+++ /dev/null
-/* === S Y N F I G ========================================================= */
-/*! \file julia.cpp
-** \brief Implementation of the "Julia Set" layer
-**
-** $Id$
-**
-** \legal
-** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
-** Copyright (c) 2007 Chris Moore
-**
-** 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
-**
-** === N O T E S ===========================================================
-**
-** ========================================================================= */
-
-/* === H E A D E R S ======================================================= */
-
-#ifdef USING_PCH
-# include "pch.h"
-#else
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "julia.h"
-
-#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>
-
-#endif
-
-/* === M A C R O S ========================================================= */
-
-#define LOG_OF_2 0.69314718055994528623
-
-/* === G L O B A L S ======================================================= */
-
-SYNFIG_LAYER_INIT(Julia);
-SYNFIG_LAYER_SET_NAME(Julia,"julia");
-SYNFIG_LAYER_SET_LOCAL_NAME(Julia,N_("Julia Set"));
-SYNFIG_LAYER_SET_CATEGORY(Julia,N_("Fractals"));
-SYNFIG_LAYER_SET_VERSION(Julia,"0.1");
-SYNFIG_LAYER_SET_CVS_ID(Julia,"$Id$");
-
-/* === P R O C E D U R E S ================================================= */
-
-inline void
-color_neg_flip(Color &color)
-{
- if(color.get_a()==0)
- {
- color=Color::alpha();
- return;
- }
-
- if(color.get_a()<0)
- color=-color;
-
- if(color.get_r()<0)
- {
- color.set_g(color.get_g()-color.get_r());
- color.set_b(color.get_b()-color.get_r());
- color.set_r(0);
- }
- if(color.get_g()<0)
- {
- color.set_r(color.get_r()-color.get_g());
- color.set_b(color.get_b()-color.get_g());
- color.set_g(0);
- }
- if(color.get_b()<0)
- {
- color.set_r(color.get_r()-color.get_b());
- color.set_g(color.get_g()-color.get_b());
- color.set_b(0);
- }
-}
-
-/* === M E T H O D S ======================================================= */
-
-Julia::Julia():color_shift(angle::degrees(0))
-{
- icolor=Color::black();
- ocolor=Color::black();
- iterations=32;
- color_shift=Angle::deg(0);
-
- distort_inside=true;
- distort_outside=true;
- shade_inside=true;
- shade_outside=true;
- solid_inside=false;
- solid_outside=false;
- invert_inside=false;
- invert_outside=false;
- color_inside=true;
- color_outside=false;
- color_cycle=false;
- smooth_outside=true;
- broken=false;
- seed=Point(0,0);
-
- bailout=4;
- lp=log(log(bailout));
-}
-
-bool
-Julia::set_param(const String & param, const ValueBase &value)
-{
-
- IMPORT(icolor);
- IMPORT(ocolor);
- IMPORT(color_shift);
- IMPORT(seed);
-
- IMPORT(distort_inside);
- IMPORT(distort_outside);
- IMPORT(shade_inside);
- IMPORT(shade_outside);
- IMPORT(solid_inside);
- IMPORT(solid_outside);
- IMPORT(invert_inside);
- IMPORT(invert_outside);
- IMPORT(color_inside);
- IMPORT(color_outside);
-
- IMPORT(color_cycle);
- IMPORT(smooth_outside);
- IMPORT(broken);
-
- if(param=="iterations" && value.same_type_as(iterations))
- {
- iterations=value.get(iterations);
- if(iterations<0)
- iterations=0;
- if(iterations>500000)
- iterations=500000;
- return true;
- }
- if(param=="bailout" && value.same_type_as(bailout))
- {
- bailout=value.get(bailout);
- bailout*=bailout;
- lp=log(log(bailout));
- return true;
- }
-
- return false;
-}
-
-ValueBase
-Julia::get_param(const String & param)const
-{
- EXPORT(icolor);
- EXPORT(ocolor);
- EXPORT(color_shift);
- EXPORT(iterations);
- EXPORT(seed);
-
- EXPORT(distort_inside);
- EXPORT(distort_outside);
- EXPORT(shade_inside);
- EXPORT(shade_outside);
- EXPORT(solid_inside);
- EXPORT(solid_outside);
- EXPORT(invert_inside);
- EXPORT(invert_outside);
- EXPORT(color_inside);
- EXPORT(color_outside);
- EXPORT(color_cycle);
- EXPORT(smooth_outside);
- EXPORT(broken);
-
- if(param=="bailout")
- return sqrt(bailout);
-
- EXPORT_NAME();
- EXPORT_VERSION();
-
- return ValueBase();
-}
-
-Color
-Julia::get_color(Context context, const Point &pos)const
-{
- Real
- cr, ci,
- zr, zi,
- zr_hold;
-
- ColorReal
- depth, mag(0);
-
- Color
- ret;
-
- cr=seed[0];
- ci=seed[1];
- zr=pos[0];
- zi=pos[1];
-
- for(int i=0;i<iterations;i++)
- {
- // Perform complex multiplication
- zr_hold=zr;
- zr=zr*zr-zi*zi + cr;
- zi=zr_hold*zi*2 + ci;
-
- // Use "broken" algorithm, if requested (looks weird)
- if(broken)zr+=zi;
-
- // Calculate Magnitude
- mag=zr*zr+zi*zi;
-
- if(mag>4)
- {
- if(smooth_outside)
- {
- // Darco's original mandelbrot smoothing algo
- // depth=((Point::value_type)i+(2.0-sqrt(mag))/PI);
-
- // Linas Vepstas algo (Better than darco's)
- // See (http://linas.org/art-gallery/escape/smooth.html)
- depth= (ColorReal)i - log(log(sqrt(mag))) / LOG_OF_2;
-
- // Clamp
- if(depth<0) depth=0;
- }
- else
- depth=static_cast<ColorReal>(i);
-
- if(solid_outside)
- ret=ocolor;
- else
- if(distort_outside)
- ret=context.get_color(Point(zr,zi));
- else
- ret=context.get_color(pos);
-
- if(invert_outside)
- ret=~ret;
-
- if(color_outside)
- ret=ret.set_uv(zr,zi).clamped_negative();
-
- if(color_cycle)
- ret=ret.rotate_uv(color_shift.operator*(depth)).clamped_negative();
-
- if(shade_outside)
- {
- ColorReal alpha=depth/static_cast<ColorReal>(iterations);
- ret=(ocolor-ret)*alpha+ret;
- }
- return ret;
- }
- }
-
- if(solid_inside)
- ret=icolor;
- else
- if(distort_inside)
- ret=context.get_color(Point(zr,zi));
- else
- ret=context.get_color(pos);
-
- if(invert_inside)
- ret=~ret;
-
- if(color_inside)
- ret=ret.set_uv(zr,zi).clamped_negative();
-
- if(shade_inside)
- ret=(icolor-ret)*mag+ret;
-
- return ret;
-}
-
-Layer::Vocab
-Julia::get_param_vocab()const
-{
- Layer::Vocab ret;
-
- ret.push_back(ParamDesc("icolor")
- .set_local_name(_("Inside Color"))
- .set_description(_("Color of the Set"))
- );
- ret.push_back(ParamDesc("ocolor")
- .set_local_name(_("Outside Color"))
- .set_description(_("Color outside the Set"))
- );
- ret.push_back(ParamDesc("color_shift")
- .set_local_name(_("Color Shift"))
- );
- ret.push_back(ParamDesc("iterations")
- .set_local_name(_("Iterations"))
- );
- ret.push_back(ParamDesc("seed")
- .set_local_name(_("Seed Point"))
- );
- ret.push_back(ParamDesc("bailout")
- .set_local_name(_("Bailout ValueBase"))
- );
-
- ret.push_back(ParamDesc("distort_inside")
- .set_local_name(_("Distort Inside"))
- );
- ret.push_back(ParamDesc("shade_inside")
- .set_local_name(_("Shade Inside"))
- );
- ret.push_back(ParamDesc("solid_inside")
- .set_local_name(_("Solid Inside"))
- );
- ret.push_back(ParamDesc("invert_inside")
- .set_local_name(_("Invert Inside"))
- );
- ret.push_back(ParamDesc("color_inside")
- .set_local_name(_("Color Inside"))
- );
- ret.push_back(ParamDesc("distort_outside")
- .set_local_name(_("Distort Outside"))
- );
- ret.push_back(ParamDesc("shade_outside")
- .set_local_name(_("Shade Outside"))
- );
- ret.push_back(ParamDesc("solid_outside")
- .set_local_name(_("Solid Outside"))
- );
- ret.push_back(ParamDesc("invert_outside")
- .set_local_name(_("Invert Outside"))
- );
- ret.push_back(ParamDesc("color_outside")
- .set_local_name(_("Color Outside"))
- );
-
- ret.push_back(ParamDesc("color_cycle")
- .set_local_name(_("Color Cycle"))
- );
- ret.push_back(ParamDesc("smooth_outside")
- .set_local_name(_("Smooth Outside"))
- .set_description(_("Smooth the coloration outside the set"))
- );
- ret.push_back(ParamDesc("broken")
- .set_local_name(_("Break Set"))
- .set_description(_("Modify equation to achieve interesting results"))
- );
-
-
- return ret;
-}
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