const ....

(bzr r12039)

35 files changed, 84 insertions, 84 deletions

diff --git a/src/live_effects/effect.cpp b/src/live_effects/effect.cpp
index 26095d84b..b0be02b95 100644
--- a/src/live_effects/effect.cpp
+++ b/src/live_effects/effect.cpp
@@ -300,7 +300,7 @@ Effect::~Effect()
 }
 
 Glib::ustring
-Effect::getName()
+Effect::getName() const
 {
     if (lpeobj->effecttype_set && LPETypeConverter.is_valid_id(lpeobj->effecttype) )
         return Glib::ustring( _(LPETypeConverter.get_label(lpeobj->effecttype).c_str()) );
@@ -325,7 +325,7 @@ Effect::doOnApply (SPLPEItem const*/*lpeitem*/)
  * Is performed each time before the effect is updated.
  */
 void
-Effect::doBeforeEffect (SPLPEItem */*lpeitem*/)
+Effect::doBeforeEffect (SPLPEItem const*/*lpeitem*/)
 {
     //Do nothing for simple effects
 }
@@ -370,7 +370,7 @@ Effect::writeParamsToSVG() {
  * your LPE. But don't forget to call the parent method so that is_ready is set to true!
  */
 void
-Effect::acceptParamPath (SPPath */*param_path*/) {
+Effect::acceptParamPath (SPPath const*/*param_path*/) {
     setReady();
 }
 
@@ -424,7 +424,7 @@ Effect::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
 }
 
 void
-Effect::readallParameters(Inkscape::XML::Node * repr)
+Effect::readallParameters(Inkscape::XML::Node const* repr)
 {
     std::vector<Parameter *>::iterator it = param_vector.begin();
     while (it != param_vector.end()) {
@@ -491,7 +491,7 @@ Effect::addHandles(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {
  * This is the function called by external code like SPLPEItem.
  */
 std::vector<Geom::PathVector>
-Effect::getHelperPaths(SPLPEItem *lpeitem)
+Effect::getHelperPaths(SPLPEItem const* lpeitem)
 {
     std::vector<Geom::PathVector> hp_vec;
 
@@ -524,7 +524,7 @@ Effect::getHelperPaths(SPLPEItem *lpeitem)
  * This function should be overwritten by derived effects if they want to provide their own helperpaths.
  */
 void
-Effect::addCanvasIndicators(SPLPEItem */*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/)
+Effect::addCanvasIndicators(SPLPEItem const*/*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/)
 {
 }
 
diff --git a/src/live_effects/effect.h b/src/live_effects/effect.h
index 5862a24ba..f7a7155b0 100644
--- a/src/live_effects/effect.h
+++ b/src/live_effects/effect.h
@@ -54,13 +54,13 @@ public:
     EffectType effectType() const;
 
     virtual void doOnApply (SPLPEItem const* lpeitem);
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     void writeParamsToSVG();
 
-    virtual void acceptParamPath (SPPath *param_path);
+    virtual void acceptParamPath (SPPath const* param_path);
     static int acceptsNumClicks(EffectType type);
-    int acceptsNumClicks() { return acceptsNumClicks(effectType()); }
+    int acceptsNumClicks() const { return acceptsNumClicks(effectType()); }
     void doAcceptPathPreparations(SPLPEItem *lpeitem);
 
     /*
@@ -90,20 +90,20 @@ public:
     //       (but spiro lpe still needs it!)
     virtual LPEPathFlashType pathFlashType() const { return DEFAULT; }
     void addHandles(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item);
-    std::vector<Geom::PathVector> getHelperPaths(SPLPEItem *lpeitem);
+    std::vector<Geom::PathVector> getHelperPaths(SPLPEItem const* lpeitem);
 
     inline bool providesOwnFlashPaths() const {
         return provides_own_flash_paths || show_orig_path;
     }
     inline bool showOrigPath() const { return show_orig_path; }
 
-    Glib::ustring          getName();
+    Glib::ustring          getName() const;
     Inkscape::XML::Node *  getRepr();
     SPDocument *           getSPDoc();
     LivePathEffectObject * getLPEObj() {return lpeobj;};
     Parameter *            getParameter(const char * key);
 
