1 // viewer.cxx -- class for managing a viewer in the flightgear world.
3 // Written by Curtis Olson, started August 1997.
4 // overhaul started October 2000.
6 // Copyright (C) 1997 - 2000 Curtis L. Olson - curt@flightgear.org
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <simgear/compiler.h>
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/constants.h>
38 FGViewer::FGViewer( void ):
39 scalingType(FG_SCALING_MAX),
42 goal_view_offset(0.0),
46 sgSetVec3( pilot_offset, 0.0, 0.0, 0.0 );
47 sgdZeroVec3(geod_view_pos);
48 sgdZeroVec3(abs_view_pos);
49 sea_level_radius = SG_EQUATORIAL_RADIUS_M;
50 //a reasonable guess for init, so that the math doesn't blow up
55 FGViewer::~FGViewer( void ) {
76 switch (scalingType) {
77 case FG_SCALING_WIDTH: // h_fov == fov
80 if (aspect_ratio < 1.0) {
85 return atan(tan(fov/2 * SG_DEGREES_TO_RADIANS) / aspect_ratio) *
86 SG_RADIANS_TO_DEGREES * 2;
96 switch (scalingType) {
97 case FG_SCALING_WIDTH: // h_fov == fov
98 return atan(tan(fov/2 * SG_DEGREES_TO_RADIANS) * aspect_ratio) *
99 SG_RADIANS_TO_DEGREES * 2;
101 if (aspect_ratio < 1.0) {
103 return atan(tan(fov/2 * SG_DEGREES_TO_RADIANS) * aspect_ratio) *
104 SG_RADIANS_TO_DEGREES * 2;
115 FGViewer::update (int dt)
118 for ( i = 0; i < dt; i++ ) {
119 if ( fabs(get_goal_view_offset() - get_view_offset()) < 0.05 ) {
120 set_view_offset( get_goal_view_offset() );
123 // move current_view.view_offset towards
124 // current_view.goal_view_offset
125 if ( get_goal_view_offset() > get_view_offset() )
127 if ( get_goal_view_offset() - get_view_offset() < SGD_PI ){
128 inc_view_offset( 0.01 );
130 inc_view_offset( -0.01 );
133 if ( get_view_offset() - get_goal_view_offset() < SGD_PI ){
134 inc_view_offset( -0.01 );
136 inc_view_offset( 0.01 );
139 if ( get_view_offset() > SGD_2PI ) {
140 inc_view_offset( -SGD_2PI );
141 } else if ( get_view_offset() < 0 ) {
142 inc_view_offset( SGD_2PI );
147 for ( i = 0; i < dt; i++ ) {
148 if ( fabs(get_goal_view_tilt() - get_view_tilt()) < 0.05 ) {
149 set_view_tilt( get_goal_view_tilt() );
152 // move current_view.view_tilt towards
153 // current_view.goal_view_tilt
154 if ( get_goal_view_tilt() > get_view_tilt() )
156 if ( get_goal_view_tilt() - get_view_tilt() < SGD_PI ){
157 inc_view_tilt( 0.01 );
159 inc_view_tilt( -0.01 );
162 if ( get_view_tilt() - get_goal_view_tilt() < SGD_PI ){
163 inc_view_tilt( -0.01 );
165 inc_view_tilt( 0.01 );
168 if ( get_view_tilt() > SGD_2PI ) {
169 inc_view_tilt( -SGD_2PI );
170 } else if ( get_view_tilt() < 0 ) {
171 inc_view_tilt( SGD_2PI );