Geografic-Information-System/lib/htmldriver/Graph_Set.c

/*
 * Start up graphics processing.  Anything that needs to be assigned, set up,
 * started-up, or otherwise initialized happens here.  This is called only at
 * the startup of the graphics driver.
 *
 * The external variables define the pixle limits of the graphics surface.  The
 * coordinate system used by the applications programs has the (0,0) origin
 * in the upper left-hand corner.  Hence,
 *    screen_left < screen_right
 *    screen_top  < screen_bottom 
 *
 */

#include <string.h>
#include <stdlib.h>

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

char *last_text;
int last_text_len;
char *file_name;
int html_type;
FILE *output;

struct MapPoly *head;
struct MapPoly **tail;

int BBOX_MINIMUM;
int MAX_POINTS;
int MINIMUM_DIST;

int HTML_Graph_set(void)
{
    char *p;

    G_gisinit("HTMLMAP driver");

    NCOLORS = 256;

    /*
     * set the minimum bounding box dimensions 
     */

    if (NULL != (p = getenv("GRASS_HTMLMINBBOX"))) {
	BBOX_MINIMUM = atoi(p);
	if (BBOX_MINIMUM <= 0) {
	    BBOX_MINIMUM = DEF_MINBBOX;
	}
    }
    else {
	BBOX_MINIMUM = DEF_MINBBOX;
    }

    /*
     * set the maximum number of points
     */

    if (NULL != (p = getenv("GRASS_HTMLMAXPOINTS"))) {
	MAX_POINTS = atoi(p);
	if (MAX_POINTS <= 0) {
	    MAX_POINTS = DEF_MAXPTS;
	}
    }
    else {
	MAX_POINTS = DEF_MAXPTS;
    }

    /*
     * set the minimum difference to keep a point
     */

    if (NULL != (p = getenv("GRASS_HTMLMINDIST"))) {
	MINIMUM_DIST = atoi(p);
	if (MINIMUM_DIST <= 0) {
	    MINIMUM_DIST = DEF_MINDIST;
	}
    }
    else {
	MINIMUM_DIST = DEF_MINDIST;
    }


    /*
     * open the output file
     */

    if (NULL != (p = getenv("GRASS_HTMLFILE"))) {
	if (strlen(p) == 0) {
	    p = FILE_NAME;
	}
    }
    else {
	p = FILE_NAME;
    }
    file_name = p;

    output = fopen(file_name, "w");
    if (output == NULL) {
	G_fatal_error("HTMLMAP: couldn't open output file %s", file_name);
	exit(EXIT_FAILURE);
    }


    G_message("HTMLMAP: collecting to file: %s\n width = %d, height = %d, ",
	      file_name, screen_right, screen_bottom);

    /*
     * check type of map wanted
     */

    if (NULL == (p = getenv("GRASS_HTMLTYPE"))) {
	p = "CLIENT";
    }

    if (strcmp(p, "APACHE") == 0) {
	html_type = APACHE;
	fprintf(stdout, "type = APACHE\n");

    }
    else if (strcmp(p, "RAW") == 0) {
	html_type = RAW;
	fprintf(stdout, "type = RAW\n");

    }
    else {
	html_type = CLIENT;
	fprintf(stdout, "type = CLIENT\n");
    }


    /*
     * initialize text memory and list pointers
     */

    last_text = (char *)G_malloc(INITIAL_TEXT + 1);
    last_text[0] = '\0';
    last_text_len = INITIAL_TEXT;

    head = NULL;
    tail = &head;

    return 0;
}