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352 lines
12 KiB
352 lines
12 KiB
# Copyright(c) 2007-2010 by Lorenzo Gil Sanchez <lorenzo.gil.sanchez@gmail.com>
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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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import math
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import cairo
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from pycha.chart import Chart, Option, Layout, Area, get_text_extents
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from pycha.color import hex2rgb
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class PieChart(Chart):
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def __init__(self, surface=None, options={}, debug=False):
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super(PieChart, self).__init__(surface, options, debug)
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self.slices = []
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self.centerx = 0
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self.centery = 0
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self.layout = PieLayout(self.slices)
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def _updateChart(self):
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"""Evaluates measures for pie charts"""
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slices = [dict(name=key,
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value=(i, value[0][1]))
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for i, (key, value) in enumerate(self.datasets)]
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s = float(sum([slice['value'][1] for slice in slices]))
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fraction = angle = 0.0
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del self.slices[:]
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for slice in slices:
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if slice['value'][1] > 0:
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angle += fraction
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fraction = slice['value'][1] / s
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self.slices.append(Slice(slice['name'], fraction,
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slice['value'][0], slice['value'][1],
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angle))
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def _updateTicks(self):
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"""Evaluates pie ticks"""
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self.xticks = []
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if self.options.axis.x.ticks:
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lookup = dict([(slice.xval, slice) for slice in self.slices])
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for tick in self.options.axis.x.ticks:
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if not isinstance(tick, Option):
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tick = Option(tick)
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slice = lookup.get(tick.v, None)
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label = tick.label or str(tick.v)
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if slice is not None:
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label += ' (%.1f%%)' % (slice.fraction * 100)
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self.xticks.append((tick.v, label))
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else:
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for slice in self.slices:
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label = '%s (%.1f%%)' % (slice.name, slice.fraction * 100)
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self.xticks.append((slice.xval, label))
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def _renderLines(self, cx):
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"""Aux function for _renderBackground"""
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# there are no lines in a Pie Chart
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def _renderChart(self, cx):
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"""Renders a pie chart"""
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self.centerx = self.layout.chart.x + self.layout.chart.w * 0.5
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self.centery = self.layout.chart.y + self.layout.chart.h * 0.5
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cx.set_line_join(cairo.LINE_JOIN_ROUND)
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if self.options.stroke.shadow and False:
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cx.save()
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cx.set_source_rgba(0, 0, 0, 0.15)
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cx.new_path()
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cx.move_to(self.centerx, self.centery)
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cx.arc(self.centerx + 1, self.centery + 2,
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self.layout.radius + 1, 0, math.pi * 2)
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cx.line_to(self.centerx, self.centery)
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cx.close_path()
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cx.fill()
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cx.restore()
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cx.save()
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for slice in self.slices:
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if slice.isBigEnough():
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cx.set_source_rgb(*self.colorScheme[slice.name])
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if self.options.shouldFill:
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slice.draw(cx, self.centerx, self.centery,
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self.layout.radius)
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cx.fill()
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if not self.options.stroke.hide:
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slice.draw(cx, self.centerx, self.centery,
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self.layout.radius)
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cx.set_line_width(self.options.stroke.width)
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cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
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cx.stroke()
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cx.restore()
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if self.debug:
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cx.set_source_rgba(1, 0, 0, 0.5)
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px = max(cx.device_to_user_distance(1, 1))
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for x, y in self.layout._lines:
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cx.arc(x, y, 5 * px, 0, 2 * math.pi)
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cx.fill()
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cx.new_path()
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cx.move_to(self.centerx, self.centery)
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cx.line_to(x, y)
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cx.stroke()
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def _renderAxis(self, cx):
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"""Renders the axis for pie charts"""
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if self.options.axis.x.hide or not self.xticks:
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return
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self.xlabels = []
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if self.debug:
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px = max(cx.device_to_user_distance(1, 1))
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cx.set_source_rgba(0, 0, 1, 0.5)
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for x, y, w, h in self.layout.ticks:
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cx.rectangle(x, y, w, h)
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cx.stroke()
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cx.arc(x + w / 2.0, y + h / 2.0, 5 * px, 0, 2 * math.pi)
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cx.fill()
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cx.arc(x, y, 2 * px, 0, 2 * math.pi)
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cx.fill()
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cx.select_font_face(self.options.axis.tickFont,
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cairo.FONT_SLANT_NORMAL,
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cairo.FONT_WEIGHT_NORMAL)
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cx.set_font_size(self.options.axis.tickFontSize)
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cx.set_source_rgb(*hex2rgb(self.options.axis.labelColor))
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for i, tick in enumerate(self.xticks):
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label = tick[1]
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x, y, w, h = self.layout.ticks[i]
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xb, yb, width, height, xa, ya = cx.text_extents(label)
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# draw label with text tick[1]
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cx.move_to(x - xb, y - yb)
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cx.show_text(label)
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self.xlabels.append(label)
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class Slice(object):
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def __init__(self, name, fraction, xval, yval, angle):
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self.name = name
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self.fraction = fraction
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self.xval = xval
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self.yval = yval
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self.startAngle = 2 * angle * math.pi
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self.endAngle = 2 * (angle + fraction) * math.pi
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def __str__(self):
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return ("<pycha.pie.Slice from %.2f to %.2f (%.2f%%)>" %
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(self.startAngle, self.endAngle, self.fraction))
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def isBigEnough(self):
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return abs(self.startAngle - self.endAngle) > 0.001
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def draw(self, cx, centerx, centery, radius):
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cx.new_path()
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cx.move_to(centerx, centery)
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cx.arc(centerx, centery, radius, -self.endAngle, -self.startAngle)
