X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2F3dengfx%2Fsrc%2Fsim%2Fspring.hpp;fp=src%2F3dengfx%2Fsrc%2Fsim%2Fspring.hpp;h=64f9e1d8455e9c2f16ba13c4870a74aa68f0ac44;hb=6e23259dbabaeb1711a2a5ca25b9cb421f693759;hp=0000000000000000000000000000000000000000;hpb=fe068fa879814784c45e0cb2e65dac489e8f5594;p=summerhack

diff --git a/src/3dengfx/src/sim/spring.hpp b/src/3dengfx/src/sim/spring.hpp
new file mode 100644
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+++ b/src/3dengfx/src/sim/spring.hpp
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+/*
+This file is part of the simulation module of 3dengfx.
+
+Copyright (c) 2005 John Tsiombikas <nuclear@siggraph.org>
+
+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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* Spring, not the season... the one with the -K
+ *
+ * Author: John Tsiombikas 2005
+ */
+
+#ifndef _SPRING_HPP_
+#define _SPRING_HPP_
+
+#include <gfx/animation.hpp>
+#include "spring.hpp"
+
+class SpringPoint : public XFormNode {
+public:
+	bool fixed;
+	scalar_t weight;
+	Spring *spr[2];
+
+	SpringPoint(const Vector3 &pos = Vector3(), bool fixed = false);
+
+	virtual void set_fixed(bool fixed);
+	virtual bool is_fixed() const;
+
+	virtual void set_weight(scalar_t weight);
+	virtual scalar_t get_weight() const;
+
+	virtual void calc();
+};
+
+
+class Spring {
+private:
+	scalar_t stiffness;	// the k thingy
+	scalar_t length;	// the length of the string with no forces acting on it
+
+public:
+	Spring();
+	Spring(SpringConn *end1, SpringConn *end2, scalar_t k, scalar_t len);
+
+	void set_ends(SpringConn *end1, SpringConn *end2);
+	void set_stiffness(scalar_t stiffness);
+	void set_length(scalar_t len);
+
+	Vector3 calc_force(int end) const;
+};
+
+#endif	// _SPRING_HPP_