gvl2.c

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/*!
   \file lib/ogsf/gvl2.c
 
   \brief OGSF library - loading and manipulating volumes
 
   GRASS OpenGL gsurf OGSF Library
 
   (C) 1999-2008 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 UI-GMSL (May 1997)
   Tomas Paudits (February 2004)
 */
 
#include <string.h>
#include <grass/gis.h>
#include <grass/raster3d.h>
#include <grass/ogsf.h>
#include <grass/glocale.h>
#include "gsget.h"
 
static int Vol_ID[MAX_VOLS];
static int Next_vol = 0;
 
static RASTER3D_Region wind3;
static double Region[6];
 
/*!
   \brief Library initialization for volumes
 
   Set region extent (N,S,W,E,T,B)
 */
void GVL_libinit(void)
{
    Rast3d_init_defaults();
    Rast3d_get_window(&wind3);
 
    Region[0] = wind3.north;
    Region[1] = wind3.south;
    Region[2] = wind3.west;
    Region[3] = wind3.east;
    Region[4] = wind3.top;
    Region[5] = wind3.bottom;
 
    return;
}
 
/*!
   \brief Initialize 3D region
 
   Set region extent (N,S,W,E,T,B)
 */
void GVL_init_region(void)
{
    Rast3d_read_window(&wind3, NULL);
 
    Region[0] = wind3.north;
    Region[1] = wind3.south;
    Region[2] = wind3.west;
    Region[3] = wind3.east;
    Region[4] = wind3.top;
    Region[5] = wind3.bottom;
 
    return;
}
 
/*!
   \brief Get region extent settings
 
   \param[out] n,s,w,e north, south, west, east
   \param[out] t,b top, bottom
 
   \return 1
 */
int GVL_get_region(float *n, float *s, float *w, float *e, float *t, float *b)
{
    *n = Region[0];
    *s = Region[1];
    *w = Region[2];
    *e = Region[3];
    *t = Region[4];
    *b = Region[5];
 
    return (1);
}
 
/*!
   \brief Get window
 
   \todo gvl_file.c use this - change
 
   \return pointer to RASTER3D_Region struct (static)
 */
void *GVL_get_window(void)
{
    return &wind3;
}
 
/*!
   \brief Check if volume set exists
 
   \param id volume set id
 
   \return 1 found
   \return 0 not found
 */
int GVL_vol_exists(int id)
{
    int i, found = 0;
 
    G_debug(3, "GVL_vol_exists");
 
    if (NULL == gvl_get_vol(id)) {
        return (0);
    }
 
    for (i = 0; i < Next_vol && !found; i++) {
        if (Vol_ID[i] == id) {
            found = 1;
        }
    }
 
    return (found);
}
 
/*!
   \brief Create new volume set
 
   \return volume set id
   \return -1 on error
 */
int GVL_new_vol(void)
{
    geovol *nvl;
 
    G_debug(3, "GVL_new_vol():");
 
    if (Next_vol < MAX_VOLS) {
        nvl = gvl_get_new_vol();
 
        gvl_init_vol(nvl, wind3.west + wind3.ew_res / 2.,
                     wind3.south + wind3.ns_res / 2., wind3.bottom, wind3.rows,
                     wind3.cols, wind3.depths, wind3.ew_res, wind3.ns_res,
                     wind3.tb_res);
 
        Vol_ID[Next_vol] = nvl->gvol_id;
        ++Next_vol;
 
        G_debug(3, "    id=%d", nvl->gvol_id);
 
        return (nvl->gvol_id);
    }
 
    return (-1);
}
 
/*!
   \brief Get number of loaded volume sets
 
   \return number of volume sets
 */
int GVL_num_vols(void)
{
    return (gvl_num_vols());
}
 
/*!
   \brief Get list of loaded volume sets
 
   Must be freed if not needed!
 
