1 /*
2 * A class for handling shape interaction with libavoid.
3 *
4 * Authors:
5 * Michael Wybrow <mjwybrow@users.sourceforge.net>
6 *
7 * Copyright (C) 2005 Michael Wybrow
8 *
9 * Released under GNU GPL, read the file 'COPYING' for more information
10 */
13 #include <cstring>
14 #include <string>
16 #include "sp-item.h"
17 #include "conn-avoid-ref.h"
18 #include "libavoid/polyutil.h"
19 #include "libavoid/router.h"
20 #include "libavoid/connector.h"
21 #include "xml/node.h"
22 #include "document.h"
23 #include "desktop.h"
24 #include "desktop-handles.h"
25 #include "sp-namedview.h"
26 #include "inkscape.h"
29 using Avoid::Router;
31 static Avoid::Polygn avoid_item_poly(SPItem const *item);
34 SPAvoidRef::SPAvoidRef(SPItem *spitem)
35 : shapeRef(NULL)
36 , item(spitem)
37 , setting(false)
38 , new_setting(false)
39 , _transformed_connection()
40 {
41 }
44 SPAvoidRef::~SPAvoidRef()
45 {
46 _transformed_connection.disconnect();
47 if (shapeRef) {
48 Router *router = shapeRef->router();
49 // shapeRef is finalised by delShape,
50 // so no memory is lost here.
51 router->delShape(shapeRef);
52 shapeRef = NULL;
53 }
54 }
57 void SPAvoidRef::setAvoid(char const *value)
58 {
59 if (SP_OBJECT_IS_CLONED(item)) {
60 // Don't keep avoidance information for cloned objects.
61 return;
62 }
63 new_setting = false;
64 if (value && (strcmp(value, "true") == 0)) {
65 new_setting = true;
66 }
67 }
70 void SPAvoidRef::handleSettingChange(void)
71 {
72 SPDesktop *desktop = inkscape_active_desktop();
73 if (desktop == NULL) {
74 return;
75 }
76 if (sp_desktop_document(desktop) != item->document) {
77 // We don't want to go any further if the active desktop's document
78 // isn't the same as the document that this item is part of. This
79 // case can happen if a new document is loaded from the file chooser
80 // or via the recent file menu. In this case, we can end up here
81 // as a rersult of a sp_document_ensure_up_to_date performed on a
82 // document not yet attached to the active desktop.
83 return;
84 }
86 if (new_setting == setting) {
87 // Don't need to make any changes
88 return;
89 }
90 setting = new_setting;
92 Router *router = item->document->router;
94 _transformed_connection.disconnect();
95 if (new_setting) {
96 Avoid::Polygn poly = avoid_item_poly(item);
97 if (poly.pn > 0) {
98 _transformed_connection = item->connectTransformed(
99 sigc::ptr_fun(&avoid_item_move));
101 const char *id = SP_OBJECT_REPR(item)->attribute("id");
102 g_assert(id != NULL);
104 // Get a unique ID for the item.
105 GQuark itemID = g_quark_from_string(id);
107 shapeRef = new Avoid::ShapeRef(router, itemID, poly);
108 Avoid::freePoly(poly);
110 router->addShape(shapeRef);
111 }
112 }
113 else
114 {
115 g_assert(shapeRef);
117 // shapeRef is finalised by delShape,
118 // so no memory is lost here.
119 router->delShape(shapeRef);
120 shapeRef = NULL;
121 }
122 }
125 GSList *SPAvoidRef::getAttachedShapes(const unsigned int type)
126 {
127 GSList *list = NULL;
129 Avoid::IntList shapes;
130 GQuark shapeId = g_quark_from_string(item->id);
131 item->document->router->attachedShapes(shapes, shapeId, type);
133 Avoid::IntList::iterator finish = shapes.end();
134 for (Avoid::IntList::iterator i = shapes.begin(); i != finish; ++i) {
135 const gchar *connId = g_quark_to_string(*i);
136 SPObject *obj = item->document->getObjectById(connId);
137 if (obj == NULL) {
138 g_warning("getAttachedShapes: Object with id=\"%s\" is not "
139 "found. Skipping.", connId);
140 continue;
141 }
142 SPItem *shapeItem = SP_ITEM(obj);
143 list = g_slist_prepend(list, shapeItem);
144 }
145 return list;
146 }
149 GSList *SPAvoidRef::getAttachedConnectors(const unsigned int type)
150 {
151 GSList *list = NULL;
153 Avoid::IntList conns;
154 GQuark shapeId = g_quark_from_string(item->id);
155 item->document->router->attachedConns(conns, shapeId, type);
157 Avoid::IntList::iterator finish = conns.end();
158 for (Avoid::IntList::iterator i = conns.begin(); i != finish; ++i) {
159 const gchar *connId = g_quark_to_string(*i);
160 SPObject *obj = item->document->getObjectById(connId);
161 if (obj == NULL) {
162 g_warning("getAttachedConnectors: Object with id=\"%s\" is not "
163 "found. Skipping.", connId);
164 continue;
165 }
166 SPItem *connItem = SP_ITEM(obj);
167 list = g_slist_prepend(list, connItem);
168 }
169 return list;
170 }
173 static Avoid::Polygn avoid_item_poly(SPItem const *item)
174 {
175 SPDesktop *desktop = inkscape_active_desktop();
176 g_assert(desktop != NULL);
178 Avoid::Polygn poly;
180 // TODO: The right way to do this is to return the convex hull of
181 // the object, or an approximation in the case of a rounded
182 // object. Specific SPItems will need to have a new
183 // function that returns points for the convex hull.
