moving trunk for module inkscape

(bzr r1)

1 files changed, 176 insertions, 0 deletions

diff --git a/src/object-snapper.cpp b/src/object-snapper.cpp
new file mode 100644
index 000000000..6552cea96
--- /dev/null
+++ b/src/object-snapper.cpp
@@ -0,0 +1,176 @@
+/**
+ *  \file object-snapper.cpp
+ *  \brief Snapping things to objects.
+ *
+ * Authors:
+ *   Carl Hetherington <inkscape@carlh.net>
+ *
+ * Copyright (C) 2005 Authors 
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "libnr/n-art-bpath.h"
+#include "libnr/nr-rect-ops.h"
+#include "document.h"
+#include "sp-namedview.h"
+#include "sp-path.h"
+#include "display/curve.h"
+#include "desktop.h"
+#include "inkscape.h"
+#include "splivarot.h"
+
+
+Inkscape::ObjectSnapper::ObjectSnapper(SPNamedView const *nv, NR::Coord const d)
+    : Snapper(nv, d), _snap_to_nodes(true), _snap_to_paths(true)
+{
+    
+}
+
+
+/**
+ *  \param p Point we are trying to snap (desktop coordinates)
+ */
+
+void Inkscape::ObjectSnapper::_findCandidates(std::list<SPItem*>& c,
+                                              SPObject* r,
+                                              std::list<SPItem const *> const &it,
+                                              NR::Point const &p) const
+{
+    for (SPObject* o = r->children; o != NULL; o = o->next) {
+        if (SP_IS_ITEM(o)) {
+
+            /* See if this item is on the ignore list */
+            std::list<SPItem const *>::const_iterator i = it.begin();
+            while (i != it.end() && *i != o) {
+                i++;
+            }
+            
+            if (i == it.end()) {
+                /* See if the item is within range */
+                NR::Rect const b = NR::expand(sp_item_bbox_desktop(SP_ITEM(o)), -getDistance());
+                if (b.contains(p)) {
+                    c.push_back(SP_ITEM(o));
+                }
+            }
+        }
+        
+        _findCandidates(c, o, it, p);
+    }
+}
+
+
+void Inkscape::ObjectSnapper::_snapNodes(Inkscape::SnappedPoint &s,
+                                         NR::Point const &p,
+                                         std::list<SPItem*> const &cand) const
+{
+    /* FIXME: this seems like a hack.  Perhaps Snappers should be
+    ** in SPDesktop rather than SPNamedView?
+    */
+    SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
+
+    for (std::list<SPItem*>::const_iterator i = cand.begin(); i != cand.end(); i++) {
+        if (SP_IS_SHAPE(*i)) {
+
+            SPShape const *sh = SP_SHAPE(*i);
+            if (sh->curve) {
+
+                int j = 0;
+                NR::Matrix const i2doc = sp_item_i2doc_affine(*i);
+                
+                while (sh->curve->bpath[j].code != NR_END) {
+
+                    /* Get this node in desktop coordinates */
+                    NArtBpath const &bp = sh->curve->bpath[j];
+                    NR::Point const n = desktop->doc2dt(bp.c(3) * i2doc);
+
+                    /* Try to snap to this node of the path */
+                    NR::Coord const dist = NR::L2(n - p);
+                    if (dist < getDistance() && dist < s.getDistance()) {
+                        s = SnappedPoint(n, dist);
+                    }
+                    
+                    j++;
+                }
+            }
+        }
+    }
+}
+
+
+void Inkscape::ObjectSnapper::_snapPaths(Inkscape::SnappedPoint &s,
+                                         NR::Point const &p,
+                                         std::list<SPItem*> const &cand) const
+{
+    /* FIXME: this seems like a hack.  Perhaps Snappers should be
+    ** in SPDesktop rather than SPNamedView?
+    */
+    SPDesktop const *desktop = SP_ACTIVE_DESKTOP;
+
+    NR::Point const p_doc = desktop->dt2doc(p);
+
+    for (std::list<SPItem*>::const_iterator i = cand.begin(); i != cand.end(); i++) {
+
+        /* Transform the requested snap point to this item's coordinates */
+        NR::Matrix const i2doc = sp_item_i2doc_affine(*i);
+        NR::Point const p_it = p_doc * i2doc.inverse();
+
+        /* Look for the nearest position on this SPItem to our snap point */
+        NR::Maybe<Path::cut_position> const o = get_nearest_position_on_Path(*i, p_it);
+        if (o != NR::Nothing() && o.assume().t >= 0 && o.assume().t <= 1) {
+
+            /* Convert the nearest point back to desktop coordinates */
+            NR::Point const o_it = get_point_on_Path(*i, o.assume().piece, o.assume().t);
+            NR::Point const o_dt = desktop->doc2dt(o_it * i2doc);
+            
+            NR::Coord const dist = NR::L2(o_dt - p);
+            if (dist < getDistance() && dist < s.getDistance()) {
+                s = SnappedPoint(o_dt, dist);
+            }
+        }
+    }
+
+}
+
+
+Inkscape::SnappedPoint Inkscape::ObjectSnapper::_doFreeSnap(NR::Point const &p,
+                                                            std::list<SPItem const *> const &it) const
+{
+    /* Get a list of all the SPItems that we will try to snap to */
+    std::list<SPItem*> cand;
+    _findCandidates(cand, sp_document_root(_named_view->document), it, p);
+
+    SnappedPoint s(p, NR_HUGE);
+
+    if (_snap_to_nodes) {
+        _snapNodes(s, p, cand);
+    }
+    if (_snap_to_paths) {
+        _snapPaths(s, p, cand);
+    }
+
+    return s;
+}
+
+
+
+Inkscape::SnappedPoint Inkscape::ObjectSnapper::_doConstrainedSnap(NR::Point const &p,
+                                                                   NR::Point const &c,
+                                                                   std::list<SPItem const *> const &it) const
+{
+    /* FIXME: this needs implementing properly; I think we have to do the
+    ** intersection of c with the objects.
+    */
+    return _doFreeSnap(p, it);
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :