80 lines
2.6 KiB
Python
80 lines
2.6 KiB
Python
#
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# Gramps - a GTK+/GNOME based genealogy program
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#
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# Copyright (C) 2001-2007 Donald N. Allingham, Martin Hawlisch
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# Copyright (C) 2009 Douglas S. Blank
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# Copyright (C) 2012 Benny Malengier
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# Copyright (C) 2013 Vassilii Khachaturov
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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#-------------------------------------------------------------------------
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#
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# Python modules
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#
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#-------------------------------------------------------------------------
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#from gi.repository import Pango
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#from gi.repository import GObject
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#from gi.repository import Gdk
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#from gi.repository import Gtk
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#from gi.repository import PangoCairo
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import cairo
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#import math
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#import colorsys
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#import pickle
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#-------------------------------------------------------------------------
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#
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# Functions
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#
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#-------------------------------------------------------------------------
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def warpPath(ctx, function):
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"""Transform a path given a 2D transformation function.
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ctx -- a cairo.Context, on which the path is set
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function -- a 2D transform (x,y) |-> (x_new,y_new)
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The transformed path replaces the original one on the context.
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Taken from /usr/share/doc/python-cairo/examples/warpedtext.py
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According to /usr/share/doc/python-cairo/copyright, licensed
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under MOZILLA PUBLIC LICENSE 1.1, see that file for more detail.
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"""
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first = True
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for type, points in ctx.copy_path():
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if type == cairo.PATH_MOVE_TO:
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if first:
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ctx.new_path()
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first = False
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x, y = function(*points)
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ctx.move_to(x, y)
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elif type == cairo.PATH_LINE_TO:
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x, y = function(*points)
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ctx.line_to(x, y)
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elif type == cairo.PATH_CURVE_TO:
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x1, y1, x2, y2, x3, y3 = points
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x1, y1 = function(x1, y1)
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x2, y2 = function(x2, y2)
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x3, y3 = function(x3, y3)
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ctx.curve_to(x1, y1, x2, y2, x3, y3)
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elif type == cairo.PATH_CLOSE_PATH:
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ctx.close_path()
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