Move states into subfolder
[synfig.git] / synfig-studio / src / gui / states / state_bline.cpp
diff --git a/synfig-studio/src/gui/states/state_bline.cpp b/synfig-studio/src/gui/states/state_bline.cpp
new file mode 100644 (file)
index 0000000..ee0ca20
--- /dev/null
@@ -0,0 +1,1414 @@
+/* === S Y N F I G ========================================================= */
+/*!    \file state_bline.cpp
+**     \brief Template File
+**
+**     $Id$
+**
+**     \legal
+**     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**     Copyright (c) 2007, 2008 Chris Moore
+**
+**     This package is free software; you can redistribute it and/or
+**     modify it under the terms of the GNU General Public License as
+**     published by the Free Software Foundation; either version 2 of
+**     the License, or (at your option) any later version.
+**
+**     This package is distributed in the hope that it will be useful,
+**     but WITHOUT ANY WARRANTY; without even the implied warranty of
+**     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+**     General Public License for more details.
+**     \endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+#      include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+#      include <config.h>
+#endif
+
+#include <gtkmm/dialog.h>
+#include <gtkmm/entry.h>
+
+#include <synfig/valuenode_dynamiclist.h>
+
+#include "state_bline.h"
+#include "state_normal.h"
+#include "canvasview.h"
+#include "workarea.h"
+#include "app.h"
+#include <synfig/valuenode_bline.h>
+#include <ETL/hermite>
+#include <ETL/calculus>
+#include <utility>
+#include "event_mouse.h"
+#include "event_layerclick.h"
+#include "toolbox.h"
+#include "dialog_tooloptions.h"
+#include <gtkmm/spinbutton.h>
+#include <synfig/transform.h>
+#include <synfigapp/main.h>
+
+#include "general.h"
+
+#endif
+
+/* === U S I N G =========================================================== */
+
+using namespace std;
+using namespace etl;
+using namespace synfig;
+using namespace studio;
+
+/* === M A C R O S ========================================================= */
+
+// if defined, show the first duck as green while drawing
+#define DISTINGUISH_FIRST_DUCK
+
+/* === G L O B A L S ======================================================= */
+
+StateBLine studio::state_bline;
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+class studio::StateBLine_Context : public sigc::trackable
+{
+       etl::handle<CanvasView> canvas_view_;
+       CanvasView::IsWorking is_working;
+
+       bool prev_table_status;
+       bool loop_;
+       bool prev_workarea_layer_status_;
+
+       int depth;
+       Canvas::Handle canvas;
+
+       Gtk::Menu menu;
+
+       Duckmatic::Push duckmatic_push;
+
+       etl::handle<Duck> curr_duck;
+
+       etl::handle<Duck> next_duck;
+
+       std::list<synfig::ValueNode_Const::Handle> bline_point_list;
+       synfigapp::Settings& settings;
+
+       bool on_vertex_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node);
+       bool on_tangent1_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node);
+       bool on_tangent2_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node);
+
+
+       void popup_handle_menu(synfig::ValueNode_Const::Handle value_node);
+       void popup_vertex_menu(synfig::ValueNode_Const::Handle value_node);
+       void popup_bezier_menu(float location, synfig::ValueNode_Const::Handle value_node);
+
+       void bline_detach_handle(synfig::ValueNode_Const::Handle value_node);
+       void bline_attach_handle(synfig::ValueNode_Const::Handle value_node);
+       void bline_delete_vertex(synfig::ValueNode_Const::Handle value_node);
+       void bline_insert_vertex(synfig::ValueNode_Const::Handle value_node,float origin=0.5);
+       void loop_bline();
+       void unloop_bline();
+
+       void refresh_ducks(bool x=true);
+
+       Gtk::Table options_table;
+       Gtk::Entry entry_id;
+       Gtk::CheckButton checkbutton_layer_region;
+       Gtk::CheckButton checkbutton_layer_outline;
+       Gtk::CheckButton checkbutton_layer_curve_gradient;
+       Gtk::CheckButton checkbutton_layer_plant;
+       Gtk::CheckButton checkbutton_layer_link_origins;
+       Gtk::CheckButton checkbutton_auto_export;
+       Gtk::Button button_make;
+       Gtk::Button button_clear;
+       Gtk::Adjustment  adj_feather;
+       Gtk::SpinButton  spin_feather;
+
+
+
+public:
+
+       int layers_to_create()const
+       {
+               return
+                       get_layer_region_flag() +
+                       get_layer_outline_flag() +
+                       get_layer_curve_gradient_flag() +
+                       get_layer_plant_flag();
+       }
+
+       void sanity_check()
+       {
+               if(layers_to_create()==0)
+                       set_layer_region_flag(true);
+       }
+
+       bool get_auto_export_flag()const { return checkbutton_auto_export.get_active(); }
+       void set_auto_export_flag(bool x) { return checkbutton_auto_export.set_active(x); }
+
+       bool get_layer_region_flag()const { return checkbutton_layer_region.get_active(); }
+       void set_layer_region_flag(bool x) { return checkbutton_layer_region.set_active(x); }
+
+       bool get_layer_outline_flag()const { return checkbutton_layer_outline.get_active(); }
+       void set_layer_outline_flag(bool x) { return checkbutton_layer_outline.set_active(x); }
+
+       bool get_layer_curve_gradient_flag()const { return checkbutton_layer_curve_gradient.get_active(); }
+       void set_layer_curve_gradient_flag(bool x) { return checkbutton_layer_curve_gradient.set_active(x); }
+
+       bool get_layer_plant_flag()const { return checkbutton_layer_plant.get_active(); }
+       void set_layer_plant_flag(bool x) { return checkbutton_layer_plant.set_active(x); }
+
+       bool get_layer_link_origins_flag()const { return checkbutton_layer_link_origins.get_active(); }
+       void set_layer_link_origins_flag(bool x) { return checkbutton_layer_link_origins.set_active(x); }
