From 7867b2ae755a4217c14365e3b1b18484ba98712b Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Sat, 7 Apr 2012 16:09:58 +0200
Subject: cleanup knotholder code for LPEs

(bzr r11170)
---
 src/live_effects/lpe-parallel.cpp | 59 ++++++++++++++++++++++-----------------
 1 file changed, 33 insertions(+), 26 deletions(-)

(limited to 'src/live_effects/lpe-parallel.cpp')

diff --git a/src/live_effects/lpe-parallel.cpp b/src/live_effects/lpe-parallel.cpp
index 5b373442b..4d15bf13e 100644
--- a/src/live_effects/lpe-parallel.cpp
+++ b/src/live_effects/lpe-parallel.cpp
@@ -6,7 +6,7 @@
  * Authors:
  *   Maximilian Albert
  *
- * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ * Copyright (C) Johan Engelen 2007-2012 <j.b.c.engelen@alumnus.utwente.nl>
  * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
  *
  * Released under GNU GPL, read the file 'COPYING' for more information
@@ -19,21 +19,24 @@
 #include <2geom/path.h>
 #include <2geom/transforms.h>
 
+#include "knot-holder-entity.h"
+#include "knotholder.h"
+
 namespace Inkscape {
 namespace LivePathEffect {
 
 namespace Pl {
 
-class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity
-{
+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();
 };
 
-class KnotHolderEntityRightEnd : public LPEKnotHolderEntity
-{
+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();
 };
@@ -48,13 +51,11 @@ LPEParallel::LPEParallel(LivePathEffectObject *lpeobject) :
     length_right(_("Length right"), _("Specifies the right end of the parallel"), "length-right", &wr, this, 150)
 {
     show_orig_path = true;
+    _provides_knotholder_entities = true;
 
     registerParameter(dynamic_cast<Parameter *>(&offset_pt));
     registerParameter( dynamic_cast<Parameter *>(&length_left) );
     registerParameter( dynamic_cast<Parameter *>(&length_right) );
-
-    registerKnotHolderHandle(new Pl::KnotHolderEntityLeftEnd(), _("Adjust the \"left\" end of the parallel"));
-    registerKnotHolderHandle(new Pl::KnotHolderEntityRightEnd(), _("Adjust the \"right\" end of the parallel"));
 }
 
 LPEParallel::~LPEParallel()
@@ -93,27 +94,33 @@ LPEParallel::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd
     return output + dir;
 }
 
-namespace Pl {
-
-// TODO: make this more generic
-static LPEParallel *
-get_effect(SPItem *item)
-{
-    Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
-    if (effect->effectType() != PARALLEL) {
-        g_print ("Warning: Effect is not of type LPEParallel!\n");
-        return NULL;
+void
+LPEParallel::addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {
+    {
+        KnotHolderEntity *e = new Pl::KnotHolderEntityLeftEnd(this);
+        e->create(  desktop, item, knotholder,
+                    _("Adjust the \"left\" end of the parallel")
+                    /*optional: knot_shape, knot_mode, knot_color*/);
+        knotholder->add(e);
     }
-    return static_cast<LPEParallel *>(effect);
-}
+    {
+        KnotHolderEntity *e = new Pl::KnotHolderEntityRightEnd(this);
+        e->create(  desktop, item, knotholder,
+                    _("Adjust the \"right\" end of the parallel")
+                    /*optional: knot_shape, knot_mode, knot_color*/);
+        knotholder->add(e);
+    }
+};
+
+namespace Pl {
 
 void
 KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint /*state*/)
 {
     using namespace Geom;
 
-    LPEParallel *lpe = get_effect(item);
-    
+    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
+
     Geom::Point const s = snap_knot_position(p);
 
     double lambda = L2(s - lpe->offset_pt) * sgn(dot(s - lpe->offset_pt, lpe->dir));
@@ -127,8 +134,8 @@ KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*or
 {
     using namespace Geom;
 
-    LPEParallel *lpe = get_effect(item);
-    
+    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
+
     Geom::Point const s = snap_knot_position(p);
 
     double lambda = L2(s - lpe->offset_pt) * sgn(dot(s - lpe->offset_pt, lpe->dir));
@@ -140,14 +147,14 @@ KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*or
 Geom::Point
 KnotHolderEntityLeftEnd::knot_get()
 {
-    LPEParallel *lpe = get_effect(item);
+    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
     return lpe->C;
 }
 
 Geom::Point
 KnotHolderEntityRightEnd::knot_get()
 {
-    LPEParallel *lpe = get_effect(item);
+    LPEParallel *lpe = dynamic_cast<LPEParallel *>(_effect);
     return lpe->D;
 }
 
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