Initial Prey Game integration support.

neo/prey/game/physics/Force_Drag.h

@@ -0,0 +1,49 @@
+// Copyright (C) 2004 Id Software, Inc.
+//
+
+#ifndef __FORCE_DRAG_H__
+#define __FORCE_DRAG_H__
+
+/*
+===============================================================================
+
+	Drag force
+
+===============================================================================
+*/
+
+class idForce_Drag : public idForce {
+
+public:
+	CLASS_PROTOTYPE( idForce_Drag );
+
+						idForce_Drag( void );
+	virtual				~idForce_Drag( void );
+						// initialize the drag force
+	void				Init( float damping );
+						// set physics object being dragged
+	void				SetPhysics( idPhysics *physics, int id, const idVec3 &p );
+						// set position to drag towards
+	void				SetDragPosition( const idVec3 &pos );
+						// get the position dragged towards
+	const idVec3 &		GetDragPosition( void ) const;
+						// get the position on the dragged physics object
+	const idVec3		GetDraggedPosition( void ) const;
+
+public: // common force interface
+	virtual void		Evaluate( int time );
+	virtual void		RemovePhysics( const idPhysics *phys );
+
+private:
+
+	// properties
+	float				damping;
+
+	// positioning
+	idPhysics *			physics;		// physics object
+	int					id;				// clip model id of physics object
+	idVec3				p;				// position on clip model
+	idVec3				dragPosition;	// drag towards this position
+};
+
+#endif /* !__FORCE_DRAG_H__ */