+
+       Real get_feather() const { return adj_feather.get_value(); }
+       void set_feather(Real x) { return adj_feather.set_value(x); }
+       synfig::String get_id()const { return entry_id.get_text(); }
+       void set_id(const synfig::String& x) { return entry_id.set_text(x); }
+
+       Smach::event_result event_stop_handler(const Smach::event& x);
+
+       Smach::event_result event_refresh_handler(const Smach::event& x);
+
+       Smach::event_result event_mouse_click_handler(const Smach::event& x);
+       Smach::event_result event_mouse_release_handler(const Smach::event& x);
+       Smach::event_result event_mouse_motion_handler(const Smach::event& x);
+       Smach::event_result event_refresh_tool_options(const Smach::event& x);
+
+       Smach::event_result event_hijack(const Smach::event& /*x*/) { return Smach::RESULT_ACCEPT; }
+
+       void refresh_tool_options();
+
+       StateBLine_Context(CanvasView* canvas_view);
+
+       ~StateBLine_Context();
+
+       const etl::handle<CanvasView>& get_canvas_view()const{return canvas_view_;}
+       etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const{return canvas_view_->canvas_interface();}
+       synfig::Canvas::Handle get_canvas()const{return canvas_view_->get_canvas();}
+       WorkArea * get_work_area()const{return canvas_view_->get_work_area();}
+       const synfig::TransformStack& get_transform_stack()const { return canvas_view_->get_curr_transform_stack(); }
+
+       void load_settings();
+       void save_settings();
+       void reset();
+       void increment_id();
+       //void on_user_click(synfig::Point point);
+
+       bool run_();
+       bool run();
+
+       bool egress_on_selection_change;
+       Smach::event_result event_layer_selection_changed_handler(const Smach::event& /*x*/)
+       {
+               if(egress_on_selection_change)
+                       throw &state_normal; //throw Smach::egress_exception();
+               return Smach::RESULT_OK;
+       }
+
+};     // END of class StateBLine_Context
+
+
+/* === M E T H O D S ======================================================= */
+
+StateBLine::StateBLine():
+       Smach::state<StateBLine_Context>("bline")
+{
+       insert(event_def(EVENT_LAYER_SELECTION_CHANGED,         &StateBLine_Context::event_layer_selection_changed_handler));
+       insert(event_def(EVENT_STOP,                                            &StateBLine_Context::event_stop_handler));
+       insert(event_def(EVENT_REFRESH,                                         &StateBLine_Context::event_refresh_handler));
+       insert(event_def(EVENT_REFRESH_DUCKS,                           &StateBLine_Context::event_hijack));
+       insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,      &StateBLine_Context::event_mouse_click_handler));
+       insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_UP,        &StateBLine_Context::event_mouse_release_handler));
+       insert(event_def(EVENT_WORKAREA_MOUSE_MOTION,           &StateBLine_Context::event_mouse_motion_handler));
+       insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,      &StateBLine_Context::event_mouse_motion_handler));
+       insert(event_def(EVENT_REFRESH_TOOL_OPTIONS,            &StateBLine_Context::event_refresh_tool_options));
+}
+
+StateBLine::~StateBLine()
+{
+}
+
+void
+StateBLine_Context::load_settings()
+{
+       String value;
+
+       if(settings.get_value("bline.layer_region",value) && value=="0")
+               set_layer_region_flag(false);
+       else
+               set_layer_region_flag(true);
+
+       if(settings.get_value("bline.layer_outline",value) && value=="0")
+               set_layer_outline_flag(false);
+       else
+               set_layer_outline_flag(true);
+
+       if(settings.get_value("bline.layer_curve_gradient",value) && value=="1")
+               set_layer_curve_gradient_flag(true);
+       else
+               set_layer_curve_gradient_flag(false);
+
+       if(settings.get_value("bline.layer_plant",value) && value=="1")
+               set_layer_plant_flag(true);
+       else
+               set_layer_plant_flag(false);
+
+       if(settings.get_value("bline.layer_link_origins",value) && value=="0")
+               set_layer_link_origins_flag(false);
+       else
+               set_layer_link_origins_flag(true);
+
+       if(settings.get_value("bline.auto_export",value) && value=="1")
+               set_auto_export_flag(true);
+       else
+               set_auto_export_flag(false);
+
+       if(settings.get_value("bline.id",value))
+               set_id(value);
+       else
+               set_id("NewBLine");
+
+       if(settings.get_value("bline.feather",value))
+       {
+               Real n = atof(value.c_str());
+               set_feather(n);
+       }
+
+       sanity_check();
+}
+
+void
+StateBLine_Context::save_settings()
+{
+       sanity_check();
+       settings.set_value("bline.layer_outline",get_layer_outline_flag()?"1":"0");
+       settings.set_value("bline.layer_region",get_layer_region_flag()?"1":"0");
+       settings.set_value("bline.layer_curve_gradient",get_layer_curve_gradient_flag()?"1":"0");
+       settings.set_value("bline.layer_plant",get_layer_plant_flag()?"1":"0");
+       settings.set_value("bline.layer_link_origins",get_layer_link_origins_flag()?"1":"0");
+       settings.set_value("bline.auto_export",get_auto_export_flag()?"1":"0");
+       settings.set_value("bline.id",get_id().c_str());
+       settings.set_value("bline.feather",strprintf("%f",get_feather()));
+}
+
+void
+StateBLine_Context::reset()
+{
+       loop_=false;
+       bline_point_list.clear();
+       refresh_ducks();
+}
+
+void
+StateBLine_Context::increment_id()
+{
+       String id(get_id());
+       int number=1;
+       int digits=0;
+
+       if(id.empty())
+               id="NewBLine";
+
+       // If there is a number
+       // already at the end of the
+       // id, then remove it.
+       if(id[id.size()-1]<='9' && id[id.size()-1]>='0')
+       {
+               // figure out how many digits it is
+               for (digits = 0;
+                        (int)id.size()-1 >= digits && id[id.size()-1-digits] <= '9' && id[id.size()-1-digits] >= '0';
+                        digits++)
+                       ;
+
+               String str_number;
+               str_number=String(id,id.size()-digits,id.size());
+               id=String(id,0,id.size()-digits);
+               // synfig::info("---------------- \"%s\"",str_number.c_str());
+
+               number=atoi(str_number.c_str());
+       }
+       else
+       {
+               number=1;
+               digits=3;
+       }
+
+       number++;
+
+       // Add the number back onto the id
+       {
+               const String format(strprintf("%%0%dd",digits));
+               id+=strprintf(format.c_str(),number);
+       }
+
+       // Set the ID
+       set_id(id);
+}
+
+
+StateBLine_Context::StateBLine_Context(CanvasView* canvas_view):
+       canvas_view_(canvas_view),
+       is_working(*canvas_view),
+       loop_(false),
+       prev_workarea_layer_status_(get_work_area()->get_allow_layer_clicks()),
+       duckmatic_push(get_work_area()),
+       settings(synfigapp::Main::get_selected_input_device()->settings()),
+       entry_id(),
+       checkbutton_layer_region(_("Create Region BLine")),
+       checkbutton_layer_outline(_("Create Outline BLine")),
+       checkbutton_layer_curve_gradient(_("Create Curve Gradient BLine")),
+       checkbutton_layer_plant(_("Create Plant BLine")),
+       checkbutton_layer_link_origins(_("Link Origins")),
+       checkbutton_auto_export(_("Auto Export")),
+       button_make(_("Make")),
+       button_clear(_("Clear")),
+       adj_feather(0,0,10000,0.01,0.1),
+       spin_feather(adj_feather,0.01,4)
+{
+       depth=-1;
+       egress_on_selection_change=true;
+       load_settings();
+
+       // Set up the tool options dialog
+       options_table.attach(*manage(new Gtk::Label(_("BLine Tool"))),  0, 2,  0,  1, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(entry_id,                                                                  0, 2,  1,  2, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_layer_outline,                                 0, 2,  2,  3, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_layer_region,                                  0, 2,  3,  4, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_layer_plant,                                   0, 2,  4,  5, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_layer_curve_gradient,                  0, 2,  5,  6, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_layer_link_origins,                    0, 2,  6,  7, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(checkbutton_auto_export,                                   0, 2,  7,  8, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(*manage(new Gtk::Label(_("Feather"))),     0, 1, 10, 11, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       options_table.attach(spin_feather,                                                              1, 2, 10, 11, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       //options_table.attach(button_make, 0, 2, 5, 6, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
+       //button_make.signal_pressed().connect(sigc::mem_fun(*this,&StateBLine_Context::run));
+       options_table.show_all();
+       refresh_tool_options();
+       App::dialog_tool_options->present();
+
+       // Turn off layer clicking
+       get_work_area()->set_allow_layer_clicks(false);
+
+       // clear out the ducks
+       get_work_area()->clear_ducks();
+
+       // Refresh the work area
+       get_work_area()->queue_draw();
+
+       // Hide the tables if they are showing
+       prev_table_status=get_canvas_view()->tables_are_visible();
+       if(prev_table_status)get_canvas_view()->hide_tables();
+
+       // Disable the time bar
+       get_canvas_view()->set_sensitive_timebar(false);
+
+       // Connect a signal
+       //get_work_area()->signal_user_click().connect(sigc::mem_fun(*this,&studio::StateBLine_Context::on_user_click));
+       get_work_area()->set_cursor(Gdk::CROSSHAIR);
+
+       App::toolbox->refresh();
+}
+
+void
+StateBLine_Context::refresh_tool_options()
+{
+       App::dialog_tool_options->clear();
+       App::dialog_tool_options->set_widget(options_table);
+       App::dialog_tool_options->set_local_name(_("BLine Tool"));
+       App::dialog_tool_options->set_name("bline");
+
+       App::dialog_tool_options->add_button(
+               Gtk::StockID("gtk-execute"),
+               _("Make BLine and/or Region")
+       )->signal_clicked().connect(
+               sigc::hide_return(sigc::mem_fun(
+                       *this,
+                       &StateBLine_Context::run
+               ))
+       );
+
+       App::dialog_tool_options->add_button(
+               Gtk::StockID("gtk-clear"),
+               _("Clear current BLine")
+       )->signal_clicked().connect(
+               sigc::mem_fun(
+                       *this,
+                       &StateBLine_Context::reset
+               )
+       );
+}
+
+Smach::event_result
+StateBLine_Context::event_refresh_tool_options(const Smach::event& /*x*/)
+{
+       refresh_tool_options();
+       return Smach::RESULT_ACCEPT;
+}
+
+StateBLine_Context::~StateBLine_Context()
+{
+       run();
+
+       save_settings();
+       App::dialog_tool_options->clear();
+
+       get_work_area()->reset_cursor();
+
+       // Restore layer clicking
+       get_work_area()->set_allow_layer_clicks(prev_workarea_layer_status_);
+
+       // Enable the time bar
+       get_canvas_view()->set_sensitive_timebar(true);
+
+       // Bring back the tables if they were out before
+       if(prev_table_status)get_canvas_view()->show_tables();
+
+//     get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
+
+       // Refresh the work area
+       get_work_area()->queue_draw();
+
+       App::toolbox->refresh();
+}
+
+Smach::event_result
+StateBLine_Context::event_stop_handler(const Smach::event& /*x*/)
+{
+//     synfig::info("STATE RotoBLine: Received Stop Event");
+//     run();
+       reset();
+//     throw Smach::egress_exception();
+//     get_canvas_view()->get_smach().pop_state();
+       return Smach::RESULT_ACCEPT;
+}
+
+Smach::event_result
+StateBLine_Context::event_refresh_handler(const Smach::event& /*x*/)
+{
+//     synfig::info("STATE RotoBLine: Received Refresh Event");
+       refresh_ducks();
+       return Smach::RESULT_ACCEPT;
+}
+
+bool
+StateBLine_Context::run()
+{
+       sanity_check();
+
+       String err;
+       bool success(false);
+       for(int i=5;i>0 && !success;i--)try
+       {
+               success=run_();
+       }
+       catch(String s)
+       {