-    void readallParameters(Inkscape::XML::Node * repr);
+    void readallParameters(Inkscape::XML::Node const* repr);
     void setParameter(const gchar * key, const gchar * new_value);
 
     inline bool isVisible() const { return is_visible; }
@@ -128,7 +128,7 @@ protected:
 
     virtual void addKnotHolderEntities(KnotHolder * /*knotholder*/, SPDesktop * /*desktop*/, SPItem * /*item*/) {};
 
-    virtual void addCanvasIndicators(SPLPEItem *lpeitem, std::vector<Geom::PathVector> &hp_vec);
+    virtual void addCanvasIndicators(SPLPEItem const* lpeitem, std::vector<Geom::PathVector> &hp_vec);
 
     std::vector<Parameter *> param_vector;
     bool _provides_knotholder_entities;
diff --git a/src/live_effects/lpe-angle_bisector.cpp b/src/live_effects/lpe-angle_bisector.cpp
index 8aa88f1f0..91f779ef3 100644
--- a/src/live_effects/lpe-angle_bisector.cpp
+++ b/src/live_effects/lpe-angle_bisector.cpp
@@ -28,14 +28,14 @@ class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityLeftEnd(LPEAngleBisector* effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityRightEnd : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityRightEnd(LPEAngleBisector* effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 } // namespace TtC
@@ -125,16 +125,16 @@ KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*or
 }
 
 Geom::Point
-KnotHolderEntityLeftEnd::knot_get()
+KnotHolderEntityLeftEnd::knot_get() const
 {
-    LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);
+    LPEAngleBisector const* lpe = dynamic_cast<LPEAngleBisector const*>(_effect);
     return lpe->ptA - lpe->dir * lpe->length_left;
 }
 
 Geom::Point
-KnotHolderEntityRightEnd::knot_get()
+KnotHolderEntityRightEnd::knot_get() const
 {
-    LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);
+    LPEAngleBisector const* lpe = dynamic_cast<LPEAngleBisector const*>(_effect);
     return lpe->ptA + lpe->dir * lpe->length_right;
 }
 
diff --git a/src/live_effects/lpe-bendpath.cpp b/src/live_effects/lpe-bendpath.cpp
index 59fd145d1..49660c91b 100644
--- a/src/live_effects/lpe-bendpath.cpp
+++ b/src/live_effects/lpe-bendpath.cpp
@@ -72,7 +72,7 @@ LPEBendPath::~LPEBendPath()
 }
 
 void
-LPEBendPath::doBeforeEffect (SPLPEItem *lpeitem)
+LPEBendPath::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     // get the item bounding box
     original_bbox(lpeitem);
diff --git a/src/live_effects/lpe-bendpath.h b/src/live_effects/lpe-bendpath.h
index 0e4b3f726..3d336e2e7 100644
--- a/src/live_effects/lpe-bendpath.h
+++ b/src/live_effects/lpe-bendpath.h
@@ -33,7 +33,7 @@ public:
     LPEBendPath(LivePathEffectObject *lpeobject);
     virtual ~LPEBendPath();
 
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     virtual Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
 
diff --git a/src/live_effects/lpe-copy_rotate.cpp b/src/live_effects/lpe-copy_rotate.cpp
index f946f0568..c1b72c3c7 100644
--- a/src/live_effects/lpe-copy_rotate.cpp
+++ b/src/live_effects/lpe-copy_rotate.cpp
@@ -34,14 +34,14 @@ class KnotHolderEntityStartingAngle : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityStartingAngle(LPECopyRotate *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityRotationAngle : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityRotationAngle(LPECopyRotate *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 } // namespace CR
@@ -188,16 +188,16 @@ KnotHolderEntityRotationAngle::knot_set(Geom::Point const &p, Geom::Point const
 }
 
