--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file metaballs.cpp
+** \brief Implementation of the "Metaballs" layer
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+** 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 <synfig/string.h>
+#include <synfig/time.h>
+#include <synfig/context.h>
+#include <synfig/paramdesc.h>
+#include <synfig/renddesc.h>
+#include <synfig/surface.h>
+#include <synfig/value.h>
+#include <synfig/valuenode.h>
+#include <ETL/pen>
+
+#include "metaballs.h"
+
+#endif
+
+/* === U S I N G =========================================================== */
+
+using namespace etl;
+using namespace std;
+using namespace synfig;
+
+/* === G L O B A L S ======================================================= */
+
+SYNFIG_LAYER_INIT(Metaballs);
+SYNFIG_LAYER_SET_NAME(Metaballs,"metaballs");
+SYNFIG_LAYER_SET_LOCAL_NAME(Metaballs,N_("Metaballs"));
+SYNFIG_LAYER_SET_CATEGORY(Metaballs,N_("Example"));
+SYNFIG_LAYER_SET_VERSION(Metaballs,"0.1");
+SYNFIG_LAYER_SET_CVS_ID(Metaballs,"$Id$");
+
+/* === 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),
+ gradient(Color::black(), Color::white()),
+ threshold(0),
+ 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);
+ centers.push_back(Point( 2, 1)); radii.push_back(2.5); weights.push_back(1);
+}
+
+bool
+Metaballs::set_param(const String & param, const ValueBase &value)
+{
+ if( param=="centers" && value.same_type_as(centers))
+ {
+ centers = value;
+ return true;
+ }
+
+ if( param=="weights" && value.same_type_as(weights))
+ {
+ weights = value;
+ return true;
+ }
+
+ if( param=="radii" && value.same_type_as(radii))
+ {
+ radii = value;
+ return true;
+ }
+
+ IMPORT(gradient);
+ IMPORT(threshold);
+ IMPORT(threshold2);
+ IMPORT(positive);
+
+ return Layer_Composite::set_param(param,value);
+}
+
+ValueBase
+Metaballs::get_param(const String ¶m)const
+{
+ EXPORT(gradient);
+
+ EXPORT(radii);
+ EXPORT(weights);
+ EXPORT(centers);
+ EXPORT(threshold);
+ EXPORT(threshold2);
+ EXPORT(positive);
+
+ 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("gradient")
+ .set_local_name(_("Gradient"))
+ );
+
+ 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(_("Gradient Left"))
+ );
+
+ ret.push_back(ParamDesc("threshold2")
+ .set_local_name(_("Gradient Right"))
+ );
+
+ ret.push_back(ParamDesc("positive")
+ .set_local_name(_("Positive Only"))
+ );
+
+ return ret;
+}
+
+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);
+
+ /*
+ 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 - threshold) / (threshold2 - threshold);
+}
+
+Color
+Metaballs::get_color(Context context, const Point &pos)const
+{
+ if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
+ return gradient(totaldensity(pos));
+ else
+ return Color::blend(gradient(totaldensity(pos)),context.get_color(pos),get_amount(),get_blend_method());
+}
+
+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());
+ const Real pw(renddesc.get_pw()), ph(renddesc.get_ph());
+
+ SuperCallback supercb(cb,0,9000,10000);
+
+ Point pos(tl[0],tl[1]);
+
+ 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)
+ (*surface)[y][x] = Color::blend(gradient(totaldensity(pos)),(*surface)[y][x],get_amount(),get_blend_method());
+ }
+
+ // Mark our progress as finished
+ if(cb && !cb->amount_complete(10000,10000))
+ return false;
+
+ return true;
+}
projects / synfig.git / blobdiff