gv3.c

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/*!
   \file lib/ogsf/gv3.c
 
   \brief OGSF library - loading vector sets (lower level functions)
 
   GRASS OpenGL gsurf OGSF Library
 
   (C) 1999-2008, 2011 by the GRASS Development Team
 
   This program is free software under the GNU General Public License
   (>=v2). Read the file COPYING that comes with GRASS for details.
 
   \author Bill Brown USACERL (December 1993)
   \author Updated by Martin Landa <landa.martin gmail.com>
   (doxygenized in May 2008, thematic mapping in August 2011)
 */
 
#include <stdlib.h>
 
#include <grass/gis.h>
#include <grass/colors.h>
#include <grass/raster.h>
#include <grass/vector.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
#include <grass/ogsf.h>
 
/*
   #define TRAK_MEM
 */
 
#ifdef TRAK_MEM
static int Tot_mem = 0;
#endif
 
/*!
   \brief Load vector map to memory
 
   The other alternative may be to load to a tmp file
 
   \param grassname vector map name
   \param[out] nlines number of loaded features
 
   \return pointer to geoline struct
   \return NULL on failure
 */
geoline *Gv_load_vect(const char *grassname, int *nlines)
{
    struct Map_info map;
    struct line_pnts *points;
    struct line_cats *Cats = NULL;
    geoline *top, *gln, *prev;
    int np, i, n, nareas, nl = 0, area, type, is3d;
    struct Cell_head wind;
    float vect[2][3];
    const char *mapset;
 
    mapset = G_find_vector2(grassname, "");
    if (!mapset) {
        G_warning(_("Vector map <%s> not found"), grassname);
        return NULL;
    }
 
    Vect_set_open_level(2);
    if (Vect_open_old(&map, grassname, "") == -1) {
        G_warning(_("Unable to open vector map <%s>"),
                  G_fully_qualified_name(grassname, mapset));
        return NULL;
    }
 
    top = gln = (geoline *)G_malloc(sizeof(geoline)); /* G_fatal_error */
    if (!top) {
        return NULL;
    }
 
    prev = top;
 
#ifdef TRAK_MEM
    Tot_mem += sizeof(geoline);
#endif
 
    points = Vect_new_line_struct();
    Cats = Vect_new_cats_struct();
 
    G_get_set_window(&wind);
    Vect_set_constraint_region(&map, wind.north, wind.south, wind.east,
                               wind.west, PORT_DOUBLE_MAX, -PORT_DOUBLE_MAX);
 
    is3d = Vect_is_3d(&map);
 
    /* Read areas */
    n = Vect_get_num_areas(&map);
    nareas = 0;
    G_debug(3, "Reading vector areas (nareas = %d)", n);
    for (area = 1; area <= n; area++) {
        G_debug(3, " area %d", area);
        Vect_get_area_points(&map, area, points);
        if (points->n_points < 3)
            continue;
 
        /* initialize style */
        gln->highlighted = 0;
 
        gln->type = OGSF_POLYGON;
        gln->npts = np = points->n_points;
        G_debug(3, "  np = %d", np);
 
        if (is3d) {
            gln->dims = 3;
            gln->p3 =
                (Point3 *)G_calloc(np, sizeof(Point3)); /* G_fatal_error */
            if (!gln->p3) {
                return (NULL);
            }
#ifdef TRAK_MEM
            Tot_mem += (np * sizeof(Point3));
#endif
        }
        else {
            gln->dims = 2;
            gln->p2 =
                (Point2 *)G_calloc(np, sizeof(Point2)); /* G_fatal_error */
            if (!gln->p2) {
                return (NULL);
            }
#ifdef TRAK_MEM
            Tot_mem += (np * sizeof(Point2));
#endif
        }
 
        for (i = 0; i < np; i++) {
            if (is3d) {
                gln->p3[i][X] = points->x[i];
                gln->p3[i][Y] = points->y[i];
                gln->p3[i][Z] = points->z[i];
            }
            else {
                gln->p2[i][X] = points->x[i];
                gln->p2[i][Y] = points->y[i];
            }
        }
        /* Calc normal (should be average) */
        if (is3d) {
            vect[0][X] = (float)(gln->p3[0][X] - gln->p3[1][X]);
            vect[0][Y] = (float)(gln->p3[0][Y] - gln->p3[1][Y]);
            vect[0][Z] = (float)(gln->p3[0][Z] - gln->p3[1][Z]);
            vect[1][X] = (float)(gln->p3[2][X] - gln->p3[1][X]);
            vect[1][Y] = (float)(gln->p3[2][Y] - gln->p3[1][Y]);
            vect[1][Z] = (float)(gln->p3[2][Z] - gln->p3[1][Z]);
            GS_v3cross(vect[1], vect[0], gln->norm);
        }
 
        gln->cats = NULL;
        gln->next = (geoline *)G_malloc(sizeof(geoline)); /* G_fatal_error */
        if (!gln->next) {
            return (NULL);
        }
 
