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Diffstat (limited to 'src/3rdparty/2geom/include/2geom/bezier-utils.h')
| -rw-r--r-- | src/3rdparty/2geom/include/2geom/bezier-utils.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/3rdparty/2geom/include/2geom/bezier-utils.h b/src/3rdparty/2geom/include/2geom/bezier-utils.h new file mode 100644 index 0000000..3e56e6e --- /dev/null +++ b/src/3rdparty/2geom/include/2geom/bezier-utils.h @@ -0,0 +1,99 @@ +/** + * \file + * \brief Bezier fitting algorithms + *//* + * An Algorithm for Automatically Fitting Digitized Curves + * by Philip J. Schneider + * from "Graphics Gems", Academic Press, 1990 + * + * Authors: + * Philip J. Schneider + * Lauris Kaplinski <lauris@ximian.com> + * + * Copyright (C) 1990 Philip J. Schneider + * Copyright (C) 2001 Lauris Kaplinski and Ximian, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + * + */ + +#ifndef LIB2GEOM_SEEN_BEZIER_UTILS_H +#define LIB2GEOM_SEEN_BEZIER_UTILS_H + +#include <2geom/point.h> + +namespace Geom { + +Point bezier_pt(unsigned degree, Point const V[], double t); + +int bezier_fit_cubic(Point bezier[], Point const data[], int len, double error); + +int bezier_fit_cubic_r(Point bezier[], Point const data[], int len, double error, + unsigned max_beziers); + +int bezier_fit_cubic_full(Point bezier[], int split_points[], Point const data[], int len, + Point const &tHat1, Point const &tHat2, + double error, unsigned max_beziers); + +Point darray_left_tangent(Point const d[], unsigned const len); +Point darray_left_tangent(Point const d[], unsigned const len, double const tolerance_sq); +Point darray_right_tangent(Point const d[], unsigned const length, double const tolerance_sq); + +template <typename iterator> +static void +cubic_bezier_poly_coeff(iterator b, Point *pc) { + double c[10] = {1, + -3, 3, + 3, -6, 3, + -1, 3, -3, 1}; + + int cp = 0; + + for(int i = 0; i < 4; i++) { + pc[i] = Point(0,0); + ++b; + } + for(int i = 0; i < 4; i++) { + --b; + for(int j = 0; j <= i; j++) { + pc[3 - j] += c[cp]*(*b); + cp++; + } + } +} + +} // end namespace Geom + +#endif // LIB2GEOM_SEEN_BEZIER_UTILS_H + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |