IceSegment.cpp

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// Precompiled Header
#include "Stdafx.h"

using namespace IceMaths;

float Segment::SquareDistance(const Point& point, float* t)     const
{
        Point Diff = point - mP0;
        Point Dir = mP1 - mP0;
        float fT = Diff | Dir;

        if(fT<=0.0f)
        {
                fT = 0.0f;
        }
        else
        {
                float SqrLen= Dir.SquareMagnitude();
                if(fT>=SqrLen)
                {
                        fT = 1.0f;
                        Diff -= Dir;
                }
                else
                {
                        fT /= SqrLen;
                        Diff -= fT*Dir;
                }
        }

        if(t)   *t = fT;

        return Diff.SquareMagnitude();
}