#ifdef TRAK_MEM
        Tot_mem += sizeof(geoline);
#endif
 
        prev = gln;
        gln = gln->next;
        nareas++;
    }
    G_debug(3, "%d areas loaded", nareas);
 
    /* Read all lines */
    G_debug(3, "Reading vector lines ...");
    while (-1 < (type = Vect_read_next_line(&map, points, Cats))) {
        G_debug(3, "line type = %d", type);
        if (type & (GV_LINES | GV_FACE)) {
            if (type & (GV_LINES)) {
                gln->type = OGSF_LINE;
            }
            else {
                gln->type = OGSF_POLYGON;
                /* Vect_append_point ( points, points->x[0], points->y[0],
                 * points->z[0] ); */
            }
 
            /* initialize style */
            gln->highlighted = 0;
 
            gln->npts = np = points->n_points;
            G_debug(3, "  np = %d", np);
 
            if (is3d) {
                gln->dims = 3;
                gln->p3 =
                    (Point3 *)G_calloc(np, sizeof(Point3)); /* G_fatal_error */
                if (!gln->p3) {
                    return (NULL);
                }
#ifdef TRAK_MEM
                Tot_mem += (np * sizeof(Point3));
#endif
            }
            else {
                gln->dims = 2;
                gln->p2 =
                    (Point2 *)G_calloc(np, sizeof(Point2)); /* G_fatal_error */
                if (!gln->p2) {
                    return (NULL);
                }
#ifdef TRAK_MEM
                Tot_mem += (np * sizeof(Point2));
#endif
            }
 
            for (i = 0; i < np; i++) {
                if (is3d) {
                    gln->p3[i][X] = points->x[i];
                    gln->p3[i][Y] = points->y[i];
                    gln->p3[i][Z] = points->z[i];
                }
                else {
                    gln->p2[i][X] = points->x[i];
                    gln->p2[i][Y] = points->y[i];
                }
            }
            /* Calc normal (should be average) */
            if (is3d && gln->type == OGSF_POLYGON) {
                vect[0][X] = (float)(gln->p3[0][X] - gln->p3[1][X]);
                vect[0][Y] = (float)(gln->p3[0][Y] - gln->p3[1][Y]);
                vect[0][Z] = (float)(gln->p3[0][Z] - gln->p3[1][Z]);
                vect[1][X] = (float)(gln->p3[2][X] - gln->p3[1][X]);
                vect[1][Y] = (float)(gln->p3[2][Y] - gln->p3[1][Y]);
                vect[1][Z] = (float)(gln->p3[2][Z] - gln->p3[1][Z]);
                GS_v3cross(vect[1], vect[0], gln->norm);
                G_debug(3, "norm %f %f %f", gln->norm[0], gln->norm[1],
                        gln->norm[2]);
            }
 
            /* Store category info for thematic display */
            if (Cats->n_cats > 0) {
                gln->cats = Cats;
                Cats = Vect_new_cats_struct();
            }
            else {
                gln->cats = NULL;
                Vect_reset_cats(Cats);
            }
 
            gln->next =
                (geoline *)G_malloc(sizeof(geoline)); /* G_fatal_error */
            if (!gln->next) {
                return (NULL);
            }
#ifdef TRAK_MEM
            Tot_mem += sizeof(geoline);
#endif
 
            prev = gln;
            gln = gln->next;
            nl++;
        }
    }
    G_debug(3, "%d lines loaded", nl);
 
    nl += nareas;
 
    prev->next = NULL;
    G_free(gln);
 
#ifdef TRAK_MEM
    Tot_mem -= sizeof(geoline);
#endif
 
    Vect_close(&map);
 
    if (!nl) {
        G_warning(
            _("No features from vector map <%s> fall within current region"),
            G_fully_qualified_name(grassname, mapset));
        return (NULL);
    }
    else {
        G_message(_("Vector map <%s> loaded (%d features)"),
                  G_fully_qualified_name(grassname, mapset), nl);
    }
 
