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Norman Vine has split up the GUI code into more managable/logical sections.

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curt 2001-01-08 20:55:16 +00:00
parent 8a7e5eeaf2
commit bff544aada
13 changed files with 1600 additions and 1336 deletions
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116
src/Cockpit/hud.cxx
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@ -86,65 +86,65 @@ static float hud_trans_alpha = 0.67f;
//$$$ begin - added, Neetha, 28 Nov 2k
string name;
int x;
int y;
UINT width;
UINT height;
float factor;
float span_units;
float division_units;
float minor_division = 0;
UINT screen_hole;
UINT lbl_pos;
bool working;
string loadfn;
UINT options;
float maxValue;
float minValue;
float scaling;
UINT major_divs;
UINT minor_divs;
UINT modulator;
int dp_showing = 0;
string label_format;
string prelabel;
string postlabel;
int justi;
int blinking;
float maxBankAngle;
float maxSlipAngle;
UINT gap_width;
bool latitude;
bool longitude;
bool tick_bottom;
bool tick_top;
bool tick_right;
bool tick_left;
bool cap_bottom;
bool cap_top;
bool cap_right;
bool cap_left;
float marker_off;
string type;
bool enable_pointer;
string type_pointer;
bool frl_spot;
bool target;
bool vel_vector;
bool drift;
bool alpha;
bool energy;
bool climb_dive;
bool glide;
float glide_slope_val;
bool worm_energy;
bool waypoint;
static string name;
static int x;
static int y;
static UINT width;
static UINT height;
static float factor;
static float span_units;
static float division_units;
static float minor_division = 0;
static UINT screen_hole;
static UINT lbl_pos;
static bool working;
static string loadfn;
static UINT options;
static float maxValue;
static float minValue;
static float scaling;
static UINT major_divs;
static UINT minor_divs;
static UINT modulator;
static int dp_showing = 0;
static string label_format;
static string prelabel;
static string postlabel;
static int justi;
static int blinking;
static float maxBankAngle;
static float maxSlipAngle;
static UINT gap_width;
static bool latitude;
static bool longitude;
static bool tick_bottom;
static bool tick_top;
static bool tick_right;
static bool tick_left;
static bool cap_bottom;
static bool cap_top;
static bool cap_right;
static bool cap_left;
static float marker_off;
static string type;
static bool enable_pointer;
static string type_pointer;
static bool frl_spot;
static bool target;
static bool vel_vector;
static bool drift;
static bool alpha;
static bool energy;
static bool climb_dive;
static bool glide;
static float glide_slope_val;
static bool worm_energy;
static bool waypoint;
FLTFNPTR load_fn;
fgLabelJust justification;
const char *pre_label_string = 0;
const char *post_label_string = 0;
static FLTFNPTR load_fn;
static fgLabelJust justification;
static const char *pre_label_string = 0;
static const char *post_label_string = 0;
int readHud( istream &input );
int readInstrument ( const SGPropertyNode * node);

8
src/GUI/Makefile.am
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@ -1,5 +1,11 @@
noinst_LIBRARIES = libGUI.a
libGUI_a_SOURCES = gui.cxx gui.h
libGUI_a_SOURCES = \
apt_dlg.cxx apt_dlg.hxx \
gui.cxx gui.h \
gui_local.cxx gui_local.hxx \
mouse.cxx \
net_dlg.cxx net_dlg.hxx \
trackball.c trackball.h
INCLUDES += -I$(top_srcdir) -I$(top_srcdir)/src

147
src/GUI/apt_dlg.cxx Normal file
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@ -0,0 +1,147 @@
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <simgear/compiler.h>
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <stdlib.h>
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/misc/fgpath.hxx>
#include <Include/general.hxx>
#include <GL/glut.h>
#include <simgear/xgl/xgl.h>
#include <Airports/simple.hxx>
#include <FDM/flight.hxx>
#include <Main/fg_init.hxx>
#include <Main/globals.hxx>
#include <Main/options.hxx>
//#include <Time/fg_time.hxx>
#include "gui.h"
#include "gui_local.hxx"
/// The beginnings of teleportation :-)
// Needs cleaning up but works
// These statics should disapear when this is a class
static puDialogBox *AptDialog = 0;
static puFrame *AptDialogFrame = 0;
static puText *AptDialogMessage = 0;
static puInput *AptDialogInput = 0;
static char NewAirportId[16];
static char NewAirportLabel[] = "Enter New Airport ID";
static puOneShot *AptDialogOkButton = 0;
static puOneShot *AptDialogCancelButton = 0;
static puOneShot *AptDialogResetButton = 0;
void AptDialog_Cancel(puObject *)
{
FG_POP_PUI_DIALOG( AptDialog );
}
void AptDialog_OK (puObject *)
{
FGPath path( globals->get_options()->get_fg_root() );
path.append( "Airports" );
path.append( "simple.mk4" );
FGAirports airports( path.c_str() );
FGAirport a;
int freeze = globals->get_freeze();
if(!freeze)
globals->set_freeze( true );
char *s;
AptDialogInput->getValue(&s);
string AptId(s);
cout << "AptDialog_OK " << AptId << " " << AptId.length() << endl;
AptDialog_Cancel( NULL );
if ( AptId.length() ) {
// set initial position from airport id
FG_LOG( FG_GENERAL, FG_INFO,
"Attempting to set starting position from airport code "
<< AptId );
if ( airports.search( AptId, &a ) )
{
globals->get_options()->set_airport_id( AptId.c_str() );
globals->get_options()->set_altitude( -9999.0 );
// fgSetPosFromAirportID( AptId );
fgSetPosFromAirportIDandHdg( AptId,
cur_fdm_state->get_Psi() * RAD_TO_DEG);
BusyCursor(0);
fgReInitSubsystems();
BusyCursor(1);
} else {
AptId += " not in database.";
mkDialog(AptId.c_str());
}
}
if(!freeze)
globals->set_freeze( false );
}
void AptDialog_Reset(puObject *)
{
// strncpy( NewAirportId, globals->get_options()->get_airport_id().c_str(), 16 );
sprintf( NewAirportId, "%s", globals->get_options()->get_airport_id().c_str() );
AptDialogInput->setValue ( NewAirportId );
AptDialogInput->setCursor( 0 ) ;
}
void NewAirport(puObject *cb)
{
// strncpy( NewAirportId, globals->get_options()->get_airport_id().c_str(), 16 );
sprintf( NewAirportId, "%s", globals->get_options()->get_airport_id().c_str() );
// cout << "NewAirport " << NewAirportId << endl;
AptDialogInput->setValue( NewAirportId );
FG_PUSH_PUI_DIALOG( AptDialog );
}
void NewAirportInit(void)
{
sprintf( NewAirportId, "%s", globals->get_options()->get_airport_id().c_str() );
int len = 150 - puGetStringWidth( puGetDefaultLabelFont(),
NewAirportLabel ) / 2;
AptDialog = new puDialogBox (150, 50);
{
AptDialogFrame = new puFrame (0,0,350, 150);
AptDialogMessage = new puText (len, 110);
AptDialogMessage -> setLabel (NewAirportLabel);
AptDialogInput = new puInput (50, 70, 300, 100);
AptDialogInput -> setValue (NewAirportId);
AptDialogInput -> acceptInput();
AptDialogOkButton = new puOneShot (50, 10, 110, 50);
AptDialogOkButton -> setLegend (gui_msg_OK);
AptDialogOkButton -> setCallback (AptDialog_OK);
AptDialogOkButton -> makeReturnDefault(TRUE);
AptDialogCancelButton = new puOneShot (140, 10, 210, 50);
AptDialogCancelButton -> setLegend (gui_msg_CANCEL);
AptDialogCancelButton -> setCallback (AptDialog_Cancel);
AptDialogResetButton = new puOneShot (240, 10, 300, 50);
AptDialogResetButton -> setLegend (gui_msg_RESET);
AptDialogResetButton -> setCallback (AptDialog_Reset);
}
cout << "NewAirportInit " << NewAirportId << endl;
FG_FINALIZE_PUI_DIALOG( AptDialog );
}

7
src/GUI/apt_dlg.hxx Normal file
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@ -0,0 +1,7 @@
#include <plib/pu.h>
extern void AptDialog_Cancel(puObject *);
extern void AptDialog_OK (puObject *);
extern void AptDialog_Reset(puObject *);
extern void NewAirport(puObject *cb);
extern void NewAirportInit(void);

1297
src/GUI/gui.cxx
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File diff suppressed because it is too large Load diff

17
src/GUI/gui.h
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@ -28,13 +28,8 @@
#include <GL/glut.h> // needed before pu.h
#include <plib/pu.h> // plib include
// gui.cxx
extern void guiInit();
extern void guiMotionFunc ( int x, int y );
extern void guiMouseFunc(int button, int updown, int x, int y);
extern void maybeToggleMouse( void );
extern void BusyCursor( int restore );
extern void CenterView( void );
extern void guiToggleMenu(void);
extern void mkDialog(const char *txt);
extern void ConfirmExitDialog(void);
@ -43,6 +38,7 @@ extern void fgDumpSnapShot();
extern puFont guiFnt;
extern fntTexFont *guiFntHandle;
extern int gui_menu_on;
// GLOBAL COMMON DIALOG BOX TEXT STRINGS
extern char *gui_msg_OK; // "OK"
@ -51,6 +47,15 @@ extern char *gui_msg_YES; // "YES"
extern char *gui_msg_CANCEL; // "CANCEL"
extern char *gui_msg_RESET; // "RESET"
// mouse.cxx
extern void guiMotionFunc ( int x, int y );
extern void guiMouseFunc(int button, int updown, int x, int y);
extern void maybeToggleMouse( void );
extern void BusyCursor( int restore );
extern void CenterView( void );
extern void TurnCursorOn( void );
extern void TurnCursorOff( void );
// MACROS TO HELP KEEP PUI LIVE INTERFACE STACK IN SYNC
// These insure that the mouse is active when dialog is shown
// and try to the maintain the original mouse state when hidden

44
src/GUI/gui_local.cxx Normal file
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@ -0,0 +1,44 @@
#include <GL/glut.h> // needed before pu.h
#include <plib/pu.h> // plib include
#include <Main/fg_init.hxx>
#include "gui.h"
#include "trackball.h"
// FOR MOUSE VIEW MODE
// stashed trackball(_quat0, 0.0, 0.0, 0.0, 0.0);
static float _quat0[4];
float lastGuiQuat[4];
float curGuiQuat[4];
// To apply our mouse rotation quat to VIEW
// sgPreMultMat4( VIEW, GuiQuat_mat);
// This is here temporarily should be in views.hxx
float GuiQuat_mat[4][4];
void Quat0( void ) {
curGuiQuat[0] = _quat0[0];
curGuiQuat[1] = _quat0[1];
curGuiQuat[2] = _quat0[2];
curGuiQuat[3] = _quat0[3];
}
void initMouseQuat(void) {
trackball(_quat0, 0.0, 0.0, 0.0, 0.0);
Quat0();
build_rotmatrix(GuiQuat_mat, curGuiQuat);
}
void reInit(puObject *cb)
{
BusyCursor(0);
Quat0();
build_rotmatrix(GuiQuat_mat, curGuiQuat);
fgReInitSubsystems();
BusyCursor(1);
}

19
src/GUI/gui_local.hxx Normal file
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@ -0,0 +1,19 @@
#include "trackball.h"
typedef enum {
MOUSE_POINTER,
MOUSE_YOKE,
MOUSE_VIEW
} MouseMode;
extern MouseMode mouse_mode;
extern float lastGuiQuat[4];
extern float curGuiQuat[4];
extern float GuiQuat_mat[4][4];
extern void initMouseQuat( void );
extern void Quat0( void );
class puObject;
extern void reInit(puObject *cb);

562
src/GUI/mouse.cxx Normal file
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@ -0,0 +1,562 @@
/**************************************************************************
* gui.cxx
*
* Written 1998 by Durk Talsma, started Juni, 1998. For the flight gear
* project.
*
* Additional mouse supported added by David Megginson, 1999.
*
* 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.
*
* $Id$
**************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <simgear/compiler.h>
#ifdef FG_MATH_EXCEPTION_CLASH
# include <math.h>
#endif
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <GL/glut.h>
#include <simgear/xgl/xgl.h>
#if defined(FX) && defined(XMESA)
# include <GL/xmesa.h>
#endif
#include STL_STRING
#include <stdlib.h>
#include <string.h>
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/misc/fgpath.hxx>
#include <simgear/screen/screen-dump.hxx>
#include <Include/general.hxx>
//#include <Include/fg_memory.h>
#include <Aircraft/aircraft.hxx>
#include <Airports/simple.hxx>
//#include <Autopilot/auto_gui.hxx>
#include <Autopilot/newauto.hxx>
#include <Cockpit/panel.hxx>
#include <Controls/controls.hxx>
#include <FDM/flight.hxx>
#include <Main/options.hxx>
#include <Main/fg_init.hxx>
//#include <Main/views.hxx>
//#include <Network/network.h>
//#include <Time/fg_time.hxx>
#if defined( WIN32 ) && !defined( __CYGWIN__ )
# include <simgear/screen/win32-printer.h>
# include <simgear/screen/GlBitmaps.h>
#endif
#include "gui.h"
#include "gui_local.hxx"
FG_USING_STD(string);
#ifndef FG_HAVE_NATIVE_SGI_COMPILERS
FG_USING_STD(cout);
#endif
#if defined(WIN32) || defined(__CYGWIN32__)
#define WIN32_CURSOR_TWEAKS
#elif (GLUT_API_VERSION >= 4 || GLUT_XLIB_IMPLEMENTATION >= 9)
#define X_CURSOR_TWEAKS
#endif
/* --------------------------------------------------------------------
Mouse stuff
---------------------------------------------------------------------*/
static int _mX = 0;
static int _mY = 0;
static int _savedX = 0;
static int _savedY = 0;
static int last_buttons = 0 ;
static int mouse_active = 0;
static int mouse_joystick_control = 0;
//static time_t mouse_off_time;
//static int mouse_timed_out;
// to allow returning to previous view
// on second left click in MOUSE_VIEW mode
// This has file scope so that it can be reset
// if the little rodent is moved NHV
static int _mVtoggle;
// we break up the glutGetModifiers return mask
// once per loop and stash what we need in these
static int glut_active_shift;
static int glut_active_ctrl;
static int glut_active_alt;
// uncomment this for view to exactly follow mouse in MOUSE_VIEW mode
// else smooth out the view panning to .01 radian per frame
// see view_offset smoothing mechanism in main.cxx
#define NO_SMOOTH_MOUSE_VIEW
// uncomment following to
#define RESET_VIEW_ON_LEAVING_MOUSE_VIEW
/* --------------------------------------------------------------------
Support for mouse as control yoke (david@megginson.com)
- right button toggles between pointer and yoke
- horizontal drag with no buttons moves ailerons
- vertical drag with no buttons moves elevators
- horizontal drag with left button moves brakes (left=on)
- vertical drag with left button moves throttle (up=more)
- horizontal drag with middle button moves rudder
- vertical drag with middle button moves trim
For the *_sensitivity variables, a lower number means more sensitive.
TODO: figure out how to keep pointer from leaving window in yoke mode.
TODO: add thresholds and null zones
TODO: sensitivity should be configurable at user option.
TODO: allow differential braking (this will be useful if FlightGear
ever supports tail-draggers like the DC-3)
---------------------------------------------------------------------*/
MouseMode mouse_mode = MOUSE_POINTER;
static double aileron_sensitivity = 1.0/500.0;
static double elevator_sensitivity = 1.0/500.0;
static double brake_sensitivity = 1.0/250.0;
static double throttle_sensitivity = 1.0/250.0;
static double rudder_sensitivity = 1.0/500.0;
static double trim_sensitivity = 1.0/1000.0;
static inline int guiGetMouseButton(void)
{
return last_buttons;
}
static inline void guiGetMouse(int *x, int *y)
{
*x = _mX;
*y = _mY;
};
static inline int left_button( void ) {
return( last_buttons & (1 << GLUT_LEFT_BUTTON) );
}
static inline int middle_button( void ) {
return( last_buttons & (1 << GLUT_MIDDLE_BUTTON) );
}
static inline int right_button( void ) {
return( last_buttons & (1 << GLUT_RIGHT_BUTTON) );
}
void TurnCursorOn( void )
{
mouse_active = ~0;
#if defined(WIN32_CURSOR_TWEAKS)
switch (mouse_mode) {
case MOUSE_POINTER:
glutSetCursor(GLUT_CURSOR_INHERIT);
break;
case MOUSE_YOKE:
glutSetCursor(GLUT_CURSOR_CROSSHAIR);
break;
case MOUSE_VIEW:
glutSetCursor(GLUT_CURSOR_LEFT_RIGHT);
break;
}
#endif
#if defined(X_CURSOR_TWEAKS)
glutWarpPointer( globals->get_options()->get_xsize()/2,
globals->get_options()->get_ysize()/2);
#endif
}
void TurnCursorOff( void )
{
mouse_active = 0;
#if defined(WIN32_CURSOR_TWEAKS)
glutSetCursor(GLUT_CURSOR_NONE);
#elif defined(X_CURSOR_TWEAKS)
glutWarpPointer( globals->get_options()->get_xsize(),
globals->get_options()->get_ysize());
#endif
}
void maybeToggleMouse( void )
{
#if defined(WIN32_CURSOR_TWEAKS)
static int first_time = ~0;
static int mouse_changed = 0;
if ( first_time ) {
if(!mouse_active) {
mouse_changed = ~mouse_changed;
TurnCursorOn();
}
} else {
if( mouse_mode != MOUSE_POINTER )
return;
if( mouse_changed ) {
mouse_changed = ~mouse_changed;
if(mouse_active) {
TurnCursorOff();
}
}
}
first_time = ~first_time;
#endif // #ifdef WIN32
}
// Call with FALSE to init and TRUE to restore
void BusyCursor( int restore )
{
static GLenum cursor = (GLenum) 0;
if( restore ) {
glutSetCursor(cursor);
} else {
cursor = (GLenum) glutGet( (GLenum) GLUT_WINDOW_CURSOR );
#if defined(WIN32_CURSOR_TWEAKS)
TurnCursorOn();
#endif
glutSetCursor( GLUT_CURSOR_WAIT );
}
}
// Center the view offsets
void CenterView( void ) {
if( mouse_mode = MOUSE_VIEW ) {
mouse_mode = MOUSE_POINTER;
_savedX = globals->get_options()->get_xsize()/2;
_savedY = globals->get_options()->get_ysize()/2;
_mVtoggle = 0;
Quat0();
build_rotmatrix(GuiQuat_mat, curGuiQuat);
glutSetCursor(GLUT_CURSOR_INHERIT);
// Is this necessary ??
