merge mirror improvements

(bzr r15295.1.41)

12 files changed, 929 insertions, 29 deletions

diff --git a/src/live_effects/CMakeLists.txt b/src/live_effects/CMakeLists.txt
index 784317090..5ffccc7c0 100644
--- a/src/live_effects/CMakeLists.txt
+++ b/src/live_effects/CMakeLists.txt
@@ -60,6 +60,9 @@ set(live_effects_SRC
 	parameter/array.cpp
 	parameter/bool.cpp
 	parameter/filletchamferpointarray.cpp
+	parameter/item-reference.cpp
+	parameter/item.cpp
+	parameter/originalitem.cpp
 	parameter/originalpath.cpp
 	parameter/originalpatharray.cpp
 	parameter/parameter.cpp
@@ -142,6 +145,9 @@ set(live_effects_SRC
 	parameter/bool.h
 	parameter/enum.h
 	parameter/filletchamferpointarray.h
+	parameter/item.h
+	parameter/item-reference.h
+	parameter/originalitem.h
 	parameter/originalpath.h
 	parameter/originalpatharray.h
 	parameter/parameter.h
diff --git a/src/live_effects/effect.cpp b/src/live_effects/effect.cpp
index 5cc0d6f20..81a512d23 100644
--- a/src/live_effects/effect.cpp
+++ b/src/live_effects/effect.cpp
@@ -116,7 +116,7 @@ const Util::EnumData<EffectType> LPETypeData[] = {
     {RULER,                 N_("Ruler"),                   "ruler"},
 /* 0.91 */
     {POWERSTROKE,           N_("Power stroke"),            "powerstroke"},
-    {CLONE_ORIGINAL,        N_("Clone original path"),     "clone_original"},
+    {CLONE_ORIGINAL,        N_("Clone original"),          "clone_original"},
 /* 0.92 */
     {SIMPLIFY,              N_("Simplify"),                "simplify"},
     {LATTICE2,              N_("Lattice Deformation 2"),   "lattice2"},
@@ -356,7 +356,7 @@ Effect::Effect(LivePathEffectObject *lpeobject)
       sp_lpe_item(NULL),
       current_zoom(1),
       upd_params(true),
-      sp_curve(NULL),
+      sp_shape(NULL),
       provides_own_flash_paths(true), // is automatically set to false if providesOwnFlashPaths() is not overridden
       is_ready(false) // is automatically set to false if providesOwnFlashPaths() is not overridden
 {
@@ -392,9 +392,9 @@ Effect::doOnApply (SPLPEItem const*/*lpeitem*/)
 }
 
 void
-Effect::setSelectedNodePoints(std::vector<Geom::Point> sNP)
+Effect::setSelectedNodePoints(std::vector<Geom::Point> selected_np)
 {
-    selectedNodesPoints = sNP;
+    selected_nodes_points = selected_np;
 }
 
 void
@@ -404,16 +404,16 @@ Effect::setCurrentZoom(double cZ)
 }
 
 bool
-Effect::isNodePointSelected(Geom::Point const &nodePoint) const
+Effect::isNodePointSelected(Geom::Point const &node_point) const
 {
-    if (selectedNodesPoints.size() > 0) {
+    if (selected_nodes_points.size() > 0) {
         using Geom::X;
         using Geom::Y; 
-        for (std::vector<Geom::Point>::const_iterator i = selectedNodesPoints.begin();
-                i != selectedNodesPoints.end(); ++i) {
+        for (std::vector<Geom::Point>::const_iterator i = selected_nodes_points.begin();
+                i != selected_nodes_points.end(); ++i) {
             Geom::Point p = *i;
             Geom::Affine transformCoordinate = sp_lpe_item->i2dt_affine();
-            Geom::Point p2(nodePoint[X],nodePoint[Y]);
+            Geom::Point p2(node_point[X], node_point[Y]);
             p2 *= transformCoordinate;
             if (Geom::are_near(p, p2, 0.01)) {
                 return true;
@@ -446,21 +446,24 @@ void Effect::doOnVisibilityToggled(SPLPEItem const* /*lpeitem*/)
 void Effect::doOnApply_impl(SPLPEItem const* lpeitem)
 {
     sp_lpe_item = const_cast<SPLPEItem *>(lpeitem);
-    /*sp_curve = SP_SHAPE(sp_lpe_item)->getCurve();
-    pathvector_before_effect = sp_curve->get_pathvector();*/
+    SPShape * shape = dynamic_cast<SPShape *>(sp_lpe_item);
+    if(shape){
+        setCurrentShape(shape);
+    }
     doOnApply(lpeitem);
 }
 
 void Effect::doBeforeEffect_impl(SPLPEItem const* lpeitem)
 {
     sp_lpe_item = const_cast<SPLPEItem *>(lpeitem);
-    //printf("(SPLPEITEM*) %p\n", sp_lpe_item);
+    //Groups set shape in performPathEffect before each call to doEffect
     SPShape * shape = dynamic_cast<SPShape *>(sp_lpe_item);
     if(shape){
-        sp_curve = shape->getCurve();
-        pathvector_before_effect = sp_curve->get_pathvector();
+        setCurrentShape(shape);
     }
+    //printf("(SPLPEITEM*) %p\n", sp_lpe_item);
     doBeforeEffect(lpeitem);
+
     if (apply_to_clippath_and_mask && SP_IS_GROUP(sp_lpe_item)) {
         sp_lpe_item->apply_to_clippath(sp_lpe_item);
         sp_lpe_item->apply_to_mask(sp_lpe_item);
@@ -468,6 +471,16 @@ void Effect::doBeforeEffect_impl(SPLPEItem const* lpeitem)
     update_helperpath();
 }
 
+void Effect::setCurrentShape(SPShape * shape){ 
+    if(shape){
+        sp_shape = shape;
+        if (!(sp_curve = sp_shape->getCurve())) {
+            // oops
+            return;
+        }
+        pathvector_before_effect = sp_curve->get_pathvector();
+    }
+}
 /**
  * Effects can have a parameter path set before they are applied by accepting a nonzero number of
  * mouse clicks. This method activates the pen context, which waits for the specified number of
diff --git a/src/live_effects/effect.h b/src/live_effects/effect.h
index bc56c2390..b1dc0eabb 100644
--- a/src/live_effects/effect.h
+++ b/src/live_effects/effect.h
@@ -79,7 +79,8 @@ public:
     static int acceptsNumClicks(EffectType type);
     int acceptsNumClicks() const { return acceptsNumClicks(effectType()); }
     void doAcceptPathPreparations(SPLPEItem *lpeitem);
-
+    SPShape * getCurrentShape(){ return sp_shape; };
+    void setCurrentShape(SPShape * shape);
     /*
      * isReady() indicates whether all preparations which are necessary to apply the LPE are done,
      * e.g., waiting for a parameter path either before the effect is created or when it needs a
@@ -169,9 +170,10 @@ protected:
     // instead of normally 'splitting' the path into continuous pwd2 paths and calling doEffect_pwd2 for each.
     bool concatenate_before_pwd2;
 
-    SPLPEItem * sp_lpe_item; // these get stored in doBeforeEffect_impl, and derived classes may do as they please with them.
+    SPLPEItem * sp_lpe_item; // these get stored in doBeforeEffect_impl, and derived classes may do as they please with them.z
+    SPShape * sp_shape; // these get stored in doBeforeEffect_impl before doEffect chain, or in performPathEffects on groups, and derived classes may do as they please with them.
     double current_zoom;
-    std::vector<Geom::Point> selectedNodesPoints;
+    std::vector<Geom::Point> selected_nodes_points;
     SPCurve * sp_curve;
     Geom::PathVector pathvector_before_effect;
 private:
diff --git a/src/live_effects/lpe-clone-original.cpp b/src/live_effects/lpe-clone-original.cpp
index 10418a02d..76cc56b8f 100644
--- a/src/live_effects/lpe-clone-original.cpp
+++ b/src/live_effects/lpe-clone-original.cpp
@@ -6,6 +6,12 @@
 
 #include "live_effects/lpe-clone-original.h"
 #include "display/curve.h"
+#include "svg/path-string.h"
+#include "svg/svg.h"
+#include "sp-clippath.h"
+#include "sp-mask.h"
+#include "xml/sp-css-attr.h"
+
 // TODO due to internal breakage in glibmm headers, this must be last:
 #include <glibmm/i18n.h>
 
