dotinit.c

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/* $Id$ $Revision$ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/


#include <time.h>
#include "dot.h"
#include "pack.h"
#include "aspect.h"

static void
dot_init_subg(graph_t * g, graph_t* droot)
{
    graph_t* subg;

    if ((g != agroot(g)))
        agbindrec(g, "Agraphinfo_t", sizeof(Agraphinfo_t), TRUE);
    if (g == droot)
        GD_dotroot(agroot(g)) = droot;
        
    for (subg = agfstsubg(g); subg; subg = agnxtsubg(subg)) {
        dot_init_subg(subg, droot);
    }
}


static void 
dot_init_node(node_t * n)
{
    agbindrec(n, "Agnodeinfo_t", sizeof(Agnodeinfo_t), TRUE);   //graph custom data
    common_init_node(n);
    gv_nodesize(n, GD_flip(agraphof(n)));
    alloc_elist(4, ND_in(n));
    alloc_elist(4, ND_out(n));
    alloc_elist(2, ND_flat_in(n));
    alloc_elist(2, ND_flat_out(n));
    alloc_elist(2, ND_other(n));
    ND_UF_size(n) = 1;
}

static void 
dot_init_edge(edge_t * e)
{
    char *tailgroup, *headgroup;
    agbindrec(e, "Agedgeinfo_t", sizeof(Agedgeinfo_t), TRUE);   //graph custom data
    common_init_edge(e);

    ED_weight(e) = late_int(e, E_weight, 1, 0);
    tailgroup = late_string(agtail(e), N_group, "");
    headgroup = late_string(aghead(e), N_group, "");
    ED_count(e) = ED_xpenalty(e) = 1;
    if (tailgroup[0] && (tailgroup == headgroup)) {
        ED_xpenalty(e) = CL_CROSS;
        ED_weight(e) *= 100;
    }
    if (nonconstraint_edge(e)) {
        ED_xpenalty(e) = 0;
        ED_weight(e) = 0;
    }

    ED_showboxes(e) = late_int(e, E_showboxes, 0, 0);
    ED_minlen(e) = late_int(e, E_minlen, 1, 0);
}

void 
dot_init_node_edge(graph_t * g)
{
    node_t *n;
    edge_t *e;

    for (n = agfstnode(g); n; n = agnxtnode(g, n))
        dot_init_node(n);
    for (n = agfstnode(g); n; n = agnxtnode(g, n)) {
        for (e = agfstout(g, n); e; e = agnxtout(g, e))
            dot_init_edge(e);
    }
}

#if 0                           /* not used */
static void free_edge_list(elist L)
{
    edge_t *e;
    int i;

    for (i = 0; i < L.size; i++) {
        e = L.list[i];
        free(e);
    }
}
#endif

static void 
dot_cleanup_node(node_t * n)
{
    free_list(ND_in(n));
    free_list(ND_out(n));
    free_list(ND_flat_out(n));
    free_list(ND_flat_in(n));
    free_list(ND_other(n));
    free_label(ND_label(n));
    free_label(ND_xlabel(n));
    if (ND_shape(n))
        ND_shape(n)->fns->freefn(n);
    agdelrec(n, "Agnodeinfo_t");        
}

static void free_virtual_edge_list(node_t * n)
{
    edge_t *e;
    int i;

    for (i = ND_in(n).size - 1; i >= 0; i--) {
        e = ND_in(n).list[i];
        delete_fast_edge(e);
        free(e->base.data);
        free(e);
    }
    for (i = ND_out(n).size - 1; i >= 0; i--) {
        e = ND_out(n).list[i];
        delete_fast_edge(e);
        free(e->base.data);
        free(e);
    }
}

static void free_virtual_node_list(node_t * vn)
{
    node_t *next_vn;

    while (vn) {
        next_vn = ND_next(vn);
        free_virtual_edge_list(vn);
        if (ND_node_type(vn) == VIRTUAL) {
            free_list(ND_out(vn));
            free_list(ND_in(vn));
            free(vn->base.data);
            free(vn);
        }
        vn = next_vn;
    }
}

