mirror of https://github.com/axmolengine/axmol.git
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* Copyright (c) 2007 Scott Lembcke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdio.h>
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#include <math.h>
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#include "chipmunk.h"
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cpFloat
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cpvlength(const cpVect v)
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{
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return cpfsqrt( cpvdot(v, v) );
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}
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inline cpVect
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cpvslerp(const cpVect v1, const cpVect v2, const cpFloat t)
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{
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cpFloat omega = cpfacos(cpvdot(v1, v2));
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if(omega){
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cpFloat denom = 1.0f/cpfsin(omega);
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return cpvadd(cpvmult(v1, cpfsin((1.0f - t)*omega)*denom), cpvmult(v2, cpfsin(t*omega)*denom));
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} else {
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return v1;
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}
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}
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cpVect
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cpvslerpconst(const cpVect v1, const cpVect v2, const cpFloat a)
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{
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cpFloat angle = cpfacos(cpvdot(v1, v2));
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return cpvslerp(v1, v2, cpfmin(a, angle)/angle);
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}
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cpVect
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cpvforangle(const cpFloat a)
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{
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return cpv(cpfcos(a), cpfsin(a));
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}
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cpFloat
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cpvtoangle(const cpVect v)
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{
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return cpfatan2(v.y, v.x);
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}
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char*
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cpvstr(const cpVect v)
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{
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static char str[256];
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sprintf(str, "(% .3f, % .3f)", v.x, v.y);
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return str;
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}
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