--- /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;
+}
projects / synfig.git / blobdiff