IceSegment.cpp

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// Precompiled Header
#include "Stdafx.h"


using namespace Opcode;

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();
}