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Diffstat (limited to 'pygtk_chart/basics.py')
| -rw-r--r-- | pygtk_chart/basics.py | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/pygtk_chart/basics.py b/pygtk_chart/basics.py new file mode 100644 index 0000000..5fdcd10 --- /dev/null +++ b/pygtk_chart/basics.py @@ -0,0 +1,133 @@ +#!/usr/bin/env python +# +# misc.py +# +# Copyright 2008 Sven Festersen <sven@sven-festersen.de> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, +# MA 02110-1301, USA. +""" +This module contains simple functions needed by all other modules. + +Author: Sven Festersen (sven@sven-festersen.de) +""" +__docformat__ = "epytext" +import cairo +import gtk +import os + +import pygtk_chart + +def is_in_range(x, (xmin, xmax)): + """ + Use this method to test whether M{xmin <= x <= xmax}. + + @type x: number + @type xmin: number + @type xmax: number + """ + return (xmin <= x and xmax >= x) + +def intersect_ranges(range_a, range_b): + min_a, max_a = range_a + min_b, max_b = range_b + return max(min_a, min_b), min(max_a, max_b) + +def get_center(rect): + """ + Find the center point of a rectangle. + + @type rect: gtk.gdk.Rectangle + @param rect: The rectangle. + @return: A (x, y) tuple specifying the center point. + """ + return rect.width / 2, rect.height / 2 + +def color_gdk_to_cairo(color): + """ + Convert a gtk.gdk.Color to cairo color. + + @type color: gtk.gdk.Color + @param color: the color to convert + @return: a color in cairo format. + """ + return (color.red / 65535.0, color.green / 65535.0, color.blue / 65535.0) + +def color_cairo_to_gdk(r, g, b): + return gtk.gdk.Color(int(65535 * r), int(65535 * g), int(65535 * b)) + +def color_rgb_to_cairo(color): + """ + Convert a 8 bit RGB value to cairo color. + + @type color: a triple of integers between 0 and 255 + @param color: The color to convert. + @return: A color in cairo format. + """ + return (color[0] / 255.0, color[1] / 255.0, color[2] / 255.0) + +def color_html_to_cairo(color): + """ + Convert a html (hex) RGB value to cairo color. + + @type color: html color string + @param color: The color to convert. + @return: A color in cairo format. + """ + if color[0] == '#': + color = color[1:] + (r, g, b) = (int(color[:2], 16), + int(color[2:4], 16), + int(color[4:], 16)) + return color_rgb_to_cairo((r, g, b)) + +def color_list_from_file(filename): + """ + Read a file with one html hex color per line and return a list + of cairo colors. + """ + result = [] + if os.path.exists(filename): + f = open(filename, "r") + for line in f.readlines(): + line = line.strip() + result.append(color_html_to_cairo(line)) + return result + +def gdk_color_list_from_file(filename): + """ + Read a file with one html hex color per line and return a list + of gdk colors. + """ + result = [] + if os.path.exists(filename): + f = open(filename, "r") + for line in f.readlines(): + line = line.strip() + result.append(gtk.gdk.color_parse(line)) + return result + +def set_context_line_style(context, style): + """ + The the line style for a context. + """ + if style == pygtk_chart.LINE_STYLE_SOLID: + context.set_dash([]) + elif style == pygtk_chart.LINE_STYLE_DASHED: + context.set_dash([5]) + elif style == pygtk_chart.LINE_STYLE_DASHED_ASYMMETRIC: + context.set_dash([6, 6, 2, 6]) + elif style == pygtk_chart.LINE_STYLE_DOTTED: + context.set_dash([1]) |