    *nlines = nl;
 
#ifdef TRAK_MEM
    G_debug(3, "Total vect memory = %d Kbytes", Tot_mem / 1000);
#endif
 
    return (top);
}
 
/*!
   \brief Tracking memory
 
   \param minus mimus number
 */
void sub_Vectmem(int minus)
{
    G_debug(5, "sub_Vectmem(): minus=%d", minus);
#ifdef TRAK_MEM
    {
        Tot_mem -= minus;
    }
#endif
 
    return;
}
 
/*!
   \brief Load styles for geolines based on thematic mapping
 
   \param gv pointer to geovect structure
   \param colors pointer to Colors structure or NULL
 
   \return number of features defined by thematic mapping
   \return -1 on error
 */
int Gv_load_vect_thematic(geovect *gv, struct Colors *colors)
{
    geoline *gvt;
 
    struct Map_info Map;
    struct field_info *Fi;
 
    int nvals, cat, nlines, nskipped;
    int red, blu, grn;
    const char *str;
    const char *mapset;
 
    dbDriver *driver;
    dbValue value;
 
    if (!gv || !gv->tstyle || !gv->filename)
        return -1;
 
    mapset = G_find_vector2(gv->filename, "");
    if (!mapset) {
        G_fatal_error(_("Vector map <%s> not found"), gv->filename);
    }
 
    Vect_set_open_level(1);
    if (Vect_open_old(&Map, gv->filename, "") == -1) {
        G_fatal_error(_("Unable to open vector map <%s>"),
                      G_fully_qualified_name(gv->filename, mapset));
    }
 
    Fi = Vect_get_field(&Map, gv->tstyle->layer);
    if (!Fi) {
        G_warning(_("Database connection not defined for layer %d"),
                  gv->tstyle->layer);
    }
    else {
        driver = db_start_driver_open_database(Fi->driver, Fi->database);
        if (!driver)
            G_fatal_error(_("Unable to open database <%s> by driver <%s>"),
                          Fi->database, Fi->driver);
    }
    G_message(_("Loading thematic vector layer <%s>..."),
              G_fully_qualified_name(gv->filename, mapset));
    nlines = nskipped = 0;
    for (gvt = gv->lines; gvt; gvt = gvt->next) {
        gvt->style = (gvstyle *)G_malloc(sizeof(gvstyle));
        G_zero(gvt->style, sizeof(gvstyle));
 
        /* use default style */
        gvt->style->color = gv->style->color;
        gvt->style->symbol = gv->style->symbol;
        gvt->style->size = gv->style->size;
        gvt->style->width = gv->style->width;
 
        cat = -1;
        if (gvt->cats)
            Vect_cat_get(gvt->cats, gv->tstyle->layer, &cat);
        if (cat < 0) {
            nskipped++;
            continue;
        }
 
        /* color */
        if (colors) {
            if (!Rast_get_c_color((const CELL *)&cat, &red, &grn, &blu,
                                  colors)) {
                G_warning(_("No color rule defined for category %d"), cat);
                gvt->style->color = gv->style->color;
            }
            gvt->style->color = (red & RED_MASK) +
                                ((int)((grn) << 8) & GRN_MASK) +
                                ((int)((blu) << 16) & BLU_MASK);
        }
 
        if (gv->tstyle->color_column) {
            nvals = db_select_value(driver, Fi->table, Fi->key, cat,
                                    gv->tstyle->color_column, &value);
            if (nvals < 1)
                continue;
            str = db_get_value_string(&value);
            if (!str)
                continue;
            if (G_str_to_color(str, &red, &grn, &blu) != 1) {
                G_warning(_("Invalid color definition (%s)"), str);
                gvt->style->color = gv->style->color;
            }
            else {
                gvt->style->color = (red & RED_MASK) +
                                    ((int)((grn) << 8) & GRN_MASK) +
                                    ((int)((blu) << 16) & BLU_MASK);
            }
        }
 
        /* width */
        if (gv->tstyle->width_column) {
            nvals = db_select_value(driver, Fi->table, Fi->key, cat,
                                    gv->tstyle->width_column, &value);
            if (nvals < 1)
                continue;
            gvt->style->width = db_get_value_int(&value);
        }
 
        nlines++;
    }
 
    if (nskipped > 0)
        G_warning(
            _("%d features without category. "
              "Unable to determine color rules for features without category."),
            nskipped);
 
    return nlines;
}