X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fexample%2Fmetaballs.cpp;h=0cfa6c3cc27543c4b419c8a3d34bb2ea90c7ee57;hb=9459638ad6797b8139f1e9f0715c96076dbf0890;hp=6437a42d4b8b223742d3aafc2270694b0b45868f;hpb=ac4932524f054d85ef60662d1a2bb908f56a7a97;p=synfig.git

diff --git a/synfig-core/trunk/src/modules/example/metaballs.cpp b/synfig-core/trunk/src/modules/example/metaballs.cpp
index 6437a42..0cfa6c3 100644
--- a/synfig-core/trunk/src/modules/example/metaballs.cpp
+++ b/synfig-core/trunk/src/modules/example/metaballs.cpp
@@ -68,7 +68,8 @@ Metaballs::Metaballs():
 	Layer_Composite(1.0,Color::BLEND_STRAIGHT),
 	gradient(Color::black(), Color::white()),
 	threshold(0),
-	threshold2(1)
+	threshold2(1),
+	positive(false)
 {
 	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);
@@ -99,6 +100,7 @@ Metaballs::set_param(const String & param, const ValueBase &value)
 	IMPORT(gradient);
 	IMPORT(threshold);
 	IMPORT(threshold2);
+	IMPORT(positive);
 
 	return Layer_Composite::set_param(param,value);
 }
@@ -113,6 +115,7 @@ Metaballs::get_param(const String &param)const
 	EXPORT(centers);
 	EXPORT(threshold);
 	EXPORT(threshold2);
+	EXPORT(positive);
 
 	EXPORT_NAME();
 	EXPORT_VERSION();
@@ -149,15 +152,40 @@ Metaballs::get_param_vocab()const
 		.set_local_name(_("Gradient Right"))
 	);
 
+	ret.push_back(ParamDesc("positive")
+		.set_local_name(_("Positive Only"))
+	);
+
 	return ret;
 }
 
-static inline Real densityfunc(const synfig::Point &p, const synfig::Point &c, Real R)
+synfig::Layer::Handle
+Metaballs::hit_check(synfig::Context context, const synfig::Point &point)const
+{
+	Real density(totaldensity(point));
+
+	if (density <= 0 || density > 1 || get_amount() == 0)
+		return context.hit_check(point);
+
+	synfig::Layer::Handle tmp;
+
+	if (get_blend_method()==Color::BLEND_BEHIND && (tmp=context.hit_check(point)))
+		return tmp;
+
+	if (Color::is_onto(get_blend_method()) && !(context.hit_check(point)))
+		return 0;
+
+	return const_cast<Metaballs*>(this);
+}
+
+Real
+Metaballs::densityfunc(const synfig::Point &p, const synfig::Point &c, Real R)const
 {
 	const Real dx = p[0] - c[0];
 	const Real dy = p[1] - c[1];
 
 	const Real n = (1 - (dx*dx + dy*dy)/(R*R));
+	if (positive && n < 0) return 0;
 	return (n*n*n);
 
 	/*
@@ -171,7 +199,7 @@ static inline Real densityfunc(const synfig::Point &p, const synfig::Point &c, R
 }
 
 Real
-Metaballs::totaldensity(const Point &pos) const
+Metaballs::totaldensity(const Point &pos)const
 {
 	Real density = 0;