if( !gui_menu_on ) TurnCursorOff();
glutWarpPointer( _savedX, _savedY );
}
globals->get_current_view()->set_goal_view_offset(0.0);
globals->get_current_view()->set_view_offset(0.0);
}
void guiMotionFunc ( int x, int y )
{
int ww, wh, need_warp = 0;
float W, H;
double offset;
if (mouse_mode == MOUSE_POINTER) {
puMouse ( x, y ) ;
glutPostRedisplay () ;
} else {
if( x == _mX && y == _mY)
return;
// reset left click MOUSE_VIEW toggle feature
_mVtoggle = 0;
ww = globals->get_options()->get_xsize();
wh = globals->get_options()->get_ysize();
switch (mouse_mode) {
case MOUSE_YOKE:
if( !mouse_joystick_control ) {
mouse_joystick_control = 1;
globals->get_options()->set_control_mode( FGOptions::FG_MOUSE );
} else {
if ( left_button() ) {
offset = (_mX - x) * brake_sensitivity;
controls.move_brake(FGControls::ALL_WHEELS, offset);
offset = (_mY - y) * throttle_sensitivity;
controls.move_throttle(FGControls::ALL_ENGINES, offset);
} else if ( right_button() ) {
if( ! current_autopilot->get_HeadingEnabled() ) {
offset = (x - _mX) * rudder_sensitivity;
controls.move_rudder(offset);
}
if( ! current_autopilot->get_AltitudeEnabled() ) {
offset = (_mY - y) * trim_sensitivity;
controls.move_elevator_trim(offset);
}
} else {
if( ! current_autopilot->get_HeadingEnabled() ) {
offset = (x - _mX) * aileron_sensitivity;
controls.move_aileron(offset);
}
if( ! current_autopilot->get_AltitudeEnabled() ) {
offset = (_mY - y) * elevator_sensitivity;
controls.move_elevator(offset);
}
}
}
// Keep the mouse in the window.
if (x < 5 || x > ww-5 || y < 5 || y > wh-5) {
x = ww / 2;
y = wh / 2;
need_warp = 1;
}
break;
case MOUSE_VIEW:
if( y <= 0 ) {
#define CONTRAINED_MOUSE_VIEW_Y
#ifdef CONTRAINED_MOUSE_VIEW_Y
y = 1;
#else
y = wh-2;
#endif // CONTRAINED_MOUSE_VIEW_Y
need_warp = 1;
} else if( y >= wh-1) {
#ifdef CONTRAINED_MOUSE_VIEW_Y
y = wh-2;
#else
y = 1;
#endif // CONTRAINED_MOUSE_VIEW_Y
need_warp = 1;
}
// wrap MOUSE_VIEW mode cursor x position
if ( x <= 0 ) {
need_warp = 1;
x = ww-2;
} else if ( x >= ww-1 ) {
need_warp = 1;
x = 1;
}
// try to get FG_PI movement in each half of screen
// do spherical pan
W = ww;
H = wh;
if( middle_button() ) {
trackball(lastGuiQuat,
(2.0f * _mX - W) / W,
0, //(H - 2.0f * y) / H, // 3
(2.0f * x - W) / W,
0 //(H - 2.0f * _mY) / H // 1
);
x = _mX;
y = _mY;
need_warp = 1;
} else {
trackball(lastGuiQuat,
0, //(2.0f * _mX - W) / W, // 0
(H - 2.0f * y) / H, // 3
0, //(2.0f * x - W) / W, // 2
(H - 2.0f * _mY) / H // 1
);
}
add_quats(lastGuiQuat, curGuiQuat, curGuiQuat);
build_rotmatrix(GuiQuat_mat, curGuiQuat);
// do horizontal pan
// this could be done in above quat
// but requires redoing view pipeline
offset = globals->get_current_view()->get_goal_view_offset();
offset += ((_mX - x) * FG_2PI / W );
while (offset < 0.0) {
offset += FG_2PI;
}
while (offset > FG_2PI) {
offset -= FG_2PI;
}
globals->get_current_view()->set_goal_view_offset(offset);
#ifdef NO_SMOOTH_MOUSE_VIEW
globals->get_current_view()->set_view_offset(offset);
#endif
break;
default:
break;
}
}
if( need_warp)
glutWarpPointer(x, y);
// Record the new mouse position.
_mX = x;
_mY = y;
}
void guiMouseFunc(int button, int updown, int x, int y)
{
int glutModifiers;
// private MOUSE_VIEW state variables
// to allow alternate left clicks in MOUSE_VIEW mode
// to toggle between current offsets and straight ahead
// uses _mVtoggle
static int _mVx, _mVy, _Vx, _Vy;
static float _quat[4];
static double _view_offset;
// general purpose variables
double offset;
glutModifiers = glutGetModifiers();
glut_active_shift = glutModifiers & GLUT_ACTIVE_SHIFT;
glut_active_ctrl = glutModifiers & GLUT_ACTIVE_CTRL;
glut_active_alt = glutModifiers & GLUT_ACTIVE_ALT;
// Was the left button pressed?
