From d7854225a939fde4e41907b4f2361e4472a999a7 Mon Sep 17 00:00:00 2001
From: buliabyak <buliabyak@users.sourceforge.net>
Date: Wed, 6 Aug 2008 05:24:29 +0000
Subject: [PATCH] add flashing line from clone to original on Shift+D

---
 src/preferences-skeleton.h  |  1 +
 src/selection-chemistry.cpp | 25 +++++++++++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/preferences-skeleton.h b/src/preferences-skeleton.h
index 2fb29ac60..1b9561ace 100644
--- a/src/preferences-skeleton.h
+++ b/src/preferences-skeleton.h
@@ -190,6 +190,7 @@ static char const preferences_skeleton[] =
 "  </group>\n"
 "\n"
 "  <group id=\"options\">\n"
+"    <group id=\"highlightoriginal\" value=\"1\" />"
 "    <group id=\"relinkclonesonduplicate\" value=\"0\" />"
 "    <group id=\"mapalt\" value=\"1\" />"
 "    <group id=\"switchonextinput\" value=\"0\" />"
diff --git a/src/selection-chemistry.cpp b/src/selection-chemistry.cpp
index 763cffa11..435deea5c 100644
--- a/src/selection-chemistry.cpp
+++ b/src/selection-chemistry.cpp
@@ -83,6 +83,8 @@
 #include "gradient-drag.h"
 #include "uri-references.h"
 #include "libnr/nr-convert2geom.h"
+#include "display/curve.h"
+#include "display/canvas-bpath.h"
 
 // For clippath editing
 #include "tools-switch.h"
@@ -287,12 +289,12 @@ void sp_selection_duplicate(bool suppressDone)
 
         g_assert (old_ids.size() == new_ids.size());
 
-        for(int i = 0; i < old_ids.size(); i++) {
+        for(unsigned int i = 0; i < old_ids.size(); i++) {
             const gchar *id = old_ids[i];
             SPObject *old_clone = doc->getObjectById(id);
             if (SP_IS_USE(old_clone)) {
                 SPItem *orig = sp_use_get_original(SP_USE(old_clone));
-                for(int j = 0; j < old_ids.size(); j++) {
+                for(unsigned int j = 0; j < old_ids.size(); j++) {
                     if (!strcmp(SP_OBJECT_ID(orig), old_ids[j])) {
                         // we have both orig and clone in selection, relink
                         // std::cout << id  << " old, its ori: " << SP_OBJECT_ID(orig) << "; will relink:" << new_ids[i] << " to " << new_ids[j] << "\n";
@@ -2079,6 +2081,25 @@ sp_select_clone_original()
     }
 
     if (original) {
+
+        bool highlight = prefs_get_int_attribute ("options.highlightoriginal", "value", 0);
+        if (highlight) {
+            boost::optional<NR::Rect> a = item->getBounds(from_2geom(sp_item_i2d_affine(item)));
+            boost::optional<NR::Rect> b = original->getBounds(from_2geom(sp_item_i2d_affine(original)));
+            if ( a && b ) {
+                // draw a flashing line between the objects
+                SPCurve *curve = new SPCurve();
+                curve->moveto(a->midpoint());
+                curve->lineto(b->midpoint());
+
+                SPCanvasItem * canvasitem = sp_canvas_bpath_new(sp_desktop_tempgroup(desktop), curve);
+                sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(canvasitem), 0x0000ddff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT, 5, 3);
+                sp_canvas_item_show(canvasitem);
+                curve->unref();
+                desktop->add_temporary_canvasitem (canvasitem, 1000);
+            }
+        }
+
         selection->clear();
         selection->set(original);
         if (SP_CYCLING == SP_CYCLE_FOCUS) {
-- 
2.30.2