src/sp-conn-end.cpp

   1
   2 #include <cstring>
   3 #include <string>
   4
   5 #include "display/curve.h"
   6 #include "libnr/nr-matrix-fns.h"
   7 #include "xml/repr.h"
   8 #include "sp-conn-end.h"
   9 #include "sp-path.h"
  10 #include "uri.h"
  11 #include "document.h"
  12
  13
  14 static void change_endpts(SPCurve *const curve, Geom::Point const h2endPt[2]);
  15 static Geom::Point calc_bbox_conn_pt(Geom::Rect const &bbox, Geom::Point const &p);
  16 static double signed_one(double const x);
  17
  18 SPConnEnd::SPConnEnd(SPObject *const owner) :
  19     ref(owner),
  20     href(NULL),
  21     _changed_connection(),
  22     _delete_connection(),
  23     _transformed_connection()
  24 {
  25 }
  26
  27 static SPObject const *
  28 get_nearest_common_ancestor(SPObject const *const obj, SPItem const *const objs[2]) {
  29     SPObject const *anc_sofar = obj;
  30     for (unsigned i = 0; i < 2; ++i) {
  31         if ( objs[i] != NULL ) {
  32             anc_sofar = anc_sofar->nearestCommonAncestor(objs[i]);
  33         }
  34     }
  35     return anc_sofar;
  36 }
  37
  38 static void
  39 sp_conn_end_move_compensate(Geom::Matrix const */*mp*/, SPItem */*moved_item*/,
  40                             SPPath *const path,
  41                             bool const updatePathRepr = true)
  42 {
  43     // TODO: SPItem::getBounds gives the wrong result for some objects
  44     //       that have internal representations that are updated later
  45     //       by the sp_*_update functions, e.g., text.
  46     sp_document_ensure_up_to_date(path->document);
  47
  48     // Get the new route around obstacles.
  49     path->connEndPair.reroutePath();
  50
  51     SPItem *h2attItem[2];
  52     path->connEndPair.getAttachedItems(h2attItem);
  53     if ( !h2attItem[0] && !h2attItem[1] ) {
  54         if (updatePathRepr) {
  55             path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
  56             path->updateRepr();
  57         }
  58         return;
  59     }
  60
  61     SPItem const *const path_item = SP_ITEM(path);
  62     SPObject const *const ancestor = get_nearest_common_ancestor(path_item, h2attItem);
  63     Geom::Matrix const path2anc(i2anc_affine(path_item, ancestor));
  64
  65     if (h2attItem[0] != NULL && h2attItem[1] != NULL) {
  66         /* Initial end-points: centre of attached object. */
  67         Geom::Point h2endPt_icoordsys[2];
  68         Geom::Matrix h2i2anc[2];
  69         Geom::Rect h2bbox_icoordsys[2];
  70         Geom::Point last_seg_endPt[2] = {
  71             *(path->curve->second_point()),
  72             *(path->curve->penultimate_point())
  73         };
  74         for (unsigned h = 0; h < 2; ++h) {
  75             Geom::OptRect bbox = h2attItem[h]->getBounds(Geom::identity());
  76             if (!bbox) {
  77                 if (updatePathRepr) {
  78                     path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
  79                     path->updateRepr();
  80                 }
  81                 return;
  82             }
  83             h2bbox_icoordsys[h] = *bbox;
  84             h2i2anc[h] = i2anc_affine(h2attItem[h], ancestor);
  85             h2endPt_icoordsys[h] = h2bbox_icoordsys[h].midpoint();
  86         }
  87
  88         // For each attached object, change the corresponding point to be
  89         // on the edge of the bbox.
  90         Geom::Point h2endPt_pcoordsys[2];
  91         for (unsigned h = 0; h < 2; ++h) {
  92             h2endPt_icoordsys[h] = calc_bbox_conn_pt(h2bbox_icoordsys[h],
  93                                          ( last_seg_endPt[h] * h2i2anc[h].inverse() ));
  94             h2endPt_pcoordsys[h] = h2endPt_icoordsys[h] * h2i2anc[h] * path2anc.inverse();
  95         }
  96         change_endpts(path->curve, h2endPt_pcoordsys);
  97     } else {
  98         // We leave the unattached endpoint where it is, and adjust the
  99         // position of the attached endpoint to be on the edge of the bbox.