static void 
dot_cleanup_graph(graph_t * g)
{
    int i;
    graph_t *subg;
    for (subg = agfstsubg(g); subg; subg = agnxtsubg(subg)) {
        dot_cleanup_graph(subg);
    }
    if (! agbindrec(g, "Agraphinfo_t", 0, TRUE)) return;
    if (GD_clust(g)) free (GD_clust(g));
    if (GD_rankleader(g)) free (GD_rankleader(g));

    free_list(GD_comp(g));
    if (GD_rank(g)) {
        for (i = GD_minrank(g); i <= GD_maxrank(g); i++)
            free(GD_rank(g)[i].av);
        if (GD_minrank(g) == -1)
            free(GD_rank(g)-1);
        else
            free(GD_rank(g));
    }
    if (g != agroot(g)) {
        free_label (GD_label(g));
        agdelrec(g,"Agraphinfo_t");
    }
}

/* delete the layout (but retain the underlying graph) */
void dot_cleanup(graph_t * g)
{
    node_t *n;
    edge_t *e;

    free_virtual_node_list(GD_nlist(g));
    for (n = agfstnode(g); n; n = agnxtnode(g, n)) {
        for (e = agfstout(g, n); e; e = agnxtout(g, e)) {
            gv_cleanup_edge(e);
        }
        dot_cleanup_node(n);
    }
    dot_cleanup_graph(g);
}

#ifdef DEBUG
int
fastn (graph_t * g)
{
    node_t* u;
    int cnt = 0;
    for (u = GD_nlist(g); u; u = ND_next(u)) cnt++;
    return cnt;
}

#if DEBUG > 1
static void
dumpRanks (graph_t * g)
{
    int i, j;
    node_t* u;
    rank_t *rank = GD_rank(g);
    int rcnt = 0;
    for (i = GD_minrank(g); i <= GD_maxrank(g); i++) {
        fprintf (stderr, "[%d] :", i);
        for (j = 0; j < rank[i].n; j++) {
            u = rank[i].v[j];
            rcnt++;
            if (streq(agnameof(u),"virtual"))
                fprintf (stderr, " %x", u);
            else
                fprintf (stderr, " %s", agnameof(u));
      
        }
        fprintf (stderr, "\n");
    }
    fprintf (stderr, "count %d rank count = %d\n", fastn(g), rcnt);
}
#endif
#endif


static void
remove_from_rank (Agraph_t * g, Agnode_t* n)
{
    Agnode_t* v = NULL;
    int j, rk = ND_rank(n);

    for (j = 0; j < GD_rank(g)[rk].n; j++) {
        v = GD_rank(g)[rk].v[j];
        if (v == n) {
            for (j++; j < GD_rank(g)[rk].n; j++) {
                GD_rank(g)[rk].v[j-1] = GD_rank(g)[rk].v[j];
            }
            GD_rank(g)[rk].n--;
            break;
        }
    }
    assert (v == n);  /* if found */
}

/* removeFill:
 * This removes all of the fill nodes added in mincross.
 * It appears to be sufficient to remove them only from the
 * rank array and fast node list of the root graph.
 */
static void
removeFill (Agraph_t * g)
{
    Agnode_t* n;
    Agnode_t* nxt;
    Agraph_t* sg = agsubg (g, "_new_rank", 0);

    if (!sg) return;
    for (n = agfstnode(sg); n; n = nxt) {
        nxt = agnxtnode(sg, n);
        delete_fast_node (g, n);
        remove_from_rank (g, n);
        dot_cleanup_node (n);
        agdelnode(g, n);
    }
    agdelsubg (g, sg);

