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/****************************************************************************
*
* MODULE: Symbol library
*
* AUTHOR(S): Radim Blazek
*
* PURPOSE: Stroke symbol
*
* COPYRIGHT: (C) 2001 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
*****************************************************************************/
#include <stdlib.h>
#include <math.h>
#include "gis.h"
#include "symbol.h"
#define PI 3.14159265
void
add_coor ( SYMBCHAIN *chain, int x, int y)
{
G_debug ( 5, " add_coor %d, %d", x, y );
if ( chain->scount == chain->salloc ) {
chain->salloc += 10;
chain->sx = (int *) G_realloc ( chain->sx, chain->salloc * sizeof(int) );
chain->sy = (int *) G_realloc ( chain->sy, chain->salloc * sizeof(int) );
}
chain->sx[chain->scount] = x;
chain->sy[chain->scount] = y;
chain->scount++;
}
/* draw chain
* s - scale
* ch - chain number
*/
int
stroke_chain ( SYMBPART *part, int ch, double s )
{
int k, l, first;
SYMBEL *elem;
SYMBCHAIN *chain;
double r;
double a1, a2, da;
int x, y, x0, y0;
G_debug ( 5, " stroke_chain(): ch = %d", ch );
chain = part->chain[ch];
G_debug ( 5, " element count = %d", chain->count );
first = 1;
for ( k = 0; k < chain->count; k++ ) {
elem = chain->elem[k];
switch ( elem->type ) {
case S_LINE:
G_debug ( 5, " LINE count = %d", elem->coor.line.count );
for (l = 0; l < elem->coor.line.count; l++) {
add_coor ( chain, s * elem->coor.line.x[l], s * elem->coor.line.y[l] );
if ( first ) {
x0 = s * elem->coor.line.x[l];
y0 = s * elem->coor.line.y[l];
first = 0;
}
}
break;
case S_ARC:
da = 10 * PI / 180 ; /* later calc from size and tolerance */
r = elem->coor.arc.r;
G_debug ( 5, " ARC da = %f r = %f", da, r );
/* convert to positive angles */
a1 = PI * elem->coor.arc.a1 / 180;
if ( a1 < 0 ) a1 += 2 * PI;
a2 = PI * elem->coor.arc.a2 / 180;
if ( a2 < 0 ) a2 += 2 * PI;
if ( elem->coor.arc.clock ) { /* clockwise */
while (1) {
x = s * elem->coor.arc.x + s * r * cos(a1);
y = s * elem->coor.arc.y + s * r * sin(a1);
add_coor ( chain, x, y);
if ( first ) {
x0 = x;
y0 = y;
first = 0;
}
if ( a1 == a2 ) break;
a1 -= da;
if ( a1 < a2 ) a1 = a2;
}
} else {
while (1) {
x = s * elem->coor.arc.x + s * r * cos(a1);
y = s * elem->coor.arc.y + s * r * sin(a1);
add_coor ( chain, x, y);
if ( first ) {
x0 = x;
y0 = y;
first = 0;
}
if ( a1 == a2 ) break;
a1 += da;
if ( a1 > a2 ) a1 = a2;
}
}
break;
}
}
if ( part->type == S_POLYGON ) {
add_coor ( chain, x0, y0); /* Close ring */
}
return 0;
}
/*
* Stroke symbol to form used for Xdriver.
*
* rotation and tolerance currently not supported
*/
void
S_stroke ( SYMBOL *Symb, int size, double rotation, int tolerance )
{
int i, j;
double s;
SYMBPART *part;
G_debug ( 3, "S_stroke(): size = %d rotation = %f tolerance = %d", size, rotation, tolerance );
/* TODO: support for rotation and tolerance */
s = size * Symb->scale;
for ( i = 0; i < Symb->count; i++ ) {
G_debug ( 4, " part %d", i );
part = Symb->part[i];
switch ( part->type ) {
case S_POLYGON:
for ( j = 0; j < part->count; j++ ) { /* RINGS */
stroke_chain ( part, j, s);
}
break;
case S_STRING: /* string has 1 chain */
stroke_chain ( part, 0, s);
break;
}
}
}
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