 100         unsigned ind;
 101         Geom::Point other_endpt;
 102         Geom::Point last_seg_pt;
 103         if (h2attItem[0] != NULL) {
 104             other_endpt = *(path->curve->last_point());
 105             last_seg_pt = *(path->curve->second_point());
 106             ind = 0;
 107         }
 108         else {
 109             other_endpt = *(path->curve->first_point());
 110             last_seg_pt = *(path->curve->penultimate_point());
 111             ind = 1;
 112         }
 113         Geom::Point h2endPt_icoordsys[2];
 114         Geom::Matrix h2i2anc;
 115
 116         Geom::Rect otherpt_rect = Geom::Rect(other_endpt, other_endpt);
 117         Geom::Rect h2bbox_icoordsys[2] = { otherpt_rect, otherpt_rect };
 118         Geom::OptRect bbox = h2attItem[ind]->getBounds(Geom::identity());
 119         if (!bbox) {
 120             if (updatePathRepr) {
 121                 path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 122                 path->updateRepr();
 123             }
 124             return;
 125         }
 126
 127         h2bbox_icoordsys[ind] = *bbox;
 128         h2i2anc = i2anc_affine(h2attItem[ind], ancestor);
 129         h2endPt_icoordsys[ind] = h2bbox_icoordsys[ind].midpoint();
 130
 131         h2endPt_icoordsys[!ind] = other_endpt;
 132
 133         // For the attached object, change the corresponding point to be
 134         // on the edge of the bbox.
 135         Geom::Point h2endPt_pcoordsys[2];
 136         h2endPt_icoordsys[ind] = calc_bbox_conn_pt(h2bbox_icoordsys[ind],
 137                                                  ( last_seg_pt * h2i2anc.inverse() ));
 138         h2endPt_pcoordsys[ind] = h2endPt_icoordsys[ind] * h2i2anc * path2anc.inverse();
 139
 140         // Leave the other where it is.
 141         h2endPt_pcoordsys[!ind] = other_endpt;
 142
 143         change_endpts(path->curve, h2endPt_pcoordsys);
 144     }
 145     if (updatePathRepr) {
 146         path->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
 147         path->updateRepr();
 148     }
 149 }
 150
 151 // TODO: This triggering of makeInvalidPath could be cleaned up to be
 152 //       another option passed to move_compensate.
 153 static void
 154 sp_conn_end_shape_move_compensate(Geom::Matrix const *mp, SPItem *moved_item,
 155                             SPPath *const path)
 156 {
 157     if (path->connEndPair.isAutoRoutingConn()) {
 158         path->connEndPair.makePathInvalid();
 159     }
 160     sp_conn_end_move_compensate(mp, moved_item, path);
 161 }
 162
 163
 164 void
 165 sp_conn_adjust_invalid_path(SPPath *const path)
 166 {
 167     sp_conn_end_move_compensate(NULL, NULL, path);
 168 }
 169
 170 void
 171 sp_conn_adjust_path(SPPath *const path)
 172 {
 173     if (path->connEndPair.isAutoRoutingConn()) {
 174         path->connEndPair.makePathInvalid();
 175     }
 176     // Don't update the path repr or else connector dragging is slowed by
 177     // constant update of values to the xml editor, and each step is also
 178     // needlessly remembered by undo/redo.
 179     bool const updatePathRepr = false;
 180     sp_conn_end_move_compensate(NULL, NULL, path, updatePathRepr);
 181 }
 182
 183 static Geom::Point
 184 calc_bbox_conn_pt(Geom::Rect const &bbox, Geom::Point const &p)
 185 {
 186     using Geom::X;
 187     using Geom::Y;
 188     Geom::Point const ctr(bbox.midpoint());
 189     Geom::Point const lengths(bbox.dimensions());
 190     if ( ctr == p ) {
 191         /* Arbitrarily choose centre of right edge. */
 192         return Geom::Point(ctr[X] + .5 * lengths[X],
 193                          ctr[Y]);
 194     }
 195     Geom::Point const cp( p - ctr );
 196     Geom::Dim2 const edgeDim = ( ( fabs(lengths[Y] * cp[X]) <
 197                                  fabs(lengths[X] * cp[Y])  )
 198                                ? Y
 199                                : X );
 200     Geom::Dim2 const otherDim = (Geom::Dim2) !edgeDim;
 201     Geom::Point offset;
 202     offset[edgeDim] = (signed_one(cp[edgeDim])
 203                        * lengths[edgeDim]);
 204     offset[otherDim] = (lengths[edgeDim]
 205                         * cp[otherDim]
 206                         / fabs(cp[edgeDim]));
 207     g_assert((offset[otherDim] >= 0) == (cp[otherDim] >= 0));
 208 #ifndef NDEBUG
 209     for (unsigned d = 0; d < 2; ++d) {
 210         g_assert(fabs(offset[d]) <= lengths[d] + .125);
 211     }
 212 #endif
 213     return ctr + .5 * offset;
 214 }
 215
 216 static double signed_one(double const x)
 217 {
 218     return (x < 0
 219             ? -1.
