[j]for j in xrange(i,
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i + store_size * n_stores,
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store_size))
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for i in range(len(flat_y) / n_stores)]
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self.yrange = float(max(accum))
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if self.yrange == 0:
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self.yscale = 1.0
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else:
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self.yscale = 1.0 / self.yrange
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def _updateChart(self):
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"""Evaluates measures for vertical bars"""
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stores = self._getDatasetsValues()
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uniqx = uniqueIndices(stores)
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if len(uniqx) == 1:
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self.minxdelta = 1.0
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else:
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self.minxdelta = min([abs(uniqx[j] - uniqx[j-1])
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for j in range(1, len(uniqx))])
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k = self.minxdelta * self.xscale
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self.barWidth = k * self.options.barWidthFillFraction
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self.barMargin = k * (1.0 - self.options.barWidthFillFraction) / 2
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self.bars = []
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class StackedVerticalBarChart(StackedBarChart, VerticalBarChart):
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def _updateChart(self):
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"""Evaluates measures for vertical bars"""
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super(StackedVerticalBarChart, self)._updateChart()
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accumulated_heights = {}
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for i, (name, store) in enumerate(self.datasets):
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for item in store:
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xval, yval = item
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x = ((xval - self.minxval) * self.xscale) + self.barMargin
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w = self.barWidth
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h = abs(yval) * self.yscale
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if yval > 0:
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y = (1.0 - h) - self.origin
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else:
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y = 1 - self.origin
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accumulated_height = accumulated_heights.setdefault(xval, 0)
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y -= accumulated_height
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accumulated_heights[xval] += h
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rect = Rect(x, y, w, h, xval, yval, name)
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if (0.0 <= rect.x <= 1.0) and (0.0 <= rect.y <= 1.0):
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self.bars.append(rect)
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class StackedHorizontalBarChart(StackedBarChart, HorizontalBarChart):
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def _updateChart(self):
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"""Evaluates measures for horizontal bars"""
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super(StackedHorizontalBarChart, self)._updateChart()
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accumulated_widths = {}
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for i, (name, store) in enumerate(self.datasets):
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for item in store:
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xval, yval = item
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y = ((xval - self.minxval) * self.xscale) + self.barMargin
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h = self.barWidth
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w = abs(yval) * self.yscale
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if yval > 0:
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x = self.origin
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else:
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x = self.origin - w
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accumulated_width = accumulated_widths.setdefault(xval, 0)
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x += accumulated_width
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accumulated_widths[xval] += w
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rect = Rect(x, y, w, h, xval, yval, name)
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if (0.0 <= rect.x <= 1.0) and (0.0 <= rect.y <= 1.0):
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self.bars.append(rect)
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