added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / sim / spring.hpp

diff --git a/src/3dengfx/src/sim/spring.hpp b/src/3dengfx/src/sim/spring.hpp
new file mode 100644 (file)
index 0000000..64f9e1d
--- /dev/null
+++ b/src/3dengfx/src/sim/spring.hpp
@@ -0,0 +1,66 @@
+/*
+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_