@@ -14,9 +20,258 @@ namespace LivePathEffect {
 
 LPECloneOriginal::LPECloneOriginal(LivePathEffectObject *lpeobject) :
     Effect(lpeobject),
-    linked_path(_("Linked path:"), _("Path from which to take the original path data"), "linkedpath", &wr, this)
+    linked_path("LEGACY FALLBACK", "LEGACY FALLBACK", "linkedpath", &wr, this),
+    linked_item(_("Linked Item:"), _("Item from which to take the original data"), "linked_item", &wr, this),
+    scale(_("Scale %"), _("Scale item %"), "scale", &wr, this, 100.0),
+    preserve_position(_("Preserve position"), _("Preserve position"), "preserve_position", &wr, this, false),
+    use_center(_("Relative center of element"), _("Relative center of element"), "use_center", &wr, this, true),
+    attributes("Attributes linked", "Attributes linked", "attributes", &wr, this,""),
+    style_attributes("Style attributes linked", "Style attributes linked", "style_attributes", &wr, this,"")
+{
+    registerParameter(&linked_path);
+    registerParameter(&linked_item);
+    registerParameter(&scale);
+    registerParameter(&attributes);
+    registerParameter(&style_attributes);
+    registerParameter(&preserve_position);
+    registerParameter(&use_center);
+    scale.param_set_range(0.01, 999999.0);
+    scale.param_set_increments(1, 1);
+    scale.param_set_digits(2);
+    attributes.param_hide_canvas_text();
+    style_attributes.param_hide_canvas_text();
+    preserve_position_changed = preserve_position;
+    preserve_affine = Geom::identity();
+}
+
+bool hasLinkedTransform( const char * attributes) {
+    gchar ** attarray = g_strsplit(attributes, ",", 0);
+    gchar ** iter = attarray;
+    bool has_linked_transform = false;
+    while (*iter != NULL) {
+        const char* attribute = (*iter);
+        if ( std::strcmp(attribute, "transform") == 0 ) {
+            has_linked_transform = true;
+        }
+        iter++;
+    }
+    return has_linked_transform;
+}
+
+void
+LPECloneOriginal::cloneAttrbutes(SPObject *origin, SPObject *dest, bool live, const char * attributes, const char * style_attributes, bool root) 
+{
+    SPDocument * document = SP_ACTIVE_DOCUMENT;
+    if ( SP_IS_GROUP(origin) && SP_IS_GROUP(dest) && SP_GROUP(origin)->getItemCount() == SP_GROUP(dest)->getItemCount() ) {
+        std::vector< SPObject * > childs = origin->childList(true);
+        size_t index = 0;
+        for (std::vector<SPObject * >::iterator obj_it = childs.begin(); 
+             obj_it != childs.end(); ++obj_it) {
+            SPObject *dest_child = dest->nthChild(index); 
+            cloneAttrbutes((*obj_it), dest_child, live, attributes, style_attributes, false); 
+            index++;
+        }
+    }
+    //Attributes
+    SPShape * shape_origin =  SP_SHAPE(origin);
+    SPPath * path_origin =  SP_PATH(origin);
+    SPShape * shape_dest =  SP_SHAPE(dest);
+    SPMask *mask_origin = SP_ITEM(origin)->mask_ref->getObject();
+    SPMask *mask_dest = SP_ITEM(dest)->mask_ref->getObject();
+    if(mask_origin && mask_dest) {
+        std::vector<SPObject*> mask_list = mask_origin->childList(true);
+        std::vector<SPObject*> mask_list_dest = mask_dest->childList(true);
+        if (mask_list.size() == mask_list_dest.size()) {
+            size_t i = 0;
+            for ( std::vector<SPObject*>::const_iterator iter=mask_list.begin();iter!=mask_list.end();++iter) {
+                SPObject * mask_data = *iter;
+                SPObject * mask_dest_data = mask_list_dest[i];
+                cloneAttrbutes(mask_data, mask_dest_data, live, attributes, style_attributes, false);
+                i++;
+            }
+        }
+    }
+    SPClipPath *clippath_origin = SP_ITEM(origin)->clip_ref->getObject();
+    SPClipPath *clippath_dest = SP_ITEM(dest)->clip_ref->getObject();
+    if(clippath_origin && clippath_dest) {
+        std::vector<SPObject*> clippath_list = clippath_origin->childList(true);
+        std::vector<SPObject*> clippath_list_dest = clippath_dest->childList(true);
+        if (clippath_list.size() == clippath_list_dest.size()) {
+            size_t i = 0;
+            for ( std::vector<SPObject*>::const_iterator iter=clippath_list.begin();iter!=clippath_list.end();++iter) {
+                SPObject * clippath_data = *iter;
+                SPObject * clippath_dest_data = clippath_list_dest[i];
+                cloneAttrbutes(clippath_data, clippath_dest_data, live, attributes, style_attributes, false);
+                i++;
+            }
+        }
+    }
+    gchar ** attarray = g_strsplit(attributes, ",", 0);
+    gchar ** iter = attarray;
+    Geom::Affine affine_dest = Geom::identity();
+    Geom::Affine affine_origin = Geom::identity();
+    Geom::Affine affine_previous = Geom::identity();
+    sp_svg_transform_read(SP_ITEM(dest)->getAttribute("transform"), &affine_dest);
+    sp_svg_transform_read(SP_ITEM(origin)->getAttribute("transform"), &affine_origin);
+    while (*iter != NULL) {
+        const char* attribute = (*iter);
+        if ( std::strcmp(attribute, "transform") == 0 ) {
+            if (preserve_position) {
+                Geom::Affine dest_affine = Geom::identity();
+                if (root) {
+                    dest_affine *= affine_origin;
+                    if (preserve_affine == Geom::identity()) {
+                        dest_affine *= Geom::Translate(affine_dest.translation());
+                    }
+                    dest_affine *= Geom::Translate(affine_origin.translation()).inverse();
+                    dest_affine *= Geom::Translate(preserve_affine.translation());
+                    affine_previous = preserve_affine;
+                    preserve_affine = Geom::identity();
+                    SP_ITEM(dest)->getRepr()->setAttribute("transform",sp_svg_transform_write(dest_affine));
+                }
+            } else {
+                SP_ITEM(dest)->getRepr()->setAttribute("transform",sp_svg_transform_write(affine_origin));
+            }
+        } else if ( shape_dest && shape_origin && live && (std::strcmp(attribute, "d") == 0 || std::strcmp(attribute, "inkscape:original-d") == 0)) {
+            SPCurve *c = NULL;
+            if (std::strcmp(attribute, "d") == 0) {
+                c = shape_origin->getCurve();
+            } else {
+                c = shape_origin->getCurveBeforeLPE();
+            }
+            if (c) {
+                Geom::PathVector c_pv = c->get_pathvector();
+                Geom::OptRect orig_bbox = SP_ITEM(origin)->geometricBounds();
+                Geom::OptRect dest_bbox = SP_ITEM(dest)->geometricBounds();
+                if (dest_bbox && orig_bbox && root) {
+                    Geom::Point orig_point = (*orig_bbox).corner(0);
+                    Geom::Point dest_point = (*dest_bbox).corner(0);
+                    if (use_center) {
+                        orig_point = (*orig_bbox).midpoint();
+                        dest_point = (*dest_bbox).midpoint();
+                    }
+                    if (scale != 100.0) {
+                        double scale_affine = scale/100.0;
+                        Geom::Scale scale = Geom::Scale(scale_affine);
+                        c_pv *= Geom::Translate(orig_point).inverse();
+                        c_pv *= scale;
+                        c_pv *= Geom::Translate(orig_point);
+                    }
+                    if (preserve_position && hasLinkedTransform(attributes)) {
+                        c_pv *= Geom::Translate(dest_point - orig_point);
+                    }
+                }
+                c_pv *= i2anc_affine(dest, sp_lpe_item);
+                c->set_pathvector(c_pv);
+                if (!path_origin) {
+                    shape_dest->setCurveInsync(c, TRUE);
+                    dest->getRepr()->setAttribute(attribute, sp_svg_write_path(c_pv));
+                } else {
+                    shape_dest->setCurve(c, TRUE);
+                }
+                c->unref();
+            } else {
+                dest->getRepr()->setAttribute(attribute, NULL);
+            }
+        } else {
+            dest->getRepr()->setAttribute(attribute, origin->getRepr()->attribute(attribute));
+        }
+        iter++;
+    }
+    g_strfreev (attarray);
+    SPCSSAttr *css_origin = sp_repr_css_attr_new();
+    sp_repr_css_attr_add_from_string(css_origin, origin->getRepr()->attribute("style"));
+    SPCSSAttr *css_dest = sp_repr_css_attr_new();
+    sp_repr_css_attr_add_from_string(css_dest, dest->getRepr()->attribute("style"));
+    gchar ** styleattarray = g_strsplit(style_attributes, ",", 0);
+    gchar ** styleiter = styleattarray;
+    while (*styleiter != NULL) {
+        const char* attribute = (*styleiter);
+        const char* origin_attribute = sp_repr_css_property(css_origin, attribute, "");
+        if (origin_attribute == "") {
+            sp_repr_css_set_property (css_dest, attribute, NULL);
+        } else {
+            sp_repr_css_set_property (css_dest, attribute, origin_attribute);
+        }
+        styleiter++;
+    }
+    g_strfreev (styleattarray);
+    Glib::ustring css_str;
+    sp_repr_css_write_string(css_dest,css_str);
+    dest->getRepr()->setAttribute("style", css_str.c_str());
+}
+
+void
+LPECloneOriginal::doBeforeEffect (SPLPEItem const* lpeitem){
+    original_bbox(lpeitem);
+    if (linked_path.linksToPath()) { //Legacy staff
+        Glib::ustring attributes_value("d");
+        attributes.param_setValue(attributes_value);
+        attributes.write_to_SVG();
+        Glib::ustring style_attributes_value("");
+        style_attributes.param_setValue(style_attributes_value);
+        style_attributes.write_to_SVG();
+        linked_item.param_readSVGValue(linked_path.param_getSVGValue());
+        linked_path.param_readSVGValue("");
+    }
+
+    if (linked_item.linksToItem()) {
+         if ( preserve_position_changed != preserve_position ) {
+            if (!preserve_position) {
+                sp_svg_transform_read(SP_ITEM(sp_lpe_item)->getAttribute("transform"), &preserve_affine);
+            }
+            preserve_position_changed = preserve_position;
+        }
+        cloneAttrbutes(linked_item.getObject(), SP_OBJECT(sp_lpe_item), true, attributes.param_getSVGValue(), style_attributes.param_getSVGValue(), true);
+    }
+}
+
+
+Gtk::Widget *
+LPECloneOriginal::newWidget()
 {
-    registerParameter( dynamic_cast<Parameter *>(&linked_path) );
+    // use manage here, because after deletion of Effect object, others might
+    // still be pointing to this widget.
+    Gtk::VBox *vbox = Gtk::manage(new Gtk::VBox(Effect::newWidget()));
+    vbox->set_border_width(5);
+    vbox->set_homogeneous(false);
+    vbox->set_spacing(2);
+
+    std::vector<Parameter *>::iterator it = param_vector.begin();
+    while (it != param_vector.end()) {
+        if ((*it)->widget_is_visible) {
+            Parameter * param = *it;
+            if (param->param_key == "linkedpath") {
+                ++it;
+                continue;
+            }
+            Gtk::Widget * widg = param->param_newWidget();
+            Glib::ustring * tip = param->param_getTooltip();
+            if (widg) {
+                vbox->pack_start(*widg, true, true, 2);
+                if (tip) {
+                    widg->set_tooltip_text(*tip);
+                } else {
+                    widg->set_tooltip_text("");
+                    widg->set_has_tooltip(false);
+                }
+            }
+        }
+
+        ++it;
+    }
+    this->upd_params = false;
+    return dynamic_cast<Gtk::Widget *>(vbox);
+}
+
+void
+LPECloneOriginal::doOnApply(SPLPEItem const* lpeitem){
+    Glib::ustring attributes_value("d,transform");
+    attributes.param_setValue(attributes_value);
+    attributes.write_to_SVG();
+    Glib::ustring style_attributes_value("opacity,stroke-width");
+    style_attributes.param_setValue(style_attributes_value);
+    style_attributes.write_to_SVG();
 }
 
