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FLTK - Fast Light Tool Kit - https://github.com/fltk/fltk - cross platform GUI development
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78 lines
3.2 KiB
78 lines
3.2 KiB
/* |
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* (c) Copyright 1993, 1994, Silicon Graphics, Inc. |
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* ALL RIGHTS RESERVED |
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* Permission to use, copy, modify, and distribute this software for |
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* any purpose and without fee is hereby granted, provided that the above |
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* copyright notice appear in all copies and that both the copyright notice |
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* and this permission notice appear in supporting documentation, and that |
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* the name of Silicon Graphics, Inc. not be used in advertising |
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* or publicity pertaining to distribution of the software without specific, |
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* written prior permission. |
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* |
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" |
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, |
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR |
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON |
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, |
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY |
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, |
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF |
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN |
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON |
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE |
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. |
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* |
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* US Government Users Restricted Rights |
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* Use, duplication, or disclosure by the Government is subject to |
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph |
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software |
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* clause at DFARS 252.227-7013 and/or in similar or successor |
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* clauses in the FAR or the DOD or NASA FAR Supplement. |
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* Unpublished-- rights reserved under the copyright laws of the |
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* United States. Contractor/manufacturer is Silicon Graphics, |
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. |
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* |
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc. |
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*/ |
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/* |
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* trackball.h |
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* A virtual trackball implementation |
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* Written by Gavin Bell for Silicon Graphics, November 1988. |
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*/ |
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/* |
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* Pass the x and y coordinates of the last and current positions of |
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* the mouse, scaled so they are from (-1.0 ... 1.0). |
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* |
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* The resulting rotation is returned as a quaternion rotation in the |
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* first paramater. |
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*/ |
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void |
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trackball(float q[4], float p1x, float p1y, float p2x, float p2y); |
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/* |
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* Given two quaternions, add them together to get a third quaternion. |
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* Adding quaternions to get a compound rotation is analagous to adding |
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* translations to get a compound translation. When incrementally |
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* adding rotations, the first argument here should be the new |
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* rotation, the second and third the total rotation (which will be |
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* over-written with the resulting new total rotation). |
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*/ |
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void |
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add_quats(float *q1, float *q2, float *dest); |
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/* |
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* A useful function, builds a rotation matrix in Matrix based on |
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* given quaternion. |
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*/ |
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void |
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build_rotmatrix(float m[4][4], float q[4]); |
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/* |
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* This function computes a quaternion based on an axis (defined by |
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* the given vector) and an angle about which to rotate. The angle is |
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* expressed in radians. The result is put into the third argument. |
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*/ |
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void |
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axis_to_quat(float a[3], float phi, float q[4]); |
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