interpPlugins/interpHalf.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 shows how to allow the interpolator to perform its own
// evaluations at the keyframe time locations, allowing the curve to not pass
// through the keyframe values.  In this example, the curve is linearly
// interpolated to values halfway between the keyframe values and the keyframe
// values in the neighboring spans.

#include <maya/MFnAnimCurve.h>
#include <maya/MObject.h>
#include <maya/MPxAnimCurveInterpolator.h>
#include <maya/MTime.h> 
 
//
// Halfwise linear curve interpolation definition
//
class interpHalf : public MPxAnimCurveInterpolator
{
  public:
                        interpHalf();
                    ~interpHalf() 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:
    double              sTime;
    double              range;
    double              beforeVal;
    double              afterVal;
};