 220             : 1.);
 221 }
 222
 223 static void
 224 change_endpts(SPCurve *const curve, Geom::Point const h2endPt[2])
 225 {
 226 #if 0
 227     curve->reset();
 228     curve->moveto(h2endPt[0]);
 229     curve->lineto(h2endPt[1]);
 230 #else
 231     curve->move_endpoints(h2endPt[0], h2endPt[1]);
 232 #endif
 233 }
 234
 235 static void
 236 sp_conn_end_deleted(SPObject *, SPObject *const owner, unsigned const handle_ix)
 237 {
 238     // todo: The first argument is the deleted object, or just NULL if
 239     //       called by sp_conn_end_detach.
 240     g_return_if_fail(handle_ix < 2);
 241     char const *const attr_str[] = {"inkscape:connection-start",
 242                                     "inkscape:connection-end"};
 243     SP_OBJECT_REPR(owner)->setAttribute(attr_str[handle_ix], NULL);
 244     /* I believe this will trigger sp_conn_end_href_changed. */
 245 }
 246
 247 void
 248 sp_conn_end_detach(SPObject *const owner, unsigned const handle_ix)
 249 {
 250     sp_conn_end_deleted(NULL, owner, handle_ix);
 251 }
 252
 253 void
 254 SPConnEnd::setAttacherHref(gchar const *value)
 255 {
 256     if ( value && href && ( strcmp(value, href) == 0 ) ) {
 257         /* No change, do nothing. */
 258     } else {
 259         g_free(href);
 260         href = NULL;
 261         if (value) {
 262             // First, set the href field, because sp_conn_end_href_changed will need it.
 263             href = g_strdup(value);
 264
 265             // Now do the attaching, which emits the changed signal.
 266             try {
 267                 ref.attach(Inkscape::URI(value));
 268             } catch (Inkscape::BadURIException &e) {
 269                 /* TODO: Proper error handling as per
 270                  * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing.  (Also needed for
 271                  * sp-use.) */
 272                 g_warning("%s", e.what());
 273                 ref.detach();
 274             }
 275         } else {
 276             ref.detach();
 277         }
 278     }
 279 }
 280
 281 void
 282 sp_conn_end_href_changed(SPObject */*old_ref*/, SPObject */*ref*/,
 283                          SPConnEnd *connEndPtr, SPPath *const path, unsigned const handle_ix)
 284 {
 285     g_return_if_fail(connEndPtr != NULL);
 286     SPConnEnd &connEnd = *connEndPtr;
 287     connEnd._delete_connection.disconnect();
 288     connEnd._transformed_connection.disconnect();
 289
 290     if (connEnd.href) {
 291         SPObject *refobj = connEnd.ref.getObject();
 292         if (refobj) {
 293             connEnd._delete_connection
 294                 = SP_OBJECT(refobj)->connectDelete(sigc::bind(sigc::ptr_fun(&sp_conn_end_deleted),
 295                                                               SP_OBJECT(path), handle_ix));
 296             connEnd._transformed_connection
 297                 = SP_ITEM(refobj)->connectTransformed(sigc::bind(sigc::ptr_fun(&sp_conn_end_shape_move_compensate),
 298                                                                  path));
 299         }
 300     }
 301 }
 302
 303
 304
 305 /*
 306   Local Variables:
 307   mode:c++
 308   c-file-style:"stroustrup"
 309   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 310   indent-tabs-mode:nil
 311   fill-column:99
 312   End:
 313 */
 314 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :