Geografic-Information-System/ps/ps.map/do_labels.c

/* Function: do_labels
 **
 ** This function is a much modified version of the p.map function of
 ** the same name.
 **
 ** Author: Paul W. Carlson     March 1992
 */

#include <stdlib.h>
#include <string.h>
#include <grass/colors.h>
#include <grass/raster.h>
#include <grass/glocale.h>
#include "clr.h"
#include "labels.h"
#include "local_proto.h"

#define FIELD(x) strcmp(x,field)==0
#define LEFT 0
#define RIGHT 1
#define LOWER 0
#define UPPER 1
#define CENTER 2

int do_labels(int other)
{
    FILE *fd;

    int i;
    int font_override = 0;

    if (!labels.count && labels.other == NULL)
	return 0;

    /* default is Helvetica font */
    set_font_name("Helvetica");

    if (!other) {
	for (i = 0; i < labels.count; i++) {
	    fd = G_fopen_old("paint/labels", labels.name[i],
			     labels.mapset[i]);

	    if (fd == NULL) {
		G_warning(_("Can't open label file <%s> in mapset <%s>"),
			  labels.name[i], labels.mapset[i]);
	    }
	    else {
		G_message(_("Reading labels file <%s in %s> ..."),
			  labels.name[i], labels.mapset[i]);

		if (labels.font[i] != NULL) {
		    set_font_name(labels.font[i]);
		    font_override = 1;
		}
		set_font_size(10);
		do_label(fd, font_override);
		fclose(fd);
		font_override = 0;
	    }
	}
    }

    if (other && labels.other) {
	fd = fopen(labels.other, "r");
	if (fd == NULL)
	    G_warning(_("Can't open temporary label file <%s>"),
		      labels.other);
	else {
	    G_message(_("Reading text file ..."));

	    do_label(fd, font_override);
	    fclose(fd);
	}
    }

    return 0;
}

int do_label(FILE * fd, int font_override)
{
    double east, north, dtmp, x, y;
    float size, rotate, margin;
    int xoffset, yoffset, xref, yref;
    PSCOLOR background, border, color, hcolor;
    int r, g, b;
    int ret;
    double width, hwidth;
    int opaque, fontsize, multi_text, x_int, y_int;
    int itmp;
    char field[1024];
    char value[1024];
    char ch, buf[1024];
    double atof();
    int X_just_offset, Y_just_offset;

    /* initialize */
    north = PS.w.north;
    east = PS.w.west;
    opaque = 0;
    xoffset = 0;
    yoffset = 0;
    width = 1.;
    set_color(&color, 0, 0, 0);	/* black */
    set_color(&background, 255, 255, 255);	/* white */
    set_color(&border, 0, 0, 0);	/* black */
    unset_color(&hcolor);
    hwidth = 0.;
    xref = CENTER;
    yref = CENTER;
    rotate = 0., size = 0.;
    fontsize = 0;
    X_just_offset = Y_just_offset = 0;

    /* read the labels file */
    while (fgets(buf, sizeof buf, fd)) {
	*value = 0;
	*field = 0;
	if (sscanf(buf, "%[^:]:%[^\n]", field, value) < 1)
	    continue;

	if (FIELD("text")) {	/* appears last in the labels file */
	    G_strip(value);

	    /* get reference coordinates */
	    /*
	       x = XCONV(east);
	       y = YCONV(north);
	     */
	    G_plot_where_xy(east, north, &x_int, &y_int);

	    /* justification based padding */
	    if (xref == LEFT)
		X_just_offset = 35;
	    if (xref == RIGHT)
		X_just_offset = -35;
	    if (xref == CENTER)
		X_just_offset = 0;
	    if (yref == UPPER)
		Y_just_offset = 35;
	    if (yref == LOWER)
		Y_just_offset = -35;
	    if (yref == CENTER)
		Y_just_offset = 0;

	    /* adjust padding for given rotation */
	    if (rotate != 0.0)
		G_rotate_around_point_int(0, 0, &X_just_offset,
					  &Y_just_offset, -1 * rotate);

	    /* apply padding */
	    x_int += X_just_offset;
	    y_int -= Y_just_offset;

	    x = (double)x_int / 10.;
	    y = (double)y_int / 10.;

	    x += xoffset;
	    y += yoffset;

	    /* set font size if given in map units and not given by fontsize */
	    if (fontsize && size > 0)
		G_warning(_("Text labels: 'fontsize' given so ignoring 'size'"));

	    if (!fontsize)
		fontsize = size * PS.ns_to_y;

	    /* fall back if no size of any kind is defined */
	    if (fontsize == 0)
		fontsize = 10;

	    /*
	       if (fontsize < 10) fontsize = 10;
	       if (fontsize > 50) fontsize = 50;
	     */
	    set_font_size(fontsize);

