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8876b879d3
2008-03-24 Michael Natterer <mitch@gimp.org> Renamed folders in plug-ins/. Unfortunately it's impossible to rename the files inside at the same time, so this is just part one... * plug-ins/FractalExplorer -> fractal-explorer * plug-ins/Lighting -> lighting * plug-ins/MapObject -> map-object * plug-ins/gflare -> gradient-flare * plug-ins/gfli -> fli * plug-ins/helpbrowser -> help-browser * plug-ins/ifscompose -> ifs-compose * plug-ins/rcm -> colormap-rotate * plug-ins/sel2path -> selection-to-path * plug-ins/winicon -> win-icon * plug-ins/winsnap -> win-snap * configure.in * plug-ins/Makefile.am: changed accordingly. svn path=/trunk/; revision=25194
251 lines
4.1 KiB
C
251 lines
4.1 KiB
C
/* vector.c: vector/point operations.
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*
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* Copyright (C) 1992 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <math.h>
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#include <assert.h>
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#include "global.h"
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#include "config.h"
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#include "vector.h"
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/* Given the point COORD, return the corresponding vector. */
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vector_type
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make_vector (const real_coordinate_type c)
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{
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vector_type v;
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v.dx = c.x;
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v.dy = c.y;
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return v;
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}
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/* And the converse: given a vector, return the corresponding point. */
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real_coordinate_type
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vector_to_point (const vector_type v)
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{
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real_coordinate_type coord;
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coord.x = v.dx;
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coord.y = v.dy;
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return coord;
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}
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real
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magnitude (const vector_type v)
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{
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return hypot (v.dx, v.dy);
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}
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vector_type
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normalize (const vector_type v)
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{
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vector_type new_v;
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real m = magnitude (v);
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assert (m > 0.0);
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new_v.dx = v.dx / m;
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new_v.dy = v.dy / m;
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return new_v;
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}
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vector_type
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Vadd (const vector_type v1, const vector_type v2)
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{
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vector_type new_v;
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new_v.dx = v1.dx + v2.dx;
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new_v.dy = v1.dy + v2.dy;
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return new_v;
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}
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real
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Vdot (const vector_type v1, const vector_type v2)
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{
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return v1.dx * v2.dx + v1.dy * v2.dy;
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}
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vector_type
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Vmult_scalar (const vector_type v, const real r)
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{
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vector_type new_v;
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new_v.dx = v.dx * r;
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new_v.dy = v.dy * r;
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return new_v;
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}
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/* Given the IN_VECTOR and OUT_VECTOR, return the angle between them in
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degrees, in the range zero to 180. */
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real
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Vangle (const vector_type in_vector, const vector_type out_vector)
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{
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vector_type v1 = normalize (in_vector);
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vector_type v2 = normalize (out_vector);
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return my_acosd (Vdot (v2, v1));
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}
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real_coordinate_type
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Vadd_point (const real_coordinate_type c, const vector_type v)
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{
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real_coordinate_type new_c;
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new_c.x = c.x + v.dx;
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new_c.y = c.y + v.dy;
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return new_c;
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}
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real_coordinate_type
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Vsubtract_point (const real_coordinate_type c, const vector_type v)
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{
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real_coordinate_type new_c;
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new_c.x = c.x - v.dx;
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new_c.y = c.y - v.dy;
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return new_c;
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}
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coordinate_type
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Vadd_int_point (const coordinate_type c, const vector_type v)
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{
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coordinate_type a;
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a.x = SROUND ((real) c.x + v.dx);
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a.y = SROUND ((real) c.y + v.dy);
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return a;
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}
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vector_type
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Vabs (const vector_type v)
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{
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vector_type new_v;
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new_v.dx = fabs (v.dx);
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new_v.dy = fabs (v.dy);
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return new_v;
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}
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/* Operations on points. */
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vector_type
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Psubtract (const real_coordinate_type c1, const real_coordinate_type c2)
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{
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vector_type v;
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v.dx = c1.x - c2.x;
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v.dy = c1.y - c2.y;
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return v;
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}
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/* Operations on integer points. */
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vector_type
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IPsubtract (const coordinate_type coord1, const coordinate_type coord2)
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{
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vector_type v;
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v.dx = coord1.x - coord2.x;
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v.dy = coord1.y - coord2.y;
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return v;
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}
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coordinate_type
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IPsubtractP (const coordinate_type c1, const coordinate_type c2)
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{
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coordinate_type c;
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c.x = c1.x - c2.x;
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c.y = c1.y - c2.y;
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return c;
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}
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coordinate_type
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IPadd (const coordinate_type c1, const coordinate_type c2)
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{
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coordinate_type c;
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c.x = c1.x + c2.x;
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c.y = c1.y + c2.y;
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return c;
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}
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coordinate_type
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IPmult_scalar (const coordinate_type c, const int i)
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{
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coordinate_type a;
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a.x = c.x * i;
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a.y = c.y * i;
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return a;
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}
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real_coordinate_type
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IPmult_real (const coordinate_type c, const real r)
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{
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real_coordinate_type a;
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a.x = c.x * r;
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a.y = c.y * r;
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return a;
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}
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boolean
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IPequal (const coordinate_type c1, const coordinate_type c2)
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{
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return c1.x == c2.x && c1.y == c2.y;
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}
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