From e957408cb8cd200696a081b4f5c749c5294110ec Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Wed, 1 Jul 2009 04:44:51 +0000 Subject: Sphere and cube C++ wrappers. --- libdimension/sphere.c | 78 --------------------------------------------------- 1 file changed, 78 deletions(-) delete mode 100644 libdimension/sphere.c (limited to 'libdimension/sphere.c') diff --git a/libdimension/sphere.c b/libdimension/sphere.c deleted file mode 100644 index f6950dc..0000000 --- a/libdimension/sphere.c +++ /dev/null @@ -1,78 +0,0 @@ -/************************************************************************* - * Copyright (C) 2008 Tavian Barnes * - * * - * 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 * - * . * - *************************************************************************/ - -#include "dimension.h" -#include /* For malloc */ -#include /* For sqrt */ - -/* Sphere object callbacks */ -static dmnsn_array *dmnsn_sphere_intersections_fn(const dmnsn_object *sphere, - dmnsn_line line); -static int dmnsn_sphere_inside_fn(const dmnsn_object *sphere, - dmnsn_vector point); - -/* Allocate a new sphere */ -dmnsn_object * -dmnsn_new_sphere() -{ - dmnsn_object *sphere = dmnsn_new_object(); - if (sphere) { - sphere->intersections_fn = &dmnsn_sphere_intersections_fn; - sphere->inside_fn = &dmnsn_sphere_inside_fn; - } - return sphere; -} - -/* Free a sphere */ -void -dmnsn_delete_sphere(dmnsn_object *sphere) -{ - dmnsn_delete_object(sphere); -} - -/* Return a list of insersections of `line' with a sphere */ -static dmnsn_array * -dmnsn_sphere_intersections_fn(const dmnsn_object *sphere, dmnsn_line line) -{ - double a, b, c, t[2]; - dmnsn_array *array = dmnsn_new_array(sizeof(double)); - - /* Solve (x0 + nx*t)^2 + (y0 + ny*t)^2 + (z0 + nz*t)^2 == 1 */ - - a = line.n.x*line.n.x + line.n.y*line.n.y + line.n.z*line.n.z; - b = 2.0*(line.n.x*line.x0.x + line.n.y*line.x0.y + line.n.z*line.x0.z); - c = line.x0.x*line.x0.x + line.x0.y*line.x0.y + line.x0.z*line.x0.z - 1.0; - - if (b*b - 4.0*a*c >= 0) { - t[0] = (-b + sqrt(b*b - 4.0*a*c))/(2*a); - t[1] = (-b - sqrt(b*b - 4.0*a*c))/(2*a); - dmnsn_array_set(array, 0, &t[0]); - dmnsn_array_set(array, 1, &t[1]); - } - - return array; -} - -/* Return whether a point is inside a sphere (x**2 + y**2 + z**2 < 1.0) */ -static int -dmnsn_sphere_inside_fn(const dmnsn_object *sphere, dmnsn_vector point) -{ - return point.x*point.x + point.y*point.y + point.z*point.z < 1.0; -} -- cgit v1.2.3