From a05187e45953c309c431d23ca734d62be88269e7 Mon Sep 17 00:00:00 2001
From: cilix42 <cilix42@users.sourceforge.net>
Date: Sat, 12 Jan 2008 01:37:41 +0000
Subject: [PATCH] Allow conversion of all selected items to guides (for items
 other than rectangles or 3D boxes these are simply aligned along the bounding
 box of the item being converted)

---
 src/selection-chemistry.cpp | 38 ++++++++++++++++++++-----------------
 src/sp-item.cpp             | 25 ++++++++++++++++++++++++
 src/sp-item.h               |  2 ++
 3 files changed, 48 insertions(+), 17 deletions(-)

diff --git a/src/selection-chemistry.cpp b/src/selection-chemistry.cpp
index fc2a6a271..b1a579d8b 100644
--- a/src/selection-chemistry.cpp
+++ b/src/selection-chemistry.cpp
@@ -2442,6 +2442,20 @@ void sp_selection_to_marker(bool apply)
                       _("Objects to marker"));
 }
 
+static void sp_selection_to_guides_recursive(SPItem *item) {
+    if (SP_IS_RECT(item)) {
+        sp_rect_convert_to_guides(SP_RECT(item), false);
+    } else if (SP_IS_BOX3D(item)) {
+        box3d_convert_to_guides(SP_BOX3D(item), false);
+    } else if (SP_IS_GROUP(item)) {
+        for (GSList *i = sp_item_group_item_list (SP_GROUP(item)); i != NULL; i = i->next) {
+            sp_selection_to_guides_recursive(SP_ITEM(i->data));
+        }
+    } else {
+        sp_item_convert_to_guides(item);
+    }
+}
+
 void sp_selection_to_guides()
 {
     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
@@ -2452,27 +2466,17 @@ void sp_selection_to_guides()
     Inkscape::Selection *selection = sp_desktop_selection(desktop);
     // we need to copy the list because it gets reset when objects are deleted
     GSList *items = g_slist_copy((GSList *) selection->itemList());
- 
-    bool performed = false;
-    for (GSList const *i = items; i != NULL; i = i->next) {
-        if (SP_IS_RECT(i->data)) {
-            sp_rect_convert_to_guides(SP_RECT(i->data), false);
-            performed = true;
-        } else if (SP_IS_BOX3D(i->data)) {
-            box3d_convert_to_guides(SP_BOX3D(i->data), false);
-            performed = true;
-        }
-    }
 
-    if (!performed) {
-        desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to convert to guides (selection must contain at least one rectangle or 3D box)."));
+    if (!items) {
+        desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to convert to guides."));
         return;
     }
-
-    if (performed) {
-        sp_document_done (doc, SP_VERB_EDIT_SELECTION_2_GUIDES,
-                          _("Objects to guides"));
+ 
+    for (GSList const *i = items; i != NULL; i = i->next) {
+        sp_selection_to_guides_recursive(SP_ITEM(i->data));
     }
+
+    sp_document_done (doc, SP_VERB_EDIT_SELECTION_2_GUIDES, _("Objects to guides"));
 }
 
 void
diff --git a/src/sp-item.cpp b/src/sp-item.cpp
index 3b9d70504..f24bf6ecc 100644
--- a/src/sp-item.cpp
+++ b/src/sp-item.cpp
@@ -51,6 +51,7 @@
 #include "conn-avoid-ref.h"
 #include "conditions.h"
 #include "sp-filter-reference.h"
+#include "sp-guide.h"
 
 #include "libnr/nr-matrix-div.h"
 #include "libnr/nr-matrix-fns.h"
@@ -1576,6 +1577,30 @@ sp_item_first_item_child (SPObject *obj)
     return NULL;
 }
 
+void
+sp_item_convert_to_guides(SPItem *item) {
+    NR::Maybe<NR::Rect> bbox = sp_item_bbox_desktop(item, SPItem::GEOMETRIC_BBOX);
+    if (!bbox) {
+        g_print ("Cannot determine bounding box. Doing nothing.\n");
+        return;
+    }
+
+    std::list<std::pair<Geom::Point, Geom::Point> > pts;
+
+    NR::Point A((*bbox).min());
+    NR::Point C((*bbox).max());
+    NR::Point B(A[NR::X], C[NR::Y]);
+    NR::Point D(C[NR::X], A[NR::Y]);
+
+    pts.push_back(std::make_pair(A.to_2geom(), B.to_2geom()));
+    pts.push_back(std::make_pair(B.to_2geom(), C.to_2geom()));
+    pts.push_back(std::make_pair(C.to_2geom(), D.to_2geom()));
+    pts.push_back(std::make_pair(D.to_2geom(), A.to_2geom()));
+
+    sp_guide_pt_pairs_to_guides(SP_OBJECT_DOCUMENT(item), pts);
+        
+    SP_OBJECT(item)->deleteObject(true);
+}
 
 /*
   Local Variables:
diff --git a/src/sp-item.h b/src/sp-item.h
index e87554bfb..8816bd387 100644
--- a/src/sp-item.h
+++ b/src/sp-item.h
@@ -270,6 +270,8 @@ NR::Matrix sp_item_dt2i_affine(SPItem const *item);
 int sp_item_repr_compare_position(SPItem *first, SPItem *second);
 SPItem *sp_item_first_item_child (SPObject *obj);
 
+void sp_item_convert_to_guides(SPItem *item);
+
 #endif
 
 /*
-- 
2.30.2