From ac4932524f054d85ef60662d1a2bb908f56a7a97 Mon Sep 17 00:00:00 2001
From: dooglus <dooglus@1f10aa63-cdf2-0310-b900-c93c546f37ac>
Date: Sat, 22 Nov 2008 15:39:58 +0000
Subject: [PATCH] Replace the 'Threshold' parameter with 'Gradient Left' and
 'Gradient Right' which specify the values which map to each end of the
 gradient.

git-svn-id: https://synfig.svn.sourceforge.net/svnroot/synfig@2250 1f10aa63-cdf2-0310-b900-c93c546f37ac
---
 synfig-core/trunk/src/modules/example/metaballs.cpp | 14 +++++++++++---
 synfig-core/trunk/src/modules/example/metaballs.h   |  2 +-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/synfig-core/trunk/src/modules/example/metaballs.cpp b/synfig-core/trunk/src/modules/example/metaballs.cpp
index c689449..6437a42 100644
--- a/synfig-core/trunk/src/modules/example/metaballs.cpp
+++ b/synfig-core/trunk/src/modules/example/metaballs.cpp
@@ -66,7 +66,9 @@ SYNFIG_LAYER_SET_CVS_ID(Metaballs,"$Id$");
 
 Metaballs::Metaballs():
 	Layer_Composite(1.0,Color::BLEND_STRAIGHT),
-	gradient(Color::black(), Color::white())
+	gradient(Color::black(), Color::white()),
+	threshold(0),
+	threshold2(1)
 {
 	centers.push_back(Point( 0, -1.5));	radii.push_back(2.5);	weights.push_back(1);
 	centers.push_back(Point(-2,  1));	radii.push_back(2.5);	weights.push_back(1);
@@ -96,6 +98,7 @@ Metaballs::set_param(const String & param, const ValueBase &value)
 
 	IMPORT(gradient);
 	IMPORT(threshold);
+	IMPORT(threshold2);
 
 	return Layer_Composite::set_param(param,value);
 }
@@ -109,6 +112,7 @@ Metaballs::get_param(const String &param)const
 	EXPORT(weights);
 	EXPORT(centers);
 	EXPORT(threshold);
+	EXPORT(threshold2);
 
 	EXPORT_NAME();
 	EXPORT_VERSION();
@@ -138,7 +142,11 @@ Metaballs::get_param_vocab()const
 	);
 
 	ret.push_back(ParamDesc("threshold")
-		.set_local_name(_("Threshold"))
+		.set_local_name(_("Gradient Left"))
+	);
+
+	ret.push_back(ParamDesc("threshold2")
+		.set_local_name(_("Gradient Right"))
 	);
 
 	return ret;
@@ -171,7 +179,7 @@ Metaballs::totaldensity(const Point &pos) const
 	for(unsigned int i=0;i<centers.size();i++)
 		density += weights[i] * densityfunc(pos,centers[i], radii[i]);
 
-	return density;
+	return (density - threshold) / (threshold2 - threshold);
 }
 
 Color
diff --git a/synfig-core/trunk/src/modules/example/metaballs.h b/synfig-core/trunk/src/modules/example/metaballs.h
index 22567d2..b52d98e 100644
--- a/synfig-core/trunk/src/modules/example/metaballs.h
+++ b/synfig-core/trunk/src/modules/example/metaballs.h
@@ -51,7 +51,7 @@ private:
 	std::vector<synfig::Real>	weights;
 
 	synfig::Real	threshold;
-	//Real	threshold2;
+	synfig::Real	threshold2;
 
 	synfig::Real totaldensity(const synfig::Point &pos)const;
 
-- 
2.7.4