root/tags/0.4.1/examples/scatterchart.py

# Copyright (c) 2007-2008 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/>.

import random
import sys

import cairo

import pycha.scatter

from lines import lines

def scatterplotChart(output):
    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 200)


    dataSet = (
        ('points', [(i, random.random() * 100.0) for i in range(100)]),
        )

    options = {
        'background': {
            'color': '#eeeeff',
            'lineColor': '#444444'
        },
        'colorScheme': 'blue',
        'legend': {
            'hide': True,
        },
        'padding': {
            'left': 55
        }
    }
    chart = pycha.scatter.ScatterplotChart(surface, options)

    chart.addDataset(dataSet)
    chart.render()

    surface.write_to_png(output)

if __name__ == '__main__':
    output = sys.argv[1] if len(sys.argv) > 1 else 'scatterchart.png'
    scatterplotChart(output)