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-rw-r--r--libdimension/plane.c88
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diff --git a/libdimension/plane.c b/libdimension/plane.c
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-/*************************************************************************
- * Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>. *
- *************************************************************************/
-
-/**
- * @file
- * Planes.
- */
-
-#include "dimension.h"
-#include <math.h>
-#include <stdlib.h>
-
-/// Plane type.
-typedef struct {
- dmnsn_object object;
- dmnsn_vector normal;
-} dmnsn_plane;
-
-/// Returns the closest intersection of `line' with `plane'.
-static bool
-dmnsn_plane_intersection_fn(const dmnsn_object *object, dmnsn_line line,
- dmnsn_intersection *intersection)
-{
- const dmnsn_plane *plane = (const dmnsn_plane *)object;
- dmnsn_vector normal = plane->normal;
-
- double den = dmnsn_vector_dot(line.n, normal);
- if (den != 0.0) {
- double t = -dmnsn_vector_dot(line.x0, normal)/den;
- if (t >= 0.0) {
- intersection->t = t;
- intersection->normal = normal;
- return true;
- }
- }
- return false;
-}
-
-/// Return whether a point is inside a plane.
-static bool
-dmnsn_plane_inside_fn(const dmnsn_object *object, dmnsn_vector point)
-{
- const dmnsn_plane *plane = (const dmnsn_plane *)object;
- return dmnsn_vector_dot(point, plane->normal) < 0.0;
-}
-
-/// Plane bounding callback.
-static dmnsn_bounding_box
-dmnsn_plane_bounding_fn(const dmnsn_object *object, dmnsn_matrix trans)
-{
- return dmnsn_infinite_bounding_box();
-}
-
-/// Plane vtable.
-static const dmnsn_object_vtable dmnsn_plane_vtable = {
- .intersection_fn = dmnsn_plane_intersection_fn,
- .inside_fn = dmnsn_plane_inside_fn,
- .bounding_fn = dmnsn_plane_bounding_fn,
-};
-
-dmnsn_object *
-dmnsn_new_plane(dmnsn_pool *pool, dmnsn_vector normal)
-{
- dmnsn_plane *plane = DMNSN_PALLOC(pool, dmnsn_plane);
- plane->normal = normal;
-
- dmnsn_object *object = &plane->object;
- dmnsn_init_object(object);
- object->vtable = &dmnsn_plane_vtable;
- return object;
-}