93 lines
1.7 KiB
C++
93 lines
1.7 KiB
C++
/**
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* @file v2math.cpp
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* @brief LLVector2 class implementation.
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*
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* Copyright (c) 2000-$CurrentYear$, Linden Research, Inc.
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* $License$
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*/
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#include "linden_common.h"
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//#include "vmath.h"
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#include "v2math.h"
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#include "v4math.h"
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#include "m4math.h"
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#include "m3math.h"
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#include "llquaternion.h"
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// LLVector2
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LLVector2 LLVector2::zero(0,0);
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// Non-member functions
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// Sets all values to absolute value of their original values
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// Returns TRUE if data changed
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BOOL LLVector2::abs()
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{
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BOOL ret = FALSE;
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if (mV[0] < 0.f) { mV[0] = -mV[0]; ret = TRUE; }
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if (mV[1] < 0.f) { mV[1] = -mV[1]; ret = TRUE; }
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return ret;
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}
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F32 angle_between(const LLVector2& a, const LLVector2& b)
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{
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LLVector2 an = a;
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LLVector2 bn = b;
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an.normVec();
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bn.normVec();
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F32 cosine = an * bn;
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F32 angle = (cosine >= 1.0f) ? 0.0f :
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(cosine <= -1.0f) ? F_PI :
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acos(cosine);
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return angle;
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}
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BOOL are_parallel(const LLVector2 &a, const LLVector2 &b, float epsilon)
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{
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LLVector2 an = a;
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LLVector2 bn = b;
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an.normVec();
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bn.normVec();
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F32 dot = an * bn;
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if ( (1.0f - fabs(dot)) < epsilon)
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{
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return TRUE;
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}
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return FALSE;
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}
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F32 dist_vec(const LLVector2 &a, const LLVector2 &b)
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{
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F32 x = a.mV[0] - b.mV[0];
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F32 y = a.mV[1] - b.mV[1];
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return fsqrtf( x*x + y*y );
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}
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F32 dist_vec_squared(const LLVector2 &a, const LLVector2 &b)
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{
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F32 x = a.mV[0] - b.mV[0];
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F32 y = a.mV[1] - b.mV[1];
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return x*x + y*y;
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}
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F32 dist_vec_squared2D(const LLVector2 &a, const LLVector2 &b)
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{
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F32 x = a.mV[0] - b.mV[0];
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F32 y = a.mV[1] - b.mV[1];
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return x*x + y*y;
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}
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LLVector2 lerp(const LLVector2 &a, const LLVector2 &b, F32 u)
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{
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return LLVector2(
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a.mV[VX] + (b.mV[VX] - a.mV[VX]) * u,
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a.mV[VY] + (b.mV[VY] - a.mV[VY]) * u );
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}
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