 Geom::Point
-KnotHolderEntityStartingAngle::knot_get()
+KnotHolderEntityStartingAngle::knot_get() const
 {
-    LPECopyRotate* lpe = dynamic_cast<LPECopyRotate *>(_effect);
+    LPECopyRotate const *lpe = dynamic_cast<LPECopyRotate const*>(_effect);
     return lpe->start_pos;
 }
 
 Geom::Point
-KnotHolderEntityRotationAngle::knot_get()
+KnotHolderEntityRotationAngle::knot_get() const
 {
-    LPECopyRotate* lpe = dynamic_cast<LPECopyRotate *>(_effect);
+    LPECopyRotate const *lpe = dynamic_cast<LPECopyRotate const*>(_effect);
     return lpe->rot_pos;
 }
 
diff --git a/src/live_effects/lpe-envelope.cpp b/src/live_effects/lpe-envelope.cpp
index bcd63e8cb..4f5623fba 100644
--- a/src/live_effects/lpe-envelope.cpp
+++ b/src/live_effects/lpe-envelope.cpp
@@ -50,7 +50,7 @@ LPEEnvelope::~LPEEnvelope()
 }
 
 void
-LPEEnvelope::doBeforeEffect (SPLPEItem *lpeitem)
+LPEEnvelope::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     // get the item bounding box
     original_bbox(lpeitem);
diff --git a/src/live_effects/lpe-envelope.h b/src/live_effects/lpe-envelope.h
index 6a9fe1c0a..b5d6ceb50 100644
--- a/src/live_effects/lpe-envelope.h
+++ b/src/live_effects/lpe-envelope.h
@@ -31,7 +31,7 @@ public:
     LPEEnvelope(LivePathEffectObject *lpeobject);
     virtual ~LPEEnvelope();
 
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     virtual Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
 
diff --git a/src/live_effects/lpe-knot.cpp b/src/live_effects/lpe-knot.cpp
index 61e457d35..27652bf0c 100644
--- a/src/live_effects/lpe-knot.cpp
+++ b/src/live_effects/lpe-knot.cpp
@@ -46,7 +46,7 @@ class KnotHolderEntityCrossingSwitcher : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityCrossingSwitcher(LPEKnot *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
     virtual void knot_click(guint state);
 };
 
@@ -531,7 +531,7 @@ collectPathsAndWidths (SPLPEItem const *lpeitem, std::vector<Geom::Path> &paths,
 
 
 void
-LPEKnot::doBeforeEffect (SPLPEItem *lpeitem)
+LPEKnot::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     using namespace Geom;
     original_bbox(lpeitem);
@@ -631,9 +631,9 @@ KnotHolderEntityCrossingSwitcher::knot_set(Geom::Point const &p, Geom::Point con
 }
 
 Geom::Point
-KnotHolderEntityCrossingSwitcher::knot_get()
+KnotHolderEntityCrossingSwitcher::knot_get() const
 {
-    LPEKnot* lpe = dynamic_cast<LPEKnot *>(_effect);
+    LPEKnot const *lpe = dynamic_cast<LPEKnot const*>(_effect);
     return lpe->switcher;
 }
 
diff --git a/src/live_effects/lpe-knot.h b/src/live_effects/lpe-knot.h
index 14c61a4e5..a25607981 100644
--- a/src/live_effects/lpe-knot.h
+++ b/src/live_effects/lpe-knot.h
@@ -56,7 +56,7 @@ public:
   LPEKnot(LivePathEffectObject *lpeobject);
   virtual ~LPEKnot();
   
-  virtual void doBeforeEffect (SPLPEItem *lpeitem);
+  virtual void doBeforeEffect (SPLPEItem const* lpeitem);
   virtual std::vector<Geom::Path> doEffect_path (std::vector<Geom::Path> const & input_path);
   
