From 9f8055ac23b829babe5ed469251435b64ac82831 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Sun, 14 Jun 2009 01:48:24 +0000 Subject: New cube object. --- libdimension/Makefile.am | 4 +- libdimension/cube.c | 113 ++++++++++++++++++++++++++++++++++++++++++ libdimension/dimension.h | 1 + libdimension/dimension/cube.h | 31 ++++++++++++ 4 files changed, 147 insertions(+), 2 deletions(-) create mode 100644 libdimension/cube.c create mode 100644 libdimension/dimension/cube.h (limited to 'libdimension') diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am index 29bc268..91d0af0 100644 --- a/libdimension/Makefile.am +++ b/libdimension/Makefile.am @@ -17,10 +17,10 @@ ## along with this program. If not, see . ## ########################################################################### -nobase_include_HEADERS = dimension.h dimension/array.h dimension/camera.h dimension/canvas.h dimension/color.h dimension/error.h dimension/geometry.h dimension/png.h dimension/object.h dimension/scene.h dimension/sphere.h +nobase_include_HEADERS = dimension.h dimension/array.h dimension/camera.h dimension/canvas.h dimension/color.h dimension/cube.h dimension/error.h dimension/geometry.h dimension/png.h dimension/object.h dimension/scene.h dimension/sphere.h lib_LTLIBRARIES = libdimension.la -libdimension_la_SOURCES = $(nobase_include_HEADERS) array.c camera.c canvas.c color.c error.c geometry.c png.c object.c scene.c sphere.c +libdimension_la_SOURCES = $(nobase_include_HEADERS) array.c camera.c canvas.c color.c cube.c error.c geometry.c png.c object.c scene.c sphere.c libdimension_la_LDFLAGS = -version-info 0:0:0 libdimension_la_LIBADD = -lm -lpthread -lpng diff --git a/libdimension/cube.c b/libdimension/cube.c new file mode 100644 index 0000000..197a0f8 --- /dev/null +++ b/libdimension/cube.c @@ -0,0 +1,113 @@ +/************************************************************************* + * 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 */ + +static dmnsn_array *dmnsn_cube_intersections_fn(const dmnsn_object *cube, + dmnsn_line line); +static int dmnsn_cube_inside_fn(const dmnsn_object *cube, + dmnsn_vector point); + +dmnsn_object * +dmnsn_new_cube() +{ + dmnsn_object *cube = dmnsn_new_object(); + if (cube) { + cube->intersections_fn = &dmnsn_cube_intersections_fn; + cube->inside_fn = &dmnsn_cube_inside_fn; + } + return cube; +} + +void +dmnsn_delete_cube(dmnsn_object *cube) +{ + dmnsn_delete_object(cube); +} + +static dmnsn_array * +dmnsn_cube_intersections_fn(const dmnsn_object *cube, dmnsn_line line) +{ + double t; + dmnsn_vector p; + dmnsn_array *array = dmnsn_new_array(sizeof(double)); + + /* Six ray-plane intersection tests (x, y, z) = +/- 1.0 */ + + if (line.n.x != 0.0) { + /* x = -1.0 */ + t = (-1.0 - line.x0.x)/line.n.x; + p = dmnsn_line_point(line, t); + if (p.y >= -1.0 && p.y <= 1.0 && p.z >= -1.0 && p.z <= 1.0) { + dmnsn_array_push(array, &t); + } + + /* x = 1.0 */ + t = (1.0 - line.x0.x)/line.n.x; + p = dmnsn_line_point(line, t); + if (p.y >= -1.0 && p.y <= 1.0 && p.z >= -1.0 && p.z <= 1.0) { + dmnsn_array_push(array, &t); + } + } + + if (line.n.y != 0.0) { + /* y = -1.0 */ + t = (-1.0 - line.x0.y)/line.n.y; + p = dmnsn_line_point(line, t); + if (p.x >= -1.0 && p.x <= 1.0 && p.z >= -1.0 && p.z <= 1.0) { + dmnsn_array_push(array, &t); + } + + /* y = 1.0 */ + t = (1.0 - line.x0.y)/line.n.y; + p = dmnsn_line_point(line, t); + if (p.x >= -1.0 && p.x <= 1.0 && p.z >= -1.0 && p.z <= 1.0) { + dmnsn_array_push(array, &t); + } + } + + if (line.n.z != 0.0) { + /* z = -1.0 */ + t = (-1.0 - line.x0.z)/line.n.z; + p = dmnsn_line_point(line, t); + if (p.x >= -1.0 && p.x <= 1.0 && p.y >= -1.0 && p.y <= 1.0) { + dmnsn_array_push(array, &t); + } + + /* z = 1.0 */ + t = (1.0 - line.x0.z)/line.n.z; + p = dmnsn_line_point(line, t); + if (p.x >= -1.0 && p.x <= 1.0 && p.y >= -1.0 && p.y <= 1.0) { + dmnsn_array_push(array, &t); + } + } + + return array; +} + +static int +dmnsn_cube_inside_fn(const dmnsn_object *cube, dmnsn_vector point) +{ + return point.x > -1.0 && point.x < 1.0 + && point.y > -1.0 && point.y < 1.0 + && point.z > -1.0 && point.z < 1.0; +} diff --git a/libdimension/dimension.h b/libdimension/dimension.h index 3eb0bae..ba47487 100644 --- a/libdimension/dimension.h +++ b/libdimension/dimension.h @@ -33,6 +33,7 @@ extern "C" { #include #include #include +#include #include #include #include diff --git a/libdimension/dimension/cube.h b/libdimension/dimension/cube.h new file mode 100644 index 0000000..e7f2b90 --- /dev/null +++ b/libdimension/dimension/cube.h @@ -0,0 +1,31 @@ +/************************************************************************* + * 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 * + * . * + *************************************************************************/ + +#ifndef DIMENSION_CUBE_H +#define DIMENSION_CUBE_H + +/* + * A cube, axis-aligned, from (-1, -1, -1) to (1, 1, 1) + */ + +dmnsn_object *dmnsn_new_cube(); +void dmnsn_delete_cube(dmnsn_object *cube); + +#endif /* DIMENSION_CUBE_H */ -- cgit v1.2.3