#include <stdio.h>
#include <math.h>
#include <float.h>
#include <grass/gis.h>
#include <grass/Vect.h>
#include <grass/display.h>
#include "sw_defs.h"
#include "defs.h"
#include "write.h"

int 
write_ep (struct Edge *e )
{
    static struct line_pnts *Points = NULL;
    static struct line_cats *Cats = NULL;

    if ( !Points ) {
	Points = Vect_new_line_struct ();
	Cats = Vect_new_cats_struct ();
    }
    
    if(!triangulate)
    {	
	double x1, y1, x2, y2;
	
	if ( e->ep[le] != NULL && e->ep[re] != NULL ) { /* both end defined */
	    x1 = e->ep[le]->coord.x;
	    y1 = e->ep[le]->coord.y;
	    x2 = e->ep[re]->coord.x;
	    y2 = e->ep[re]->coord.y;

	    if( !Vect_point_in_box(x1,y1,0.0,&Box) || !Vect_point_in_box(x2,y2,0.0,&Box) ) {
		Vect_box_clip(&x1, &y1, &x2, &y2, &Box);
	    }

	    /* Don't write zero length */
	    if ( x1 == x2 && y1 == y2 ) return 0;
	    
	    Vect_reset_line ( Points );
	    Vect_append_point ( Points, x1, y1, 0.0 );
	    Vect_append_point ( Points, x2, y2, 0.0 );
	    Vect_write_line ( &Out, Type, Points, Cats );
	} else {
	    int  knownPointAtLeft;

	    if ( e->ep[le] != NULL ) {
	        x1 = e->ep[le]->coord.x;
	        y1 = e->ep[le]->coord.y;
		knownPointAtLeft = 1;
	    } else {
	        x1 = e->ep[re]->coord.x;
	        y1 = e->ep[re]->coord.y;
		knownPointAtLeft = 0;
	    }
	    
            if( extend_line (Box.S, Box.N, Box.W, Box.E,
                             e->a, e->b, e->c, x1, y1, &x2, &y2,
			     knownPointAtLeft)
	    ) { 
		/* Don't write zero length */
		if ( x1 == x2 && y1 == y2 ) return 0;

		Vect_reset_line ( Points );
		Vect_append_point ( Points, x1, y1, 0.0 );
		Vect_append_point ( Points, x2, y2, 0.0 );
		Vect_write_line ( &Out, Type, Points, Cats );
	    }
	}
    }

    return 0;
}