v2math.cpp

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#include "linden_common.h"

//#include "vmath.h"
#include "v2math.h"
#include "v4math.h"
#include "m4math.h"
#include "m3math.h"
#include "llquaternion.h"

// LLVector2

LLVector2 LLVector2::zero(0,0);


// Non-member functions

// Sets all values to absolute value of their original values
// Returns TRUE if data changed
BOOL LLVector2::abs()
{
        BOOL ret = FALSE;

        if (mV[0] < 0.f) { mV[0] = -mV[0]; ret = TRUE; }
        if (mV[1] < 0.f) { mV[1] = -mV[1]; ret = TRUE; }
        
        return ret;
}


F32 angle_between(const LLVector2& a, const LLVector2& b)
{
        LLVector2 an = a;
        LLVector2 bn = b;
        an.normVec();
        bn.normVec();
        F32 cosine = an * bn;
        F32 angle = (cosine >= 1.0f) ? 0.0f :
                                (cosine <= -1.0f) ? F_PI :
                                acos(cosine);
        return angle;
}

BOOL are_parallel(const LLVector2 &a, const LLVector2 &b, float epsilon)
{
        LLVector2 an = a;
        LLVector2 bn = b;
        an.normVec();
        bn.normVec();
        F32 dot = an * bn;
        if ( (1.0f - fabs(dot)) < epsilon)
        {
                return TRUE;
        }
        return FALSE;
}


F32     dist_vec(const LLVector2 &a, const LLVector2 &b)
{
        F32 x = a.mV[0] - b.mV[0];
        F32 y = a.mV[1] - b.mV[1];
        return fsqrtf( x*x + y*y );
}

F32     dist_vec_squared(const LLVector2 &a, const LLVector2 &b)
{
        F32 x = a.mV[0] - b.mV[0];
        F32 y = a.mV[1] - b.mV[1];
        return x*x + y*y;
}

F32     dist_vec_squared2D(const LLVector2 &a, const LLVector2 &b)
{
        F32 x = a.mV[0] - b.mV[0];
        F32 y = a.mV[1] - b.mV[1];
        return x*x + y*y;
}

LLVector2 lerp(const LLVector2 &a, const LLVector2 &b, F32 u)
{
        return LLVector2(
                a.mV[VX] + (b.mV[VX] - a.mV[VX]) * u,
                a.mV[VY] + (b.mV[VY] - a.mV[VY]) * u );
}

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