graph_clse.c

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/*
 * Close down the graphics processing.  This gets called only at driver
 * termination time.
 */


#include <grass/gis.h>
#include "driverlib.h"
#include "htmlmap.h"

/* sreen dimensions defined in Graph_Set.c */

/* point in polygon test by Randolph Franklin */
/* http://www.ecse.rpi.edu/Homepages/wrf/     */
/* adapted for integer coordinates            */

static int pnpoly(int npol, int *xp, int *yp, int x, int y)
{
    int i, j, c = 0;

    for (i = 0, j = npol - 1; i < npol; j = i++) {
        if ((((yp[i] <= y) && (y < yp[j])) ||
             ((yp[j] <= y) && (y < yp[i]))) &&
            (x < (xp[j] - xp[i]) * (y - yp[i]) / (yp[j] - yp[i]) + xp[i]))
            c = !c;
    }
    return c;
}



void HTML_Graph_close(void)
{
    struct MapPoly *poly, *test_poly;

    int i;
    int inside;

    /* 
     * exmaine the list of polygons, if a polygon wholly exists inside of
     * another polygon, then remove it.
     *
     */

    for (poly = html.head; poly != NULL; poly = poly->next_poly) {

        for (test_poly = html.head; test_poly != NULL;
             test_poly = test_poly->next_poly) {
            if (poly == test_poly) {
                continue;       /* don't check ourselves */
            }

            inside = 1;
            for (i = 0; i < poly->num_pts && inside; i++) {
                inside = pnpoly(test_poly->num_pts,
                                test_poly->x_pts, test_poly->y_pts,
                                poly->x_pts[i], poly->y_pts[i]);
            }
            if (inside) {
                poly->num_pts = 0;      /* mark polygon as having no points */
                break;
            }
        }

    }


    /*
     * write any beginning prologue appropriate for the map type
     */

    switch (html.type) {

    case APACHE:
        fprintf(html.output, "#base _base_\n#default _default_\n");
        break;

    case RAW:
        break;

    case CLIENT:
        fprintf(html.output, "<MAP NAME=\"map\">\n");
        break;
    }

    /*
     * write the polygons in a specific format
     */

    for (poly = html.head; poly != NULL; poly = poly->next_poly) {
        if (poly->num_pts >= 3) {

            switch (html.type) {

            case APACHE:
                fprintf(html.output, "poly %s", poly->url);
                for (i = 0; i < poly->num_pts; i++) {
                    fprintf(html.output, " %d,%d", poly->x_pts[i], poly->y_pts[i]);
                }
                fprintf(html.output, " %d,%d", poly->x_pts[0], poly->y_pts[0]);
                fprintf(html.output, "\n");
                break;

            case RAW:
                fprintf(html.output, "%s", poly->url);
                for (i = 0; i < poly->num_pts; i++) {
                    fprintf(html.output, " %d %d", poly->x_pts[i], poly->y_pts[i]);
                }
                fprintf(html.output, " %d %d", poly->x_pts[0], poly->y_pts[0]);
                fprintf(html.output, "\n");
                break;

            case CLIENT:
                fprintf(html.output,
                        "<AREA SHAPE=\"POLY\"\n HREF=\"%s\"\n  ALT=\"%s\"\n  COORDS=\"",
                        poly->url, poly->url);
                for (i = 0; i < poly->num_pts; i++) {
                    if (i > 0)
                        fprintf(html.output, ", ");
                    /* 
                     * don't add newlines, which confuses the weak-minded
                     * i.e., ms internet exploder :-(
                     * was: if (i % 8 == 0 && i != 0) fprintf(html.output,"\n  ");
                     */
                    fprintf(html.output, "%d,%d", poly->x_pts[i], poly->y_pts[i]);
                }
                fprintf(html.output, ", %d,%d", poly->x_pts[0], poly->y_pts[0]);
                fprintf(html.output, "\">\n");
                break;

            }

        }

    }

    /* final stuff, if needed */

    switch (html.type) {

    case APACHE:
        break;

    case RAW:
        break;

    case CLIENT:
        fprintf(html.output,
                "<AREA SHAPE=\"RECT\" NOHREF COORDS=\"%d,%d %d,%d\">\n",
                0, 0, screen_width, screen_height);
        fprintf(html.output, "</MAP>\n");
        break;

    }

    /*
     * close file 
     */

    fclose(html.output);
}