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/* $Id: display.c,v 1.9 2004/02/09 03:51:04 hamish Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include "gis.h"
#include "Vect.h"
#include "raster.h"
#include "display.h"
#include "D.h"
#include "colors.h"
#include "global.h"
#include "proto.h"
/* --- DISLAY ---
* For all display functions the display driver must be opened first.
* Because some functions like erase() call other grass commands, driver is closed
* and reopened within these functions
*/
/* Display points */
void display_points ( struct line_pnts *Points, int flsh )
{
int i;
G_debug (2, "display_points()");
for(i=1; i < Points->n_points; i++) {
G_plot_line ( Points->x[i-1], Points->y[i-1], Points->x[i], Points->y[i]);
}
if ( flsh ) R_flush();
}
/* Display icon */
void display_icon ( double x, double y, int icon, double angle, int size , int flsh )
{
G_debug (2, "display_icon()");
G_plot_icon(x, y, icon, angle, Scale * size);
if ( flsh ) R_flush();
}
/* Display vector line
* color : code from SymbNumber
*
* ! This function doesn't check Symb[symb].on so that new digitized line is displayed even
* if its symbology is switched off (that means incorrect and user friendly)
*/
void display_line ( int line, int color, int flsh )
{
int type, symb;
static struct line_pnts *Points;
static struct line_cats *Cats;
static int first = 1;
G_debug (2, "display_line(): line = %d color = %d", line, color );
if ( first ) {
Points = Vect_new_line_struct ();
Cats = Vect_new_cats_struct ();
first = 0;
}
if ( !Vect_line_alive ( &Map, line ) ) return;
type = Vect_read_line ( &Map, Points, Cats, line);
if ( color == SYMB_DEFAULT ) symb = LineSymb[line];
else symb = color;
symb_set_driver_color ( symb );
if ( type & GV_POINTS ) display_icon ( Points->x[0], Points->y[0], G_ICON_CROSS, 0, 6, flsh);
else display_points ( Points, flsh );
}
/* Redraw updated lines */
void
display_updated_lines ( int symb )
{
int i, line;
for ( i = 0; i < Vect_get_num_updated_lines(&Map); i++ ) {
line = Vect_get_updated_line( &Map, i );
if ( !Vect_line_alive ( &Map, line ) ) continue;
display_line ( line, symb, 0 );
}
R_flush();
}
/* Display node, color may be given but shape and size is read from symbology table,
* this is useful to delete (redraw by background) existing node
*
* color : code from SymbNumber
*/
void display_node ( int node, int color, int flsh )
{
int symb;
double x, y;
G_debug (2, "display_node(): node = %d color = %d", node, color );
if ( !Vect_node_alive ( &Map, node ) ) return;
if ( color == SYMB_DEFAULT ) symb = NodeSymb[node];
else symb = color;
symb_set_driver_color ( symb );
Vect_get_node_coor ( &Map, node, &x, &y, NULL);
display_icon ( x, y, G_ICON_CROSS, 0.785, 6, flsh);
}
/* Redraw updated nodes */
void
display_updated_nodes ( int symb )
{
int i, node;
if ( symb != SYMB_DEFAULT ) symb_set_driver_color ( symb );
for ( i = 0; i < Vect_get_num_updated_nodes(&Map); i++ ) {
node = Vect_get_updated_node( &Map, i );
if ( !Vect_node_alive ( &Map, node ) ) continue;
if ( NodeSymb[node] == SYMB_NODE_0 ) continue;
display_node ( node, symb, 0);
}
R_flush();
}
/* Display vector map */
void display_map ( void )
{
int i, n, symb;
G_debug (2, "display_map()");
/* Because after resize of monitor we expect manual call to display_map()
* it is good to refresh D_* here */
driver_refresh ();
/* Lines */
n = Vect_get_num_lines ( &Map );
symb_set_driver_color ( SYMB_HIGHLIGHT );
for(i=1; i <= n; i++) {
symb = LineSymb[i];
G_debug (2, "symb = %d", symb);
if ( !Symb[symb].on ) continue;
display_line ( i , SYMB_DEFAULT, 0 );
}
R_flush();
/* Nodes: first nodes with more than 1 line, then nodes with only 1 line,
* so that dangles are not hidden, and nodes without lines (points,
* centroids, are displayed) */
n = Vect_get_num_nodes ( &Map );
if ( Symb[SYMB_NODE_2].on ) {
symb_set_driver_color ( SYMB_NODE_2 );
for(i=1; i <= n; i++) {
if ( !Vect_node_alive ( &Map, i) ) continue;
if ( NodeSymb[i] != SYMB_NODE_2 ) continue;
display_node(i, NodeSymb[i], 0);
}
R_flush();
}
if ( Symb[SYMB_NODE_1].on ) {
symb_set_driver_color ( SYMB_NODE_1 );
for(i=1; i <= n; i++) {
G_debug ( 2, "node = %d NodeSymb = %d", i, NodeSymb[i]);
if ( !Vect_node_alive ( &Map, i) ) continue;
if ( NodeSymb[i] != SYMB_NODE_1 ) continue;
display_node(i, NodeSymb[i], 0);
}
R_flush();
}
}
/* Display bacground */
void display_bg ( void )
{
int i;
G_debug (2, "display_bg()");
driver_close();
for(i=0; i < nbgcmd; i++) {
if ( Bgcmd[i].on )
system ( Bgcmd[i].cmd );
}
driver_open();
}
/* Erase */
void display_erase ( void )
{
char command[128];
driver_close();
sprintf(command, "d.erase color=white");
system( command ); /* It does everything and command is registered */
driver_open();
/* As erase must be run after each zoom by v.digit, here is good place to reset plot.
* Other such place is display_map() */
driver_refresh ();
}
/* Redraw */
void display_redraw ( void )
{
display_erase ();
display_bg();
display_map();
}
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