/usr/share/pyshared/pycha/radial.py is in python-pycha 0.7.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of PyCha.
#
# PyCha is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# PyCha is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PyCha. If not, see <http://www.gnu.org/licenses/>.
import math
import cairo
from pycha.chart import Chart
from pycha.line import Point
from pycha.color import hex2rgb
from pycha.utils import safe_unicode
class RadialChart(Chart):
def __init__(self, surface=None, options={}):
super(RadialChart, self).__init__(surface, options)
self.points = []
def _updateChart(self):
"""Evaluates measures for radial charts"""
self.points = []
for i, (name, store) in enumerate(self.datasets):
for item in store:
xval, yval = item
x = (xval - self.minxval) * self.xscale
y = 1.0 - (yval - self.minyval) * self.yscale
point = Point(x, y, xval, yval, name)
if 0.0 <= point.x <= 1.0 and 0.0 <= point.y <= 1.0:
self.points.append(point)
def _renderBackground(self, cx):
"""Renders the background area of the chart"""
if self.options.background.hide:
return
cx.save()
if self.options.background.baseColor:
cx.set_source_rgb(*hex2rgb(self.options.background.baseColor))
cx.paint()
if self.options.background.chartColor:
cx.set_source_rgb(*hex2rgb(self.options.background.chartColor))
cx.set_line_width(10.0)
cx.arc(self.layout.chart.x + self.layout.chart.w / 2,
self.layout.chart.y + self.layout.chart.h / 2,
min(self.layout.chart.w / 2, self.layout.chart.h / 2),
0, 2 * math.pi)
cx.fill()
if self.options.background.lineColor:
cx.set_source_rgb(*hex2rgb(self.options.background.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
self._renderLines(cx)
cx.restore()
def _renderLine(self, cx, tick, horiz):
"""Aux function for _renderLines"""
rad = (self.layout.chart.h / 2) * (1 - tick[0])
cx.arc(self.layout.chart.x + self.layout.chart.w / 2,
self.layout.chart.y + self.layout.chart.h / 2,
rad, 0, 2 * math.pi)
cx.stroke()
def _renderXAxis(self, cx):
"""Draws the horizontal line representing the X axis"""
count = len(self.xticks)
centerx = self.layout.chart.x + self.layout.chart.w / 2
centery = self.layout.chart.y + self.layout.chart.h / 2
for i in range(0, count):
offset1 = i * 2 * math.pi / count
offset = math.pi / 2 - offset1
rad = self.layout.chart.h / 2
(r1, r2) = (0, rad + 5)
x1 = centerx - math.cos(offset) * r1
x2 = centerx - math.cos(offset) * r2
y1 = centery - math.sin(offset) * r1
y2 = centery - math.sin(offset) * r2
cx.new_path()
cx.move_to(x1, y1)
cx.line_to(x2, y2)
cx.close_path()
cx.stroke()
def _renderYTick(self, cx, tick, center):
"""Aux method for _renderAxis"""
i = tick
tick = self.yticks[i]
count = len(self.yticks)
if callable(tick):
return
x = center[0]
y = center[1] - i * (self.layout.chart.h / 2) / count
cx.new_path()
cx.move_to(x, y)
cx.line_to(x - self.options.axis.tickSize, y)
cx.close_path()
cx.stroke()
cx.select_font_face(self.options.axis.tickFont,
cairo.FONT_SLANT_NORMAL,
cairo.FONT_WEIGHT_NORMAL)
cx.set_font_size(self.options.axis.tickFontSize)
label = safe_unicode(tick[1], self.options.encoding)
extents = cx.text_extents(label)
labelWidth = extents[2]
labelHeight = extents[3]
if self.options.axis.y.rotate:
radians = math.radians(self.options.axis.y.rotate)
cx.move_to(x - self.options.axis.tickSize
- (labelWidth * math.cos(radians))
- 4,
y + (labelWidth * math.sin(radians))
+ labelHeight / (2.0 / math.cos(radians)))
cx.rotate(-radians)
cx.show_text(label)
cx.rotate(radians) # this is probably faster than a save/restore
else:
cx.move_to(x - self.options.axis.tickSize - labelWidth - 4,
y + labelHeight / 2.0)
cx.rel_move_to(0.0, -labelHeight / 2.0)
cx.show_text(label)
return label
def _renderYAxis(self, cx):
"""Draws the vertical line for the Y axis"""
centerx = self.layout.chart.x + self.layout.chart.w / 2
centery = self.layout.chart.y + self.layout.chart.h / 2
offset = math.pi / 2
r1 = self.layout.chart.h / 2
x1 = centerx - math.cos(offset) * r1
