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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.1 (2010/10/01)
#include "Wm5MathematicsPCH.h"
#include "Wm5IntpBSplineUniform2.h"
#include "Wm5Math.h"
namespace Wm5
{
//----------------------------------------------------------------------------
template <typename Real>
IntpBSplineUniform2<Real>::IntpBSplineUniform2 (int degree, const int* dim,
Real* data)
:
IntpBSplineUniform<Real>(2, degree, dim, data)
{
}
//----------------------------------------------------------------------------
template <typename Real>
int IntpBSplineUniform2<Real>::Index (int ix, int iy) const
{
return ix + mDim[0]*iy;
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntpBSplineUniform2<Real>::operator() (Real* X)
{
return (*this)(X[0], X[1]);
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntpBSplineUniform2<Real>::operator() (int* dx, Real* X)
{
return (*this)(dx[0], dx[1], X[0], X[1]);
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntpBSplineUniform2<Real>::operator() (Real x, Real y)
{
mBase[0] = (int)Math<Real>::Floor(x);
mBase[1] = (int)Math<Real>::Floor(y);
for (int dim = 0; dim < 2; ++dim)
{
if (mOldBase[dim] != mBase[dim])
{
// Switch to new local grid.
for (int k = 0; k < 2; ++k)
{
mOldBase[k] = mBase[k];
mGridMin[k] = mBase[k] - 1;
mGridMax[k] = mGridMin[k] + mDegree;
}
// Fill in missing grid data if necessary.
if (mEvaluateCallback)
{
EvaluateUnknownData();
}
ComputeIntermediate();
break;
}
}
SetPolynomial(0, x - mBase[0], mPoly[0]);
SetPolynomial(0, y - mBase[1], mPoly[1]);
int index[2] = { 0, 0 };
Real result = (Real)0;
for (int k = index[0] + mDp1*index[1]; k < mDp1ToN; ++k)
{
result += mPoly[0][index[0]]*mPoly[1][index[1]]*mInter[k];
if (++index[0] <= mDegree)
{
continue;
}
index[0] = 0;
index[1]++;
}
return result;
}
//----------------------------------------------------------------------------
template <typename Real>
Real IntpBSplineUniform2<Real>::operator() (int dx, int dy, Real x, Real y)
{
mBase[0] = (int)Math<Real>::Floor(x);
mBase[1] = (int)Math<Real>::Floor(y);
for (int dim = 0; dim < 2; ++dim)
{
if (mOldBase[dim] != mBase[dim])
{
// Switch to new local grid.
for (int k = 0; k < 2; ++k)
{
mOldBase[k] = mBase[k];
mGridMin[k] = mBase[k] - 1;
mGridMax[k] = mGridMin[k] + mDegree;
}
// Fill in missing grid data if necessary.
if (mEvaluateCallback)
{
EvaluateUnknownData();
}
ComputeIntermediate();
break;
}
}
SetPolynomial(dx, x - mBase[0], mPoly[0]);
SetPolynomial(dy, y - mBase[1], mPoly[1]);
int index[2] = { dx, dy };
int incr1 = dx;
Real result = (Real)0.0;
for (int k = index[0] + mDp1*index[1]; k < mDp1ToN; ++k)
{
result += mPoly[0][index[0]]*mPoly[1][index[1]]*mInter[k];
if (++index[0] <= mDegree)
{
continue;
}
index[0] = dx;
k += incr1;
index[1]++;
}
return result;
}
//----------------------------------------------------------------------------
template <typename Real>
void IntpBSplineUniform2<Real>::EvaluateUnknownData ()
{
for (int k1 = mGridMin[1]; k1 <= mGridMax[1]; ++k1)
{
for (int k0 = mGridMin[0]; k0 <= mGridMax[0]; ++k0)
{
int index = Index(k0, k1);
if (mData[index] == Math<Real>::MAX_REAL)
{
mData[index] = mEvaluateCallback(index);
}
}
}
}
//----------------------------------------------------------------------------
template <typename Real>
void IntpBSplineUniform2<Real>::ComputeIntermediate ()
{
// Fetch subblock of data to cache.
int delta0 = mDim[0] - mDp1;
int loop[2];
for (int dim = 0; dim < 2; ++dim)
{
loop[dim] = mGridMin[dim];
}
int index = Index(loop[0], loop[1]);
int k;
for (k = 0; k < mDp1ToN; ++k, ++index)
{
mCache[k] = mData[index];
if (++loop[0] <= mGridMax[0])
{
continue;
}
loop[0] = mGridMin[0];
index += delta0;
loop[1]++;
}
// Compute and save the intermediate product.
for (int i = 0, j = 0; i < mDp1ToN; ++i)
{
Real sum = (Real)0;
for (k = 0; k < mDp1ToN; k += mSkip[j], j += mSkip[j])
{
sum += mProduct[j]*mCache[k];
}
mInter[i] = sum;
}
}
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// Explicit instantiation.
//----------------------------------------------------------------------------
template WM5_MATHEMATICS_ITEM
class IntpBSplineUniform2<float>;
template WM5_MATHEMATICS_ITEM
class IntpBSplineUniform2<double>;
//----------------------------------------------------------------------------
}
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