   /* the knotholder entity classes must be declared friends */
diff --git a/src/live_effects/lpe-lattice.cpp b/src/live_effects/lpe-lattice.cpp
index 84fba4659..8136569e8 100644
--- a/src/live_effects/lpe-lattice.cpp
+++ b/src/live_effects/lpe-lattice.cpp
@@ -173,7 +173,7 @@ LPELattice::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2
 }
 
 void
-LPELattice::doBeforeEffect (SPLPEItem *lpeitem)
+LPELattice::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     original_bbox(lpeitem);
 }
diff --git a/src/live_effects/lpe-lattice.h b/src/live_effects/lpe-lattice.h
index 521875bcf..a44dda3fd 100644
--- a/src/live_effects/lpe-lattice.h
+++ b/src/live_effects/lpe-lattice.h
@@ -31,7 +31,7 @@ public:
     LPELattice(LivePathEffectObject *lpeobject);
     virtual ~LPELattice();
 
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     virtual Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
     
diff --git a/src/live_effects/lpe-line_segment.cpp b/src/live_effects/lpe-line_segment.cpp
index 6619b85ce..2e7240e25 100644
--- a/src/live_effects/lpe-line_segment.cpp
+++ b/src/live_effects/lpe-line_segment.cpp
@@ -43,7 +43,7 @@ LPELineSegment::~LPELineSegment()
 }
 
 void
-LPELineSegment::doBeforeEffect (SPLPEItem *lpeitem)
+LPELineSegment::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     lpetool_get_limiting_bbox_corners(lpeitem->document, bboxA, bboxB);
 }
diff --git a/src/live_effects/lpe-line_segment.h b/src/live_effects/lpe-line_segment.h
index b2bb0994f..1a57688b6 100644
--- a/src/live_effects/lpe-line_segment.h
+++ b/src/live_effects/lpe-line_segment.h
@@ -32,7 +32,7 @@ public:
     LPELineSegment(LivePathEffectObject *lpeobject);
     virtual ~LPELineSegment();
 
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     virtual std::vector<Geom::Path> doEffect_path (std::vector<Geom::Path> const & path_in);
 
diff --git a/src/live_effects/lpe-parallel.cpp b/src/live_effects/lpe-parallel.cpp
index cbe3ba509..bb37fd42c 100644
--- a/src/live_effects/lpe-parallel.cpp
+++ b/src/live_effects/lpe-parallel.cpp
@@ -32,14 +32,14 @@ class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityLeftEnd(LPEParallel *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityRightEnd : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityRightEnd(LPEParallel *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 } // namespace Pl
@@ -143,16 +143,16 @@ KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*or
 }
 
 Geom::Point
-KnotHolderEntityLeftEnd::knot_get()
+KnotHolderEntityLeftEnd::knot_get() const
 {
-    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
+    LPEParallel const *lpe = dynamic_cast<LPEParallel const*>(_effect);
     return lpe->C;
 }
 
 Geom::Point
-KnotHolderEntityRightEnd::knot_get()
+KnotHolderEntityRightEnd::knot_get() const
 {
-    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
+    LPEParallel const *lpe = dynamic_cast<LPEParallel const*>(_effect);
     return lpe->D;
 }
 
diff --git a/src/live_effects/lpe-perp_bisector.cpp b/src/live_effects/lpe-perp_bisector.cpp
index 95e56f1ce..c2a25a187 100644
--- a/src/live_effects/lpe-perp_bisector.cpp
+++ b/src/live_effects/lpe-perp_bisector.cpp
@@ -38,25 +38,25 @@ class KnotHolderEntityLeftEnd : public KnotHolderEntityEnd {
 public:
     KnotHolderEntityLeftEnd(LPEPerpBisector *effect) : KnotHolderEntityEnd(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityRightEnd : public KnotHolderEntityEnd {
 public:
     KnotHolderEntityRightEnd(LPEPerpBisector *effect) : KnotHolderEntityEnd(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 Geom::Point
-KnotHolderEntityLeftEnd::knot_get() {
-    LPEPerpBisector *lpe = dynamic_cast<LPEPerpBisector *>(_effect);
+KnotHolderEntityLeftEnd::knot_get() const {
+    LPEPerpBisector const* lpe = dynamic_cast<LPEPerpBisector const*>(_effect);
     return Geom::Point(lpe->C);
 }
 
