1 /** \file
2 * Interface between Inkscape code (SPItem) and graphlayout functions.
3 */
4 /*
5 * Authors:
6 * Tim Dwyer <Tim.Dwyer@infotech.monash.edu.au>
7 *
8 * Copyright (C) 2005 Authors
9 *
10 * Released under GNU GPL. Read the file 'COPYING' for more information.
11 */
12 #include <iostream>
13 #include <config.h>
14 #include <map>
15 #include <vector>
16 #include <algorithm>
17 #include <float.h>
19 #include "desktop.h"
20 #include "inkscape.h"
21 #include "sp-namedview.h"
22 #include "util/glib-list-iterators.h"
23 #include "graphlayout/graphlayout.h"
24 #include "sp-path.h"
25 #include "sp-item.h"
26 #include "sp-item-transform.h"
27 #include "sp-conn-end-pair.h"
28 #include "style.h"
29 #include "conn-avoid-ref.h"
30 #include "libavoid/connector.h"
31 #include "libavoid/geomtypes.h"
32 #include "libcola/cola.h"
33 #include "libvpsc/generate-constraints.h"
34 #include "prefs-utils.h"
36 using namespace std;
37 using namespace cola;
38 using namespace vpsc;
40 /**
41 * Returns true if item is a connector
42 */
43 bool isConnector(SPItem const *const i) {
44 SPPath *path = NULL;
45 if(SP_IS_PATH(i)) {
46 path = SP_PATH(i);
47 }
48 return path && path->connEndPair.isAutoRoutingConn();
49 }
51 /**
52 * Scans the items list and places those items that are
53 * not connectors in filtered
54 */
55 void filterConnectors(GSList const *const items, list<SPItem *> &filtered) {
56 for(GSList *i=(GSList *)items; i!=NULL; i=i->next) {
57 SPItem *item=SP_ITEM(i->data);
58 if(!isConnector(item)) {
59 filtered.push_back(item);
60 }
61 }
62 }
63 /**
64 * Takes a list of inkscape items, extracts the graph defined by
65 * connectors between them, and uses graph layout techniques to find
66 * a nice layout
67 */
68 void graphlayout(GSList const *const items) {
69 if(!items) {
70 return;
71 }
73 using Inkscape::Util::GSListConstIterator;
74 list<SPItem *> selected;
75 filterConnectors(items,selected);
76 if (selected.empty()) return;
78 const unsigned n=selected.size();
79 //Check 2 or more selected objects
80 if (n < 2) return;
82 // add the connector spacing to the size of node bounding boxes
83 // so that connectors can always be routed between shapes
84 SPDesktop* desktop = inkscape_active_desktop();
85 double spacing = 0;
86 if(desktop) spacing = desktop->namedview->connector_spacing+0.1;
88 map<string,unsigned> nodelookup;
89 vector<Rectangle*> rs;
90 vector<Edge> es;
91 for (list<SPItem *>::iterator i(selected.begin());
92 i != selected.end();
93 ++i)
94 {
95 SPItem *u=*i;
96 NR::Rect const item_box(sp_item_bbox_desktop(u));
97 NR::Point ll(item_box.min());
98 NR::Point ur(item_box.max());
99 nodelookup[u->id]=rs.size();
100 rs.push_back(new Rectangle(ll[0]-spacing,ur[0]+spacing,
101 ll[1]-spacing,ur[1]+spacing));
102 }
104 SimpleConstraints scx,scy;
105 double ideal_connector_length = prefs_get_double_attribute("tools.connector","length",100);
106 double directed_edge_height_modifier = 1.0;
107 gchar const *directed_str = NULL, *overlaps_str = NULL;
108 directed_str = prefs_get_string_attribute("tools.connector",
109 "directedlayout");
110 overlaps_str = prefs_get_string_attribute("tools.connector",
111 "avoidoverlaplayout");
112 bool avoid_overlaps = false;
113 bool directed = false;
114 if (directed_str && !strcmp(directed_str, "true")) {
115 directed = true;
116 }
117 if (overlaps_str && !strcmp(overlaps_str, "true")) {
118 avoid_overlaps = true;
119 }
121 for (list<SPItem *>::iterator i(selected.begin());
122 i != selected.end();
123 ++i)
124 {
125 SPItem *iu=*i;
126 unsigned u=nodelookup[iu->id];
127 GSList *nlist=iu->avoidRef->getAttachedConnectors(Avoid::runningFrom);
128 list<SPItem *> connectors;
130 connectors.insert<GSListConstIterator<SPItem *> >(connectors.end(),nlist,NULL);
131 for (list<SPItem *>::iterator j(connectors.begin());
132 j != connectors.end();
133 ++j) {
134 SPItem *conn=*j;
135 SPItem *iv;
136 SPItem *items[2];
137 assert(isConnector(conn));
138 SP_PATH(conn)->connEndPair.getAttachedItems(items);
139 if(items[0]==iu) {
140 iv=items[1];
141 } else {
142 iv=items[0];
143 }
145 if (iv == NULL) {
146 // The connector is not attached to anything at the
147 // other end so we should just ignore it.
148 continue;
149 }
151 // What do we do if iv not in nodelookup?!?!
152 map<string,unsigned>::iterator v_pair=nodelookup.find(iv->id);
153 if(v_pair!=nodelookup.end()) {
154 unsigned v=v_pair->second;
155 //cout << "Edge: (" << u <<","<<v<<")"<<endl;
156 es.push_back(make_pair(u,v));
157 if(conn->style->marker[SP_MARKER_LOC_END].set) {
158 if(directed && strcmp(conn->style->marker[SP_MARKER_LOC_END].value,"none")) {
159 scy.push_back(new SimpleConstraint(v, u,
160 (ideal_connector_length * directed_edge_height_modifier)));
161 }
162 }
163 }
164 }
165 if(nlist) {
166 g_slist_free(nlist);
167 }
168 }
169 const unsigned E = es.size();
170 double eweights[E];
171 fill(eweights,eweights+E,1);
172 vector<Component*> cs;
173 connectedComponents(rs,es,scx,scy,cs);
174 for(unsigned i=0;i<cs.size();i++) {
175 Component* c=cs[i];
176 if(c->edges.size()<2) continue;
177 ConstrainedMajorizationLayout alg(c->rects,c->edges,eweights,ideal_connector_length);
178 alg.setupConstraints(NULL,NULL,avoid_overlaps,
179 NULL,NULL,&c->scx,&c->scy,NULL,NULL);
180 alg.run();
181 }
182 separateComponents(cs);
184 for (list<SPItem *>::iterator it(selected.begin());
185 it != selected.end();
186 ++it)
187 {
188 SPItem *u=*it;
189 if(!isConnector(u)) {
190 Rectangle* r=rs[nodelookup[u->id]];
191 NR::Rect const item_box(sp_item_bbox_desktop(u));
192 NR::Point const curr(item_box.midpoint());
193 NR::Point const dest(r->getCentreX(),r->getCentreY());
194 sp_item_move_rel(u, NR::translate(dest - curr));
195 }
196 }
197 for(unsigned i=0;i<scx.size();i++) {
198 delete scx[i];
199 }
200 for(unsigned i=0;i<scy.size();i++) {
201 delete scy[i];
202 }
203 for(unsigned i=0;i<rs.size();i++) {
204 delete rs[i];
205 }
206 }
207 // vim: set cindent
208 // vim: ts=4 sw=4 et tw=0 wm=0