160 lines
5.2 KiB
C
160 lines
5.2 KiB
C
/**************************************************************************
|
|
* views.c -- data structures and routines for managing and view parameters.
|
|
*
|
|
* Written by Curtis Olson, started August 1997.
|
|
*
|
|
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program 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
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id$
|
|
* (Log is kept at end of this file)
|
|
**************************************************************************/
|
|
|
|
|
|
#include "views.h"
|
|
|
|
#include "../Include/constants.h"
|
|
|
|
#include "../Flight/flight.h"
|
|
#include "../Math/mat3.h"
|
|
#include "../Math/polar.h"
|
|
#include "../Scenery/scenery.h"
|
|
|
|
|
|
/* This is a record containing current view parameters */
|
|
struct fgVIEW current_view;
|
|
|
|
|
|
/* Initialize a view structure */
|
|
void fgViewInit(struct fgVIEW *v) {
|
|
v->view_offset = 0.0;
|
|
v->goal_view_offset = 0.0;
|
|
}
|
|
|
|
|
|
/* Update the view parameters */
|
|
void fgViewUpdate(struct fgFLIGHT *f, struct fgVIEW *v) {
|
|
MAT3vec vec, forward;
|
|
MAT3mat R, TMP, UP, LOCAL, VIEW;
|
|
|
|
/* calculate the cartesion coords of the current lat/lon/0 elev */
|
|
v->cur_zero_elev = fgPolarToCart(FG_Longitude, FG_Lat_geocentric,
|
|
FG_Sea_level_radius * FEET_TO_METER);
|
|
v->cur_zero_elev.x -= scenery.center.x;
|
|
v->cur_zero_elev.y -= scenery.center.y;
|
|
v->cur_zero_elev.z -= scenery.center.z;
|
|
|
|
/* calculate view position in current FG view coordinate system */
|
|
v->view_pos = fgPolarToCart(FG_Longitude, FG_Lat_geocentric,
|
|
FG_Radius_to_vehicle * FEET_TO_METER + 1.0);
|
|
v->view_pos.x -= scenery.center.x;
|
|
v->view_pos.y -= scenery.center.y;
|
|
v->view_pos.z -= scenery.center.z;
|
|
|
|
printf("View pos = %.4f, %.4f, %.4f\n",
|
|
v->view_pos.x, v->view_pos.y, v->view_pos.z);
|
|
|
|
/* Derive the LOCAL aircraft rotation matrix (roll, pitch, yaw) */
|
|
MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
|
|
MAT3rotate(R, vec, FG_Phi);
|
|
/* printf("Roll matrix\n"); */
|
|
/* MAT3print(R, stdout); */
|
|
|
|
MAT3_SET_VEC(vec, 0.0, 1.0, 0.0);
|
|
/* MAT3mult_vec(vec, vec, R); */
|
|
MAT3rotate(TMP, vec, FG_Theta);
|
|
/* printf("Pitch matrix\n"); */
|
|
/* MAT3print(TMP, stdout); */
|
|
MAT3mult(R, R, TMP);
|
|
|
|
MAT3_SET_VEC(vec, 1.0, 0.0, 0.0);
|
|
/* MAT3mult_vec(vec, vec, R); */
|
|
/* MAT3rotate(TMP, vec, FG_Psi - FG_PI_2); */
|
|
MAT3rotate(TMP, vec, -FG_Psi);
|
|
/* printf("Yaw matrix\n");
|
|
MAT3print(TMP, stdout); */
|
|
MAT3mult(LOCAL, R, TMP);
|
|
/* printf("LOCAL matrix\n"); */
|
|
/* MAT3print(LOCAL, stdout); */
|
|
|
|
/* Derive the local UP transformation matrix based on *geodetic*
|
|
* coordinates */
|
|
MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
|
|
MAT3rotate(R, vec, FG_Longitude); /* R = rotate about Z axis */
|
|
/* printf("Longitude matrix\n"); */
|
|
/* MAT3print(R, stdout); */
|
|
|
|
MAT3_SET_VEC(vec, 0.0, 1.0, 0.0);
|
|
MAT3mult_vec(vec, vec, R);
|
|
MAT3rotate(TMP, vec, -FG_Latitude); /* TMP = rotate about X axis */
|
|
/* printf("Latitude matrix\n"); */
|
|
/* MAT3print(TMP, stdout); */
|
|
|
|
MAT3mult(UP, R, TMP);
|
|
/* printf("Local up matrix\n"); */
|
|
/* MAT3print(UP, stdout); */
|
|
|
|
MAT3_SET_VEC(v->local_up, 1.0, 0.0, 0.0);
|
|
MAT3mult_vec(v->local_up, v->local_up, UP);
|
|
|
|
printf(" Local Up = (%.4f, %.4f, %.4f)\n",
|
|
v->local_up[0], v->local_up[1], v->local_up[2]);
|
|
|
|
/* Alternative method to Derive local up vector based on
|
|
* *geodetic* coordinates */
|
|
/* alt_up = fgPolarToCart(FG_Longitude, FG_Latitude, 1.0); */
|
|
/* printf(" Alt Up = (%.4f, %.4f, %.4f)\n",
|
|
alt_up.x, alt_up.y, alt_up.z); */
|
|
|
|
/* Derive the VIEW matrix */
|
|
MAT3mult(VIEW, LOCAL, UP);
|
|
/* printf("VIEW matrix\n"); */
|
|
/* MAT3print(VIEW, stdout); */
|
|
|
|
/* generate the current up, forward, and fwrd-view vectors */
|
|
MAT3_SET_VEC(vec, 1.0, 0.0, 0.0);
|
|
MAT3mult_vec(v->view_up, vec, VIEW);
|
|
|
|
MAT3_SET_VEC(vec, 0.0, 0.0, 1.0);
|
|
MAT3mult_vec(forward, vec, VIEW);
|
|
printf("Forward vector is (%.2f,%.2f,%.2f)\n", forward[0], forward[1],
|
|
forward[2]);
|
|
|
|
MAT3rotate(TMP, v->view_up, v->view_offset);
|
|
MAT3mult_vec(v->view_forward, forward, TMP);
|
|
|
|
}
|
|
|
|
|
|
/* $Log$
|
|
/* Revision 1.5 1997/12/18 04:07:02 curt
|
|
/* Worked on properly translating and positioning the sky dome.
|
|
/*
|
|
* Revision 1.4 1997/12/17 23:13:36 curt
|
|
* Began working on rendering a sky.
|
|
*
|
|
* Revision 1.3 1997/12/15 23:54:50 curt
|
|
* Add xgl wrappers for debugging.
|
|
* Generate terrain normals on the fly.
|
|
*
|
|
* Revision 1.2 1997/12/10 22:37:48 curt
|
|
* Prepended "fg" on the name of all global structures that didn't have it yet.
|
|
* i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
|
|
*
|
|
* Revision 1.1 1997/08/27 21:31:17 curt
|
|
* Initial revision.
|
|
*
|
|
*/
|