 Geom::Point
-KnotHolderEntityRightEnd::knot_get() {
-    LPEPerpBisector *lpe = dynamic_cast<LPEPerpBisector *>(_effect);
+KnotHolderEntityRightEnd::knot_get() const {
+    LPEPerpBisector const* lpe = dynamic_cast<LPEPerpBisector const*>(_effect);
     return Geom::Point(lpe->D);
 }
 
diff --git a/src/live_effects/lpe-perspective_path.cpp b/src/live_effects/lpe-perspective_path.cpp
index aeee77482..c255f8665 100644
--- a/src/live_effects/lpe-perspective_path.cpp
+++ b/src/live_effects/lpe-perspective_path.cpp
@@ -36,7 +36,7 @@ class KnotHolderEntityOffset : public LPEKnotHolderEntity
 public:
     KnotHolderEntityOffset(LPEPerspectivePath *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 } // namespace PP
@@ -71,7 +71,7 @@ LPEPerspectivePath::~LPEPerspectivePath()
 }
 
 void
-LPEPerspectivePath::doBeforeEffect (SPLPEItem *lpeitem)
+LPEPerspectivePath::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     original_bbox(lpeitem, true);
 }
@@ -165,9 +165,9 @@ KnotHolderEntityOffset::knot_set(Geom::Point const &p, Geom::Point const &origin
 }
 
 Geom::Point
-KnotHolderEntityOffset::knot_get()
+KnotHolderEntityOffset::knot_get() const
 {
-    LPEPerspectivePath* lpe = dynamic_cast<LPEPerspectivePath *>(_effect);
+    LPEPerspectivePath const *lpe = dynamic_cast<LPEPerspectivePath const*>(_effect);
     return lpe->orig + Geom::Point(lpe->offsetx, -lpe->offsety);
 }
 
diff --git a/src/live_effects/lpe-perspective_path.h b/src/live_effects/lpe-perspective_path.h
index 14321f52e..a9ee004f9 100644
--- a/src/live_effects/lpe-perspective_path.h
+++ b/src/live_effects/lpe-perspective_path.h
@@ -34,7 +34,7 @@ public:
     LPEPerspectivePath(LivePathEffectObject *lpeobject);
     virtual ~LPEPerspectivePath();
     
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
     virtual Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
 
diff --git a/src/live_effects/lpe-rough-hatches.cpp b/src/live_effects/lpe-rough-hatches.cpp
index 14b21fe39..96b0bb0ae 100644
--- a/src/live_effects/lpe-rough-hatches.cpp
+++ b/src/live_effects/lpe-rough-hatches.cpp
@@ -539,7 +539,7 @@ LPERoughHatches::smoothSnake(std::vector<std::vector<Point> > const &linearSnake
 }
 
 void
-LPERoughHatches::doBeforeEffect (SPLPEItem */*lpeitem*/)
+LPERoughHatches::doBeforeEffect (SPLPEItem const*/*lpeitem*/)
 {
     using namespace Geom;
     top_edge_variation.resetRandomizer();
diff --git a/src/live_effects/lpe-rough-hatches.h b/src/live_effects/lpe-rough-hatches.h
index 867801e74..f8454e1ea 100644
--- a/src/live_effects/lpe-rough-hatches.h
+++ b/src/live_effects/lpe-rough-hatches.h
@@ -33,7 +33,7 @@ public:
 
     virtual void resetDefaults(SPItem const* item);
 
-    virtual void doBeforeEffect(SPLPEItem * item);
+    virtual void doBeforeEffect(SPLPEItem const* item);
 
   std::vector<double>
     generateLevels(Geom::Interval const &domain, double x_org);
diff --git a/src/live_effects/lpe-skeleton.cpp b/src/live_effects/lpe-skeleton.cpp
index 65faef216..c61e9773f 100644
--- a/src/live_effects/lpe-skeleton.cpp
+++ b/src/live_effects/lpe-skeleton.cpp
@@ -95,7 +95,7 @@ class KnotHolderEntityMyHandle : public LPEKnotHolderEntity
 public:
     // the set() and get() methods must be implemented, click() is optional
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
     //virtual void knot_click(guint state);
 };
 
diff --git a/src/live_effects/lpe-sketch.cpp b/src/live_effects/lpe-sketch.cpp
index ccc508144..8ad0e616f 100644
--- a/src/live_effects/lpe-sketch.cpp
+++ b/src/live_effects/lpe-sketch.cpp
@@ -362,7 +362,7 @@ LPESketch::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_
 }
 
 void
-LPESketch::doBeforeEffect (SPLPEItem */*lpeitem*/)
+LPESketch::doBeforeEffect (SPLPEItem const*/*lpeitem*/)
 {
     //init random parameters.
     parallel_offset.resetRandomizer();
diff --git a/src/live_effects/lpe-sketch.h b/src/live_effects/lpe-sketch.h
index b95f57682..3bef0cf5e 100644
--- a/src/live_effects/lpe-sketch.h
+++ b/src/live_effects/lpe-sketch.h
@@ -31,7 +31,7 @@ public:
 
     virtual Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
 
-    virtual void doBeforeEffect (SPLPEItem *lpeitem);
+    virtual void doBeforeEffect (SPLPEItem const* lpeitem);
 
 private:
     // add the parameters for your effect here:
diff --git a/src/live_effects/lpe-tangent_to_curve.cpp b/src/live_effects/lpe-tangent_to_curve.cpp
index b40d404ae..dbebdf7fb 100644
--- a/src/live_effects/lpe-tangent_to_curve.cpp
+++ b/src/live_effects/lpe-tangent_to_curve.cpp
@@ -36,14 +36,14 @@ class KnotHolderEntityAttachPt : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityAttachPt(LPETangentToCurve *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {
 public:
     KnotHolderEntityLeftEnd(LPETangentToCurve *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 class KnotHolderEntityRightEnd : public LPEKnotHolderEntity
@@ -51,7 +51,7 @@ class KnotHolderEntityRightEnd : public LPEKnotHolderEntity
 public:
     KnotHolderEntityRightEnd(LPETangentToCurve *effect) : LPEKnotHolderEntity(effect) {};
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
 };
 
 } // namespace TtC
@@ -172,23 +172,23 @@ KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*or
 }
 
 Geom::Point
-KnotHolderEntityAttachPt::knot_get()
+KnotHolderEntityAttachPt::knot_get() const
 {
-    LPETangentToCurve* lpe = dynamic_cast<LPETangentToCurve *>(_effect);
+    LPETangentToCurve const *lpe = dynamic_cast<LPETangentToCurve const*>(_effect);
     return lpe->ptA;
 }
 
 Geom::Point
-KnotHolderEntityLeftEnd::knot_get()
+KnotHolderEntityLeftEnd::knot_get() const
 {
-    LPETangentToCurve *lpe = dynamic_cast<LPETangentToCurve *>(_effect);
+    LPETangentToCurve const *lpe = dynamic_cast<LPETangentToCurve const*>(_effect);
     return lpe->C;
 }
 
 Geom::Point
-KnotHolderEntityRightEnd::knot_get()
+KnotHolderEntityRightEnd::knot_get() const
 {
-    LPETangentToCurve *lpe = dynamic_cast<LPETangentToCurve *>(_effect);
+    LPETangentToCurve const *lpe = dynamic_cast<LPETangentToCurve const*>(_effect);
     return lpe->D;
 }
 
diff --git a/src/live_effects/lpe-vonkoch.cpp b/src/live_effects/lpe-vonkoch.cpp
index ee3daff82..f7b2beeba 100644
--- a/src/live_effects/lpe-vonkoch.cpp
+++ b/src/live_effects/lpe-vonkoch.cpp
@@ -241,7 +241,7 @@ LPEVonKoch::doEffect_path (std::vector<Geom::Path> const & path_in)
 */
 
 void
-LPEVonKoch::doBeforeEffect (SPLPEItem *lpeitem)
+LPEVonKoch::doBeforeEffect (SPLPEItem const* lpeitem)
 {
     using namespace Geom;
     original_bbox(lpeitem);
diff --git a/src/live_effects/lpe-vonkoch.h b/src/live_effects/lpe-vonkoch.h
index 1a36ab410..2ea7c8169 100644
--- a/src/live_effects/lpe-vonkoch.h
+++ b/src/live_effects/lpe-vonkoch.h
@@ -53,7 +53,7 @@ public:
 
     virtual void resetDefaults(SPItem const* item);
 
-    virtual void doBeforeEffect(SPLPEItem * item);
+    virtual void doBeforeEffect(SPLPEItem const* item);
 
     //Usefull??
     //    protected: 
diff --git a/src/live_effects/lpegroupbbox.cpp b/src/live_effects/lpegroupbbox.cpp
index e2378265a..2a1b70a6a 100644
--- a/src/live_effects/lpegroupbbox.cpp
+++ b/src/live_effects/lpegroupbbox.cpp
@@ -22,7 +22,7 @@ namespace LivePathEffect {
  *                  or of the transformed lpeitem (\c absolute = \c true) using sp_item_i2doc_affine.
  * @post Updated values of boundingbox_X and boundingbox_Y. These intervals are set to empty intervals when the precondition is not met.
  */
-void GroupBBoxEffect::original_bbox(SPLPEItem *lpeitem, bool absolute)
+void GroupBBoxEffect::original_bbox(SPLPEItem const* lpeitem, bool absolute)
 {
     // Get item bounding box
     Geom::Affine transform;
diff --git a/src/live_effects/lpegroupbbox.h b/src/live_effects/lpegroupbbox.h
index 57577d20f..cc14203d1 100644
--- a/src/live_effects/lpegroupbbox.h
+++ b/src/live_effects/lpegroupbbox.h
@@ -22,7 +22,7 @@ protected:
     Geom::Interval boundingbox_Y;
 
 	//This sets boundingbox_X and boundingbox_Y
-    void original_bbox(SPLPEItem *lpeitem, bool absolute = false);
+    void original_bbox(SPLPEItem const* lpeitem, bool absolute = false);
 };
 
 }; //namespace LivePathEffect
diff --git a/src/live_effects/parameter/originalpath.h b/src/live_effects/parameter/originalpath.h
index 7dd17edb0..b3feec41f 100644
--- a/src/live_effects/parameter/originalpath.h
+++ b/src/live_effects/parameter/originalpath.h
@@ -31,7 +31,7 @@ public:
     /** Disable the canvas indicators of parent class by overriding this method */
     virtual void param_editOncanvas(SPItem * /*item*/, SPDesktop * /*dt*/) {};
     /** Disable the canvas indicators of parent class by overriding this method */
-    virtual void addCanvasIndicators(SPLPEItem * /*lpeitem*/, std::vector<Geom::PathVector> & /*hp_vec*/) {};
+    virtual void addCanvasIndicators(SPLPEItem const* /*lpeitem*/, std::vector<Geom::PathVector> & /*hp_vec*/) {};
 
 protected:
     virtual void linked_modified_callback(SPObject *linked_obj, guint flags);
diff --git a/src/live_effects/parameter/parameter.h b/src/live_effects/parameter/parameter.h
index 526708ed7..785ada92e 100644
--- a/src/live_effects/parameter/parameter.h
+++ b/src/live_effects/parameter/parameter.h
@@ -61,7 +61,7 @@ public:
     // overload these for your particular parameter to make it provide knotholder handles or canvas helperpaths
     virtual bool providesKnotHolderEntities() const { return false; }
     virtual void addKnotHolderEntities(KnotHolder */*knotholder*/, SPDesktop */*desktop*/, SPItem */*item*/) {};
-    virtual void addCanvasIndicators(SPLPEItem */*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/) {};
+    virtual void addCanvasIndicators(SPLPEItem const*/*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/) {};
 
     virtual void param_editOncanvas(SPItem * /*item*/, SPDesktop * /*dt*/) {};
     virtual void param_setup_nodepath(Inkscape::NodePath::Path */*np*/) {};
diff --git a/src/live_effects/parameter/path.cpp b/src/live_effects/parameter/path.cpp
index d076cc5d0..eca0d7a22 100644
--- a/src/live_effects/parameter/path.cpp
+++ b/src/live_effects/parameter/path.cpp
@@ -231,7 +231,7 @@ PathParam::param_setup_nodepath(Inkscape::NodePath::Path *)
 }
 