184 // For some objects it is enough to feed the snappoints to
185 // some convex hull code, though not NR::ConvexHull as this
186 // only keeps the bounding box of the convex hull currently.
188 // TODO: SPItem::getBounds gives the wrong result for some objects
189 // that have internal representations that are updated later
190 // by the sp_*_update functions, e.g., text.
191 sp_document_ensure_up_to_date(item->document);
193 Geom::OptRect rHull = item->getBounds(sp_item_i2doc_affine(item));
194 if (!rHull) {
195 return Avoid::newPoly(0);
196 }
198 double spacing = desktop->namedview->connector_spacing;
200 // Add a little buffer around the edge of each object.
201 Geom::Rect rExpandedHull = *rHull;
202 rExpandedHull.expandBy(spacing);
203 poly = Avoid::newPoly(4);
205 for (unsigned n = 0; n < 4; ++n) {
206 Geom::Point hullPoint = rExpandedHull.corner(n);
207 poly.ps[n].x = hullPoint[Geom::X];
208 poly.ps[n].y = hullPoint[Geom::Y];
209 }
211 return poly;
212 }
215 GSList *get_avoided_items(GSList *list, SPObject *from, SPDesktop *desktop,
216 bool initialised)
217 {
218 for (SPObject *child = sp_object_first_child(SP_OBJECT(from)) ;
219 child != NULL; child = SP_OBJECT_NEXT(child) ) {
220 if (SP_IS_ITEM(child) &&
221 !desktop->isLayer(SP_ITEM(child)) &&
222 !SP_ITEM(child)->isLocked() &&
223 !desktop->itemIsHidden(SP_ITEM(child)) &&
224 (!initialised || SP_ITEM(child)->avoidRef->shapeRef)
225 )
226 {
227 list = g_slist_prepend (list, SP_ITEM(child));
228 }
230 if (SP_IS_ITEM(child) && desktop->isLayer(SP_ITEM(child))) {
231 list = get_avoided_items(list, child, desktop, initialised);
232 }
233 }
235 return list;
236 }
239 void avoid_item_move(Geom::Matrix const */*mp*/, SPItem *moved_item)
240 {
241 Avoid::ShapeRef *shapeRef = moved_item->avoidRef->shapeRef;
242 g_assert(shapeRef);
244 Router *router = moved_item->document->router;
245 Avoid::Polygn poly = avoid_item_poly(moved_item);
246 if (poly.pn > 0) {
247 router->moveShape(shapeRef, &poly);
248 Avoid::freePoly(poly);
249 }
250 }
253 void init_avoided_shape_geometry(SPDesktop *desktop)
254 {
255 // Don't count this as changes to the document,
256 // it is basically just late initialisation.
257 SPDocument *document = sp_desktop_document(desktop);
258 bool saved = sp_document_get_undo_sensitive(document);
259 sp_document_set_undo_sensitive(document, false);
261 bool initialised = false;
262 GSList *items = get_avoided_items(NULL, desktop->currentRoot(), desktop,
263 initialised);
265 for ( GSList const *iter = items ; iter != NULL ; iter = iter->next ) {
266 SPItem *item = reinterpret_cast<SPItem *>(iter->data);
267 item->avoidRef->handleSettingChange();
268 }
270 if (items) {
271 g_slist_free(items);
272 }
273 sp_document_set_undo_sensitive(document, saved);
274 }
277 /*
278 Local Variables:
279 mode:c++
280 c-file-style:"stroustrup"
281 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
282 indent-tabs-mode:nil
283 fill-column:99
284 End:
285 */
286 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :