GU/GU_Spring.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 */

#ifndef __GU_Spring_h__
#define __GU_Spring_h__

#include "GU_API.h"
#include <UT/UT_PtrArray.h>
#include <GEO/GEO_Detail.h>
#include "GU_Topology.h"

class GU_SpringEdge;

class GU_API GU_Spring 
{
public:

             GU_Spring (void);
    virtual ~GU_Spring (void);

    void        setupEdges      (GU_Detail *gdp, GB_PrimitiveGroup *group = 0,
                                 int force = 0);
    void        computeEdges    (GU_Detail *gdp, int behavior, 
                                 float tension = 1.0f, int tensionoffset = -1,
                                 int veloffset = -1, float timeinc = 0);
    void        getForce        (UT_Vector3& force, const GEO_Point *ppt,
                                 float springk = 1.0f, int springkoffset = -1);

private:

    UT_PtrArray<GU_SpringEdge*>         edges;
    GU_Topology                         topology;

    void        cleanEdges      (void);
    void        buildEdges      (GEO_Primitive *prim);

};

#endif

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