// @Override
public void add(int i, double[] P1, double[] P2, double[] Q)
{
// assert P1 == p1;
// assert P2 == p2;
for (int f = 0; f < distfunc.getComplexity(); f++)
{
FacetList fl = sortedfacets[f];
FacetListElement fle = new FacetListElement();
fle.index = i;
fle.slope = fl.slope;
fle.height = distfunc.getFacetDistance(VectorUtil.subtract(p1, Q), fl.facet);
while (fl.getSize() > 0 && fl.getFirst().height <= fle.height)
{
fl.removeFirst();
}
fl.addFirst(fle);
}
}
private double findMinimumTrimmedProcedure()
{
FacetListElement[] upperenvelope = new FacetListElement[distfunc.getComplexity()];
FacetListElement first = sortedfacets[0].getLast();
upperenvelope[0] = first;
double[] intersectPreviousAt = new double[distfunc.getComplexity()];
intersectPreviousAt[0] = 0;
int n = 1;
for (int i = 1; i < distfunc.getComplexity(); i++)
{
FacetList fl = sortedfacets[i];
FacetListElement fle = fl.getLast();
upperenvelope[n] = fle;
intersectPreviousAt[n] = findIntersection(upperenvelope[n - 1], fle);
n++;
if (double.IsInfinity(intersectPreviousAt[n - 1]) || double.IsNaN(intersectPreviousAt[n - 1]))
{
// NB: can only occur with the first previous one (slopes are unique in UE)
if (upperenvelope[n - 1].height > upperenvelope[n - 2].height)
{
// toss previous
upperenvelope[n - 2] = upperenvelope[n - 1];
if (n > 2)
{
intersectPreviousAt[n - 2] = findIntersection(upperenvelope[n - 3], fle);
}
else
{
// nothing to intersect
}
n--;
}
else
{
// toss this one
n--;
}
}
while (n > 1 && intersectPreviousAt[n - 1] < intersectPreviousAt[n - 2])
{
// [n-2] not on upper envelope
upperenvelope[n - 2] = upperenvelope[n - 1];
if (n == 2)
{
// intersectPreviousAt[n-2] = 0; // doesn't change
}
else
{
intersectPreviousAt[n - 2] = findIntersection(upperenvelope[n - 3], fle);
}
n--;
}
if (intersectPreviousAt[n - 1] > 1)
{
// assert n > 1;
n--;
}
else if (n > 1 && upperenvelope[n - 2].slope > 0)
{
n--;
}
}
double min;
if (upperenvelope[n - 1].slope > 0)
{
if (n > 1)
{
// get height at intersection with previous
min = upperenvelope[n - 1].slope * intersectPreviousAt[n - 1] + upperenvelope[n - 1].height;
}
else
{
// get height at 0
min = upperenvelope[n - 1].height;
}
}
else
{
// get height at 1
min = upperenvelope[n - 1].slope + upperenvelope[n - 1].height;
}
return(min);
}
private double findIntersection(FacetListElement fle1, FacetListElement fle2)
{
double xint = (fle2.height - fle1.height) / (fle1.slope - fle2.slope);
return(xint);
}
private double findMinimumFullProcedure()
{
FacetListElement[] upperenvelope = new FacetListElement[distfunc.getComplexity()];
FacetListElement first = sortedfacets[0].getLast();
upperenvelope[0] = first;
double[] intersectPreviousAt = new double[distfunc.getComplexity()];
intersectPreviousAt[0] = double.NegativeInfinity;
int n = 1;
for (int i = 1; i < distfunc.getComplexity(); i++)
{
FacetList fl = sortedfacets[i];
FacetListElement fle = fl.getLast();
upperenvelope[n] = fle;
intersectPreviousAt[n] = findIntersection(upperenvelope[n - 1], fle);
n++;
if (double.IsInfinity(intersectPreviousAt[n - 1]) || double.IsNaN(intersectPreviousAt[n - 1]))
{
// NB: can only occur with the first previous one (slopes are unique in UE)
if (upperenvelope[n - 1].height > upperenvelope[n - 2].height)
{
upperenvelope[n - 2] = upperenvelope[n - 1];
if (n > 2)
{
intersectPreviousAt[n - 2] = findIntersection(upperenvelope[n - 3], fle);
}
else
{
}
n--;
}
else
{
n--;
}
}
while (n > 1 && intersectPreviousAt[n - 1] < intersectPreviousAt[n - 2])
{
upperenvelope[n - 2] = upperenvelope[n - 1];
intersectPreviousAt[n - 2] = findIntersection(upperenvelope[n - 3], fle);
n--;
}
}
// minimum given by first point with positve slop
int min_index = -1;
for (int i = 0; i < n; i++)
{
if (upperenvelope[i].slope > 0)
{
min_index = i;
break;
}
}
double min;
if (intersectPreviousAt[min_index] < 0)
{
while (min_index < n - 1 && intersectPreviousAt[min_index + 1] < 0)
{
min_index++;
}
min = upperenvelope[min_index].height;
}
else if (intersectPreviousAt[min_index] > 1)
{
while (min_index > 0 && intersectPreviousAt[min_index] > 1)
{
min_index--;
}
min = upperenvelope[min_index].slope + upperenvelope[min_index].height;
}
else
{
min = upperenvelope[min_index].slope * intersectPreviousAt[min_index] + upperenvelope[min_index].height;
}
return(min);
}
