gsd_label.c

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#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/gstypes.h>

#include "rgbpack.h"

#define MAX_LIST 20

static int first = 0;
GLuint label_base;
GLuint label_id;

void gs_put_label(const char *text, GLuint fontbase, int size,
                  unsigned long color, int *pt)
{
    int txt_width;
    GLint tmp[4];
    float labpt[2];
    int t, l, b, r;

    if (!first) {
        /* initialize display list */
        label_base = glGenLists(MAX_LIST);
        glListBase(label_base);
        label_id = label_base;
        first = 1;
    }

    if (label_id > (label_base + MAX_LIST)) {
        G_warning(_("Max. number of labels reached!"));
        return;
    }

    glNewList(label_id, GL_COMPILE_AND_EXECUTE);
    txt_width = gsd_get_txtwidth(text, size);

    /* adjust to center text string */
    labpt[X] = (float)(pt[X] - txt_width / 2.);
    labpt[Y] = (float)pt[Y];

    glGetIntegerv(GL_VIEWPORT, tmp);
    l = tmp[0];
    r = tmp[0] + tmp[2];
    b = tmp[1];
    t = tmp[1] + tmp[3];

    gsd_bgn_legend_viewport(l, b, r, t);


    /* Set text color */
    gsd_color_func(color);

    do_label_display(fontbase, labpt, text);


    gsd_end_legend_viewport();

    glEndList();

    label_id++;

    return;
}


void gsd_remove_curr(void)
{
    if (label_id) {
        glDeleteLists(label_id - 1, 1);
        label_id--;
    }

    return;
}


void gsd_remove_all(void)
{
    glDeleteLists(label_base, MAX_LIST);
    label_id = label_base;

    return;
}

void gsd_call_label(void)
{
    int i;

    for (i = 0; i < MAX_LIST; i++) {
        glCallList(i + label_base);
        glFlush();
    }
    return;
}