2 This file is part of the simulation module of 3dengfx.
4 Copyright (c) 2005 John Tsiombikas <nuclear@siggraph.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 /* Spring, not the season... the one with the -K
23 * Author: John Tsiombikas 2005
29 #include <gfx/animation.hpp>
32 class SpringPoint : public XFormNode {
38 SpringPoint(const Vector3 &pos = Vector3(), bool fixed = false);
40 virtual void set_fixed(bool fixed);
41 virtual bool is_fixed() const;
43 virtual void set_weight(scalar_t weight);
44 virtual scalar_t get_weight() const;
52 scalar_t stiffness; // the k thingy
53 scalar_t length; // the length of the string with no forces acting on it
57 Spring(SpringConn *end1, SpringConn *end2, scalar_t k, scalar_t len);
59 void set_ends(SpringConn *end1, SpringConn *end2);
60 void set_stiffness(scalar_t stiffness);
61 void set_length(scalar_t len);
63 Vector3 calc_force(int end) const;
66 #endif // _SPRING_HPP_