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cx.close_path()
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def getNormalisedAngle(self):
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normalisedAngle = (self.startAngle + self.endAngle) / 2
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if normalisedAngle > math.pi * 2:
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normalisedAngle -= math.pi * 2
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elif normalisedAngle < 0:
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normalisedAngle += math.pi * 2
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return normalisedAngle
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class PieLayout(Layout):
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"""Set of chart areas for pie charts"""
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def __init__(self, slices):
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self.slices = slices
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self.title = Area()
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self.chart = Area()
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self.ticks = []
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self.radius = 0
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self._areas = (
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(self.title, (1, 126 / 255.0, 0)), # orange
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(self.chart, (75 / 255.0, 75 / 255.0, 1.0)), # blue
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)
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self._lines = []
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def update(self, cx, options, width, height, xticks, yticks):
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self.title.x = options.padding.left
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self.title.y = options.padding.top
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self.title.w = width - (options.padding.left + options.padding.right)
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self.title.h = get_text_extents(cx,
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options.title,
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options.titleFont,
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options.titleFontSize,
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options.encoding)[1]
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lookup = dict([(slice.xval, slice) for slice in self.slices])
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self.chart.x = self.title.x
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self.chart.y = self.title.y + self.title.h
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self.chart.w = self.title.w
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self.chart.h = height - self.title.h - (options.padding.top
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+ options.padding.bottom)
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centerx = self.chart.x + self.chart.w * 0.5
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centery = self.chart.y + self.chart.h * 0.5
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self.radius = min(self.chart.w / 2.0, self.chart.h / 2.0)
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for tick in xticks:
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slice = lookup.get(tick[0], None)
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width, height = get_text_extents(cx, tick[1],
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options.axis.tickFont,
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options.axis.tickFontSize,
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options.encoding)
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angle = slice.getNormalisedAngle()
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radius = self._get_min_radius(angle, centerx, centery,
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width, height)
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self.radius = min(self.radius, radius)
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# Now that we now the radius we move the ticks as close as we can
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# to the circle
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for i, tick in enumerate(xticks):
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slice = lookup.get(tick[0], None)
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angle = slice.getNormalisedAngle()
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self.ticks[i] = self._get_tick_position(self.radius, angle,
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self.ticks[i],
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centerx, centery)
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def _get_min_radius(self, angle, centerx, centery, width, height):
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min_radius = None
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# precompute some common values
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tan = math.tan(angle)
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half_width = width / 2.0
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half_height = height / 2.0
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offset_x = half_width * tan
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offset_y = half_height / tan
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def intersect_horizontal_line(y):
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return centerx + (centery - y) / tan
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def intersect_vertical_line(x):
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return centery - tan * (x - centerx)
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# computes the intersection between the rect that has
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# that angle with the X axis and the bounding chart box
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if 0.25 * math.pi <= angle < 0.75 * math.pi:
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# intersects with the top rect
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y = self.chart.y
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x = intersect_horizontal_line(y)
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self._lines.append((x, y))
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x1 = x - half_width - offset_y
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self.ticks.append((x1, self.chart.y, width, height))
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min_radius = abs((y + height) - centery)
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elif 0.75 * math.pi <= angle < 1.25 * math.pi:
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# intersects with the left rect
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x = self.chart.x
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y = intersect_vertical_line(x)
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self._lines.append((x, y))
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y1 = y - half_height - offset_x
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self.ticks.append((x, y1, width, height))
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min_radius = abs(centerx - (x + width))
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elif 1.25 * math.pi <= angle < 1.75 * math.pi:
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# intersects with the bottom rect
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y = self.chart.y + self.chart.h
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x = intersect_horizontal_line(y)
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self._lines.append((x, y))
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x1 = x - half_width + offset_y
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self.ticks.append((x1, y - height, width, height))
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min_radius = abs((y - height) - centery)
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else:
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# intersects with the right rect
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x = self.chart.x + self.chart.w
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y = intersect_vertical_line(x)
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self._lines.append((x, y))
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y1 = y - half_height + offset_x
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self.ticks.append((x - width, y1, width, height))
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min_radius = abs((x - width) - centerx)
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return min_radius
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def _get_tick_position(self, radius, angle, tick, centerx, centery):
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text_width, text_height = tick[2:4]
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half_width = text_width / 2.0
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half_height = text_height / 2.0
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if 0 <= angle < 0.5 * math.pi:
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# first quadrant
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k1 = j1 = k2 = 1
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j2 = -1
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elif 0.5 * math.pi <= angle < math.pi:
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# second quadrant
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k1 = k2 = -1
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j1 = j2 = 1
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elif math.pi <= angle < 1.5 * math.pi:
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# third quadrant
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k1 = j1 = k2 = -1
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j2 = 1
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elif 1.5 * math.pi <= angle < 2 * math.pi:
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# fourth quadrant
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k1 = k2 = 1
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j1 = j2 = -1
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cx = radius * math.cos(angle) + k1 * half_width
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cy = radius * math.sin(angle) + j1 * half_height
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radius2 = math.sqrt(cx * cx + cy * cy)
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tan = math.tan(angle)
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x = math.sqrt((radius2 * radius2) / (1 + tan * tan))
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y = tan * x
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x = centerx + k2 * x
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y = centery + j2 * y
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return x - half_width, y - half_height, text_width, text_height
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