X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fexample%2Fmetaballs.cpp;fp=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fexample%2Fmetaballs.cpp;h=b9497f82bb066c116eec32c43709b3ef5a4d4177;hb=16b3beced25134bef064705568ecb893a6be4e79;hp=0000000000000000000000000000000000000000;hpb=5a1d028f56182922addfed8f1f1c28fdde12756c;p=synfig.git

diff --git a/synfig-core/trunk/src/modules/example/metaballs.cpp b/synfig-core/trunk/src/modules/example/metaballs.cpp
new file mode 100644
index 0000000..b9497f8
--- /dev/null
+++ b/synfig-core/trunk/src/modules/example/metaballs.cpp
@@ -0,0 +1,236 @@
+/* === S I N F G =========================================================== */
+/*!	\file metaballs.cpp
+**	\brief Implements metaballs
+**
+**	$Id: metaballs.cpp,v 1.1.1.1 2005/01/04 01:23:09 darco Exp $
+**
+**	\legal
+**	Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+**	This software and associated documentation
+**	are CONFIDENTIAL and PROPRIETARY property of
+**	the above-mentioned copyright holder.
+**
+**	You may not copy, print, publish, or in any
+**	other way distribute this software without
+**	a prior written agreement with
+**	the copyright holder.
+**	\endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+#	include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include <sinfg/string.h>
+#include <sinfg/time.h>
+#include <sinfg/context.h>
+#include <sinfg/paramdesc.h>
+#include <sinfg/renddesc.h>
+#include <sinfg/surface.h>
+#include <sinfg/value.h>
+#include <sinfg/valuenode.h>
+#include <ETL/pen>
+
+#include "metaballs.h"
+
+#endif
+
+/* === U S I N G =========================================================== */
+
+using namespace etl;
+using namespace std;
+using namespace sinfg;
+
+/* === G L O B A L S ======================================================= */
+
+SINFG_LAYER_INIT(Metaballs);
+SINFG_LAYER_SET_NAME(Metaballs,"metaballs");
+SINFG_LAYER_SET_LOCAL_NAME(Metaballs,_("Metaballs"));
+SINFG_LAYER_SET_CATEGORY(Metaballs,_("Default"));
+SINFG_LAYER_SET_VERSION(Metaballs,"0.1");
+SINFG_LAYER_SET_CVS_ID(Metaballs,"$Id: metaballs.cpp,v 1.1.1.1 2005/01/04 01:23:09 darco Exp $");
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+/* === E N T R Y P O I N T ================================================= */
+
+Metaballs::Metaballs():
+	Layer_Composite(1.0,Color::BLEND_STRAIGHT),
+	color(Color::black())
+{
+}
+	
+bool
+Metaballs::set_param(const String & param, const ValueBase &value)
+{
+	if(	param=="centers" && value.same_as(centers))
+	{
+		centers = value;
+		return true;
+	}
+	
+	if(	param=="weights" && value.same_as(weights))
+	{
+		weights = value;
+		return true;
+	}
+	
+	if(	param=="radii" && value.same_as(radii))
+	{
+		radii = value;
+		return true;
+	}
+	
+	IMPORT(color);
+	IMPORT(threshold);
+	
+	return Layer_Composite::set_param(param,value);
+}
+
+ValueBase
+Metaballs::get_param(const String &param)const
+{
+	EXPORT(color);
+	
+	EXPORT(radii);
+	EXPORT(weights);	
+	EXPORT(centers);
+	EXPORT(threshold);
+
+	EXPORT_NAME();
+	EXPORT_VERSION();
+		
+	return Layer_Composite::get_param(param);	
+}
+
+Layer::Vocab
+Metaballs::get_param_vocab()const
+{
+	Layer::Vocab ret(Layer_Composite::get_param_vocab());
+	
+	ret.push_back(ParamDesc("color")
+		.set_local_name(_("Color"))
+	);
+
+	ret.push_back(ParamDesc("centers")
+		.set_local_name(_("Points"))
+	);
+	
+	ret.push_back(ParamDesc("radii")
+		.set_local_name(_("Radii"))
+	);
+	
+	ret.push_back(ParamDesc("weights")
+		.set_local_name(_("Weights"))
+	);
+	
+	ret.push_back(ParamDesc("threshold")
+		.set_local_name(_("Threshold"))
+	);
+	
+	return ret;
+}
+
+static inline Real densityfunc(const sinfg::Point &p, const sinfg::Point &c, Real R)
+{
+	const Real dx = p[0] - c[0];
+	const Real dy = p[1] - c[1];
+	
+	const Real n = (1 - (dx*dx + dy*dy)/(R*R));
+	return (n*n*n);
+
+	/*
+	f(d) = (1 - d^2)^3
+	f'(d) = -6d * (1 - d^2)^2
+	
+	could use this too...
+	f(d) = (1 - d^2)^2
+	f'(d) = -6d * (1 - d^2)
+	*/
+}
+
+Real
+Metaballs::totaldensity(const Point &pos) const
+{
+	Real density = 0;
+	
+	//sum up weighted functions
+	for(unsigned int i=0;i<centers.size();i++)
+	{
+		density += weights[i] * densityfunc(pos,centers[i], radii[i]);
+	}
+	
+	return density;
+}
+
+Color
+Metaballs::get_color(Context context, const Point &pos)const
+{
+	Real dens = totaldensity(pos);
+	
+	if(dens >= threshold) 
+		return color;
+	else
+		return context.get_color(pos);
+}
+
+bool
+Metaballs::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
+{	
+	// Width and Height of a pixel
+	const Point br(renddesc.get_br()), 
+				tl(renddesc.get_tl());
+	
+	const int 	w = renddesc.get_w(), 
+				h = renddesc.get_h();
+	
+	Real	pw = renddesc.get_pw();
+	Real	ph = renddesc.get_ph();
+		
+	SuperCallback supercb(cb,0,9000,10000);
+	
+	if(!context.accelerated_render(surface,quality,renddesc,&supercb))
+	{
+		if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
+		return false;
+	}
+		
+	Point pos(tl[0],tl[1]);
+	
+	Real	dens;
+	
+	if(!context.accelerated_render(surface,quality,renddesc,&supercb))
+	{
+		if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
+		return false;
+	}
+	
+	for(int y = 0; y < h; y++, pos[1] += ph)
+	{
+		pos[0] = tl[0];
+		for(int x = 0; x < w; x++, pos[0] += pw)
+		{
+			dens = totaldensity(pos);
+			
+			if(dens >= threshold)
+			{
+				(*surface)[y][x] = Color::blend(color,(*surface)[y][x],get_amount(),get_blend_method());
+			}
+		}		
+	}
+
+	// Mark our progress as finished
+	if(cb && !cb->amount_complete(10000,10000))
+		return false;
+
+	return true;
+}