	    /* set margin to 20% of font size */
	    if (opaque || !color_none(&border)) {
		margin = 0.2 * (double)fontsize + 0.5;
		/*if (margin < 2) margin = 2; *//* commented because
		   too big box was created for little font; RB March 2000 */
		if (!color_none(&hcolor))
		    margin += hwidth;
	    }
	    else
		margin = 0;
	    fprintf(PS.fp, "/mg %.2f def\n", margin);

	    /* construct path for box */
	    multi_text = multi_lines(value);
	    if (multi_text) {
		/* multiple lines - text is in PostScript array "ta" */
		multi_text_box_path(x, y, xref, yref, value, fontsize, 
		                    rotate);
	    }
	    else {
		/* single line - text is left on stack */
		text_box_path(x, y, xref, yref, value, rotate);
	    }

	    if (opaque && !color_none(&background)) {
		/* fill the box */
		set_ps_color(&background);
		fprintf(PS.fp, "F ");
		opaque = 0;
	    }

	    if (!color_none(&border)) {
		/* draw the border */
		set_line_width(width);	/* added by RB, ? add bwidth option */
		set_ps_color(&border);
		fprintf(PS.fp, "D ");
		unset_color(&border);
	    }

	    /* draw the text */
	    if (!color_none(&hcolor)) {
		set_ps_color(&hcolor);
		set_line_width(width + 2 * hwidth);
		if (multi_text)
		    fprintf(PS.fp, "DMH ");
		else
		    fprintf(PS.fp, "HC ");
	    }
	    set_ps_color(&color);
	    if (multi_text)
		fprintf(PS.fp, "DMT ");
	    else
		fprintf(PS.fp, "TIB ");

	    /* done; clear the decks for the next round */
	    unset_color(&hcolor);
	    hwidth = 0.;
	    width = 1.;
	    fontsize = 0;
	    rotate = 0.;

	    continue;
	}

	if (FIELD("color")) {
	    ret = G_str_to_color(value, &r, &g, &b);
	    if (ret == 1)
		set_color(&color, r, g, b);
	    else
		set_color(&color, 0, 0, 0);	/* black */

	    continue;
	}

	if (FIELD("hcolor")) {
	    ret = G_str_to_color(value, &r, &g, &b);
	    if (ret == 1)
		set_color(&hcolor, r, g, b);
	    else if (ret == 2)
		unset_color(&hcolor);

	    continue;
	}

	if (FIELD("xoffset")) {
	    xoffset = atoi(value);
	    continue;
	}

	if (FIELD("yoffset")) {
	    yoffset = atoi(value);
	    continue;
	}

	if (FIELD("ref")) {
	    if (!scan_ref(value, &xref, &yref)) {
		yref = CENTER;
		xref = CENTER;
	    }
	    continue;
	}

	if (FIELD("background")) {
	    /*
	       if(strncmp(value, "none", 4)==0) opaque = 0;
	     */
	    ret = G_str_to_color(value, &r, &g, &b);
	    if (ret == 1)
		set_color(&background, r, g, b);
	    else if (ret == 2)
		unset_color(&background);

	    continue;
	}

	if (FIELD("border")) {
	    ret = G_str_to_color(value, &r, &g, &b);
	    if (ret == 1)
		set_color(&border, r, g, b);
	    else if (ret == 2)
		unset_color(&border);

	    continue;
	}

	if (FIELD("opaque")) {
	    G_strip(value);
	    opaque = (strcmp(value, "no") != 0);
	    continue;
	}

	if (FIELD("width")) {
	    ch = ' ';
	    sscanf(value, "%lf%c", &width, &ch);
	    if (ch == 'i')
		width = width * 72.0;
	    if (width < 0.)
		width = 1.;
	    if (width > 25.)
		width = 25.;
	    continue;
	}

	if (FIELD("hwidth")) {
	    ch = ' ';
	    sscanf(value, "%lf%c", &hwidth, &ch);
	    if (ch == 'i')
		hwidth = hwidth * 72.0;
	    if (hwidth < 0.)
		hwidth = 0.;
	    if (hwidth > 5.)
		hwidth = 5.;
	    continue;
	}

	if (FIELD("size")) {
	    if (scan_resolution(value, &dtmp))
		size = dtmp;
	    continue;
	}

	if (FIELD("fontsize")) {
	    if (sscanf(value, "%d", &itmp) == 1 && itmp > 0)
		fontsize = itmp;
	    continue;
	}

	if (FIELD("north")) {
	    if (scan_northing(value, &dtmp))
		north = dtmp;
	    continue;
	}

	if (FIELD("east")) {
	    if (scan_easting(value, &dtmp))
		east = dtmp;
	    continue;
	}

	if (FIELD("font")) {
	    G_strip(value);
	    if (!font_override)
		set_font_name(value);
	    continue;
	}

	if (FIELD("rotate")) {
	    if (scan_northing(value, &dtmp))
		rotate = dtmp;
	    continue;
	}

    }
    /*fclose (fd); *//* commented because fd is closed after 
       do_label call; RB March 2000 */
    return 0;
}