   \param[out] numvols number of volume sets
 
   \return pointer to list of volume sets
   \return NULL on error
 */
int *GVL_get_vol_list(int *numvols)
{
    int i, *ret;
 
    *numvols = Next_vol;
 
    if (Next_vol) {
        ret = (int *)G_malloc(Next_vol * sizeof(int));
        if (!ret)
            return (NULL);
 
        for (i = 0; i < Next_vol; i++) {
            ret[i] = Vol_ID[i];
        }
 
        return (ret);
    }
 
    return (NULL);
}
 
/*!
   \brief Delete volume set from list
 
   \param id volume set id
 
   \return 1 on success
   \return -1 on error (invalid volume set id)
 */
int GVL_delete_vol(int id)
{
    int i, j, found = 0;
 
    G_debug(3, "GVL_delete_vol");
 
    if (GVL_vol_exists(id)) {
 
        for (i = 0; i < GVL_isosurf_num_isosurfs(id); i++) {
            GVL_isosurf_del(id, 0);
        }
 
        for (i = 0; i < GVL_slice_num_slices(id); i++) {
            GVL_slice_del(id, 0);
        }
 
        gvl_delete_vol(id);
 
        for (i = 0; i < Next_vol && !found; i++) {
            if (Vol_ID[i] == id) {
                found = 1;
                for (j = i; j < Next_vol; j++) {
                    Vol_ID[j] = Vol_ID[j + 1];
                }
            }
        }
 
        if (found) {
            --Next_vol;
 
            return (1);
        }
    }
 
    return (-1);
}
 
/*!
   \brief Load 3d raster map to volume set
 
   \param id volume set id
   \param filename 3d raster map name
 
   \return -1 on error
   \return 0 on success
 */
int GVL_load_vol(int id, const char *filename)
{
    geovol *gvl;
    int handle;
 
    G_debug(3, "GVL_load_vol(): id=%d, name=%s", id, filename);
 
    if (NULL == (gvl = gvl_get_vol(id))) {
        return (-1);
    }
 
    G_message(_("Loading 3d raster map <%s>..."), filename);
 
    if (0 > (handle = gvl_file_newh(filename, VOL_FTYPE_RASTER3D)))
        return (-1);
 
    gvl->hfile = handle;
 
    return (0);
}
 
/*!
   \brief Get volume set name
 
   \param id volume set id
   \param[out] filename name (must be allocated)
 
   \return -1 on error
   \return 1 on success
 */
int GVL_get_volname(int id, char *filename)
{
    geovol *gvl;
 
    if (NULL == (gvl = gvl_get_vol(id))) {
        return (-1);
    }
 
    if (0 > gvl->hfile) {
        return (-1);
    }
 
    strcpy(filename, gvl_file_get_name(gvl->hfile));
 
    return (1);
}
 
/*!
   \brief Get volume dimensions
 
   \param id volume set id
   \param[out] rows,cols,depths number of rows, cols, depths
 */
void GVL_get_dims(int id, int *rows, int *cols, int *depths)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *rows = gvl->rows;
        *cols = gvl->cols;
        *depths = gvl->depths;
 
        G_debug(3, "GVL_get_dims() id=%d, rows=%d, cols=%d, depths=%d",
                gvl->gvol_id, gvl->rows, gvl->cols, gvl->depths);
    }
    else {
        G_debug(2,
                "GVL_get_dims(): Attempted to access a null volume structure "
                "for id=%d",
                id);
    }
 
    return;
}
 
/*!
   \brief Set trans ?
 
   \param id volume set id
   \param xtrans,ytrans,ztrans x/y/z trans values
 */
void GVL_set_trans(int id, float xtrans, float ytrans, float ztrans)
{
    geovol *gvl;
 
    G_debug(3, "GVL_set_trans");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->x_trans = xtrans;
        gvl->y_trans = ytrans;
        gvl->z_trans = ztrans;
    }
 
    return;
}
 
/*!
   \brief Get trans ?
 
   \param id volume set id
   \param[out] xtrans,ytrans,ztrans x/y/z trans values
 
   \return 1 on success
   \return -1 on error
 */
int GVL_get_trans(int id, float *xtrans, float *ytrans, float *ztrans)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *xtrans = gvl->x_trans;
        *ytrans = gvl->y_trans;
        *ztrans = gvl->z_trans;
 
        return (1);
    }
 
    return (-1);
}
 
/*!
   \brief Set drawing wire box
 
   \param id volume set id
   \param draw_wire 1 for drawing wire, 0 otherwise
 */
void GVL_set_draw_wire(int id, int draw_wire)
{
    geovol *gvl;
 
    G_debug(3, "GVL_set_draw_wire");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->draw_wire = draw_wire;
    }
 
    return;
}
 
/*!
   \brief Draw volume set
 
   \param vid volume set id
 */
void GVL_draw_vol(int vid)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(vid);
 
    if (gvl) {
        gvld_vol(gvl);
        if (gvl->draw_wire) {
            gvld_wind3_box(gvl);
        }
    }
 
    return;
}
 
/*!
   \brief Draw volume in wire mode
 
   \param id volume set id
 */
void GVL_draw_wire(int id)
{
    geovol *gvl;
 
