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/** \file
* Interface between Inkscape code (SPItem) and graphlayout functions.
*/
/*
* Authors:
* Tim Dwyer <tgdwyer@gmail.com>
*
* Copyright (C) 2005 Authors
*
* Released under GNU GPL. Read the file 'COPYING' for more information.
*/
#include <iostream>
#include <config.h>
#include <map>
#include <vector>
#include <algorithm>
#include <float.h>
#include "util/glib-list-iterators.h"
#include "graphlayout/graphlayout.h"
#include "sp-path.h"
#include "sp-item.h"
#include "sp-item-transform.h"
#include "sp-conn-end-pair.h"
#include "conn-avoid-ref.h"
#include "libavoid/connector.h"
#include "libavoid/geomtypes.h"
#include "libcola/cola.h"
#include "libvpsc/generate-constraints.h"
#include "prefs-utils.h"
using namespace std;
using namespace cola;
/**
* Returns true if item is a connector
*/
bool isConnector(SPItem const *const i) {
SPPath *path = NULL;
if(SP_IS_PATH(i)) {
path = SP_PATH(i);
}
return path && path->connEndPair.isAutoRoutingConn();
}
/**
* Scans the items list and places those items that are
* not connectors in filtered
*/
void filterConnectors(GSList const *const items, list<SPItem *> &filtered) {
for(GSList *i=(GSList *)items; i!=NULL; i=i->next) {
SPItem *item=SP_ITEM(i->data);
if(!isConnector(item)) {
filtered.push_back(item);
}
}
}
/**
* Takes a list of inkscape items, extracts the graph defined by
* connectors between them, and uses graph layout techniques to find
* a nice layout
*/
void graphlayout(GSList const *const items) {
if(!items) {
return;
}
using Inkscape::Util::GSListConstIterator;
list<SPItem *> selected;
filterConnectors(items,selected);
if (selected.empty()) return;
const unsigned n=selected.size();
//Check 2 or more selected objects
if (n < 2) return;
double minX=DBL_MAX, minY=DBL_MAX, maxX=-DBL_MAX, maxY=-DBL_MAX;
map<string,unsigned> nodelookup;
vector<Rectangle*> rs;
vector<Edge> es;
for (list<SPItem *>::iterator i(selected.begin());
i != selected.end();
++i)
{
SPItem *u=*i;
NR::Rect const item_box(sp_item_bbox_desktop(u));
NR::Point ll(item_box.min());
NR::Point ur(item_box.max());
minX=min(ll[0],minX); minY=min(ll[1],minY);
maxX=max(ur[0],maxX); maxY=max(ur[1],maxY);
nodelookup[u->id]=rs.size();
rs.push_back(new Rectangle(ll[0],ur[0],ll[1],ur[1]));
}
for (list<SPItem *>::iterator i(selected.begin());
i != selected.end();
++i)
{
SPItem *iu=*i;
unsigned u=nodelookup[iu->id];
GSList *nlist=iu->avoidRef->getAttachedShapes(Avoid::runningFrom);
list<SPItem *> neighbours;
neighbours.insert<GSListConstIterator<SPItem *> >(neighbours.end(),nlist,NULL);
for (list<SPItem *>::iterator j(neighbours.begin());
j != neighbours.end();
++j) {
SPItem *iv=*j;
// What do we do if iv not in nodelookup?!?!
unsigned v=nodelookup[iv->id];
es.push_back(make_pair(u,v));
}
if(nlist) {
g_slist_free(nlist);
}
}
double width=maxX-minX;
double height=maxY-minY;
const unsigned E = es.size();
double eweights[E];
fill(eweights,eweights+E,1);
ConstrainedMajorizationLayout alg(rs,es,eweights,
prefs_get_double_attribute("tools.connector","length",100));
gchar const *directed = NULL, *overlaps = NULL;
directed = prefs_get_string_attribute("tools.connector",
"directedlayout");
overlaps = prefs_get_string_attribute("tools.connector",
"avoidoverlaplayout");
bool avoid_overlaps = false;
if (directed && !strcmp(directed, "true")) {
cout << "Directed layout requested, but not yet implemented\n";
cout << " because we haven't coded cyclic removal alg...\n";
}
if (overlaps && !strcmp(overlaps, "true")) {
cout << "Avoid overlaps requested.\n";
avoid_overlaps = true;
}
alg.setupConstraints(NULL,NULL,avoid_overlaps,
NULL,NULL,NULL,NULL,NULL,NULL);
alg.run();
for (list<SPItem *>::iterator it(selected.begin());
it != selected.end();
++it)
{
SPItem *u=*it;
if(!isConnector(u)) {
Rectangle* r=rs[nodelookup[u->id]];
NR::Rect const item_box(sp_item_bbox_desktop(u));
NR::Point const curr(item_box.midpoint());
NR::Point const dest(r->getCentreX(),r->getCentreY());
sp_item_move_rel(u, NR::translate(dest - curr));
}
}
}
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