 LPECloneOriginal::~LPECloneOriginal()
@@ -24,12 +279,22 @@ LPECloneOriginal::~LPECloneOriginal()
 
 }
 
-void LPECloneOriginal::doEffect (SPCurve * curve)
+void
+LPECloneOriginal::transform_multiply(Geom::Affine const& postmul, bool set)
+{
+    if (linked_item.linksToItem()) {
+        bool changed = false;
+        linked_item.getObject()->requestModified(SP_OBJECT_MODIFIED_FLAG);
+    }
+}
+
+void 
+LPECloneOriginal::doEffect (SPCurve * curve)
 {
-    if ( linked_path.linksToPath() ) {
-        Geom::PathVector linked_pathv = linked_path.get_pathvector();
-        if ( !linked_pathv.empty() ) {
-            curve->set_pathvector(linked_pathv);
+    if (linked_item.linksToItem()) {
+        SPShape * shape = getCurrentShape();
+        if(shape){
+            curve->set_pathvector(shape->getCurve()->get_pathvector());
         }
     }
 }
diff --git a/src/live_effects/lpe-clone-original.h b/src/live_effects/lpe-clone-original.h
index abf65ded8..064fe84b2 100644
--- a/src/live_effects/lpe-clone-original.h
+++ b/src/live_effects/lpe-clone-original.h
@@ -10,22 +10,37 @@
  */
 
 #include "live_effects/effect.h"
+#include "live_effects/parameter/originalitem.h"
 #include "live_effects/parameter/originalpath.h"
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/point.h"
+#include "live_effects/parameter/text.h"
+#include "live_effects/lpegroupbbox.h"
 
 namespace Inkscape {
 namespace LivePathEffect {
 
-class LPECloneOriginal : public Effect {
+class LPECloneOriginal : public Effect, GroupBBoxEffect {
 public:
     LPECloneOriginal(LivePathEffectObject *lpeobject);
     virtual ~LPECloneOriginal();
-
+    virtual void doOnApply(SPLPEItem const* lpeitem);
     virtual void doEffect (SPCurve * curve);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
+    virtual void transform_multiply(Geom::Affine const& postmul, bool set);
+    virtual Gtk::Widget * newWidget();
+    void cloneAttrbutes(SPObject *origin, SPObject *dest, bool live, const char * attributes, const char * style_attributes, bool root);
 