if (updown == GLUT_DOWN ) {
if( button == GLUT_LEFT_BUTTON)
{
switch (mouse_mode) {
case MOUSE_POINTER:
break;
case MOUSE_YOKE:
break;
case MOUSE_VIEW:
if(_mVtoggle) {
// resume previous view offsets
_mX = _mVx;
_mY = _mVy;
x = _Vx;
y = _Vy;
curGuiQuat[0] = _quat[0];
curGuiQuat[1] = _quat[1];
curGuiQuat[2] = _quat[2];
curGuiQuat[3] = _quat[3];
globals->get_current_view()->set_goal_view_offset(_view_offset);
#ifdef NO_SMOOTH_MOUSE_VIEW
globals->get_current_view()->set_view_offset(_view_offset);
#endif
} else {
// center view
_mVx = _mX;
_mVy = _mY;
_Vx = x;
_Vy = y;
_quat[0] = curGuiQuat[0];
_quat[1] = curGuiQuat[1];
_quat[2] = curGuiQuat[2];
_quat[3] = curGuiQuat[3];
x = globals->get_options()->get_xsize()/2;
y = globals->get_options()->get_ysize()/2;
Quat0();
_view_offset =
globals->get_current_view()->get_goal_view_offset();
globals->get_current_view()->set_goal_view_offset(0.0);
#ifdef NO_SMOOTH_MOUSE_VIEW
globals->get_current_view()->set_view_offset(0.0);
#endif
}
glutWarpPointer( x , y);
build_rotmatrix(GuiQuat_mat, curGuiQuat);
_mVtoggle = ~_mVtoggle;
break;
}
}else if ( button == GLUT_RIGHT_BUTTON) {
switch (mouse_mode) {
case MOUSE_POINTER:
mouse_mode = MOUSE_YOKE;
mouse_joystick_control = 0;
_savedX = x;
_savedY = y;
// start with zero point in center of screen
_mX = globals->get_options()->get_xsize()/2;
_mY = globals->get_options()->get_ysize()/2;
// try to have the MOUSE_YOKE position
// reflect the current stick position
offset = controls.get_aileron();
x = _mX - (int)(offset * aileron_sensitivity);
offset = controls.get_elevator();
y = _mY - (int)(offset * elevator_sensitivity);
glutSetCursor(GLUT_CURSOR_CROSSHAIR);
FG_LOG( FG_INPUT, FG_INFO, "Mouse in yoke mode" );
break;
case MOUSE_YOKE:
mouse_mode = MOUSE_VIEW;
globals->get_options()->set_control_mode( FGOptions::FG_JOYSTICK );
x = globals->get_options()->get_xsize()/2;
y = globals->get_options()->get_ysize()/2;
_mVtoggle = 0;
Quat0();
build_rotmatrix(GuiQuat_mat, curGuiQuat);
glutSetCursor(GLUT_CURSOR_LEFT_RIGHT);
FG_LOG( FG_INPUT, FG_INFO, "Mouse in view mode" );
break;
case MOUSE_VIEW:
mouse_mode = MOUSE_POINTER;
x = _savedX;
y = _savedY;
#ifdef RESET_VIEW_ON_LEAVING_MOUSE_VIEW
Quat0();
build_rotmatrix(GuiQuat_mat, curGuiQuat);
globals->get_current_view()->set_goal_view_offset(0.0);
#ifdef NO_SMOOTH_MOUSE_VIEW
globals->get_current_view()->set_view_offset(0.0);
#endif
#endif // RESET_VIEW_ON_LEAVING_MOUSE_VIEW
glutSetCursor(GLUT_CURSOR_INHERIT);
if(!gui_menu_on)
TurnCursorOff();
FG_LOG( FG_INPUT, FG_INFO, "Mouse in pointer mode" );
break;
}
glutWarpPointer( x, y );
} // END RIGHT BUTTON
} // END UPDOWN == GLUT_DOWN
// Note which button is pressed.
if ( updown == GLUT_DOWN ) {
last_buttons |= ( 1 << button ) ;
} else {
last_buttons &= ~( 1 << button ) ;
}
// If we're in pointer mode, let PUI
// know what's going on.
if (mouse_mode == MOUSE_POINTER) {
if (!puMouse (button, updown, x,y)) {
current_panel->doMouseAction(button, updown, x, y);
}
}
// Register the new position (if it
// hasn't been registered already).
_mX = x;
_mY = y;
glutPostRedisplay ();
}

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// net_dlg.cxx -- data structures for initializing & managing network.
//
// Written by Oliver Delise, started May 1999.
//
// Copyleft (C) 1999 Oliver Delise - delise@rp-plus.de
//
// 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.