 void
-PathParam::addCanvasIndicators(SPLPEItem */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
+PathParam::addCanvasIndicators(SPLPEItem const*/*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
 {
     hp_vec.push_back(_pathvector);
 }
diff --git a/src/live_effects/parameter/path.h b/src/live_effects/parameter/path.h
index d48b5422d..112a1ea13 100644
--- a/src/live_effects/parameter/path.h
+++ b/src/live_effects/parameter/path.h
@@ -46,7 +46,7 @@ public:
 
     virtual void param_editOncanvas(SPItem * item, SPDesktop * dt);
     virtual void param_setup_nodepath(Inkscape::NodePath::Path *np);
-    virtual void addCanvasIndicators(SPLPEItem *lpeitem, std::vector<Geom::PathVector> &hp_vec);
+    virtual void addCanvasIndicators(SPLPEItem const* lpeitem, std::vector<Geom::PathVector> &hp_vec);
 
     virtual void param_transform_multiply(Geom::Affine const& /*postmul*/, bool /*set*/);
 
diff --git a/src/live_effects/parameter/point.cpp b/src/live_effects/parameter/point.cpp
index 2be87e048..53866f278 100644
--- a/src/live_effects/parameter/point.cpp
+++ b/src/live_effects/parameter/point.cpp
@@ -133,7 +133,7 @@ public:
     virtual ~PointParamKnotHolderEntity() {}
 
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
     virtual void knot_click(guint state);
 
 private:
@@ -149,7 +149,7 @@ PointParamKnotHolderEntity::knot_set(Geom::Point const &p, Geom::Point const &/*
 }
 
 Geom::Point
-PointParamKnotHolderEntity::knot_get()
+PointParamKnotHolderEntity::knot_get() const
 {
     return *pparam;
 }
diff --git a/src/live_effects/parameter/powerstrokepointarray.cpp b/src/live_effects/parameter/powerstrokepointarray.cpp
index 93161ec0d..fecdfeda8 100644
--- a/src/live_effects/parameter/powerstrokepointarray.cpp
+++ b/src/live_effects/parameter/powerstrokepointarray.cpp
@@ -124,11 +124,11 @@ public:
     virtual ~PowerStrokePointArrayParamKnotHolderEntity() {}
 
     virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
-    virtual Geom::Point knot_get();
+    virtual Geom::Point knot_get() const;
     virtual void knot_click(guint state);
 
     /** Checks whether the index falls within the size of the parameter's vector */
-    bool valid_index(unsigned int index) {
+    bool valid_index(unsigned int index) const {
         return (_pparam->_vector.size() > index);
     };
 
@@ -164,7 +164,7 @@ PowerStrokePointArrayParamKnotHolderEntity::knot_set(Geom::Point const &p, Geom:
 }
 
 Geom::Point
-PowerStrokePointArrayParamKnotHolderEntity::knot_get()
+PowerStrokePointArrayParamKnotHolderEntity::knot_get() const
 {
     using namespace Geom;
 
diff --git a/src/live_effects/parameter/vector.cpp b/src/live_effects/parameter/vector.cpp
index a20c46042..edd6b863f 100644
--- a/src/live_effects/parameter/vector.cpp
+++ b/src/live_effects/parameter/vector.cpp
@@ -154,7 +154,7 @@ public:
         param->setOrigin(s);
         sp_lpe_item_update_patheffect(SP_LPE_ITEM(item), false, false);
     };
-    virtual Geom::Point knot_get(){
+    virtual Geom::Point knot_get() const {
         return param->origin;
     };
     virtual void knot_click(guint /*state*/){
@@ -176,7 +176,7 @@ public:
         param->setVector(s);
         sp_lpe_item_update_patheffect(SP_LPE_ITEM(item), false, false);
     };
-    virtual Geom::Point knot_get(){
+    virtual Geom::Point knot_get() const {
         return param->origin + param->vector;
     };
     virtual void knot_click(guint /*state*/){