 private:
     OriginalPathParam  linked_path;
-
-private:
+    OriginalItemParam  linked_item;
+    ScalarParam scale;
+    BoolParam preserve_position;
+    BoolParam use_center;
+    TextParam attributes;
+    TextParam style_attributes;
+    bool preserve_position_changed;
+    Geom::Affine preserve_affine;
     LPECloneOriginal(const LPECloneOriginal&);
     LPECloneOriginal& operator=(const LPECloneOriginal&);
 };
diff --git a/src/live_effects/lpe-copy_rotate.cpp b/src/live_effects/lpe-copy_rotate.cpp
index 813f25d3d..250f6aa29 100644
--- a/src/live_effects/lpe-copy_rotate.cpp
+++ b/src/live_effects/lpe-copy_rotate.cpp
@@ -125,7 +125,6 @@ void
 LPECopyRotate::transform_multiply(Geom::Affine const& postmul, bool set)
 {
     // cycle through all parameters. Most parameters will not need transformation, but path and point params do.
-
     for (std::vector<Parameter *>::iterator it = param_vector.begin(); it != param_vector.end(); ++it) {
         Parameter * param = *it;
         param->param_transform_multiply(postmul, set);
diff --git a/src/live_effects/parameter/item-reference.cpp b/src/live_effects/parameter/item-reference.cpp
new file mode 100644
index 000000000..a775d93b7
--- /dev/null
+++ b/src/live_effects/parameter/item-reference.cpp
@@ -0,0 +1,44 @@
+/*
+ * The reference corresponding to href of LPE Item parameter.
+ *
+ * Copyright (C) 2008 Johan Engelen
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/parameter/item-reference.h"
+
+#include "sp-shape.h"
+#include "sp-text.h"
+#include "sp-item-group.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+bool ItemReference::_acceptObject(SPObject * const obj) const
+{
+    if (SP_IS_SHAPE(obj) || SP_IS_TEXT(obj) || SP_IS_GROUP(obj)) {
+        /* Refuse references to lpeobject */
+        if (obj == getOwner()) {
+            return false;
+        }
+        // TODO: check whether the referred item has this LPE applied, if so: deny deny deny!
+        return URIReference::_acceptObject(obj);
+    } else {
+        return false;
+    }
+}
+
+} // namespace LivePathEffect
+} // namespace Inkscape
+
+/*
+  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 :
diff --git a/src/live_effects/parameter/item-reference.h b/src/live_effects/parameter/item-reference.h
new file mode 100644
index 000000000..91231455a
--- /dev/null
+++ b/src/live_effects/parameter/item-reference.h
@@ -0,0 +1,56 @@
+#ifndef SEEN_LPE_ITEM_REFERENCE_H
+#define SEEN_LPE_ITEM_REFERENCE_H
+
+/*
+ * Copyright (C) 2008-2012 Authors
+ * Authors: Johan Engelen
+ *          Abhishek Sharma
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information.
+ */
+
+#include <uri-references.h>
+
+class SPItem;
+namespace Inkscape {
+namespace XML { class Node; }
+
+namespace LivePathEffect {
+
+/**
+ * The reference corresponding to href of LPE ItemParam.
+ */
+class ItemReference : public Inkscape::URIReference {
+public:
+    ItemReference(SPObject *owner) : URIReference(owner) {}
+
+    SPItem *getObject() const {
+        return (SPItem *)URIReference::getObject();
+    }
+
+protected:
+    virtual bool _acceptObject(SPObject * const obj) const;
+
+private:
+    ItemReference(const ItemReference&);
+    ItemReference& operator=(const ItemReference&);
+};
+
+} // namespace LivePathEffect
+
+} // namespace Inkscape
+
+
+
+#endif /* !SEEN_LPE_PATH_REFERENCE_H */
+
+/*
+  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 :
diff --git a/src/live_effects/parameter/item.cpp b/src/live_effects/parameter/item.cpp
new file mode 100644
index 000000000..8caea4e26
--- /dev/null
+++ b/src/live_effects/parameter/item.cpp
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ *   Abhishek Sharma
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "ui/widget/point.h"
+#include <glibmm/i18n.h>
+
+#include "live_effects/parameter/item.h"
+#include "live_effects/effect.h"
+#include "svg/svg.h"
+
+#include "widgets/icon.h"
+#include <gtk/gtk.h>
+#include "selection-chemistry.h"
+#include "xml/repr.h"
+#include "desktop.h"
+#include "inkscape.h"
+#include "message-stack.h"
+
+// clipboard support
+#include "ui/clipboard.h"
+// required for linking to other paths
+#include "uri.h"
+
+#include <gtkmm/button.h>
+#include <gtkmm/label.h>
+#include "ui/icon-names.h"
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+ItemParam::ItemParam( const Glib::ustring& label, const Glib::ustring& tip,
+                      const Glib::ustring& key, Inkscape::UI::Widget::Registry* wr,
+                      Effect* effect, const gchar * default_value)
+    : Parameter(label, tip, key, wr, effect),
+      changed(true),
+      href(NULL),
+      ref( (SPObject*)effect->getLPEObj() )
+{
+    defvalue = g_strdup(default_value);
+    ref_changed_connection = ref.changedSignal().connect(sigc::mem_fun(*this, &ItemParam::ref_changed));
+}
+
+ItemParam::~ItemParam()
+{
+    remove_link();
+    g_free(defvalue);
+}
+
+void
+ItemParam::param_set_default()
+{
+    param_readSVGValue(defvalue);
+}
+
+
+void
+ItemParam::param_set_and_write_default()
+{
+    param_write_to_repr(defvalue);
+}
+
+bool
+ItemParam::param_readSVGValue(const gchar * strvalue)
+{
+    if (strvalue) {
+        remove_link();
+        if (strvalue[0] == '#') {
+            if (href)
+                g_free(href);
+            href = g_strdup(strvalue);
+            try {
+                ref.attach(Inkscape::URI(href));
+                //lp:1299948
+                SPItem* i = ref.getObject();
+                if (i) {
+                    linked_modified_callback(i, SP_OBJECT_MODIFIED_FLAG);
+                } // else: document still processing new events. Repr of the linked object not created yet.
+            } catch (Inkscape::BadURIException &e) {
+                g_warning("%s", e.what());
+                ref.detach();
+            }
+        }
+        emit_changed();
+        return true;
+    }
+
+    return false;
+}
+
+gchar *
+ItemParam::param_getSVGValue() const
+{
+    return g_strdup(href);