//
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <simgear/compiler.h>
#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <stdlib.h>
#include <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/misc/fgpath.hxx>
#include <Include/general.hxx>
#include <simgear/xgl/xgl.h>
#include <Main/globals.hxx>
#include <Main/options.hxx>
#include <NetworkOLK/network.h>
#include "gui.h"
#include "net_dlg.hxx"
/// The beginnings of networking :-)
// Needs cleaning up but works
// These statics should disapear when this is a class
static puDialogBox *NetIdDialog = 0;
static puFrame *NetIdDialogFrame = 0;
static puText *NetIdDialogMessage = 0;
static puInput *NetIdDialogInput = 0;
static char NewNetId[16];
static char NewNetIdLabel[] = "Enter New Callsign";
extern char *fgd_callsign;
static puOneShot *NetIdDialogOkButton = 0;
static puOneShot *NetIdDialogCancelButton = 0;
void NetIdDialog_Cancel(puObject *)
{
FG_POP_PUI_DIALOG( NetIdDialog );
}
void NetIdDialog_OK (puObject *)
{
string NetId;
bool freeze = globals->get_freeze();
if(!freeze)
globals->set_freeze( true );
/*
The following needs some cleanup because
"string options.NetId" and "char *net_callsign"
*/
NetIdDialogInput->getValue(&net_callsign);
NetId = net_callsign;
NetIdDialog_Cancel( NULL );
globals->get_options()->set_net_id( NetId.c_str() );
strcpy( fgd_callsign, net_callsign);
// strcpy( fgd_callsign, globals->get_options()->get_net_id().c_str());
/* Entering a callsign indicates : user wants Net HUD Info */
net_hud_display = 1;
if(!freeze)
globals->set_freeze( false );
}
void NewCallSign(puObject *cb)
{
sprintf( NewNetId, "%s", globals->get_options()->get_net_id().c_str() );
// sprintf( NewNetId, "%s", fgd_callsign );
NetIdDialogInput->setValue( NewNetId );
FG_PUSH_PUI_DIALOG( NetIdDialog );
}
void NewNetIdInit(void)
{
sprintf( NewNetId, "%s", globals->get_options()->get_net_id().c_str() );
// sprintf( NewNetId, "%s", fgd_callsign );
int len = 150 - puGetStringWidth( puGetDefaultLabelFont(),
NewNetIdLabel ) / 2;
NetIdDialog = new puDialogBox (150, 50);
{
NetIdDialogFrame = new puFrame (0,0,350, 150);
NetIdDialogMessage = new puText (len, 110);
NetIdDialogMessage -> setLabel (NewNetIdLabel);
NetIdDialogInput = new puInput (50, 70, 300, 100);
NetIdDialogInput -> setValue (NewNetId);
NetIdDialogInput -> acceptInput();
NetIdDialogOkButton = new puOneShot (50, 10, 110, 50);
NetIdDialogOkButton -> setLegend (gui_msg_OK);
NetIdDialogOkButton -> setCallback (NetIdDialog_OK);
NetIdDialogOkButton -> makeReturnDefault(TRUE);
NetIdDialogCancelButton = new puOneShot (240, 10, 300, 50);
NetIdDialogCancelButton -> setLegend (gui_msg_CANCEL);
NetIdDialogCancelButton -> setCallback (NetIdDialog_Cancel);
}
FG_FINALIZE_PUI_DIALOG( NetIdDialog );
}
/*************** Deamon communication **********/
// These statics should disapear when this is a class
static puDialogBox *NetFGDDialog = 0;
static puFrame *NetFGDDialogFrame = 0;
static puText *NetFGDDialogMessage = 0;
//static puInput *NetFGDDialogInput = 0;
//static char NewNetId[16];
static char NewNetFGDLabel[] = "Scan for deamon ";
static char NewFGDHost[64] = "olk.mcp.de";
static int NewFGDPortLo = 10000;
static int NewFGDPortHi = 10001;
//extern char *fgd_callsign;
extern u_short base_port, end_port;
extern int fgd_ip, verbose, current_port;
extern char *fgd_host;
static puOneShot *NetFGDDialogOkButton = 0;
static puOneShot *NetFGDDialogCancelButton = 0;
static puOneShot *NetFGDDialogScanButton = 0;
static puInput *NetFGDHostDialogInput = 0;
static puInput *NetFGDPortLoDialogInput = 0;
static puInput *NetFGDPortHiDialogInput = 0;
void NetFGDDialog_Cancel(puObject *)
{
FG_POP_PUI_DIALOG( NetFGDDialog );
}
void NetFGDDialog_OK (puObject *)
{
char *NetFGD;
bool freeze = globals->get_freeze();
if(!freeze)
globals->set_freeze( true );
NetFGDHostDialogInput->getValue( &NetFGD );
strcpy( fgd_host, NetFGD);
NetFGDPortLoDialogInput->getValue( (int *) &base_port );
NetFGDPortHiDialogInput->getValue( (int *) &end_port );
NetFGDDialog_Cancel( NULL );
if(!freeze)
globals->set_freeze( false );
}
void NetFGDDialog_SCAN (puObject *)
{
char *NetFGD;
int fgd_port;
bool freeze = globals->get_freeze();
if(!freeze)
globals->set_freeze( true );
// printf("Vor getvalue %s\n");
NetFGDHostDialogInput->getValue( &NetFGD );
// printf("Vor strcpy %s\n", (char *) NetFGD);
strcpy( fgd_host, NetFGD);
NetFGDPortLoDialogInput->getValue( (int *) &base_port );
NetFGDPortHiDialogInput->getValue( (int *) &end_port );
printf("FGD: %s Port-Start: %d Port-End: %d\n", fgd_host,
base_port, end_port);
net_resolv_fgd(fgd_host);
printf("Resolve : %d\n", net_r);
if(!freeze)
globals->set_freeze( false );
if ( net_r == 0 ) {
fgd_port = 10000;
strcpy( fgd_name, "");
for( current_port = base_port; ( current_port <= end_port); current_port++) {
fgd_send_com("0" , FGFS_host);
sprintf( NewNetFGDLabel , "Scanning for deamon Port: %d", current_port);
printf("FGD: searching %s\n", fgd_name);
if ( strcmp( fgd_name, "") != 0 ) {
sprintf( NewNetFGDLabel , "Found %s at Port: %d",
fgd_name, current_port);
fgd_port = current_port;
current_port = end_port+1;
}
}
current_port = end_port = base_port = fgd_port;
}
NetFGDDialog_Cancel( NULL );
}
void net_fgd_scan(puObject *cb)
{
NewFGDPortLo = base_port;
NewFGDPortHi = end_port;
strcpy( NewFGDHost, fgd_host);
NetFGDPortLoDialogInput->setValue( NewFGDPortLo );
NetFGDPortHiDialogInput->setValue( NewFGDPortHi );
NetFGDHostDialogInput->setValue( NewFGDHost );
FG_PUSH_PUI_DIALOG( NetFGDDialog );
}
void NewNetFGDInit(void)
{
// sprintf( NewNetId, "%s", globals->get_options()->get_net_id().c_str() );
// sprintf( NewNetId, "%s", fgd_callsign );
int len = 170 - puGetStringWidth( puGetDefaultLabelFont(),
NewNetFGDLabel ) / 2;
NetFGDDialog = new puDialogBox (310, 30);
{
NetFGDDialogFrame = new puFrame (0,0,320, 170);
NetFGDDialogMessage = new puText (len, 140);
NetFGDDialogMessage -> setLabel (NewNetFGDLabel);
NetFGDPortLoDialogInput = new puInput (50, 70, 127, 100);
NetFGDPortLoDialogInput -> setValue (NewFGDPortLo);
NetFGDPortLoDialogInput -> acceptInput();
NetFGDPortHiDialogInput = new puInput (199, 70, 275, 100);
NetFGDPortHiDialogInput -> setValue (NewFGDPortHi);
NetFGDPortHiDialogInput -> acceptInput();
NetFGDHostDialogInput = new puInput (50, 100, 275, 130);
NetFGDHostDialogInput -> setValue (NewFGDHost);
NetFGDHostDialogInput -> acceptInput();
NetFGDDialogScanButton = new puOneShot (130, 10, 200, 50);
NetFGDDialogScanButton -> setLegend ("Scan");
NetFGDDialogScanButton -> setCallback (NetFGDDialog_SCAN);
NetFGDDialogScanButton -> makeReturnDefault(FALSE);
NetFGDDialogOkButton = new puOneShot (50, 10, 120, 50);
NetFGDDialogOkButton -> setLegend (gui_msg_OK);
NetFGDDialogOkButton -> setCallback (NetFGDDialog_OK);
NetFGDDialogOkButton -> makeReturnDefault(TRUE);
NetFGDDialogCancelButton = new puOneShot (210, 10, 280, 50);
NetFGDDialogCancelButton -> setLegend (gui_msg_CANCEL);
NetFGDDialogCancelButton -> setCallback (NetFGDDialog_Cancel);
}
FG_FINALIZE_PUI_DIALOG( NetFGDDialog );
}
/*
static void net_display_toggle( puObject *cb)
{
net_hud_display = (net_hud_display) ? 0 : 1;
printf("Toggle net_hud_display : %d\n", net_hud_display);
}
*/
/*************** End Networking **************/

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// net_dlg.hxx -- data structures for initializing & managing network.