    G_debug(3, "GVL_draw_wire(): id=%d", id);
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvld_wire_vol(gvl);
    }
 
    return;
}
 
/*!
   \brief Draw all volume sets
 */
void GVL_alldraw_vol(void)
{
    int id;
 
    for (id = 0; id < Next_vol; id++) {
        GVL_draw_vol(Vol_ID[id]);
    }
 
    return;
}
 
/*!
   \brief Draw all volume sets in wire mode
 */
void GVL_alldraw_wire(void)
{
    int id;
 
    for (id = 0; id < Next_vol; id++) {
        GVL_draw_wire(Vol_ID[id]);
    }
 
    return;
}
 
/*!
   \brief Set client data for volume set
 
   \param id volume set id
   \param clientd pointer to client data
 
   \return 1 on success
   \return -1 on error
 */
int GVL_Set_ClientData(int id, void *clientd)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->clientdata = clientd;
 
        return (1);
    }
 
    return (-1);
}
 
/*!
   \brief Get client data
 
   \param id volume set id
 
   \return pointer to client data
   \return NULL on error
 */
void *GVL_Get_ClientData(int id)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        return (gvl->clientdata);
    }
 
    return (NULL);
}
 
/*!
   \brief Set focus on map center
 
   \param id volume set id
 */
void GVL_set_focus_center_map(int id)
{
    float center[3];
    geovol *gvl;
 
    G_debug(3, "GS_set_focus_center_map");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        center[X] = (gvl->xmax - gvl->xmin) / 2.;
        center[Y] = (gvl->ymax - gvl->ymin) / 2.;
        center[Z] = (gvl->zmax - gvl->zmin) / 2.;
 
        GS_set_focus(center);
    }
 
    return;
}
 
/************************************************************************/
/* ISOSURFACES */
 
/************************************************************************/
 
/*!
   \brief Get draw resolution for isosurface
 
   \todo error handling
 
   \param id volume set id
   \param[out] xres,yres,zres x/y/z resolution value
 */
void GVL_isosurf_get_drawres(int id, int *xres, int *yres, int *zres)
{
    geovol *gvl;
 
    G_debug(3, "GVL_isosurf_get_drawres");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *xres = gvl->isosurf_x_mod;
        *yres = gvl->isosurf_y_mod;
        *zres = gvl->isosurf_z_mod;
    }
 
    return;
}
 
/*!
   \brief Set isosurface draw resolution
 
   \param id volume set id
   \param xres,yres,zres x/y/z resolution value
 
   \return -1 on error (invalid values/volume set id)
   \return 0 on success
 */
int GVL_isosurf_set_drawres(int id, int xres, int yres, int zres)
{
    geovol *gvl;
    int i;
 
    G_debug(3, "GVL_isosurf_set_drawres(): id=%d", id);
 
    if (xres < 1 || yres < 1 || zres < 1) {
        return (-1);
    }
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->isosurf_x_mod = xres;
        gvl->isosurf_y_mod = yres;
        gvl->isosurf_z_mod = zres;
 
        for (i = 0; i < gvl->n_isosurfs; i++) {
            gvl_isosurf_set_att_changed(gvl->isosurf[i], ATT_TOPO);
        }
 
        return (0);
    }
 
    return (-1);
}
 
/*!
   \brief Get isosurface draw mode
 
   \param id volume set id
   \param[out] mode draw-mode
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_get_drawmode(int id, int *mode)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *mode = gvl->isosurf_draw_mode;
 
        return (1);
    }
 
    return (-1);
}
 
/*!
   \brief Set isosurface draw mode
 
   \param id volume set id
   \param mode draw mode
 
   \return 0 on success
   \return -1 on error (invalid volume set id)
 */
int GVL_isosurf_set_drawmode(int id, int mode)
{
    geovol *gvl;
 
    G_debug(3, "GVL_isosurf_set_drawmode(): id=%d mode=%d", id, mode);
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->isosurf_draw_mode = mode;
 
        return (0);
    }
 
    return (-1);
}
 
/*!
   \brief Add isosurface
 
   \param id volume set id
 
   \return -1 on error (invalid volume set id
   \return 1 on success
 */
int GVL_isosurf_add(int id)
{
    geovol *gvl;
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_add() id=%d", id);
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (gvl->n_isosurfs == MAX_ISOSURFS)
        return (-1);
 
    isosurf = (geovol_isosurf *)G_malloc(sizeof(geovol_isosurf));
    if (!isosurf) {
        return (-1);
    }
 
    gvl_isosurf_init(isosurf);
 
    gvl->n_isosurfs++;
    gvl->isosurf[gvl->n_isosurfs - 1] = (geovol_isosurf *)isosurf;
 
    return (1);
}
 
/*!
   \brief Delete isosurface
 
   \param id volume set id
   \param isosurf_id isosurface id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_isosurf_del(int id, int isosurf_id)
{
    geovol *gvl;
    geovol_isosurf *isosurf;
    int i;
 
    G_debug(3, "GVL_isosurf_del");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (!isosurf)
        return (-1);
 
    if (!gvl_isosurf_freemem(isosurf)) {
        return (-1);
    }
 
    gvl = gvl_get_vol(id);
 
    G_free(gvl->isosurf[isosurf_id]);
 
    for (i = isosurf_id + 1; i < gvl->n_isosurfs; i++) {
        gvl->isosurf[i - 1] = gvl->isosurf[i];
    }
 
    gvl->n_isosurfs--;
 
    return (1);
}
 
/*!
   \brief Move up isosurface in list
 
   \param id volume set id
   \param isosurf_id isosurface id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_isosurf_move_up(int id, int isosurf_id)
{
    geovol *gvl;
    geovol_isosurf *tmp;
 
    G_debug(3, "GVL_isosurf_move_up");
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (isosurf_id < 0 || isosurf_id > (gvl->n_isosurfs - 1))
        return (-1);
 
    if (isosurf_id == 0)
        return (1);
 
    tmp = gvl->isosurf[isosurf_id - 1];
    gvl->isosurf[isosurf_id - 1] = gvl->isosurf[isosurf_id];
    gvl->isosurf[isosurf_id] = tmp;
 
    return (1);
}
 
/*!
   \brief Move down isosurface in list
 
   \param id volume set id
   \param isosurf_id isosurface id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_isosurf_move_down(int id, int isosurf_id)
{
    geovol *gvl;
    geovol_isosurf *tmp;
 
    G_debug(3, "GVL_isosurf_move_up");
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (isosurf_id < 0 || isosurf_id > (gvl->n_isosurfs - 1))
        return (-1);
 
    if (isosurf_id == (gvl->n_isosurfs - 1))
        return (1);
 
    tmp = gvl->isosurf[isosurf_id + 1];
    gvl->isosurf[isosurf_id + 1] = gvl->isosurf[isosurf_id];
    gvl->isosurf[isosurf_id] = tmp;
 
    return (1);
}
 
/*!
   \brief Get isosurface attributes
 
   \param id volume set id
   \param isosurf_id surface id
   \param att attribute id
   \param[out] set
   \param[out] constant
   \param[out] mapname
 
   \return -1 on error
   \return 1 on success
 */
int GVL_isosurf_get_att(int id, int isosurf_id, int att, int *set,
                        float *constant, char *mapname)
{
    int src;
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_get_att");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        if (-1 != (src = gvl_isosurf_get_att_src(isosurf, att))) {
            *set = src;
 
            if (src == CONST_ATT) {
                *constant = isosurf->att[att].constant;
            }
            else if (src == MAP_ATT) {
                strcpy(mapname, gvl_file_get_name(isosurf->att[att].hfile));
            }
 
            return (1);
        }
 
        return (-1);
    }
 
    return (-1);
}
 
/*!
   \brief Unset isosurface attributes
 
   \param id volume set id
   \param isosurface_id isosurface id
   \param att attribute id
 
   \return ?
   \return -1 on error
 */
int GVL_isosurf_unset_att(int id, int isosurf_id, int att)
{
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_unset_att");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        return (gvl_isosurf_set_att_src(isosurf, att, NOTSET_ATT));
    }
 
    return (-1);
}
 
/*!
   \brief Set constant isosurface attribute
 
   Attributes:
   - ATT_NORM
   - ATT_TOPO topography (level) constant
   - ATT_COLOR color map/constant
   - ATT_MASK mask map
   - ATT_TRANSP transparency map/constant
   - ATT_SHINE shininess map/constant
   - ATT_EMIT emission map/constant
 
   \param id volume set id
   \param isosurf_id isosurface id (0 - MAX_ISOSURFS)
   \param att attribute descriptor
   \param constant constant value
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_set_att_const(int id, int isosurf_id, int att, float constant)
{
    geovol_isosurf *isosurf;
 
    G_debug(3,
            "GVL_isosurf_set_att_const() id=%d isosurf_id=%d "
            "att=%d const=%f",
            id, isosurf_id, att, constant);
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        return (gvl_isosurf_set_att_const(isosurf, att, constant));
    }
 
    return (-1);
}
 
/*!
   \brief Set isosurface map attribute
 
   Attributes:
   - ATT_NORM
   - ATT_TOPO topography (level) constant
   - ATT_COLOR color map/constant
   - ATT_MASK mask map
   - ATT_TRANSP transparency map/constant
   - ATT_SHINE shininess map/constant
   - ATT_EMIT emission map/constant
 
   \param id volume set id
   \param isosurf_id isosurface id (0 - MAX_ISOSURFS)
   \param att attribute descriptor
   \param filename map name
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_set_att_map(int id, int isosurf_id, int att,
                            const char *filename)
{
    geovol_isosurf *isosurf;
 
    G_debug(3,
            "GVL_isosurf_set_att_map(): id=%d, isosurf_id=%d "
            "att=%d map=%s",
            id, isosurf_id, att, filename);
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        return gvl_isosurf_set_att_map(isosurf, att, filename);
    }
 
    return (-1);
}
 
/*!
   \brief Get isosurface flags
 
   \param id volume set id
   \param isosurf_id isosurface id
   \param[out] inout map name
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_get_flags(int id, int isosurf_id, int *inout)
{
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_get_flags");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        *inout = isosurf->inout_mode;
 
        return (1);
    }
    return (-1);
}
 
/*!
   \brief Set isosurface flags
 
   \param id volume set id
   \param isosurf_id isosurface id
   \param inout map name
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_set_flags(int id, int isosurf_id, int inout)
{
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_get_flags");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        isosurf->inout_mode = inout;
 
        return (1);
    }
 
    return (-1);
}
 
/*!
   \brief Get number of available isosurfaces
 
   \param id volume set id
 
   \return number of isosurfaces
   \return -1 on error
 */
int GVL_isosurf_num_isosurfs(int id)
{
    geovol *gvl;
 
    G_debug(3, "GVL_isosurf_num_isosurfs");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        return gvl->n_isosurfs;
    }
 
    return (-1);
}
 
/*!
   \brief Set mask attribute mode
 
   Mask attribute special: constant is set to indicate invert or no
 
   \param id volume set id
   \param isosurf_id isosurface id
   \param mode attribute mode
 
   \return mode id
   \return -1 on error
 */
int GVL_isosurf_set_maskmode(int id, int isosurf_id, int mode)
{
    geovol_isosurf *isosurf;
 
    G_debug(3, "GVL_isosurf_set_att_const");
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        isosurf->att[ATT_MASK].constant = mode;
 
        return (mode);
    }
 
    return (-1);
}
 
/*!
   \brief Get isosurface mask mode
 
   \param id volume set id
   \param isosurf_id isosurface id
   \param mode attribute mode
 
   \return 1 on success
   \return -1 on error
 */
int GVL_isosurf_get_maskmode(int id, int isosurf_id, int *mode)
{
    geovol_isosurf *isosurf;
 
    isosurf = gvl_isosurf_get_isosurf(id, isosurf_id);
 
    if (isosurf) {
        *mode = isosurf->att[ATT_MASK].constant;
 
        return (1);
    }
 
    return (-1);
}
 
/************************************************************************/
/* SLICES */
 
/************************************************************************/
 
/*!
   \brief Get draw resolution of slice
 
   \param id volume set id
   \param[out] xres,yres,zres x/y/z resolution value
 */
void GVL_slice_get_drawres(int id, int *xres, int *yres, int *zres)
{
    geovol *gvl;
 
    G_debug(3, "GVL_slice_get_drawres");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *xres = gvl->slice_x_mod;
        *yres = gvl->slice_y_mod;
        *zres = gvl->slice_z_mod;
    }
 
    return;
}
 
/*!
   \brief Set slice draw resolution
 
   \param id volume set id
   \param xres,yres,zres x/y/z resolution value
 
   \return 0 on success
   \return -1 on error (invalid value or id)
 */
int GVL_slice_set_drawres(int id, int xres, int yres, int zres)
{
    geovol *gvl;
    int i;
 
