2 #include "display/curve.h"
3 #include "libnr/nr-matrix-div.h"
4 #include "libnr/nr-matrix-fns.h"
5 #include "xml/repr.h"
6 #include "sp-conn-end.h"
7 #include "sp-path.h"
8 #include "uri.h"
9 #include "document.h"
12 static void change_endpts(SPCurve *const curve, NR::Point const h2endPt[2]);
13 static NR::Point calc_bbox_conn_pt(NR::Rect const &bbox, NR::Point const &p);
14 static double signed_one(double const x);
16 SPConnEnd::SPConnEnd(SPObject *const owner) :
17 ref(owner),
18 href(NULL),
19 _changed_connection(),
20 _delete_connection(),
21 _transformed_connection()
22 {
23 }
25 static SPObject const *
26 get_nearest_common_ancestor(SPObject const *const obj, SPItem const *const objs[2]) {
27 SPObject const *anc_sofar = obj;
28 for (unsigned i = 0; i < 2; ++i) {
29 if ( objs[i] != NULL ) {
30 anc_sofar = anc_sofar->nearestCommonAncestor(objs[i]);
31 }
32 }
33 return anc_sofar;
34 }
36 static void
37 sp_conn_end_move_compensate(NR::Matrix const *mp, SPItem *moved_item,
38 SPPath *const path,
39 bool const updatePathRepr = true)
40 {
41 // TODO: SPItem::invokeBbox gives the wrong result for some objects
42 // that have internal representations that are updated later
43 // by the sp_*_update functions, e.g., text.
44 sp_document_ensure_up_to_date(path->document);
46 // Get the new route around obstacles.
47 path->connEndPair.reroutePath();
49 SPItem *h2attItem[2];
50 path->connEndPair.getAttachedItems(h2attItem);
51 if ( !h2attItem[0] && !h2attItem[1] ) {
52 if (updatePathRepr) {
53 path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
54 path->updateRepr();
55 }
56 return;
57 }
59 SPItem const *const path_item = SP_ITEM(path);
60 SPObject const *const ancestor = get_nearest_common_ancestor(path_item, h2attItem);
61 NR::Matrix const path2anc(i2anc_affine(path_item, ancestor));
63 if (h2attItem[0] != NULL && h2attItem[1] != NULL) {
64 /* Initial end-points: centre of attached object. */
65 NR::Point h2endPt_icoordsys[2];
66 NR::Matrix h2i2anc[2];
67 NR::Rect h2bbox_icoordsys[2] = {
68 h2attItem[0]->invokeBbox(NR::identity()),
69 h2attItem[1]->invokeBbox(NR::identity())
70 };
71 NR::Point last_seg_endPt[2] = {
72 sp_curve_second_point(path->curve),
73 sp_curve_penultimate_point(path->curve)
74 };
75 for (unsigned h = 0; h < 2; ++h) {
76 h2i2anc[h] = i2anc_affine(h2attItem[h], ancestor);
77 h2endPt_icoordsys[h] = h2bbox_icoordsys[h].midpoint();
78 }
80 // For each attached object, change the corresponding point to be
81 // on the edge of the bbox.
82 NR::Point h2endPt_pcoordsys[2];
83 for (unsigned h = 0; h < 2; ++h) {
84 h2endPt_icoordsys[h] = calc_bbox_conn_pt(h2bbox_icoordsys[h],
85 ( last_seg_endPt[h] / h2i2anc[h] ));
86 h2endPt_pcoordsys[h] = h2endPt_icoordsys[h] * h2i2anc[h] / path2anc;
87 }
88 change_endpts(path->curve, h2endPt_pcoordsys);
89 } else {
90 // We leave the unattached endpoint where it is, and adjust the
91 // position of the attached endpoint to be on the edge of the bbox.
92 unsigned ind;
93 NR::Point other_endpt;
94 NR::Point last_seg_pt;
95 if (h2attItem[0] != NULL) {
96 other_endpt = sp_curve_last_point(path->curve);
97 last_seg_pt = sp_curve_second_point(path->curve);
98 ind = 0;
99 }
100 else {
101 other_endpt = sp_curve_first_point(path->curve);
102 last_seg_pt = sp_curve_penultimate_point(path->curve);
103 ind = 1;
104 }
105 NR::Point h2endPt_icoordsys[2];
106 NR::Matrix h2i2anc;
108 NR::Rect otherpt_rect = NR::Rect(other_endpt, other_endpt);
109 NR::Rect h2bbox_icoordsys[2] = { otherpt_rect, otherpt_rect };
110 h2bbox_icoordsys[ind] = h2attItem[ind]->invokeBbox(NR::identity());
112 h2i2anc = i2anc_affine(h2attItem[ind], ancestor);
113 h2endPt_icoordsys[ind] = h2bbox_icoordsys[ind].midpoint();
115 h2endPt_icoordsys[!ind] = other_endpt;
117 // For the attached object, change the corresponding point to be
118 // on the edge of the bbox.
119 NR::Point h2endPt_pcoordsys[2];
120 h2endPt_icoordsys[ind] = calc_bbox_conn_pt(h2bbox_icoordsys[ind],
121 ( last_seg_pt / h2i2anc ));
122 h2endPt_pcoordsys[ind] = h2endPt_icoordsys[ind] * h2i2anc / path2anc;
124 // Leave the other where it is.
125 h2endPt_pcoordsys[!ind] = other_endpt;
127 change_endpts(path->curve, h2endPt_pcoordsys);
128 }
129 if (updatePathRepr) {
130 path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
131 path->updateRepr();
132 }
133 }
135 // TODO: This triggering of makeInvalidPath could be cleaned up to be
136 // another option passed to move_compensate.
137 static void
138 sp_conn_end_shape_move_compensate(NR::Matrix const *mp, SPItem *moved_item,
139 SPPath *const path)
140 {
141 if (path->connEndPair.isAutoRoutingConn()) {
142 path->connEndPair.makePathInvalid();
143 }
144 sp_conn_end_move_compensate(mp, moved_item, path);
145 }
148 void
149 sp_conn_adjust_invalid_path(SPPath *const path)
150 {
151 sp_conn_end_move_compensate(NULL, NULL, path);
152 }
154 void
155 sp_conn_adjust_path(SPPath *const path)
156 {
157 if (path->connEndPair.isAutoRoutingConn()) {
158 path->connEndPair.makePathInvalid();
159 }
160 // Don't update the path repr or else connector dragging is slowed by
161 // constant update of values to the xml editor, and each step is also
162 // needlessly remembered by undo/redo.
163 bool const updatePathRepr = false;
164 sp_conn_end_move_compensate(NULL, NULL, path, updatePathRepr);
165 }
167 static NR::Point
168 calc_bbox_conn_pt(NR::Rect const &bbox, NR::Point const &p)
169 {
170 using NR::X;
171 using NR::Y;
172 NR::Point const ctr(bbox.midpoint());
173 NR::Point const lengths(bbox.dimensions());
174 if ( ctr == p ) {
175 /* Arbitrarily choose centre of right edge. */
176 return NR::Point(ctr[X] + .5 * lengths[X],
177 ctr[Y]);
178 }
179 NR::Point const cp( p - ctr );
180 NR::Dim2 const edgeDim = ( ( fabs(lengths[Y] * cp[X]) <
181 fabs(lengths[X] * cp[Y]) )
182 ? Y
183 : X );
184 NR::Dim2 const otherDim = (NR::Dim2) !edgeDim;
185 NR::Point offset;
186 offset[edgeDim] = (signed_one(cp[edgeDim])
187 * lengths[edgeDim]);
188 offset[otherDim] = (lengths[edgeDim]
189 * cp[otherDim]
190 / fabs(cp[edgeDim]));
191 g_assert((offset[otherDim] >= 0) == (cp[otherDim] >= 0));
192 #ifndef NDEBUG
193 for (unsigned d = 0; d < 2; ++d) {
194 g_assert(fabs(offset[d]) <= lengths[d] + .125);
195 }
196 #endif
197 return ctr + .5 * offset;
198 }
200 static double signed_one(double const x)
201 {
202 return (x < 0
203 ? -1.
204 : 1.);
205 }
207 static void
208 change_endpts(SPCurve *const curve, NR::Point const h2endPt[2])
209 {
210 #if 0
211 sp_curve_reset(curve);
212 sp_curve_moveto(curve, h2endPt[0]);
213 sp_curve_lineto(curve, h2endPt[1]);
214 #else
215 sp_curve_move_endpoints(curve, h2endPt[0], h2endPt[1]);
216 #endif
217 }
219 static void
220 sp_conn_end_deleted(SPObject *, SPObject *const owner, unsigned const handle_ix)
221 {
222 // todo: The first argument is the deleted object, or just NULL if
223 // called by sp_conn_end_detach.
224 g_return_if_fail(handle_ix < 2);
225 char const *const attr_str[] = {"inkscape:connection-start",
226 "inkscape:connection-end"};
227 SP_OBJECT_REPR(owner)->setAttribute(attr_str[handle_ix], NULL);
228 /* I believe this will trigger sp_conn_end_href_changed. */
229 }
231 void
232 sp_conn_end_detach(SPObject *const owner, unsigned const handle_ix)
233 {
234 sp_conn_end_deleted(NULL, owner, handle_ix);
235 }
237 void
238 SPConnEnd::setAttacherHref(gchar const *value)
239 {
240 if ( value && href && ( strcmp(value, href) == 0 ) ) {
241 /* No change, do nothing. */
242 } else {
243 g_free(href);
244 href = NULL;
245 if (value) {
246 // First, set the href field, because sp_conn_end_href_changed will need it.
247 href = g_strdup(value);
249 // Now do the attaching, which emits the changed signal.
250 try {
251 ref.attach(Inkscape::URI(value));
252 } catch (Inkscape::BadURIException &e) {
253 /* TODO: Proper error handling as per
254 * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing. (Also needed for
255 * sp-use.) */
256 g_warning("%s", e.what());
257 ref.detach();
258 }
259 } else {
260 ref.detach();
261 }
262 }
263 }
265 void
266 sp_conn_end_href_changed(SPObject *old_ref, SPObject *ref,
267 SPConnEnd *connEndPtr, SPPath *const path, unsigned const handle_ix)
268 {
269 g_return_if_fail(connEndPtr != NULL);
270 SPConnEnd &connEnd = *connEndPtr;
271 connEnd._delete_connection.disconnect();
272 connEnd._transformed_connection.disconnect();
274 if (connEnd.href) {
275 SPObject *refobj = connEnd.ref.getObject();
276 if (refobj) {
277 connEnd._delete_connection
278 = SP_OBJECT(refobj)->connectDelete(sigc::bind(sigc::ptr_fun(&sp_conn_end_deleted),
279 SP_OBJECT(path), handle_ix));
280 connEnd._transformed_connection
281 = SP_ITEM(refobj)->connectTransformed(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_move_compensate),
282 path));
283 }
284 }
285 }
289 /*
290 Local Variables:
291 mode:c++
292 c-file-style:"stroustrup"
293 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
294 indent-tabs-mode:nil
295 fill-column:99
296 End:
297 */
298 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :