From 9ff670a60001e455fa506f6b6292300e8d1cec8f Mon Sep 17 00:00:00 2001
From: Carlos Lopez <carlos@pcnuevo.(none)>
Date: Mon, 6 Jul 2009 16:02:03 +0200
Subject: [PATCH] Simplified version for reverse manipulation Scale convert
 types ducks

---
 synfig-core/trunk/src/synfig/valuenode_scale.cpp | 15 +++++++++++++++
 synfig-core/trunk/src/synfig/valuenode_scale.h   |  3 +++
 synfig-studio/trunk/src/gtkmm/canvasview.cpp     |  6 ++++++
 synfig-studio/trunk/src/synfigapp/instance.cpp   |  2 ++
 4 files changed, 26 insertions(+)

diff --git a/synfig-core/trunk/src/synfig/valuenode_scale.cpp b/synfig-core/trunk/src/synfig/valuenode_scale.cpp
index a0bba53..25b3822 100644
--- a/synfig-core/trunk/src/synfig/valuenode_scale.cpp
+++ b/synfig-core/trunk/src/synfig/valuenode_scale.cpp
@@ -141,6 +141,21 @@ synfig::ValueNode_Scale::operator()(Time t)const
 	return ValueBase();
 }
 
+synfig::ValueBase
+synfig::ValueNode_Scale::operator()(Time t, const synfig::Point &target_value)const
+{
+	Real scalar_value((*scalar)(t).get(Real()));
+	if(scalar_value==0)
+		return (*value_node)(t).get(value_node->get_type());
+	switch (get_type())
+	case ValueBase::TYPE_REAL:
+		return target_value.mag() / scalar_value;
+	case ValueBase::TYPE_ANGLE:
+		return Angle::tan(target_value[1] / scalar_value ,target_value[0] / scalar_value);
+	default:
+		return target_value / scalar_value;
+}
+
 
 bool
 ValueNode_Scale::set_link_vfunc(int i,ValueNode::Handle value)
diff --git a/synfig-core/trunk/src/synfig/valuenode_scale.h b/synfig-core/trunk/src/synfig/valuenode_scale.h
index bb1ccd0..a11f6e0 100644
--- a/synfig-core/trunk/src/synfig/valuenode_scale.h
+++ b/synfig-core/trunk/src/synfig/valuenode_scale.h
@@ -64,6 +64,9 @@ public:
 
 	virtual ValueBase operator()(Time t)const;
 
+	//! Returns the modified Link to match the target value at time t
+	virtual ValueBase operator()(Time t, const synfig::Point &target_value) const;
+
 	virtual String get_name()const;
 
 	virtual String get_local_name()const;
diff --git a/synfig-studio/trunk/src/gtkmm/canvasview.cpp b/synfig-studio/trunk/src/gtkmm/canvasview.cpp
index 4a555a8..50789a9 100644
--- a/synfig-studio/trunk/src/gtkmm/canvasview.cpp
+++ b/synfig-studio/trunk/src/gtkmm/canvasview.cpp
@@ -2887,6 +2887,12 @@ CanvasView::on_duck_changed(const synfig::Point &value,const synfigapp::ValueDes
 		}
 	}
 
+	if (ValueNode_Scale::Handle scale_value_node = ValueNode_Scale::Handle::cast_dynamic(value_desc.get_value_node()))
+	{
+		int link_index(scale_value_node->get_link_index_from_name("link"));
+		return canvas_interface()->change_value(synfigapp::ValueDesc(scale_value_node,link_index), scale_value_node(t, value));
+	}
+
 	switch(value_desc.get_value_type())
 	{
 	case ValueBase::TYPE_REAL:
diff --git a/synfig-studio/trunk/src/synfigapp/instance.cpp b/synfig-studio/trunk/src/synfigapp/instance.cpp
index 020d337..c3c542b 100644
--- a/synfig-studio/trunk/src/synfigapp/instance.cpp
+++ b/synfig-studio/trunk/src/synfigapp/instance.cpp
@@ -42,6 +42,7 @@
 #include <synfig/valuenode_blinecalctangent.h>
 #include <synfig/valuenode_blinecalcvertex.h>
 #include <synfig/valuenode_blinecalcwidth.h>
+#include <synfig/valuenode_scale.h>
 #include <map>
 
 #include "general.h"
@@ -74,6 +75,7 @@ synfigapp::is_editable(synfig::ValueNode::Handle value_node)
 		|| ValueNode_BLineCalcVertex::Handle::cast_dynamic(value_node)
 		|| ValueNode_BLineCalcTangent::Handle::cast_dynamic(value_node)
 		|| ValueNode_BLineCalcWidth::Handle::cast_dynamic(value_node)
+		|| ValueNode_Scale::Handle::cast_dynamic(value_node)
 	)
 		return true;
 	return false;
-- 
2.7.4