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DavidWyand-GG 2012-09-19 11:15:01 -04:00
parent 352279af7a
commit 7dbfe6994d
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Engine/lib/opcode/Ice/IceSegment.cpp Normal file
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Contains code for segments.
* \file IceSegment.cpp
* \author Pierre Terdiman
* \date April, 4, 2000
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Segment class.
* A segment is defined by S(t) = mP0 * (1 - t) + mP1 * t, with 0 <= t <= 1
* Alternatively, a segment is S(t) = Origin + t * Direction for 0 <= t <= 1.
* Direction is not necessarily unit length. The end points are Origin = mP0 and Origin + Direction = mP1.
*
* \class Segment
* \author Pierre Terdiman
* \version 1.0
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include "../Opcode.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();
}