//
// Written by Oliver Delise, started May 1999.
//
// Copyleft (C) 1999 Oliver Delise - delise@rp-plus.de
//
// 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.
//
//#ifdef FG_NETWORK_OLK
#include <plib/pu.h>
//#include <NetworkOLK/network.h>
//#include <Network/network.h>
extern void NetIdDialog_Cancel(puObject *);
extern void NewCallSign(puObject *cb);
extern void NetIdDialog_OK (puObject *);
extern void NewNetIdInit(void);
extern void NetFGDDialog_Cancel(puObject *);
extern void NetFGDDialog_OK (puObject *);
extern void NetFGDDialog_SCAN (puObject *);
extern void net_fgd_scan(puObject *cb);
extern void NewNetFGDInit(void);
//#endif // FG_NETWORK_OLK

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/*
* Trackball code:
*
* Implementation of a virtual trackball.
* Implemented by Gavin Bell, lots of ideas from Thant Tessman and
* the August '88 issue of Siggraph's "Computer Graphics," pp. 121-129.
*
* Vector manip code:
*
* Original code from:
* David M. Ciemiewicz, Mark Grossman, Henry Moreton, and Paul Haeberli
*
* Much mucking with by:
* Gavin Bell
*/
#if defined(_WIN32) && !defined( __CYGWIN32__ )
#pragma warning (disable:4244) /* disable bogus conversion warnings */
#endif
#include <math.h>
#include <stdio.h>
#include "trackball.h"
/*
* This size should really be based on the distance from the center of
* rotation to the point on the object underneath the mouse. That
* point would then track the mouse as closely as possible. This is a
* simple example, though, so that is left as an Exercise for the
* Programmer.
*/
#define TRACKBALLSIZE (0.8f)
#define SQRT(x) sqrt(x)
/*
* Local function prototypes (not defined in trackball.h)
*/
static float tb_project_to_sphere(float, float, float);
static void normalize_quat(float [4]);
static void
vzero(float *v)
{
v[0] = 0.0;
v[1] = 0.0;
v[2] = 0.0;
}
static void
vset(float *v, float x, float y, float z)
{
v[0] = x;
v[1] = y;
v[2] = z;
}
static void
vsub(const float *src1, const float *src2, float *dst)
{
dst[0] = src1[0] - src2[0];
dst[1] = src1[1] - src2[1];
dst[2] = src1[2] - src2[2];
}
static void
vcopy(const float *v1, float *v2)
{
register int i;
for (i = 0 ; i < 3 ; i++)
v2[i] = v1[i];
}
static void
vcross(const float *v1, const float *v2, float *cross)
{
float temp[3];
temp[0] = (v1[1] * v2[2]) - (v1[2] * v2[1]);
temp[1] = (v1[2] * v2[0]) - (v1[0] * v2[2]);
temp[2] = (v1[0] * v2[1]) - (v1[1] * v2[0]);
vcopy(temp, cross);
}
static float
vlength(const float *v)
{
float tmp = v[0] * v[0] + v[1] * v[1] + v[2] * v[2];
return SQRT(tmp);
}
static void
vscale(float *v, float div)
{
v[0] *= div;
v[1] *= div;
v[2] *= div;
}
static void
vnormal(float *v)
{
vscale(v,1.0/vlength(v));
}
static float
vdot(const float *v1, const float *v2)
{
return v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2];
}
static void
vadd(const float *src1, const float *src2, float *dst)
{
dst[0] = src1[0] + src2[0];
dst[1] = src1[1] + src2[1];
dst[2] = src1[2] + src2[2];
}
/*
* Given an axis and angle, compute quaternion.
*/
void
axis_to_quat(float a[3], float phi, float q[4])
{
double sinphi2, cosphi2;
double phi2 = phi/2.0;
sinphi2 = sin(phi2);
cosphi2 = cos(phi2);
vnormal(a);
vcopy(a,q);
vscale(q,sinphi2);
q[3] = cosphi2;
}
/*
* Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
* if we are away from the center of the sphere.
*/
static float
tb_project_to_sphere(float r, float x, float y)
{
float d, t, z, tmp;
tmp = x*x + y*y;
d = SQRT(tmp);
if (d < r * 0.70710678118654752440) { /* Inside sphere */
tmp = r*r - d*d;
z = SQRT(tmp);
} else { /* On hyperbola */
t = r / 1.41421356237309504880;
z = t*t / d;
}
return z;
}
/*
* Quaternions always obey: a^2 + b^2 + c^2 + d^2 = 1.0
* If they don't add up to 1.0, dividing by their magnitued will
* renormalize them.
