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#include <dag.h>
#ifdef DMALLOC
#include "dmalloc.h"
#endif
#define EQPASS 1
void dd_opt_path(ddview_t *view, ddpath_t *path)
{
int pass;
Agedge_t *e, *first, *last;
for (pass = 0; pass < MINCROSS_PASSES; pass++) {
if (!(path->first) || !(path->last)) continue;
if (pass % 2 == 0) {
first = AGMKOUT(path->first);
last = AGMKOUT(path->last);
for (e = first; e != last; e = agfstout(e->node))
dd_opt_elt(view,e->node,UP,(pass%4)<2);
}
else {
first = AGMKIN(path->first);
last = AGMKIN(path->last);
for (e = last; e != first; e = agfstin(e->node))
dd_opt_elt(view,e->node,DOWN,(pass%4)<2);
}
}
}
static ilbool leftgoing(ddview_t *view, Agnode_t *n, int dir, int eq_pass)
{
Agnode_t *left;
left = dd_left(view,n);
if (left) {
int uvx,vux,diff;
uvx = dd_uvcross(left,n,dir==UP,dir==DOWN);
vux = dd_uvcross(n,left,dir==UP,dir==DOWN);
diff = uvx - vux;
#ifdef EQPASS
if ((diff > 0) || ((diff == 0) && eq_pass))
#else
if (diff > 0)
#endif
return TRUE;
}
if (NOT(dd_mval_exists(n,dir))) return FALSE;
while (left) {
if (dd_mval_exists(left,dir)) {
return (dd_mval(n,dir) < dd_mval(left,dir));
}
left = dd_left(view,left);
}
return FALSE;
}
static void shift_left(ddview_t *view, Agnode_t *n)
{
dd_exchange(view,dd_left(view,n),n);
}
static ilbool rightgoing(ddview_t *view, Agnode_t *n, int dir, int eq_pass)
{
Agnode_t *right;
right = dd_right(view,n);
if (right) {
int uvx,vux,diff;
uvx = dd_uvcross(n,right,dir==UP,dir==DOWN);
vux = dd_uvcross(right,n,dir==UP,dir==DOWN);
diff = uvx - vux;
#ifdef EQPASS
if ((diff > 0) || ((diff == 0) && eq_pass))
#else
if (diff > 0)
#endif
return TRUE;
}
if (NOT(dd_mval_exists(n,dir))) return FALSE;
while (right) {
if (dd_mval_exists(right,dir)) {
return (dd_mval(n,dir) > dd_mval(right,dir));
}
right = dd_right(view,right);
}
return FALSE;
}
static void shift_right(ddview_t *view, Agnode_t *n)
{
dd_exchange(view,n,dd_right(view,n));
}
static void reset_coord(ddview_t *view, Agnode_t *n)
{
Agnode_t *L,*R;
double x;
L = dd_left(view,n);
R = dd_right(view,n);
x = dd_coord_between(view,L,R);
dd_set_x(n,x);
}
double dd_coord_between(ddview_t *view, Agnode_t *L, Agnode_t *R)
{
double lx, rx, x;
if (L || R) {
lx = (L ? dd_pos(L).x : dd_pos(R).x - 2.0 * dd_uv_sep(view,NILnode,R));
rx = (R ? dd_pos(R).x : dd_pos(L).x + 2.0 * dd_uv_sep(view,L,NILnode));
x = (lx + rx) / 2.0;
}
else x = 0.0;
return x;
}
void dd_opt_elt(ddview_t *view, Agnode_t *n, int dir, int eq_pass)
{
if (leftgoing(view,n,dir,eq_pass))
{ do shift_left(view,n); while (leftgoing(view,n,dir,eq_pass)); }
else if (rightgoing(view,n,dir,eq_pass))
{ do shift_right(view,n); while (rightgoing(view,n,dir,eq_pass)); }
reset_coord(view,n);
}
/* return new coordinate if node were installed in given rank */
double dd_place_and_reopt(ddview_t *view, Agnode_t *n, int r, double x)
{
Agnode_t *ln,*rn;
ilbool go_left,go_right;
int oldrank,dir;
oldrank = dd_rank(n);
if (dd_node_in_config(n)) {
dd_rank_delete(view,n);
}
dd_install_at_pos(view,n,r,x);
dir = (oldrank < r)? UP : DOWN;
dir = (oldrank < r)? DOWN : UP;
/* set median of n as if it were a leaf from original place of n */
dd_set_mval(n,(double)dd_order(n),dir);
/* go left or right */
go_left = leftgoing(view,n,dir,FALSE);
go_right = rightgoing(view,n,dir,FALSE);
if (go_left && NOT(go_right)) {
rn = dd_right(view,n);
for (ln = dd_left(view,n); ln; ln = dd_left(view,ln)) {
if (dd_mval_exists(ln,dir)) {
if (dd_mval(ln,dir) <= dd_mval(n,dir)) break;
}
else rn = ln;
}
}
else if (go_right && NOT(go_left)) {
ln = dd_left(view,n);
for (rn = dd_right(view,n); rn; rn = dd_right(view,rn)) {
if (dd_mval_exists(rn,dir)) {
if (dd_mval(rn,dir) >= dd_mval(n,dir)) break;
}
else ln = rn;
}
}
else { /* it's frozen in place */
ln = dd_left(view,n);
rn = dd_right(view,n);
}
if ((ln && (x <= dd_pos(ln).x)) || (rn && (x >= dd_pos(rn).x)))
x = dd_coord_between(view,ln,rn);
return x;
}
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