+               err=s;
+       }
+       if(!success && !err.empty())
+       {
+               get_canvas_view()->get_ui_interface()->error(err);
+       }
+       return success;
+}
+
+bool
+StateBLine_Context::run_()
+{
+       curr_duck=0;
+       next_duck=0;
+
+       // Now we need to generate it
+
+       if(bline_point_list.empty())
+       {
+               return false;
+       }
+       if(bline_point_list.size()<2)
+       {
+               //get_canvas_view()->get_ui_interface()->error(_("You need at least two (2) points to create a BLine"));
+               return false;
+       }
+
+       do
+       {
+
+               // Create the action group
+               synfigapp::Action::PassiveGrouper group(get_canvas_interface()->get_instance().get(),_("New BLine"));
+
+               std::vector<BLinePoint> new_list;
+               std::list<synfig::ValueNode_Const::Handle>::iterator iter;
+               const synfig::TransformStack& transform(get_transform_stack());
+
+               for(iter=bline_point_list.begin();iter!=bline_point_list.end();++iter)
+               {
+                       BLinePoint bline_point((*iter)->get_value().get(BLinePoint()));
+                       Point new_vertex(transform.unperform(bline_point.get_vertex()));
+
+                       bline_point.set_tangent1(
+                               transform.unperform(
+                                       bline_point.get_tangent1()+bline_point.get_vertex()
+                               ) -new_vertex
+                       );
+
+                       bline_point.set_tangent2(
+                               transform.unperform(
+                                       bline_point.get_tangent2()+bline_point.get_vertex()
+                               ) -new_vertex
+                       );
+
+                       bline_point.set_vertex(new_vertex);
+
+                       new_list.push_back(bline_point);
+               }
+
+               ValueNode_BLine::Handle value_node_bline(ValueNode_BLine::create(new_list));
+               assert(value_node_bline);
+
+               ValueNode_Const::Handle value_node_origin(ValueNode_Const::create(Vector()));
+               assert(value_node_origin);
+
+               // Set the looping flag
+               value_node_bline->set_loop(loop_);
+
+               // Add the BLine to the canvas
+               if(get_auto_export_flag() && !get_canvas_interface()->add_value_node(value_node_bline,get_id()))
+               {
+                       //get_canvas_view()->get_ui_interface()->error(_("Unable to add value node"));
+                       group.cancel();
+                       increment_id();
+                       throw String(_("Unable to add value node"));
+                       return false;
+               }
+
+               Layer::Handle layer;
+
+               // we are temporarily using the layer to hold something
+               layer=get_canvas_view()->get_selection_manager()->get_selected_layer();
+
+               if(layer)
+               {
+                       if(depth<0)
+                               depth=layer->get_depth();
+                       if(!canvas)
+                               canvas=layer->get_canvas();
+               }
+               else
+                       depth=0;
+
+               if(!canvas)
+                       canvas=get_canvas_view()->get_canvas();
+
+               value_node_bline->set_member_canvas(canvas);
+
+               synfigapp::SelectionManager::LayerList layer_selection;
+               if (!getenv("SYNFIG_TOOLS_CLEAR_SELECTION"))
+                       layer_selection = get_canvas_view()->get_selection_manager()->get_selected_layers();
+
+               // count how many layers we're going to be creating
+               int layers_to_create = this->layers_to_create();
+
+               ///////////////////////////////////////////////////////////////////////////
+               //   C U R V E   G R A D I E N T
+               ///////////////////////////////////////////////////////////////////////////
+
+               if(get_layer_curve_gradient_flag())
+               {
+                       synfigapp::PushMode push_mode(get_canvas_interface(),synfigapp::MODE_NORMAL);
+
+                       Layer::Handle layer(get_canvas_interface()->add_layer_to("curve_gradient",canvas,depth));
+                       if (!layer)
+                       {
+                               group.cancel();
+                               throw String(_("Unable to create layer"));
+                       }
+                       layer_selection.push_back(layer);
+                       layer->set_description(get_id()+_(" Gradient"));
+                       get_canvas_interface()->signal_layer_new_description()(layer,layer->get_description());
+
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("bline")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_bline)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Gradient layer"));
+                                       return false;
+                               }
+                       }
+
+                       // only link the curve gradient's origin parameter if the option is selected and we're creating more than one layer
+                       if (get_layer_link_origins_flag() && layers_to_create > 1)
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("origin")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_origin)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Gradient layer"));
+                                       return false;
+                               }
+                       }
+               }
+
+               ///////////////////////////////////////////////////////////////////////////
+               //   P L A N T
+               ///////////////////////////////////////////////////////////////////////////
+
+               if(get_layer_plant_flag())
+               {
+                       synfigapp::PushMode push_mode(get_canvas_interface(),synfigapp::MODE_NORMAL);
+
+                       Layer::Handle layer(get_canvas_interface()->add_layer_to("plant",canvas,depth));
+                       if (!layer)
+                       {
+                               group.cancel();
+                               throw String(_("Unable to create layer"));
+                       }
+                       layer_selection.push_back(layer);
+                       layer->set_description(get_id()+_(" Plant"));
+                       get_canvas_interface()->signal_layer_new_description()(layer,layer->get_description());
+
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("bline")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_bline)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Plant layer"));
+                                       return false;
+                               }
+                       }
+
+                       // only link the plant's origin parameter if the option is selected and we're creating more than one layer
+                       if (get_layer_link_origins_flag() && layers_to_create > 1)
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("origin")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_origin)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Plant layer"));
+                                       return false;
+                               }
+                       }
+               }
+
+               ///////////////////////////////////////////////////////////////////////////
+               //   R E G I O N
+               ///////////////////////////////////////////////////////////////////////////
+
+               if(get_layer_region_flag())
+               {
+                       synfigapp::PushMode push_mode(get_canvas_interface(),synfigapp::MODE_NORMAL);
+
+                       Layer::Handle layer(get_canvas_interface()->add_layer_to("region",canvas,depth));
+                       if (!layer)
+                       {
+                               group.cancel();
+                               throw String(_("Unable to create layer"));
+                       }
+                       layer_selection.push_back(layer);
+                       layer->set_description(get_id()+_(" Region"));
+                       get_canvas_interface()->signal_layer_new_description()(layer,layer->get_description());
+
+                       if(get_feather())
+                       {
+                               layer->set_param("feather",get_feather());
+                               get_canvas_interface()->signal_layer_param_changed()(layer,"feather");
+                       }
+
+                       // I don't know if it's safe to reuse the same LayerParamConnect action, so I'm
+                       // using 2 separate ones.
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("bline")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_bline)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create Region layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Region layer"));
+                                       return false;
+                               }
+                       }
+
+                       // only link the region's origin parameter if the option is selected and we're creating more than one layer
+                       if (get_layer_link_origins_flag() && layers_to_create > 1)
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("origin")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_origin)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create Region layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Region layer"));
+                                       return false;
+                               }
+                       }
+               }
+
+               ///////////////////////////////////////////////////////////////////////////
+               //   O U T L I N E
+               ///////////////////////////////////////////////////////////////////////////
+
+               if(get_layer_outline_flag())
+               {
+                       synfigapp::PushMode push_mode(get_canvas_interface(),synfigapp::MODE_NORMAL);
+
+                       Layer::Handle layer(get_canvas_interface()->add_layer_to("outline",canvas,depth));
+                       if (!layer)
+                       {
+                               group.cancel();
+                               throw String(_("Unable to create layer"));
+                       }
+                       layer_selection.push_back(layer);
+                       layer->set_description(get_id()+_(" Outline"));
+                       get_canvas_interface()->signal_layer_new_description()(layer,layer->get_description());
+                       if(get_feather())
+                       {
+                               layer->set_param("feather",get_feather());
+                               get_canvas_interface()->signal_layer_param_changed()(layer,"feather");
+                       }
+
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("bline")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_bline)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Outline layer"));
+                                       return false;
+                               }
+                       }
+
+                       // only link the outline's origin parameter if the option is selected and we're creating more than one layer
+                       if (get_layer_link_origins_flag() && layers_to_create > 1)
+                       {
+                               synfigapp::Action::Handle action(synfigapp::Action::create("LayerParamConnect"));
+                               assert(action);
+
+                               action->set_param("canvas",get_canvas());
+                               action->set_param("canvas_interface",get_canvas_interface());
+                               action->set_param("layer",layer);
+                               if(!action->set_param("param",String("origin")))
+                                       synfig::error("LayerParamConnect didn't like \"param\"");
+                               if(!action->set_param("value_node",ValueNode::Handle(value_node_origin)))
+                                       synfig::error("LayerParamConnect didn't like \"value_node\"");
+
+                               if(!get_canvas_interface()->get_instance()->perform_action(action))
+                               {
+                                       //get_canvas_view()->get_ui_interface()->error(_("Unable to create BLine layer"));
+                                       group.cancel();
+                                       throw String(_("Unable to create Outline layer"));
+                                       return false;
+                               }
+                       }
+               }
+
+               egress_on_selection_change=false;
+               get_canvas_interface()->get_selection_manager()->clear_selected_layers();
+               get_canvas_interface()->get_selection_manager()->set_selected_layers(layer_selection);
+               egress_on_selection_change=true;
+
+               //if(finish_bline_dialog.get_region_flag() || finish_bline_dialog.get_bline_flag())
+               //      get_canvas_interface()->signal_dirty_preview()();
+
+       } while(0);
+
+       reset();
+       increment_id();
+       return true;
+}
+
+Smach::event_result
+StateBLine_Context::event_mouse_motion_handler(const Smach::event& x)
+{
+       const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
+
+       if(curr_duck)
+       {
+               //synfig::info("Moved Duck");
+               Point p(get_work_area()->snap_point_to_grid(event.pos));
+               curr_duck->set_trans_point(p);
+               if(next_duck)
+                       next_duck->set_trans_point(p);
+               get_work_area()->queue_draw();
+               return Smach::RESULT_ACCEPT;
+       }
+
+       return Smach::RESULT_OK;
+}
+
+Smach::event_result
+StateBLine_Context::event_mouse_release_handler(const Smach::event& /*x*/)
+{
+       if(curr_duck)
+       {
+               //synfig::info("Released current duck");
+               curr_duck->signal_edited()(curr_duck->get_point());
+               if(next_duck)
+               {
+                       //synfig::info("grabbing next duck");
+                       curr_duck=next_duck;
+                       next_duck=0;
+               }
+               return Smach::RESULT_ACCEPT;
+       }
+       return Smach::RESULT_OK;
+}
+
+Smach::event_result
+StateBLine_Context::event_mouse_click_handler(const Smach::event& x)
+{
+       // synfig::info("STATE BLINE: Received mouse button down Event");
+       const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
+       switch(event.button)
+       {
+       case BUTTON_LEFT:
+               {
+                       // If we are already looped up, then don't try to add anything else
+                       if(loop_)
+                               return Smach::RESULT_OK;
+
+                       BLinePoint bline_point;
+
+                       bline_point.set_vertex(get_work_area()->snap_point_to_grid(event.pos));
+                       //bline_point.set_width(synfigapp::Main::get_bline_width());
+                       bline_point.set_width(1.0f);
+                       bline_point.set_origin(0.5f);
+                       bline_point.set_split_tangent_flag(false);
+                       bline_point.set_tangent1(Vector(0,0));
+
+                       // set the tangent
+                       /*
+                       if(bline_point_list.empty())
+                       {
+                               bline_point.set_tangent1(Vector(1,1));
+                       }
+                       else
+                       {
+                               const Vector t(event.pos-bline_point_list.back()->get_value().get(BLinePoint()).get_vertex());
+                               bline_point.set_tangent1(t);
+                       }
+
+                       if(bline_point_list.size()>1)
+                       {
+                               std::list<synfig::ValueNode_Const::Handle>::iterator iter;
+                               iter=bline_point_list.end();
+                               iter--;iter--;
+                               BLinePoint prev(bline_point_list.back()->get_value().get(BLinePoint()));
+                               prev.set_tangent1(event.pos-(*iter)->get_value().get(BLinePoint()).get_vertex());
+                               bline_point_list.back()->set_value(prev);
+                       };
+                       */
+
+                       bline_point_list.push_back(ValueNode_Const::create(bline_point));
+
+                       refresh_ducks();
+                       return Smach::RESULT_ACCEPT;
+               }
+
+       default:
+               return Smach::RESULT_OK;
+       }
+}
+
+void
+StateBLine_Context::refresh_ducks(bool button_down)
+{
+       get_work_area()->clear_ducks();
+       get_work_area()->queue_draw();
+
+       if(bline_point_list.empty())
+               return;
+
+       list<ValueNode_Const::Handle>::iterator iter;
+
+       handle<WorkArea::Bezier> bezier;
+       handle<WorkArea::Duck> duck,tduck;
+       BLinePoint bline_point;
+
+       for(iter=bline_point_list.begin();iter!=bline_point_list.end();++iter)
+       {
+               ValueNode_Const::Handle value_node(*iter);
+               bline_point=(value_node->get_value().get(BLinePoint()));
+               assert(value_node);
+
+
+               // First add the duck associated with this vertex
+               duck=new WorkArea::Duck(bline_point.get_vertex());
+               duck->set_editable(true);
+#ifdef DISTINGUISH_FIRST_DUCK
+               if (iter!=bline_point_list.begin())
+                       duck->set_type(Duck::TYPE_VERTEX);
+#else
+               duck->set_type(Duck::TYPE_VERTEX);
+#endif
+               duck->set_name(strprintf("%x-vertex",value_node.get()));
+               duck->signal_edited().connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_vertex_change),value_node)
+               );
+               duck->signal_user_click(2).connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::popup_vertex_menu),value_node)
+               );
+               duck->set_guid(value_node->get_guid()^synfig::GUID::hasher(0));
+
+               get_work_area()->add_duck(duck);
+
+               // Add the tangent1 duck
+               tduck=new WorkArea::Duck(bline_point.get_tangent1());
+               tduck->set_editable(true);
+               tduck->set_name(strprintf("%x-tangent1",value_node.get()));
+               tduck->set_origin(duck);
+               tduck->set_scalar(-0.33333333333333333);
+               tduck->set_tangent(true);
+               tduck->set_guid(value_node->get_guid()^synfig::GUID::hasher(3));
+               tduck->signal_edited().connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_tangent1_change),value_node)
+               );
+               tduck->signal_user_click(2).connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::popup_handle_menu),value_node)
+               );
+
+               // See if we need to add that duck to the previous bezier
+               if(bezier)
+               {
+                       get_work_area()->add_duck(tduck);
+                       bezier->p2=duck;
+                       bezier->c2=tduck;
+
+                       bezier->signal_user_click(2).connect(
+                               sigc::bind(
+                                       sigc::mem_fun(
+                                               *this,
+                                               &studio::StateBLine_Context::popup_bezier_menu
+                                       ),
+                                       value_node
+                               )
+                       );
+
+                       //get_work_area()->add_duck(bezier->c1);
+                       //get_work_area()->add_duck(bezier->c2);
+                       get_work_area()->add_bezier(bezier);
+
+                       bezier=0;
+               }
+
+               // Now we see if we need to create a bezier
+               list<ValueNode_Const::Handle>::iterator next(iter);
+               next++;
+
+               // If our next iterator is the end, then we don't need
+               // to add a bezier.
+               //if(next==bline_point_list.end() && !loop_)
+               //      continue;
+
+               bezier=new WorkArea::Bezier();
+
+               // Add the tangent2 duck
+               tduck=new WorkArea::Duck(bline_point.get_tangent2());
+               tduck->set_editable(true);
+               tduck->set_origin(duck);
+               tduck->set_scalar(0.33333333333333333);
+               tduck->set_tangent(true);
+               if(bline_point.get_split_tangent_flag())
+               {
+                       tduck->set_name(strprintf("%x-tangent2",value_node.get()));
+                       tduck->signal_edited().connect(
+                               sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_tangent2_change),value_node)
+                       );
+               }
+               else
+               {
+                       tduck->set_name(strprintf("%x-tangent1",value_node.get()));
+                       tduck->signal_edited().connect(
+                               sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_tangent1_change),value_node)
+                       );
+               }
+               tduck->set_guid(value_node->get_guid()^synfig::GUID::hasher(4));
+               tduck->signal_user_click(2).connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::popup_handle_menu),value_node)
+               );
+
+               // Setup the next bezier
+               bezier->p1=duck;
+               bezier->c1=tduck;
+
+               get_work_area()->add_duck(tduck);
+               curr_duck=tduck;
+       }
+
+       // Add the loop, if requested
+       if(bezier && loop_)
+       {
+               curr_duck=0;
+               BLinePoint bline_point(bline_point_list.front()->get_value().get(BLinePoint()));
+
+               duck=new WorkArea::Duck(bline_point.get_vertex());
+               duck->set_editable(true);
+#ifndef DISTINGUISH_FIRST_DUCK
+               duck->set_type(Duck::TYPE_VERTEX);
+#endif
+               duck->set_name(strprintf("%x-vertex",bline_point_list.front().get()));
+               duck->signal_edited().connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_vertex_change),bline_point_list.front())
+               );
+               duck->signal_user_click(2).connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::popup_vertex_menu),bline_point_list.front())
+               );
+               get_work_area()->add_duck(duck);
+
+               // Add the tangent1 duck
+               tduck=new WorkArea::Duck(bline_point.get_tangent1());
+               tduck->set_editable(true);
+               tduck->set_name(strprintf("%x-tangent1",bline_point_list.front().get()));
+               tduck->set_origin(duck);
+               tduck->set_scalar(-0.33333333333333333);
+               tduck->set_tangent(true);
+               tduck->signal_edited().connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::on_tangent1_change),bline_point_list.front())
+               );
+               tduck->signal_user_click(2).connect(
+                       sigc::bind(sigc::mem_fun(*this,&studio::StateBLine_Context::popup_handle_menu),bline_point_list.front())
+               );
+               get_work_area()->add_duck(tduck);
+
+               bezier->p2=duck;
+               bezier->c2=tduck;
+
+               bezier->signal_user_click(2).connect(
+                       sigc::bind(
+                               sigc::mem_fun(
+                                       *this,
+                                       &studio::StateBLine_Context::popup_bezier_menu
+                               ),
+                               bline_point_list.front()
+                       )
+               );
+
+               //get_work_area()->add_duck(bezier->c1);
+               get_work_area()->add_bezier(bezier);
+       }
+       if(bezier && !loop_)
+       {
+               duck=new WorkArea::Duck(bline_point.get_vertex());
+               duck->set_ignore(true);
+               duck->set_name("temp");
+
+               // Add the tangent1 duck
+               tduck=new WorkArea::Duck(Vector(0,0));
+               tduck->set_ignore(true);
+               tduck->set_name("ttemp");
+               tduck->set_origin(duck);
+               tduck->set_scalar(-0.33333333333333333);
+
+               tduck->set_tangent(true);
+               bezier->p2=duck;
+               bezier->c2=tduck;
+
+               get_work_area()->add_duck(bezier->p2);
+               //get_work_area()->add_duck(bezier->c2);
+               get_work_area()->add_bezier(bezier);
+
+               duck->set_guid(synfig::GUID());
+               tduck->set_guid(synfig::GUID());
+
+               next_duck=duck;
+       }
+
+       if(!button_down)
+       {
+               if(curr_duck)
+               {
+                       if(next_duck)
+                       {
+                               curr_duck=next_duck;
+                               next_duck=0;
+                       }
+               }
+       }
+       get_work_area()->queue_draw();
+}
+
+
+bool
+StateBLine_Context::on_vertex_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node)
+{
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+       bline_point.set_vertex(point);
+       value_node->set_value(bline_point);
+       //refresh_ducks();
+       return true;
+}
+
+bool
+StateBLine_Context::on_tangent1_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node)
+{
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+       bline_point.set_tangent1(point);
+       value_node->set_value(bline_point);
+       //refresh_ducks();
+       return true;
+}
+
+bool
+StateBLine_Context::on_tangent2_change(const synfig::Point &point, synfig::ValueNode_Const::Handle value_node)
+{
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+       bline_point.set_tangent2(point);
+       value_node->set_value(bline_point);
+       //refresh_ducks();
+       return true;
+}
+
+void
+StateBLine_Context::loop_bline()
+{
+       loop_=true;
+
+       refresh_ducks(false);
+}
+
+void
+StateBLine_Context::unloop_bline()
+{
+       loop_=false;
+
+       refresh_ducks(false);
+}
+
+void
+StateBLine_Context::popup_vertex_menu(synfig::ValueNode_Const::Handle value_node)
+{
+       menu.items().clear();
+
