SIM_ConAnchorAlignAxis.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.
 *
 */

#ifndef __SIM_ConAnchorAlignAxis_h__
#define __SIM_ConAnchorAlignAxis_h__

#include "SIM_API.h"
#include "SIM_ConAnchorRotational.h"

class SIM_ConAnchorSpatial;

/// A concrete constraint source: the "lookat" constraint, set to
/// track the orientation from one spatial anchor to another.
class SIM_API SIM_ConAnchorAlignAxis : public SIM_ConAnchorRotational
{
public:
    GETSET_DATA_FUNCS_V3(SIM_NAME_OBJECTAXIS, ObjectAxis);

protected:
    explicit             SIM_ConAnchorAlignAxis(const SIM_DataFactory *factory);
                        ~SIM_ConAnchorAlignAxis() override;

    bool                 getNeedsInitSubclass() const override;
    void                 initConstraintSubclass(
                                        const SIM_Relationship *rel) override;

    UT_Quaternion        getOrientationSubclass(
                                        const SIM_Time &time) const override;
    UT_Vector3           getAngularVelocitySubclass(
                                        const SIM_Time &time) const override;
    
private:
    void                 getPositions(
                                SIM_ConAnchorSpatial *&goalfrom,
                                SIM_ConAnchorSpatial *&goalto);
    void                 getConstPositions(
                                const SIM_ConAnchorSpatial *&goalfrom,
                                const SIM_ConAnchorSpatial *&goalto) const;

    static const SIM_DopDescription     *getDopDescription();

    DECLARE_STANDARD_GETCASTTOTYPE();
    DECLARE_DATAFACTORY(SIM_ConAnchorAlignAxis,
                        SIM_ConAnchorRotational,
                        "Anchor: Align Axis",
                        getDopDescription());
};

#endif