+}
+
+Gtk::Widget *
+ItemParam::param_newWidget()
+{
+    Gtk::HBox * _widget = Gtk::manage(new Gtk::HBox());
+    Gtk::Widget*  pIcon = Gtk::manage( sp_icon_get_icon( INKSCAPE_ICON("edit-clone"), Inkscape::ICON_SIZE_BUTTON) );
+    Gtk::Button * pButton = Gtk::manage(new Gtk::Button());
+    Gtk::Label* pLabel = Gtk::manage(new Gtk::Label(param_label));
+    static_cast<Gtk::HBox*>(_widget)->pack_start(*pLabel, true, true);
+    pLabel->set_tooltip_text(param_tooltip);
+    pButton->set_relief(Gtk::RELIEF_NONE);
+    pIcon->show();
+    pButton->add(*pIcon);
+    pButton->show();
+    pButton->signal_clicked().connect(sigc::mem_fun(*this, &ItemParam::on_link_button_click));
+    static_cast<Gtk::HBox*>(_widget)->pack_start(*pButton, true, true);
+    pButton->set_tooltip_text(_("Link to item on clipboard"));
+
+    static_cast<Gtk::HBox*>(_widget)->show_all_children();
+
+    return dynamic_cast<Gtk::Widget *> (_widget);
+}
+
+void
+ItemParam::emit_changed()
+{
+    changed = true;
+    signal_item_changed.emit();
+}
+
+
+void
+ItemParam::addCanvasIndicators(SPLPEItem const*/*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
+{
+}
+
+
+void
+ItemParam::start_listening(SPObject * to)
+{
+    if ( to == NULL ) {
+        return;
+    }
+    linked_delete_connection = to->connectDelete(sigc::mem_fun(*this, &ItemParam::linked_delete));
+    linked_modified_connection = to->connectModified(sigc::mem_fun(*this, &ItemParam::linked_modified));
+    if (SP_IS_ITEM(to)) {
+        linked_transformed_connection = SP_ITEM(to)->connectTransformed(sigc::mem_fun(*this, &ItemParam::linked_transformed));
+    }
+    linked_modified(to, SP_OBJECT_MODIFIED_FLAG); // simulate linked_modified signal, so that path data is updated
+}
+
+void
+ItemParam::quit_listening(void)
+{
+    linked_modified_connection.disconnect();
+    linked_delete_connection.disconnect();
+    linked_transformed_connection.disconnect();
+}
+
+void
+ItemParam::ref_changed(SPObject */*old_ref*/, SPObject *new_ref)
+{
+    quit_listening();
+    if ( new_ref ) {
+        start_listening(new_ref);
+    }
+}
+
+void
+ItemParam::remove_link()
+{
+    if (href) {
+        ref.detach();
+        g_free(href);
+        href = NULL;
+    }
+}
+
+void
+ItemParam::linked_delete(SPObject */*deleted*/)
+{
+    quit_listening();
+    remove_link();
+}
+
+void ItemParam::linked_modified(SPObject *linked_obj, guint flags)
+{
+    linked_modified_callback(linked_obj, flags);
+}
+
+void ItemParam::linked_transformed(Geom::Affine const *rel_transf, SPItem *moved_item)
+{
+    linked_transformed_callback(rel_transf, moved_item);
+}
+
+void
+ItemParam::linked_modified_callback(SPObject *linked_obj, guint /*flags*/)
+{
+    emit_changed();
+    SP_OBJECT(param_effect->getLPEObj())->requestModified(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void
+ItemParam::on_link_button_click()
+{
+    Inkscape::UI::ClipboardManager *cm = Inkscape::UI::ClipboardManager::get();
+    const gchar * iid = cm->getFirstObjectID();
+    if (!iid) {
+        return;
+    }
+    
+    Glib::ustring itemid(iid);
+
+    if (itemid.empty()) {
+        return;
+    }
+
+    // add '#' at start to make it an uri.
+    itemid.insert(itemid.begin(), '#');
+    if ( href && strcmp(itemid.c_str(), href) == 0 ) {
+        // no change, do nothing
+        return;
+    } else {
+        // TODO:
+        // check if id really exists in document, or only in clipboard document: if only in clipboard then invalid
+        // check if linking to object to which LPE is applied (maybe delegated to PathReference
+
+        param_write_to_repr(itemid.c_str());
+        DocumentUndo::done(param_effect->getSPDoc(), SP_VERB_DIALOG_LIVE_PATH_EFFECT,
+                           _("Link item parameter to path"));
+    }
+}
+
+} /* namespace LivePathEffect */
+
+} /* namespace Inkscape */
+
+/*
+  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 :
diff --git a/src/live_effects/parameter/item.h b/src/live_effects/parameter/item.h
new file mode 100644
index 000000000..6c719d451
--- /dev/null
+++ b/src/live_effects/parameter/item.h
@@ -0,0 +1,79 @@
+#ifndef INKSCAPE_LIVEPATHEFFECT_PARAMETER_ITEM_H
+#define INKSCAPE_LIVEPATHEFFECT_PARAMETER_ITEM_H
+
+/*
+ * Inkscape::LivePathEffectParameters
+ *
+* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include <glib.h>
+
+
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/item-reference.h"
+#include <stddef.h>
+#include <sigc++/sigc++.h>
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+class ItemParam : public Parameter {
+public:
+    ItemParam ( const Glib::ustring& label,
+                const Glib::ustring& tip,
+                const Glib::ustring& key,
+                Inkscape::UI::Widget::Registry* wr,
+                Effect* effect,
+                const gchar * default_value = "");
+    virtual ~ItemParam();
+    virtual Gtk::Widget * param_newWidget();
+
+    virtual bool param_readSVGValue(const gchar * strvalue);
+    virtual gchar * param_getSVGValue() const;
+
+    virtual void param_set_default();
+    void param_set_and_write_default();
+    virtual void addCanvasIndicators(SPLPEItem const* lpeitem, std::vector<Geom::PathVector> &hp_vec);
+
+    sigc::signal <void> signal_item_pasted;
+    sigc::signal <void> signal_item_changed;
+    bool changed; /* this gets set whenever the path is changed (this is set to true, and then the signal_item_changed signal is emitted).
+                   * the user must set it back to false if she wants to use it sensibly */
+protected:
+
+    gchar * href;     // contains link to other object, e.g. "#path2428", NULL if ItemParam contains pathdata itself
+    ItemReference ref;
+    sigc::connection ref_changed_connection;
+    sigc::connection linked_delete_connection;
+    sigc::connection linked_modified_connection;
+    sigc::connection linked_transformed_connection;
+    void ref_changed(SPObject *old_ref, SPObject *new_ref);
+    void remove_link();