    G_debug(3, "GVL_slice_set_drawres(): id=%d", id);
 
    if (xres < 1 || yres < 1 || zres < 1) {
        return (-1);
    }
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->slice_x_mod = xres;
        gvl->slice_y_mod = yres;
        gvl->slice_z_mod = zres;
 
        for (i = 0; i < gvl->n_slices; i++) {
            gvl->slice[i]->changed = 1;
        }
 
        return (0);
    }
 
    return (-1);
}
 
/*!
   \brief Get slice draw mode
 
   \param id volume set id
   \param[out] mode draw mode
 
   \return 1 on success
   \return -1 on error (invalid id)
 */
int GVL_slice_get_drawmode(int id, int *mode)
{
    geovol *gvl;
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        *mode = gvl->slice_draw_mode;
 
        return (1);
    }
 
    return (-1);
}
 
/*!
   \brief Set slice draw mode
 
   \param id volume set id
   \param mode draw mode
 
   \return 0 on success
   \return -1 on error (invalid id)
 */
int GVL_slice_set_drawmode(int id, int mode)
{
    geovol *gvl;
 
    G_debug(3, "GVL_slice_set_drawmode(): id=%d, mode=%d", id, mode);
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        gvl->slice_draw_mode = mode;
 
        return (0);
    }
 
    return (-1);
}
 
/*!
   \brief Add slice
 
   \param id volume set id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_add(int id)
{
    geovol *gvl;
    geovol_slice *slice;
 
    G_debug(3, "GVL_slice_add");
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (gvl->n_slices == MAX_SLICES)
        return (-1);
 
    if (NULL == (slice = (geovol_slice *)G_malloc(sizeof(geovol_slice)))) {
        return (-1);
    }
 
    gvl_slice_init(slice);
 
    gvl->n_slices++;
    gvl->slice[gvl->n_slices - 1] = (geovol_slice *)slice;
 
    return (1);
}
 
/*!
   \brief Delete slice
 
   \param id volume set id
   \param slice_id slice id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_del(int id, int slice_id)
{
    geovol *gvl;
    geovol_slice *slice;
    int i;
 
    G_debug(3, "GVL_slice_del");
 
    slice = gvl_slice_get_slice(id, slice_id);
 
    if (!slice)
        return (-1);
 
    if (!gvl_slice_freemem(slice)) {
        return (-1);
    }
 
    gvl = gvl_get_vol(id);
 
    G_free(gvl->slice[slice_id]);
 
    for (i = slice_id + 1; i < gvl->n_slices; i++) {
        gvl->slice[i - 1] = gvl->slice[i];
    }
 
    gvl->n_slices--;
 
    return (1);
}
 
/*!
   \brief Move up slice
 
   \param id volume set id
   \param slice_id slice id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_move_up(int id, int slice_id)
{
    geovol *gvl;
    geovol_slice *tmp;
 
    G_debug(3, "GVL_slice_move_up");
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (slice_id < 0 || slice_id > (gvl->n_slices - 1))
        return (-1);
 
    if (slice_id == 0)
        return (1);
 
    tmp = gvl->slice[slice_id - 1];
    gvl->slice[slice_id - 1] = gvl->slice[slice_id];
    gvl->slice[slice_id] = tmp;
 
    return (1);
}
 
/*!
   \brief Move down slice
 
   \param id volume set id
   \param slice_id slice id
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_move_down(int id, int slice_id)
{
    geovol *gvl;
    geovol_slice *tmp;
 
    G_debug(3, "GVL_slice_move_up");
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    if (slice_id < 0 || slice_id > (gvl->n_slices - 1))
        return (-1);
 
    if (slice_id == (gvl->n_slices - 1))
        return (1);
 
    tmp = gvl->slice[slice_id + 1];
    gvl->slice[slice_id + 1] = gvl->slice[slice_id];
    gvl->slice[slice_id] = tmp;
 
    return (1);
}
 
/*!
   \brief Get number or slices
 
   \param id volume set id
 
   \return number of slices
   \return -1 on error
 */
int GVL_slice_num_slices(int id)
{
    geovol *gvl;
 
