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# Copyright(c) 2007-2010 by Lorenzo Gil Sanchez <lorenzo.gil.sanchez@gmail.com>
#
# 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/>.
from pycha.chart import Chart
from pycha.color import hex2rgb
class LineChart(Chart):
def __init__(self, surface=None, options={}, debug=False):
super(LineChart, self).__init__(surface, options, debug)
self.points = []
def _updateChart(self):
"""Evaluates measures for line 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 _renderChart(self, cx):
"""Renders a line chart"""
def preparePath(storeName):
cx.new_path()
firstPoint = True
lastX = None
if self.options.shouldFill:
# Go to the (0,0) coordinate to start drawing the area
#cx.move_to(self.layout.chart.x,
# self.layout.chart.y + self.layout.chart.h)
offset = (1.0 - self.origin) * self.layout.chart.h
cx.move_to(self.layout.chart.x, self.layout.chart.y + offset)
for point in self.points:
if point.name == storeName:
if not self.options.shouldFill and firstPoint:
# starts the first point of the line
cx.move_to(point.x * self.layout.chart.w
+ self.layout.chart.x,
point.y * self.layout.chart.h
+ self.layout.chart.y)
firstPoint = False
continue
cx.line_to(point.x * self.layout.chart.w
+ self.layout.chart.x,
point.y * self.layout.chart.h
+ self.layout.chart.y)
# we remember the last X coordinate to close the area
# properly. See bug #4
lastX = point.x
if self.options.shouldFill:
# Close the path to the start point
y = ((1.0 - self.origin) * self.layout.chart.h
+ self.layout.chart.y)
cx.line_to(lastX * self.layout.chart.w
+ self.layout.chart.x, y)
cx.line_to(self.layout.chart.x, y)
cx.close_path()
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()
class Point(object):
def __init__(self, x, y, xval, yval, name):
self.x, self.y = x, y
self.xval, self.yval = xval, yval
self.name = name
def __str__(self):
return "<pycha.line.Point@(%.2f, %.2f)>" % (self.x, self.y)
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