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130 lines
4.7 KiB
130 lines
4.7 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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from pycha.chart import Chart
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from pycha.color import hex2rgb
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class LineChart(Chart):
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def __init__(self, surface=None, options={}, debug=False):
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super(LineChart, self).__init__(surface, options, debug)
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self.points = []
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def _updateChart(self):
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"""Evaluates measures for line charts"""
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self.points = []
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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
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y = 1.0 - (yval - self.minyval) * self.yscale
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point = Point(x, y, xval, yval, name)
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if 0.0 <= point.x <= 1.0 and 0.0 <= point.y <= 1.0:
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self.points.append(point)
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def _renderChart(self, cx):
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"""Renders a line chart"""
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def preparePath(storeName):
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cx.new_path()
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firstPoint = True
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lastX = None
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if self.options.shouldFill:
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# Go to the (0,0) coordinate to start drawing the area
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#cx.move_to(self.layout.chart.x,
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# self.layout.chart.y + self.layout.chart.h)
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offset = (1.0 - self.origin) * self.layout.chart.h
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cx.move_to(self.layout.chart.x, self.layout.chart.y + offset)
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for point in self.points:
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if point.name == storeName:
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if not self.options.shouldFill and firstPoint:
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# starts the first point of the line
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cx.move_to(point.x * self.layout.chart.w
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+ self.layout.chart.x,
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point.y * self.layout.chart.h
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+ self.layout.chart.y)
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firstPoint = False
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continue
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cx.line_to(point.x * self.layout.chart.w
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+ self.layout.chart.x,
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point.y * self.layout.chart.h
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+ self.layout.chart.y)
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# we remember the last X coordinate to close the area
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# properly. See bug #4
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lastX = point.x
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if self.options.shouldFill:
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# Close the path to the start point
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y = ((1.0 - self.origin) * self.layout.chart.h
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+ self.layout.chart.y)
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cx.line_to(lastX * self.layout.chart.w
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+ self.layout.chart.x, y)
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cx.line_to(self.layout.chart.x, y)
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cx.close_path()
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else:
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cx.set_source_rgb(*self.colorScheme[storeName])
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cx.stroke()
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cx.save()
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cx.set_line_width(self.options.stroke.width)
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if self.options.shouldFill:
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def drawLine(storeName):
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if self.options.stroke.shadow:
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# draw shadow
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cx.save()
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cx.set_source_rgba(0, 0, 0, 0.15)
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cx.translate(2, -2)
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preparePath(storeName)
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cx.fill()
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cx.restore()
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# fill the line
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cx.set_source_rgb(*self.colorScheme[storeName])
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preparePath(storeName)
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cx.fill()
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if not self.options.stroke.hide:
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# draw stroke
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cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
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preparePath(storeName)
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cx.stroke()
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# draw the lines
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for key in self._getDatasetsKeys():
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drawLine(key)
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else:
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for key in self._getDatasetsKeys():
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preparePath(key)
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cx.restore()
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class Point(object):
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def __init__(self, x, y, xval, yval, name):
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self.x, self.y = x, y
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self.xval, self.yval = xval, yval
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self.name = name
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def __str__(self):
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return "<pycha.line.Point@(%.2f, %.2f)>" % (self.x, self.y)
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