    G_debug(3, "GVL_isosurf_num_isosurfs");
 
    gvl = gvl_get_vol(id);
 
    if (gvl) {
        return gvl->n_slices;
    }
 
    return (-1);
}
 
/*!
   \brief Get slice position
 
   \param id volume set id
   \param slice_id slice id
   \param[out] x1,y1,z1 coordinates ?
   \param[out] x2,y2,z2 coordinates ?
   \param[out] dir direction
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_get_pos(int id, int slice_id, float *x1, float *x2, float *y1,
                      float *y2, float *z1, float *z2, int *dir)
{
    geovol *gvl;
    geovol_slice *slice;
    int cols, rows, depths;
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    slice = gvl_slice_get_slice(id, slice_id);
 
    if (!slice)
        return (-1);
 
    if (slice->dir == X) {
        cols = gvl->rows;
        rows = gvl->depths;
        depths = gvl->cols;
    }
    else if (slice->dir == Y) {
        cols = gvl->cols;
        rows = gvl->depths;
        depths = gvl->rows;
    }
    else if (slice->dir == Z) {
        cols = gvl->cols;
        rows = gvl->rows;
        depths = gvl->depths;
    }
    else {
        return (-1);
    }
 
    *x1 = slice->x1 / (cols - 1);
    *x2 = slice->x2 / (cols - 1);
    *y1 = slice->y1 / (rows - 1);
    *y2 = slice->y2 / (rows - 1);
    *z1 = slice->z1 / (depths - 1);
    *z2 = slice->z2 / (depths - 1);
 
    *dir = slice->dir;
 
    return (1);
}
 
/*!
   \brief Get slice position
 
   \param id volume set id
   \param slice_id slice id
   \param x1,y1,z1 coordinates ?
   \param x2,y2,z2 coordinates ?
   \param dir direction
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_set_pos(int id, int slice_id, float x1, float x2, float y1,
                      float y2, float z1, float z2, int dir)
{
    geovol *gvl;
    geovol_slice *slice;
    int cols, rows, depths;
 
    gvl = gvl_get_vol(id);
 
    if (!gvl)
        return (-1);
 
    slice = gvl_slice_get_slice(id, slice_id);
 
    if (!slice)
        return (-1);
 
    if (dir == X) {
        cols = gvl->rows;
        rows = gvl->depths;
        depths = gvl->cols;
    }
    else if (dir == Y) {
        cols = gvl->cols;
        rows = gvl->depths;
        depths = gvl->rows;
    }
    else if (dir == Z) {
        cols = gvl->cols;
        rows = gvl->rows;
        depths = gvl->depths;
    }
    else {
        return (-1);
    }
 
    slice->x1 = ((x1 < 0.) ? 0. : ((x1 > 1.) ? 1. : x1)) * (cols - 1);
    slice->x2 = ((x2 < 0.) ? 0. : ((x2 > 1.) ? 1. : x2)) * (cols - 1);
    slice->y1 = ((y1 < 0.) ? 0. : ((y1 > 1.) ? 1. : y1)) * (rows - 1);
    slice->y2 = ((y2 < 0.) ? 0. : ((y2 > 1.) ? 1. : y2)) * (rows - 1);
    slice->z1 = ((z1 < 0.) ? 0. : ((z1 > 1.) ? 1. : z1)) * (depths - 1);
    slice->z2 = ((z2 < 0.) ? 0. : ((z2 > 1.) ? 1. : z2)) * (depths - 1);
 
    slice->dir = dir;
 
    slice->changed = 1;
 
    return (1);
}
 
/*!
   \brief Get slice trans ?
 
   \param id volume set id
   \param slice_id slice id
   \param[out] transp transp value
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_get_transp(int id, int slice_id, int *transp)
{
    geovol_slice *slice;
 
    G_debug(3, "GVL_get_transp");
 
    slice = gvl_slice_get_slice(id, slice_id);
 
    if (!slice)
        return (-1);
 
    *transp = slice->transp;
 
    return (1);
}
 
/*!
   \brief Set slice trans ?
 
   \param id volume set id
   \param slice_id slice id
   \param transp transp value
 
   \return -1 on error
   \return 1 on success
 */
int GVL_slice_set_transp(int id, int slice_id, int transp)
{
    geovol_slice *slice;
 
    G_debug(3, "GVL_set_transp");
 
    slice = gvl_slice_get_slice(id, slice_id);
 
    if (!slice)
        return (-1);
 
    slice->transp = transp;
 
    return (1);
}