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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension.h"
/* Construct a vector from x, y, and z. Just for convienence. */
dmnsn_vector
dmnsn_vector_construct(dmnsn_scalar x, dmnsn_scalar y, dmnsn_scalar z)
{
dmnsn_vector v = { .x = x, .y = y, .z = z };
return v;
}
/* Add two vectors */
dmnsn_vector
dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs)
{
dmnsn_vector v = { .x = lhs.x + rhs.x,
.y = lhs.y + rhs.y,
.z = lhs.z + rhs.z };
return v;
}
/* Subtract two vectors */
dmnsn_vector
dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs)
{
dmnsn_vector v = { .x = lhs.x - rhs.x,
.y = lhs.y - rhs.y,
.z = lhs.z - rhs.z };
return v;
}
/* Multiply a vector by a scalar */
dmnsn_vector
dmnsn_vector_mul(dmnsn_scalar lhs, dmnsn_vector rhs)
{
dmnsn_vector v = { .x = lhs*rhs.x, .y = lhs*rhs.y, .z = lhs*rhs.z };
return v;
}
/* Divide a vector by a scalar */
dmnsn_vector
dmnsn_vector_div(dmnsn_vector lhs, dmnsn_scalar rhs)
{
dmnsn_vector v = { .x = lhs.x/rhs, .y = lhs.y/rhs, .z = lhs.z/rhs };
return v;
}
/* Dot product */
dmnsn_scalar
dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs)
{
return lhs.x*rhs.x + lhs.y*rhs.y + lhs.z*rhs.z;
}
/* Cross product */
dmnsn_vector
dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs)
{
dmnsn_vector v = { .x = lhs.y*rhs.z - lhs.z*rhs.y,
.y = lhs.z*rhs.x - lhs.x*rhs.z,
.z = lhs.x*rhs.y - lhs.y*rhs.x };
return v;
}
/* A point on a line, l. Returns l.x0 + t*l.n */
dmnsn_vector
dmnsn_line_point(dmnsn_line l, dmnsn_scalar t)
{
return dmnsn_vector_add(l.x0, dmnsn_vector_mul(t, l.n));
}
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