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twirl.cpp
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twirl.cpp
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/* === S Y N F I G ========================================================= */
/*! \file twirl.cpp
** \brief Implementation of the "Twirl" layer
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2011-2013 Carlos López
**
** 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/localization.h>
#include <synfig/string.h>
#include <synfig/time.h>
#include <synfig/context.h>
#include <synfig/paramdesc.h>
#include <synfig/renddesc.h>
#include <synfig/value.h>
#include <synfig/transform.h>
#include "twirl.h"
#endif
/* === U S I N G =========================================================== */
using namespace etl;
using namespace synfig;
using namespace modules;
using namespace lyr_std;
/* === G L O B A L S ======================================================= */
SYNFIG_LAYER_INIT(Twirl);
SYNFIG_LAYER_SET_NAME(Twirl,"twirl");
SYNFIG_LAYER_SET_LOCAL_NAME(Twirl,N_("Twirl"));
SYNFIG_LAYER_SET_CATEGORY(Twirl,N_("Distortions"));
SYNFIG_LAYER_SET_VERSION(Twirl,"0.1");
/* === 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 ================================================= */
Twirl::Twirl():
Layer_CompositeFork(1.0,Color::BLEND_STRAIGHT),
param_center(ValueBase(Point(0,0))),
param_radius(ValueBase(Real(1.0))),
param_rotations(ValueBase(Angle::zero())),
param_distort_inside(ValueBase(true)),
param_distort_outside(ValueBase(false))
{
SET_INTERPOLATION_DEFAULTS();
SET_STATIC_DEFAULTS();
}
bool
Twirl::set_param(const String & param, const ValueBase &value)
{
IMPORT_VALUE(param_center);
IMPORT_VALUE(param_radius);
IMPORT_VALUE(param_rotations);
IMPORT_VALUE(param_distort_inside);
IMPORT_VALUE(param_distort_outside);
return Layer_Composite::set_param(param,value);
}
ValueBase
Twirl::get_param(const String ¶m)const
{
EXPORT_VALUE(param_center);
EXPORT_VALUE(param_radius);
EXPORT_VALUE(param_rotations);
EXPORT_VALUE(param_distort_inside);
EXPORT_VALUE(param_distort_outside);
EXPORT_NAME();
EXPORT_VERSION();
return false;
}
Layer::Vocab
Twirl::get_param_vocab()const
{
Layer::Vocab ret;
ret.push_back(ParamDesc("center")
.set_local_name(_("Center"))
.set_description(_("Center of the circle"))
.set_is_distance()
);
ret.push_back(ParamDesc("radius")
.set_local_name(_("Radius"))
.set_description(_("Radius of the circle"))
.set_is_distance()
.set_origin("center")
);
ret.push_back(ParamDesc("rotations")
.set_local_name(_("Rotations"))
.set_description(_("Number of rotations of the twirl effect"))
.set_origin("center")
);
ret.push_back(ParamDesc("distort_inside")
.set_local_name(_("Distort Inside"))
.set_description(_("When checked, distorts inside the circle"))
);
ret.push_back(ParamDesc("distort_outside")
.set_local_name(_("Distort Outside"))
.set_description(_("When checked, distorts outside the circle"))
);
return ret;
}
Point
Twirl::distort(const Point &pos,bool reverse)const
{
Point center=param_center.get(Point());
Real radius=param_radius.get(Real());
Angle rotations=param_rotations.get(Angle());
bool distort_inside=param_distort_inside.get(bool());
bool distort_outside=param_distort_outside.get(bool());
Point centered(pos-center);
Real mag(centered.mag());
Angle a;
if((distort_inside || mag>radius) && (distort_outside || mag<radius))
a=rotations*((centered.mag()-radius)/radius);
else
return pos;
if(reverse) a=-a;
const Real sin(Angle::sin(a).get());
const Real cos(Angle::cos(a).get());
Point twirled;
twirled[0]=cos*centered[0]-sin*centered[1];
twirled[1]=sin*centered[0]+cos*centered[1];
return twirled+center;
}
Layer::Handle
Twirl::hit_check(Context context, const Point &pos)const
{
return context.hit_check(distort(pos));
}
Color
Twirl::get_color(Context context, const Point &pos)const
{
return context.get_color(distort(pos));
}
class lyr_std::Twirl_Trans : public Transform
{
etl::handle<const Twirl> layer;
public:
Twirl_Trans(const Twirl* x):Transform(x->get_guid()),layer(x) { }
Vector perform(const Vector& x)const
{
return layer->distort(x,true);
}
Vector unperform(const Vector& x)const
{
return layer->distort(x,false);
}
String get_string()const
{
return "twirl";
}
};
etl::handle<Transform>
Twirl::get_transform()const
{
return new Twirl_Trans(this);
}
/*
bool
Twirl::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
{
RENDER_TRANSFORMED_IF_NEED(__FILE__, __LINE__)
SuperCallback supercb(cb,0,9500,10000);
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
surface->set_wh(renddesc.get_w(),renddesc.get_h());
}
else
{
if(!context.accelerated_render(surface,quality,renddesc,&supercb))
return false;
if(get_amount()==0)
return true;
}
int x,y;
Surface::pen pen(surface->begin());
const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
Point pos;
Point tl(renddesc.get_tl());
const int w(surface->get_w());
const int h(surface->get_h());
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(color_func(pos));
}
else
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(Color::blend(color_func(pos),pen.get_value(),get_amount(),get_blend_method()));
}
// Mark our progress as finished
if(cb && !cb->amount_complete(10000,10000))
return false;
return true;
}
*/
RendDesc
Twirl::get_sub_renddesc_vfunc(const RendDesc &renddesc) const
{
RendDesc desc(renddesc);
Real pw = desc.get_pw();
Real ph = desc.get_ph();
desc.set_tl(Vector(-10.0, -10.0));
desc.set_br(Vector( 10.0, 10.0));
desc.set_wh(
(int)approximate_ceil(fabs((desc.get_br()[0] - desc.get_tl()[0])/pw)),
(int)approximate_ceil(fabs((desc.get_br()[1] - desc.get_tl()[1])/ph)) );
return desc;
}
rendering::Task::Handle
Twirl::build_rendering_task_vfunc(Context context) const
{ return Layer::build_rendering_task_vfunc(context); }