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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of Dimension. *
* *
* Dimension 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. *
* *
* Dimension 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/>. *
*************************************************************************/
/*
* Core geometric types like scalars, vectors, and rays.
*/
#ifndef DIMENSION_GEOMETRY_H
#define DIMENSION_GEOMETRY_H
/* Scalar and vector types. */
typedef double dmnsn_scalar;
typedef struct { dmnsn_scalar x, y, z; } dmnsn_vector;
/* Vector arithmetic */
dmnsn_vector dmnsn_vector_construct(dmnsn_scalar x,
dmnsn_scalar y,
dmnsn_scalar z);
dmnsn_vector dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs);
dmnsn_vector dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs);
dmnsn_vector dmnsn_vector_mul(dmnsn_scalar lhs, dmnsn_vector rhs);
dmnsn_vector dmnsn_vector_div(dmnsn_vector lhs, dmnsn_scalar rhs);
dmnsn_scalar dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs);
dmnsn_vector dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs);
/* A line, or ray. */
typedef struct {
dmnsn_vector x0; /* A point on the line */
dmnsn_vector n; /* A normal vector; the direction of the line */
} dmnsn_line;
/* A point on a line, defined by x0 + t*n */
dmnsn_vector dmnsn_line_point(dmnsn_line l, dmnsn_scalar t);
#endif /* DIMENSION_GEOMETRY_H */
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