/home/master/UCL/VisualizationLibrary/src/vlCore/LinearInterpolator.hpp

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#ifndef LinearInterpolator_INCLUDE_ONCE
#define LinearInterpolator_INCLUDE_ONCE

#include <vlCore/Interpolator.hpp>

namespace vl
{
  template<typename T>
  class LinearInterpolator: public Object
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolator<typename T>, Object)

  public:
    LinearInterpolator() 
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }

    LinearInterpolator(const std::vector<T>& path): mPath(path) {}

    T computePoint(float t) const
    {
      t = clamp(t,0.0f,1.0f);
      if (t == 0.0f)
        return mPath[0];
      if (t == 1.0f)
        return mPath.back();
      int p0 = int((mPath.size()-1)*t);
      int p1 = p0+1;
      if (p1 > (int)mPath.size()-1)
        p1 = (int)mPath.size()-1;
      float tt = (mPath.size()-1)*t - p0/*int((mPath.size()-1)*t)*/;
      return mPath[p0]*(1.0f-tt) + mPath[p1]*tt;
    }

    void setPath(const std::vector<T>& path) { mPath = path; }
    const std::vector<T>& path() const { return mPath; }
    std::vector<T>& path() { return mPath; }

  protected:
    std::vector<T> mPath;
    std::vector<T> mLinearSpline;
  };

  typedef LinearInterpolator<float>     LinearInterpolatorFloat_T;
  typedef LinearInterpolator<fvec2> LinearInterpolatorFVec2_T;
  typedef LinearInterpolator<fvec3> LinearInterpolatorFVec3_T;
  typedef LinearInterpolator<fvec4> LinearInterpolatorFVec4_T;
  typedef LinearInterpolator<double>    LinearInterpolatorDouble_T;
  typedef LinearInterpolator<dvec2> LinearInterpolatorDVec2_T;
  typedef LinearInterpolator<dvec3> LinearInterpolatorDVec3_T;
  typedef LinearInterpolator<dvec4> LinearInterpolatorDVec4_T;

  class LinearInterpolatorFVec4: public InterpolatorFVec4
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorFVec4, InterpolatorFVec4)
  public:
    LinearInterpolatorFVec4(): mInterpolator( new LinearInterpolatorFVec4_T ) {}
    LinearInterpolatorFVec4(const std::vector<fvec4>& path): mInterpolator( new LinearInterpolatorFVec4_T(path) ) {}
    fvec4 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorFVec4_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorFVec4_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorFVec4_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorFVec4_T> mInterpolator;
  };
  class LinearInterpolatorFVec3: public InterpolatorFVec3
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorFVec3, InterpolatorFVec3)
  public:
    LinearInterpolatorFVec3(): mInterpolator( new LinearInterpolatorFVec3_T ) {}
    LinearInterpolatorFVec3(const std::vector<fvec3>& path): mInterpolator( new LinearInterpolatorFVec3_T(path) ) {}
    fvec3 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorFVec3_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorFVec3_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorFVec3_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorFVec3_T> mInterpolator;
  };
  class LinearInterpolatorFVec2: public InterpolatorFVec2
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorFVec2, InterpolatorFVec2)
  public:
    LinearInterpolatorFVec2(): mInterpolator( new LinearInterpolatorFVec2_T ) {}
    LinearInterpolatorFVec2(const std::vector<fvec2>& path): mInterpolator( new LinearInterpolatorFVec2_T(path) ) {}
    fvec2 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorFVec2_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorFVec2_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorFVec2_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorFVec2_T> mInterpolator;
  };
  class LinearInterpolatorFloat: public InterpolatorFloat
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorFloat, InterpolatorFloat)
  public:
    LinearInterpolatorFloat(): mInterpolator( new LinearInterpolatorFloat_T ) {}
    LinearInterpolatorFloat(const std::vector<float>& path): mInterpolator( new LinearInterpolatorFloat_T(path) ) {}
    float computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorFloat_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorFloat_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorFloat_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorFloat_T> mInterpolator;
  };
  class LinearInterpolatorDVec4: public InterpolatorDVec4
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorDVec4, InterpolatorDVec4)
  public:
    LinearInterpolatorDVec4(): mInterpolator( new LinearInterpolatorDVec4_T ) {}
    LinearInterpolatorDVec4(const std::vector<dvec4>& path): mInterpolator( new LinearInterpolatorDVec4_T(path) ) {}
    dvec4 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorDVec4_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorDVec4_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorDVec4_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorDVec4_T> mInterpolator;
  };
  class LinearInterpolatorDVec3: public InterpolatorDVec3
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorDVec3, InterpolatorDVec3)
  public:
    LinearInterpolatorDVec3(): mInterpolator( new LinearInterpolatorDVec3_T ) {}
    LinearInterpolatorDVec3(const std::vector<dvec3>& path): mInterpolator( new LinearInterpolatorDVec3_T(path) ) {}
    dvec3 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorDVec3_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorDVec3_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorDVec3_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorDVec3_T> mInterpolator;
  };
  class LinearInterpolatorDVec2: public InterpolatorDVec2
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorDVec2, InterpolatorDVec2)
  public:
    LinearInterpolatorDVec2(): mInterpolator( new LinearInterpolatorDVec2_T ) {}
    LinearInterpolatorDVec2(const std::vector<dvec2>& path): mInterpolator( new LinearInterpolatorDVec2_T(path) ) {}
    dvec2 computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorDVec2_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorDVec2_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorDVec2_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorDVec2_T> mInterpolator;
  };
  class LinearInterpolatorDouble: public InterpolatorDouble
  {
    VL_INSTRUMENT_CLASS(vl::LinearInterpolatorDouble, InterpolatorDouble)
  public:
    LinearInterpolatorDouble(): mInterpolator( new LinearInterpolatorDouble_T ) {}
    LinearInterpolatorDouble(const std::vector<double>& path): mInterpolator( new LinearInterpolatorDouble_T(path) ) {}
    double computePoint(float t) const { return interpolator()->computePoint(t); }
    LinearInterpolatorDouble_T* interpolator() { return mInterpolator.get(); }
    const LinearInterpolatorDouble_T* interpolator() const { return mInterpolator.get(); }
    void setInterpolator(LinearInterpolatorDouble_T* interpolator) { mInterpolator = interpolator; }
  protected:
    ref<LinearInterpolatorDouble_T> mInterpolator;
  };
}

#endif