y1 = centery - math.sin(offset) * r1
cx.new_path()
cx.move_to(centerx, centery)
cx.line_to(x1, y1)
cx.close_path()
cx.stroke()
def _renderAxis(self, cx):
"""Renders axis"""
if self.options.axis.x.hide and self.options.axis.y.hide:
return
cx.save()
cx.set_source_rgb(*hex2rgb(self.options.axis.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
centerx = self.layout.chart.x + self.layout.chart.w / 2
centery = self.layout.chart.y + self.layout.chart.h / 2
if not self.options.axis.y.hide:
if self.yticks:
count = len(self.yticks)
for i in range(0, count):
self._renderYTick(cx, i, (centerx, centery))
if self.options.axis.y.label:
self._renderYAxisLabel(cx, self.options.axis.y.label)
self._renderYAxis(cx)
if not self.options.axis.x.hide:
fontAscent = cx.font_extents()[0]
if self.xticks:
count = len(self.xticks)
for i in range(0, count):
self._renderXTick(cx, i, fontAscent, (centerx, centery))
if self.options.axis.x.label:
self._renderXAxisLabel(cx, self.options.axis.x.label)
self._renderXAxis(cx)
cx.restore()
def _renderXTick(self, cx, i, fontAscent, center):
tick = self.xticks[i]
if callable(tick):
return
count = len(self.xticks)
cx.select_font_face(self.options.axis.tickFont,
cairo.FONT_SLANT_NORMAL,
cairo.FONT_WEIGHT_NORMAL)
cx.set_font_size(self.options.axis.tickFontSize)
label = safe_unicode(tick[1], self.options.encoding)
extents = cx.text_extents(label)
labelWidth = extents[2]
labelHeight = extents[3]
x, y = center
cx.move_to(x, y)
if self.options.axis.x.rotate:
radians = math.radians(self.options.axis.x.rotate)
cx.move_to(x - (labelHeight * math.cos(radians)),
y + self.options.axis.tickSize
+ (labelHeight * math.cos(radians))
+ 4.0)
cx.rotate(radians)
cx.show_text(label)
cx.rotate(-radians)
else:
offset1 = i * 2 * math.pi / count
offset = math.pi / 2 - offset1
rad = self.layout.chart.h / 2 + 10
x = center[0] - math.cos(offset) * rad
y = center[1] - math.sin(offset) * rad
cx.move_to(x, y)
cx.rotate(offset - math.pi / 2)
if math.sin(offset) < 0.0:
cx.rotate(math.pi)
cx.rel_move_to(0.0, 5.0)
cx.rel_move_to(-labelWidth / 2.0, 0)
cx.show_text(label)
if math.sin(offset) < 0.0:
cx.rotate(-math.pi)
cx.rotate(-(offset - math.pi / 2))
return label
def _renderChart(self, cx):
"""Renders a line chart"""
# draw the circle
def preparePath(storeName):
cx.new_path()
firstPoint = True
count = len(self.points) / len(self.datasets)
centerx = self.layout.chart.x + self.layout.chart.w / 2
centery = self.layout.chart.y + self.layout.chart.h / 2
firstPointCoord = None
for index, point in enumerate(self.points):
if point.name == storeName:
offset1 = index * 2 * math.pi / count
offset = math.pi / 2 - offset1
rad = (self.layout.chart.h / 2) * (1 - point.y)
x = centerx - math.cos(offset) * rad
y = centery - math.sin(offset) * rad
if firstPointCoord is None:
firstPointCoord = (x, y)
if not self.options.shouldFill and firstPoint:
# starts the first point of the line
cx.move_to(x, y)
firstPoint = False
continue
cx.line_to(x, y)
if not firstPointCoord is None:
cx.line_to(firstPointCoord[0], firstPointCoord[1])
if self.options.shouldFill:
# Close the path to the start point
y = ((1.0 - self.origin)
* self.layout.chart.h + self.layout.chart.y)
else:
cx.set_source_rgb(*self.colorScheme[storeName])
cx.stroke()
cx.save()
cx.set_line_width(self.options.stroke.width)
if self.options.shouldFill:
def drawLine(storeName):
if self.options.stroke.shadow:
# draw shadow
cx.save()
cx.set_source_rgba(0, 0, 0, 0.15)
cx.translate(2, -2)
preparePath(storeName)
cx.fill()
cx.restore()
# fill the line
cx.set_source_rgb(*self.colorScheme[storeName])
preparePath(storeName)
cx.fill()
if not self.options.stroke.hide:
# draw stroke
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
preparePath(storeName)
cx.stroke()
# draw the lines
for key in self._getDatasetsKeys():
drawLine(key)
else:
for key in self._getDatasetsKeys():
preparePath(key)
cx.restore()
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