*
* Note: See the following for more information on quaternions:
*
* - Shoemake, K., Animating rotation with quaternion curves, Computer
* Graphics 19, No 3 (Proc. SIGGRAPH'85), 245-254, 1985.
* - Pletinckx, D., Quaternion calculus as a basic tool in computer
* graphics, The Visual Computer 5, 2-13, 1989.
*/
static void
normalize_quat(float q[4])
{
int i;
float mag, tmp;
tmp = q[0]*q[0] + q[1]*q[1] + q[2]*q[2] + q[3]*q[3];
mag = 1.0 / SQRT(tmp);
for (i = 0; i < 4; i++)
q[i] *= mag;
}
/*
* Ok, simulate a track-ball. Project the points onto the virtual
* trackball, then figure out the axis of rotation, which is the cross
* product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
* Note: This is a deformed trackball-- is a trackball in the center,
* but is deformed into a hyperbolic sheet of rotation away from the
* center. This particular function was chosen after trying out
* several variations.
*
* It is assumed that the arguments to this routine are in the range
* (-1.0 ... 1.0)
*/
void
trackball(float q[4], float p1x, float p1y, float p2x, float p2y)
{
float a[3]; /* Axis of rotation */
float phi; /* how much to rotate about axis */
float p1[3], p2[3], d[3];
float t;
if (p1x == p2x && p1y == p2y) {
/* Zero rotation */
vzero(q);
q[3] = 1.0;
return;
}
/*
* First, figure out z-coordinates for projection of P1 and P2 to
* deformed sphere
*/
vset(p1,p1x,p1y,tb_project_to_sphere(TRACKBALLSIZE,p1x,p1y));
vset(p2,p2x,p2y,tb_project_to_sphere(TRACKBALLSIZE,p2x,p2y));
/*
* Now, we want the cross product of P1 and P2
*/
vcross(p2,p1,a);
/*
* Figure out how much to rotate around that axis.
*/
vsub(p1,p2,d);
t = vlength(d) / (2.0*TRACKBALLSIZE);
/*
* Avoid problems with out-of-control values...
*/
if (t > 1.0) t = 1.0;
if (t < -1.0) t = -1.0;
phi = 2.0 * asin(t);
axis_to_quat(a,phi,q);
}
/*
* Given two rotations, e1 and e2, expressed as quaternion rotations,
* figure out the equivalent single rotation and stuff it into dest.
*
* This routine also normalizes the result every RENORMCOUNT times it is
* called, to keep error from creeping in.
*
* NOTE: This routine is written so that q1 or q2 may be the same
* as dest (or each other).
*/
#define RENORMCOUNT 97
void
add_quats(float q1[4], float q2[4], float dest[4])
{
static int count=0;
float t1[4], t2[4], t3[4];
float tf[4];
#if 0
printf("q1 = %f %f %f %f\n", q1[0], q1[1], q1[2], q1[3]);
printf("q2 = %f %f %f %f\n", q2[0], q2[1], q2[2], q2[3]);
#endif
vcopy(q1,t1);
vscale(t1,q2[3]);
vcopy(q2,t2);
vscale(t2,q1[3]);
vcross(q2,q1,t3);
vadd(t1,t2,tf);
vadd(t3,tf,tf);
tf[3] = q1[3] * q2[3] - vdot(q1,q2);
#if 0
printf("tf = %f %f %f %f\n", tf[0], tf[1], tf[2], tf[3]);
#endif
dest[0] = tf[0];
dest[1] = tf[1];
dest[2] = tf[2];
dest[3] = tf[3];
if (++count > RENORMCOUNT) {
count = 0;
normalize_quat(dest);
}
}
/*
* Build a rotation matrix, given a quaternion rotation.
*
*/
void build_rotmatrix(float m[4][4], float q[4])
{
m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
m[0][1] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
m[0][2] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
m[0][3] = 0.0;
m[1][0] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
m[1][1]= 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
m[1][2] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
m[1][3] = 0.0;
m[2][0] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
m[2][1] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
m[2][3] = 0.0;
m[3][0] = 0.0;
m[3][1] = 0.0;
m[3][2] = 0.0;
m[3][3] = 1.0;
}
void build_transposed_rotmatrix(float m[4][4], float q[4])
{
m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
m[0][1] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
m[0][2] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
m[0][3] = 0.0;
m[1][0] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
m[1][1] = 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
m[1][2] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
m[1][3] = 0.0;
m[2][0] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
m[2][1] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
m[2][3] = 0.0;
m[3][0] = 0.0;
m[3][1] = 0.0;
m[3][2] = 0.0;
m[3][3] = 1.0;
}

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/*
* trackball.h
* A virtual trackball implementation
* Written by Gavin Bell for Silicon Graphics, November 1988.
*/
#ifndef _TRACKBALL_H
#define _TRACKBALL_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* Pass the x and y coordinates of the last and current positions of
* the mouse, scaled so they are from (-1.0 ... 1.0).
*
* The resulting rotation is returned as a quaternion rotation in the
* first paramater.
*/
void
trackball(float q[4], float p1x, float p1y, float p2x, float p2y);
/*
* Given two quaternions, add them together to get a third quaternion.
* Adding quaternions to get a compound rotation is analagous to adding
* translations to get a compound translation. When incrementally
* adding rotations, the first argument here should be the new
* rotation, the second and third the total rotation (which will be
* over-written with the resulting new total rotation).
*/
void add_quats(float *q1, float *q2, float *dest);
/*
* A useful function, builds a rotation matrix in Matrix based on
* given quaternion.
*/
void build_rotmatrix(float m[4][4], float q[4]);
void build_transposed_rotmatrix(float m[4][4], float q[4]);
/*
* This function computes a quaternion based on an axis (defined by
* the given vector) and an angle about which to rotate. The angle is
* expressed in radians. The result is put into the third argument.
*/
void axis_to_quat(float a[3], float phi, float q[4]);
#ifdef __cplusplus
}
#endif
#endif /* _TRACKBALL_H */