}

#define ag_xset(x,a,v) agxset(x,a,v)
#define agnodeattr(g,n,v) agattr(g,AGNODE,n,v)

static void
attach_phase_attrs (Agraph_t * g, int maxphase)
{
    Agsym_t* rk = agnodeattr(g,"rank","");
    Agsym_t* order = agnodeattr(g,"order","");
    Agnode_t* n;
    char buf[BUFSIZ];

    for (n = agfstnode(g); n; n = agnxtnode(g,n)) {
        if (maxphase >= 1) {
            sprintf(buf, "%d", ND_rank(n));
            ag_xset(n,rk,buf);
        }
        if (maxphase >= 2) {
            sprintf(buf, "%d", ND_order(n));
            ag_xset(n,order,buf);
        }
    }
}

static void dotLayout(Agraph_t * g)
{
    aspect_t aspect;
    aspect_t* asp;
    int maxphase = late_int(g, agfindgraphattr(g,"phase"), -1, 1);

    setEdgeType (g, ET_SPLINE);
    asp = setAspect (g, &aspect);

    dot_init_subg(g,g);
    dot_init_node_edge(g);

    do {
        dot_rank(g, asp);
        if (maxphase == 1) {
            attach_phase_attrs (g, 1);
            return;
        }
        if (aspect.badGraph) {
            agerr(AGWARN, "dot does not support the aspect attribute for disconnected graphs or graphs with clusters\n");
            asp = NULL;
            aspect.nextIter = 0;
        }
        dot_mincross(g, (asp != NULL));
        if (maxphase == 2) {
            attach_phase_attrs (g, 2);
            return;
        }
        dot_position(g, asp);
        if (maxphase == 3) {
            attach_phase_attrs (g, 2);  /* positions will be attached on output */
            return;
        }
        aspect.nPasses--;
    } while (aspect.nextIter && aspect.nPasses);
    if (GD_flags(g) & NEW_RANK)
        removeFill (g);
    dot_sameports(g);
    dot_splines(g);
    if (mapbool(agget(g, "compound")))
        dot_compoundEdges(g);
}

static void
initSubg (Agraph_t* sg, Agraph_t* g)
{
    agbindrec(sg, "Agraphinfo_t", sizeof(Agraphinfo_t), TRUE);
    GD_drawing(sg) = NEW(layout_t);
    GD_drawing(sg)->quantum = GD_drawing(g)->quantum; 
    GD_drawing(sg)->dpi = GD_drawing(g)->dpi;
    GD_gvc(sg) = GD_gvc (g);
    GD_charset(sg) = GD_charset (g);
    GD_rankdir2(sg) = GD_rankdir2 (g);
    GD_nodesep(sg) = GD_nodesep(g);
    GD_ranksep(sg) = GD_ranksep(g);
    GD_fontnames(sg) = GD_fontnames(g);
}

/* attachPos:
 * the packing library assumes all units are in inches stored in ND_pos, so we
 * have to copy the position info there.
 */
static void
attachPos (Agraph_t* g)
{
    node_t* np;
    double* ps = N_NEW(2*agnnodes(g), double);

    for (np = agfstnode(g); np; np = agnxtnode(g, np)) {
        ND_pos(np) = ps;
        ps[0] = PS2INCH(ND_coord(np).x);
        ps[1] = PS2INCH(ND_coord(np).y);
        ps += 2;
    }
}

/* resetCoord:
 * Store new position info from pack library call, stored in ND_pos in inches,
 * back to ND_coord in points.
 */
static void
resetCoord (Agraph_t* g)
{
    node_t* np = agfstnode(g);
    double* sp = ND_pos(np);
    double* ps = sp;

    for (np = agfstnode(g); np; np = agnxtnode(g, np)) {
        ND_pos(np) = 0;
        ND_coord(np).x = INCH2PS(ps[0]);
        ND_coord(np).y = INCH2PS(ps[1]);
        ps += 2;
    }
    free (sp);
}

