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/* Copyright (c) 2007 Scott Lembcke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
typedef struct cpVect{
cpFloat x,y;
} cpVect;
static const cpVect cpvzero={0.0f,0.0f};
static inline cpVect
cpv(const cpFloat x, const cpFloat y)
{
cpVect v = {x, y};
return v;
}
static inline cpVect
cpvadd(const cpVect v1, const cpVect v2)
{
return cpv(v1.x + v2.x, v1.y + v2.y);
}
static inline cpVect
cpvneg(const cpVect v)
{
return cpv(-v.x, -v.y);
}
static inline cpVect
cpvsub(const cpVect v1, const cpVect v2)
{
return cpv(v1.x - v2.x, v1.y - v2.y);
}
static inline cpVect
cpvmult(const cpVect v, const cpFloat s)
{
return cpv(v.x*s, v.y*s);
}
static inline cpFloat
cpvdot(const cpVect v1, const cpVect v2)
{
return v1.x*v2.x + v1.y*v2.y;
}
static inline cpFloat
cpvcross(const cpVect v1, const cpVect v2)
{
return v1.x*v2.y - v1.y*v2.x;
}
static inline cpVect
cpvperp(const cpVect v)
{
return cpv(-v.y, v.x);
}
static inline cpVect
cpvrperp(const cpVect v)
{
return cpv(v.y, -v.x);
}
static inline cpVect
cpvproject(const cpVect v1, const cpVect v2)
{
return cpvmult(v2, cpvdot(v1, v2)/cpvdot(v2, v2));
}
static inline cpVect
cpvrotate(const cpVect v1, const cpVect v2)
{
return cpv(v1.x*v2.x - v1.y*v2.y, v1.x*v2.y + v1.y*v2.x);
}
static inline cpVect
cpvunrotate(const cpVect v1, const cpVect v2)
{
return cpv(v1.x*v2.x + v1.y*v2.y, v1.y*v2.x - v1.x*v2.y);
}
cpFloat cpvlength(const cpVect v);
cpFloat cpvlengthsq(const cpVect v); // no sqrt() call
cpVect cpvnormalize(const cpVect v);
cpVect cpvforangle(const cpFloat a); // convert radians to a normalized vector
cpFloat cpvtoangle(const cpVect v); // convert a vector to radians
char *cpvstr(const cpVect v); // get a string representation of a vector
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