61 lines
1.5 KiB
Plaintext
61 lines
1.5 KiB
Plaintext
/*
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* Copyright (c) 2016-2020 Marco Hladik <marco@icculus.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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float
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Math_LerpAngle(float fStart, float fEnd, float fAmount)
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{
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float shortest_angle = ((((fEnd - fStart) % 360) + 540) % 360) - 180;
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return shortest_angle * fAmount;
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}
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float
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Math_Lerp(float fA, float fB, float fPercent)
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{
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return (fA * (1 - fPercent)) + (fB * fPercent);
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}
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float
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Math_FixDelta(float fDelta)
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{
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if (fDelta >= 180) {
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fDelta -= 360;
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} else if (fDelta <= -180) {
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fDelta += 360;
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}
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return fDelta;
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}
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vector
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Math_Reflect(vector v1, vector v2)
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{
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return v1 - 2 * dotproduct(v1, v2) * v2;
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}
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vector
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Math_RandomVector(float fFlyUp)
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{
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vector tmp;
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tmp[0] = random() - 0.5f;
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tmp[1] = random() - 0.5f;
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if ( fFlyUp == TRUE ) {
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tmp[2] = random();
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} else {
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tmp[2] = random() - 0.5f;
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}
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return tmp * 2.0f;
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} |