/* copyCluster:
 */
static void
copyCluster (Agraph_t* scl, Agraph_t* cl)
{
    int nclust, j;
    Agraph_t* cg;

    agbindrec(cl, "Agraphinfo_t", sizeof(Agraphinfo_t), TRUE);
    GD_bb(cl) = GD_bb(scl);
    GD_label_pos(cl) = GD_label_pos(scl);
    memcpy(GD_border(cl), GD_border(scl), 4*sizeof(pointf));
    nclust = GD_n_cluster(cl) = GD_n_cluster(scl);
    GD_clust(cl) = N_NEW(nclust+1,Agraph_t*);
    for (j = 1; j <= nclust; j++) {
        cg = mapClust(GD_clust(scl)[j]);
        GD_clust(cl)[j] = cg;
        copyCluster (GD_clust(scl)[j], cg);
    }
    /* transfer cluster label to original cluster */
    GD_label(cl) = GD_label(scl);
    GD_label(scl) = NULL;
}

/* copyClusterInfo:
 * Copy cluster tree and info from components to main graph.
 * Note that the original clusters have no Agraphinfo_t at this time.
 */
static void
copyClusterInfo (int ncc, Agraph_t** ccs, Agraph_t* root)
{
    int j, i, nclust = 0;
    Agraph_t* sg;
    Agraph_t* cg;

    for (i = 0; i < ncc; i++) 
        nclust += GD_n_cluster(ccs[i]);

    GD_n_cluster(root) = nclust;
    GD_clust(root) = N_NEW(nclust+1,Agraph_t*);
    nclust = 1;
    for (i = 0; i < ncc; i++) {
        sg = ccs[i];
        for (j = 1; j <= GD_n_cluster(sg); j++) {
            cg = mapClust(GD_clust(sg)[j]);
            GD_clust(root)[nclust++] = cg;
            copyCluster (GD_clust(sg)[j], cg);
        }
    } 
}

/* doDot:
 * Assume g has nodes.
 */
static void doDot (Agraph_t* g)
{
    Agraph_t **ccs;
    Agraph_t *sg;
    int ncc;
    int i;
    pack_info pinfo;
    int Pack = getPack(g, -1, CL_OFFSET);
    pack_mode mode = getPackModeInfo (g, l_undef, &pinfo);
    getPackInfo(g, l_node, CL_OFFSET, &pinfo);

    if ((mode == l_undef) && (Pack < 0)) {
        /* No pack information; use old dot with components
         * handled during layout
         */
        dotLayout(g);
    } else {
        /* fill in default values */
        if (mode == l_undef) 
            pinfo.mode = l_graph;
        else if (Pack < 0)
            Pack = CL_OFFSET;
        pinfo.margin = Pack;
        pinfo.fixed = 0;

          /* components using clusters */
        ccs = cccomps(g, &ncc, 0);
        if (ncc == 1) {
            dotLayout(g);
        } else if (GD_drawing(g)->ratio_kind == R_NONE) {
            pinfo.doSplines = 1;

            for (i = 0; i < ncc; i++) {
                sg = ccs[i];
                initSubg (sg, g);
                dotLayout (sg);
            }
            attachPos (g);
            packSubgraphs(ncc, ccs, g, &pinfo);
            resetCoord (g);
            copyClusterInfo (ncc, ccs, g);
        } else {
            /* Not sure what semantics should be for non-trivial ratio
             * attribute with multiple components.
             * One possibility is to layout nodes, pack, then apply the ratio
             * adjustment. We would then have to re-adjust all positions.
             */
            dotLayout(g);
        }

        for (i = 0; i < ncc; i++) {
            free (GD_drawing(ccs[i]));
            dot_cleanup_graph(ccs[i]);
            agdelete(g, ccs[i]);
        }
        free(ccs);
    }
}

void dot_layout(Agraph_t * g)
{
    if (agnnodes(g)) doDot (g);
    dotneato_postprocess(g);
}

Agraph_t * dot_root (void* p)
{
    return GD_dotroot(agroot(p));
}