+    void start_listening(SPObject * to);
+    void quit_listening(void);
+    void linked_delete(SPObject *deleted);
+    void linked_modified(SPObject *linked_obj, guint flags);
+    void linked_transformed(Geom::Affine const *rel_transf, SPItem *moved_item);
+    virtual void linked_modified_callback(SPObject *linked_obj, guint flags);
+    virtual void linked_transformed_callback(Geom::Affine const * /*rel_transf*/, SPItem * /*moved_item*/) {};
+    void on_link_button_click();
+
+    void emit_changed();
+
+    gchar * defvalue;
+
+private:
+    ItemParam(const ItemParam&);
+    ItemParam& operator=(const ItemParam&);
+};
+
+
+} //namespace LivePathEffect
+
+} //namespace Inkscape
+
+#endif
diff --git a/src/live_effects/parameter/originalitem.cpp b/src/live_effects/parameter/originalitem.cpp
new file mode 100644
index 000000000..015fa0bd4
--- /dev/null
+++ b/src/live_effects/parameter/originalitem.cpp
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) Johan Engelen 2012 <j.b.c.engelen@alumnus.utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <gtkmm/box.h>
+#include "live_effects/parameter/originalitem.h"
+
+#include "widgets/icon.h"
+#include <glibmm/i18n.h>
+#include <gtkmm/button.h>
+#include <gtkmm/label.h>
+
+#include "uri.h"
+#include "sp-shape.h"
+#include "sp-text.h"
+#include "display/curve.h"
+#include "live_effects/effect.h"
+
+#include "inkscape.h"
+#include "desktop.h"
+#include "selection.h"
+#include "ui/icon-names.h"
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+OriginalItemParam::OriginalItemParam( const Glib::ustring& label, const Glib::ustring& tip,
+                      const Glib::ustring& key, Inkscape::UI::Widget::Registry* wr,
+                      Effect* effect)
+    : ItemParam(label, tip, key, wr, effect, "")
+{
+}
+
+OriginalItemParam::~OriginalItemParam()
+{
+
+}
+
+Gtk::Widget *
+OriginalItemParam::param_newWidget()
+{
+    Gtk::HBox *_widget = Gtk::manage(new Gtk::HBox());
+
+    { // Label
+        Gtk::Label *pLabel = Gtk::manage(new Gtk::Label(param_label));
+        static_cast<Gtk::HBox*>(_widget)->pack_start(*pLabel, true, true);
+        pLabel->set_tooltip_text(param_tooltip);
+    }
+
+    { // Paste item to link button
+        Gtk::Widget *pIcon = Gtk::manage( sp_icon_get_icon( INKSCAPE_ICON("edit-paste"), Inkscape::ICON_SIZE_BUTTON) );
+        Gtk::Button *pButton = Gtk::manage(new Gtk::Button());
+        pButton->set_relief(Gtk::RELIEF_NONE);
+        pIcon->show();
+        pButton->add(*pIcon);
+        pButton->show();
+        pButton->signal_clicked().connect(sigc::mem_fun(*this, &OriginalItemParam::on_link_button_click));
+        static_cast<Gtk::HBox*>(_widget)->pack_start(*pButton, true, true);
+        pButton->set_tooltip_text(_("Link to item"));
+    }
+
+    { // Select original button
+        Gtk::Widget *pIcon = Gtk::manage( sp_icon_get_icon("edit-select-original", Inkscape::ICON_SIZE_BUTTON) );
+        Gtk::Button *pButton = Gtk::manage(new Gtk::Button());
+        pButton->set_relief(Gtk::RELIEF_NONE);
+        pIcon->show();
+        pButton->add(*pIcon);
+        pButton->show();
+        pButton->signal_clicked().connect(sigc::mem_fun(*this, &OriginalItemParam::on_select_original_button_click));
+        static_cast<Gtk::HBox*>(_widget)->pack_start(*pButton, true, true);
+        pButton->set_tooltip_text(_("Select original"));
+    }
+
+    static_cast<Gtk::HBox*>(_widget)->show_all_children();
+
+    return dynamic_cast<Gtk::Widget *> (_widget);
+}
+
+void
+OriginalItemParam::linked_modified_callback(SPObject *linked_obj, guint /*flags*/)
+{
+    emit_changed();
+    SP_OBJECT(param_effect->getLPEObj())->requestModified(SP_OBJECT_MODIFIED_FLAG);
+}
+
+void
+OriginalItemParam::linked_transformed_callback(Geom::Affine const * /*rel_transf*/, SPItem * /*moved_item*/)
+{
+/** \todo find good way to compensate for referenced item transform, like done for normal clones.
+ *        See sp-use.cpp: sp_use_move_compensate */
+}
+
+
+void
+OriginalItemParam::on_select_original_button_click()
+{
+    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
+    SPItem *original = ref.getObject();
+    if (desktop == NULL || original == NULL) {
+        return;
+    }
+    Inkscape::Selection *selection = desktop->getSelection();
+    selection->clear();
+    selection->set(original);
+}
+
+} /* namespace LivePathEffect */
+
+} /* namespace Inkscape */
+
+/*
+  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 :
diff --git a/src/live_effects/parameter/originalitem.h b/src/live_effects/parameter/originalitem.h
new file mode 100644
index 000000000..9c67571e8
--- /dev/null
+++ b/src/live_effects/parameter/originalitem.h
@@ -0,0 +1,48 @@
+#ifndef INKSCAPE_LIVEPATHEFFECT_PARAMETER_ORIGINAL_ITEM_H
+#define INKSCAPE_LIVEPATHEFFECT_PARAMETER_ORIGINAL_ITEM_H
+
+/*
+ * Inkscape::LiveItemEffectParameters
+ *
+* Copyright (C) Johan Engelen 2012 <j.b.c.engelen@alumnus.utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/parameter/item.h"
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+class OriginalItemParam: public ItemParam {
+public:
+    OriginalItemParam ( const Glib::ustring& label,
+                const Glib::ustring& tip,
+                const Glib::ustring& key,
+                Inkscape::UI::Widget::Registry* wr,
+                Effect* effect);
+    virtual ~OriginalItemParam();
+
+    bool linksToItem() const { return (href != NULL); }
+    SPItem * getObject() const { return ref.getObject(); }
+
+    virtual Gtk::Widget * param_newWidget();
+
+protected:
+    virtual void linked_modified_callback(SPObject *linked_obj, guint flags);
+    virtual void linked_transformed_callback(Geom::Affine const *rel_transf, SPItem *moved_item);
+
+    void on_select_original_button_click();
+
+private:
+    OriginalItemParam(const OriginalItemParam&);
+    OriginalItemParam& operator=(const OriginalItemParam&);
+};
+
+
+} //namespace LivePathEffect
+
+} //namespace Inkscape
+
+#endif