+       if(loop_)
+       {
+               menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Unloop BLine"),
+                               sigc::mem_fun(*this,&studio::StateBLine_Context::unloop_bline)
+               ));
+       } else {
+               menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Loop BLine"),
+                               sigc::mem_fun(*this,&studio::StateBLine_Context::loop_bline)
+               ));
+       }
+
+       menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Delete Vertex"),
+               sigc::bind(
+                       sigc::mem_fun(*this,&studio::StateBLine_Context::bline_delete_vertex),
+                       value_node
+               )
+       ));
+
+       menu.popup(0,0);
+}
+
+void
+StateBLine_Context::popup_bezier_menu(float location, synfig::ValueNode_Const::Handle value_node)
+{
+       menu.items().clear();
+
+       menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Insert Vertex"),
+               sigc::bind(
+                       sigc::bind(
+                               sigc::mem_fun(*this,&studio::StateBLine_Context::bline_insert_vertex),
+                               location
+                       ),
+                       value_node
+               )
+       ));
+
+       menu.popup(0,0);
+}
+
+void
+StateBLine_Context::bline_insert_vertex(synfig::ValueNode_Const::Handle value_node, float origin)
+{
+       list<ValueNode_Const::Handle>::iterator iter;
+
+       for(iter=bline_point_list.begin();iter!=bline_point_list.end();++iter)
+               if(*iter==value_node)
+               {
+                       BLinePoint bline_point;
+                       BLinePoint next_bline_point((*iter)->get_value().get(BLinePoint()));
+                       BLinePoint prev_bline_point;
+
+                       list<ValueNode_Const::Handle>::iterator prev(iter);
+                       if(iter==bline_point_list.begin())
+                       {
+                               assert(loop_);
+                               prev = bline_point_list.end();
+                       }
+                       prev--;
+
+                       prev_bline_point=(*prev)->get_value().get(BLinePoint());
+
+                       etl::hermite<Vector> curve(prev_bline_point.get_vertex(),
+                                                                          next_bline_point.get_vertex(),
+                                                                          prev_bline_point.get_tangent2(),
+                                                                          next_bline_point.get_tangent1());
+                       etl::derivative< etl::hermite<Vector> > deriv(curve);
+
+                       bline_point.set_vertex(curve(origin));
+                       bline_point.set_width((next_bline_point.get_width()-prev_bline_point.get_width())*origin+prev_bline_point.get_width());
+                       bline_point.set_tangent1(deriv(origin)*std::min(1.0f-origin,origin));
+                       bline_point.set_tangent2(bline_point.get_tangent1());
+                       bline_point.set_split_tangent_flag(false);
+                       bline_point.set_origin(origin);
+
+/*
+                       bline_point.set_vertex((next_bline_point.get_vertex()+prev_bline_point.get_vertex())*0.5);
+                       bline_point.set_width((next_bline_point.get_width()+prev_bline_point.get_width())*0.5);
+                       bline_point.set_origin(origin);
+                       bline_point.set_split_tangent_flag(false);
+                       bline_point.set_tangent1((next_bline_point.get_vertex()-prev_bline_point.get_vertex())*0.5);
+*/
+
+                       bline_point_list.insert(iter,ValueNode_Const::create(bline_point));
+                       break;
+               }
+
+       if(iter==bline_point_list.end())
+       {
+               get_canvas_view()->get_ui_interface()->error(_("Unable to find where to insert vertex, internal error, please report this bug"));
+       }
+
+       refresh_ducks(false);
+}
+
+void
+StateBLine_Context::bline_delete_vertex(synfig::ValueNode_Const::Handle value_node)
+{
+       list<ValueNode_Const::Handle>::iterator iter;
+
+       for(iter=bline_point_list.begin();iter!=bline_point_list.end();++iter)
+               if(*iter==value_node)
+               {
+                       bline_point_list.erase(iter);
+                       break;
+               }
+       if(iter==bline_point_list.end())
+       {
+               get_canvas_view()->get_ui_interface()->error(_("Unable to remove vertex, internal error, please report this bug"));
+       }
+
+       refresh_ducks(false);
+}
+
+void
+StateBLine_Context::popup_handle_menu(synfig::ValueNode_Const::Handle value_node)
+{
+       menu.items().clear();
+
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+
+       if(bline_point.get_split_tangent_flag())
+               menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Merge Tangents"),
+                       sigc::bind(
+                               sigc::mem_fun(*this,&studio::StateBLine_Context::bline_attach_handle),
+                               value_node
+                       )
+               ));
+       else
+               menu.items().push_back(Gtk::Menu_Helpers::MenuElem(_("Split Tangents"),
+                       sigc::bind(
+                               sigc::mem_fun(*this,&studio::StateBLine_Context::bline_detach_handle),
+                               value_node
+                       )
+               ));
+
+       menu.popup(0,0);
+}
+
+void
+StateBLine_Context::bline_detach_handle(synfig::ValueNode_Const::Handle value_node)
+{
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+       bline_point.set_split_tangent_flag(true);
+       bline_point.set_tangent2(bline_point.get_tangent1());
+       value_node->set_value(bline_point);
+       refresh_ducks(false);
+}
+
+void
+StateBLine_Context::bline_attach_handle(synfig::ValueNode_Const::Handle value_node)
+{
+       BLinePoint bline_point(value_node->get_value().get(BLinePoint()));
+       bline_point.set_tangent1((bline_point.get_tangent1()+bline_point.get_tangent2())*0.5);
+       bline_point.set_split_tangent_flag(false);
+       value_node->set_value(bline_point);
+       refresh_ducks(false);
+}