/* Functions: PS_area_plot
**
** Author: Radim Blazek Jan 2000
** modified copy of ps_vector.c by Paul W. Carlson March 1992
*/

#include "vector.h"
#include <grass/Vect.h>
#include "ps_info.h"
#include "local_proto.h"

/* constuct subpath with moveto and repeated lineto from Points */
int construct_path (struct line_pnts *Points, double shift, int t)  
{
    int i, np, k = 1;
    double *xarray, *yarray, x, y;

    np = Points->n_points;
    xarray = Points->x;
    yarray = Points->y;

    for (i = 0; i < np ; i++)
    {
        x = XCONV(xarray[0]+shift);   
        y = YCONV(yarray[0]);
        fprintf(PS.fp, "%.1f %.1f ", x, y);
	if ( i==0 && ( t == START_PATH || t == WHOLE_PATH) )
        {
	    fprintf(PS.fp, "M ");
	}
	else
	{
	    fprintf(PS.fp, "LN ");    
	}
        if (k == 2)
        {
	    fprintf(PS.fp, "\n");
	    k = 0;
	}
	else
	{
	    fprintf(PS.fp, " ");
	    k++;
	}
	xarray++;
	yarray++;
    }
    if ( t == CLOSE_PATH || t == WHOLE_PATH )
    {
	fprintf(PS.fp, "CP\n");
    }
    return 1;
}

/* create paths for area and islands */
static int plot_area (struct Map_info *P_map, int area, double shift)  
{
    struct line_pnts *Points;
    int  j, ret, ni, island;

    /* allocate memory for coordinates */
    Points = Vect_new_line_struct();

    /* plot areas */
    if (0 > (ret = Vect_get_area_points(P_map, area, Points))) {
	if (ret == -1) G_warning("Read error in vector file\n");
	return 0;
    }
    construct_path (Points, shift, WHOLE_PATH);

    /* plot islands */
    ni = Vect_get_area_num_isles (P_map, area);
    for (j=0; j < ni; j++) {
	island = Vect_get_area_isle (P_map, area, j);
	if (0 > (ret = Vect_get_isle_points(P_map, island, Points))) {
	    if (ret == -1) G_warning("Read error in vector file\n");
	    return -1;
	}
	    construct_path (Points, shift, WHOLE_PATH);
    }
    return 1; 
}

/* plot areas */
int PS_vareas_plot (struct Map_info *P_map, int vec)
{
    int  na, area, ret;
    double e, w, n, s, aw, shift; 
    double llx, lly, urx, ury, sc;
    char pat[50];
    struct line_cats *Cats;
    BOUND_BOX box;
    VARRAY *Varray = NULL;

    fprintf(PS.fp, "1 setlinejoin\n"); /* set line join to round */

    Cats = Vect_new_cats_struct ();
  
    /* Create vector array if required */
    if ( vector.layer[vec].cats != NULL || vector.layer[vec].where != NULL ) {
	Varray = Vect_new_varray ( Vect_get_num_areas(P_map) );
        if ( vector.layer[vec].cats != NULL ) {
	    ret = Vect_set_varray_from_cat_string (P_map, vector.layer[vec].field,
	                 vector.layer[vec].cats, GV_AREA, 1, Varray );
	} else {
	    ret = Vect_set_varray_from_db (P_map, vector.layer[vec].field,
	                 vector.layer[vec].where, GV_AREA, 1, Varray );
	}
	G_debug ( 3, "%d items selected for vector %d", ret, vec );
    }
    
    shift = 0;
    /* read and plot areas */
    na = Vect_get_num_areas(P_map); 
    for (area = 1; area <= na; area++) {
        if ( Varray != NULL && Varray->c[area] == 0 ) continue; /* is not in array */
	
	Vect_get_area_box (P_map, area, &box);
	n = box.N;
	s = box.S;
	e = box.E;
	w = box.W;
	if (PS.w.proj == PROJECTION_LL)
	{	
	    aw = G_adjust_easting(w, &PS.w);	    
	    if ( aw > PS.w.east ) aw -= 360.0; 
	    shift = aw - w;
	    e += shift;  
	    w += shift;
	}
	/* check if in window */
	if ( n < PS.w.south || s > PS.w.north || e < PS.w.west || w > PS.w.east )
	    continue;
	    
	fprintf(PS.fp, "NP\n");
	if (PS.w.proj == PROJECTION_LL)
	{	
	    /* plot area while in window */
	    while ( e > PS.w.west ) 
	    {
		ret = plot_area (P_map, area, shift);
		if ( ret != 1) 
		    return 0;
		shift -= 360.0;
		e -= 360.0; 
	    }
	}
	else
	{
	    ret = plot_area (P_map, area, shift);
	    if ( ret != 1) 
		return 0;
	}
	if ( vector.layer[vec].pat != NULL || !(color_none ( &vector.layer[vec].fcolor) ) ) {
	    if ( vector.layer[vec].pat != NULL ) { /* use pattern */
		sc = vector.layer[vec].scale;
		/* DEBUG */
		/*
		printf("\n eps pattern = %s\n", vector.layer[vec].eps);
		printf("       scale = %f\n", vector.layer[vec].scale);
		*/
		/* load pattern */
		eps_bbox( vector.layer[vec].pat , &llx, &lly, &urx, &ury);
		sprintf ( pat, "APATTEPS%d", vec);
		pat_save ( PS.fp, vector.layer[vec].pat, pat); 
		fprintf(PS.fp, "<<  /PatternType 1\n    /PaintType 1\n    /TilingType 1\n"); 
		fprintf(PS.fp, "    /BBox [%f %f %f %f]\n", llx * sc, lly * sc, urx * sc, ury * sc ); 
		fprintf(PS.fp, "    /XStep %f\n    /YStep %f\n", (urx - llx) * sc, (ury - lly) * sc);
		fprintf(PS.fp, "    /PaintProc\n      { begin\n");
		fprintf(PS.fp, "        %f %f scale\n", sc, sc);
		set_ps_color ( &(vector.layer[vec].fcolor) );
		fprintf(PS.fp, "        %.8f W\n", vector.layer[vec].pwidth );  
		fprintf(PS.fp, "        %s\n", pat);
		fprintf(PS.fp, "        end\n");
		fprintf(PS.fp, "      } bind\n>>\n");
		sprintf ( pat, "APATT%d", vec);
		fprintf(PS.fp, " matrix\n makepattern /%s exch def\n", pat);
		fprintf(PS.fp, "/Pattern setcolorspace\n %s setcolor\n", pat);
	    } else {
		set_ps_color ( &(vector.layer[vec].fcolor) );
	    }
	    
	    fprintf(PS.fp, "F\n");			
	}
	if ( vector.layer[vec].width > 0 && !(color_none ( &vector.layer[vec].color)) )
	{
	    fprintf(PS.fp, "%.8f W\n", vector.layer[vec].width );  
	    set_ps_color ( &(vector.layer[vec].color) );
	    fprintf(PS.fp, "stroke\n");
	}
    }
    fprintf(PS.fp, "\n");
    fprintf(PS.fp, "0 setlinejoin\n"); /* reset line join to miter */
    return 1;
}