****************************************************************************
*** flythrough "README" ****************************************************
****************************************************************************
 
 MODULE:       togl_flythrough.c 0.993

 AUTHOR(S):    ACS - Massimo Cuomo - m.cuomo at acsys.it

 PURPOSE:	"Immersive" navigation by means of mouse buttons and movement
 		 In conjunction with flythrough.tcl

New (new) and modified (mod) files for flythrough implementation:

+++ visualization/nviz/scripts

(new) visualization/nviz/scripts/flythrough.tcl
	tcl part for togl_flythrough.c

(mod) visualization/nviz/scripts/panel_main.tcl
	"source" for flythrough.tcl and set UI for flythrough

(mod) visualization/nviz/scripts/panel_kanimator.tcl
	replaced get_focus with get_viewdir to work with flythrough


+++ visualization/nviz/src

(new) visualization/nviz/src/togl_flythrough.c
	all flythrough navigation
	Nset/Nget_viewdir commands
	override of command Ndraw_all (function draw_all
	in file draw.c) by function draw_all_together for drawing
		surf/vector/site in "fine" resolution
		all together with no flickering (no CLR
		between any of them)
	added semaphore "is_drawing" to avoid "clogging"
		between ordinary drawing and flythrough that
		try to draw continuously

(mod) visualization/nviz/src/quick_draw.c
	calls "flythrough_draw_cb()" after drawing, before returning
		in order to execute callbacks at the right moment
	functions that call "GS_alldraw_wire" do not execute
		"flythrough_draw_cb()"

(mod) visualization/nviz/src/nviz_init.c
	creates tcl commands and variables by calling
		togl_flythrough_init_tcl(interp, &data);
    		that also adds timer function by calling
				Togl_TimerFunc(togl_flythrough_timer_cb);
					that first time calls
						togl_flythrough_init(togl);

THIS IS THE Ninit FUNCTION WITH flythrough ADDITION
int Ninit(Tcl_Interp * interp, Tk_Window w)
{
    static Nv_data data;
    init_commands(interp, &data);
    Ninitdata(interp, &data);

/*** ACS_MODIFY flythrough  ONE LINE ******************************************/
	togl_flythrough_init_tcl(interp, &data);

    /* compile in the home directory */
    Tcl_SetVar(interp, "src_boot", getenv("GISBASE"), TCL_GLOBAL_ONLY);
    return(TCL_OK);
}

THIS IS THE END PART OF THE NUNCTION Nquick_draw_cmd WITH flythrough_postdraw_cb() ADDITION
{
	...
    GS_done_draw();
    G_free (surf_list);

/*** ACS_MODIFY flythrough  ONE LINE ******************************************/
	flythrough_postdraw_cb();

	return (TCL_OK);
}

WARNING: 	remember to add "togl_flythrough.o"
			into the visualization/nviz/src/Makefile

+++ visualization/nviz/bitmaps

(new) visualization/nviz/bitmaps/flythrough/.gif
	a_lr.gif  b_c.gif   b_lc.gif  b_lr.gif  vuota.gif
	a_ud.gif  b_cr.gif  b_l.gif   b_r.gif
		icons for flythrough help


+++ lib/ogsf

(mod) lib/ogsf/gk.c
	changed get/set_focus with get/set_viewdir for kanimator
		to work with flythrough
	corrected bug when adding point with disabled channels

(mod) lib/ogsf/GK2.c
	changed get/set_focus with get/set_viewdir for kanimator
		to work with flythrough

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