interpPlugins/interpFlat.h

//-
// ===========================================================================
// Copyright 2015 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
// ===========================================================================
//+

// This sample plugin is slightly more complicated that the InterpZero plugin in
// that it makes use of the setSpan() method to perform some setup before evaluation
// begins.  In this case, it stores the starting keyframe value so it can be
// returned for all evaluations.

#include <maya/MFnAnimCurve.h>
#include <maya/MObject.h> 
#include <maya/MPxAnimCurveInterpolator.h>
#include <maya/MTime.h> 
 
//
// Flat animation curve interpolation definition
//
class interpFlat : public MPxAnimCurveInterpolator
{
  public:
                        interpFlat();
                    ~interpFlat() override; 

    // Initialize the interpolator.
        void        initialize(const MObject &animCurve, unsigned int interval) override;

    // Compute an interpolated keyframe value at the given time.
        double      evaluate(const MTime &val) override;

    static  void*       creator();
    
    // Type id
    static  MFnAnimCurve::TangentType id;

  private:
    MObject             fObj;
    unsigned int        fInterval;
};