/* === 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;
}