/* === S Y N F I G ========================================================= */

/*!	\file zoom.cpp

**	\brief Implementation of the "Zoom" layer, aka "Scale"

**

**	$Id$

**

**	\legal

**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley

**	Copyright (c) 2012-2013 Carlos Lรณpez

**

**	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></config.h>

#endif

#include <synfig localization.h=""></synfig>

#include <synfig general.h=""></synfig>

#include <synfig string.h=""></synfig>

#include <synfig time.h=""></synfig>

#include <synfig context.h=""></synfig>

#include <synfig paramdesc.h=""></synfig>

#include <synfig renddesc.h=""></synfig>

#include <synfig surface.h=""></synfig>

#include <synfig value.h=""></synfig>

#include <synfig valuenode.h=""></synfig>

#include <synfig transform.h=""></synfig>

#include "zoom.h"

#include <synfig common="" rendering="" task="" tasktransformation.h=""></synfig>

#include <synfig primitive="" rendering="" transformationaffine.h=""></synfig>

#endif

using namespace std;

using namespace etl;

using namespace synfig;

using namespace modules;

using namespace lyr_std;

/* === M A C R O S ========================================================= */

/* === G L O B A L S ======================================================= */

SYNFIG_LAYER_INIT(Zoom);

SYNFIG_LAYER_SET_NAME(Zoom,"zoom");

SYNFIG_LAYER_SET_LOCAL_NAME(Zoom,N_("Scale"));

SYNFIG_LAYER_SET_CATEGORY(Zoom,N_("Transform"));

SYNFIG_LAYER_SET_VERSION(Zoom,"0.1");

SYNFIG_LAYER_SET_CVS_ID(Zoom,"$Id$");

/* === 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 ================================================= */

Zoom::Zoom():

	param_center(ValueBase(Vector(0,0))),

	param_amount(ValueBase(Real(0)))

{

	SET_INTERPOLATION_DEFAULTS();

	SET_STATIC_DEFAULTS();

}

bool

Zoom::set_param(const String & param, const ValueBase &value)

{

	IMPORT_VALUE(param_center);

	IMPORT_VALUE(param_amount);

	return false;

}

ValueBase

Zoom::get_param(const String ¶m)const

{

	EXPORT_VALUE(param_center);

	EXPORT_VALUE(param_amount);

	EXPORT_NAME();

	EXPORT_VERSION();

	return ValueBase();

}

Layer::Vocab

Zoom::get_param_vocab()const

{

	Layer::Vocab ret;

	ret.push_back(ParamDesc("amount")

		.set_local_name(_("Amount"))

		.set_description(_("Amount to scale to"))

		.set_origin("center")

		.set_exponential()

	);

	ret.push_back(ParamDesc("center")

		.set_local_name(_("Origin"))

		.set_description(_("Point to scale from"))

	);

	return ret;

}

Layer::Handle

Zoom::hit_check(Context context, const Point &pos)const

{

	Vector center=param_center.get(Vector());

	return context.hit_check((pos-center)/exp(param_amount.get(Real()))+center);

}

Color

Zoom::get_color(Context context, const Point &pos)const

{

	Vector center=param_center.get(Vector());

	return context.get_color((pos-center)/exp(param_amount.get(Real()))+center);

}

class lyr_std::Zoom_Trans : public Transform

{

	etl::handle<const zoom=""> layer;</const>

public:

	Zoom_Trans(const Zoom* x):Transform(x->get_guid()),layer(x) { }

	Vector perform(const Vector& x)const

	{

		Vector center=layer->param_center.get(Vector());

		Real amount=layer->param_amount.get(Real());

		return (x-center)*exp(amount)+center;

	}

	Vector unperform(const Vector& x)const

	{

		Vector center=layer->param_center.get(Vector());

		Real amount=layer->param_amount.get(Real());

		return (x-center)/exp(amount)+center;

	}

	String get_string()const

	{

		return "zoom";

	}

};

etl::handle<transform></transform>

Zoom::get_transform()const

{

	return new Zoom_Trans(this);

}

Rect

Zoom::get_full_bounding_rect(Context context)const

{

	Vector center=param_center.get(Vector());

	return (context.get_full_bounding_rect()-center)*exp(param_amount.get(Real()))+center;

}

rendering::Task::Handle

Zoom::build_rendering_task_vfunc(Context context)const

{

	Real amount=param_amount.get(Real());

	Point center=param_center.get(Point());

	rendering::TaskTransformationAffine::Handle task_transformation(new rendering::TaskTransformationAffine());

	task_transformation->transformation->matrix =

			Matrix().set_translate(center)

		  * Matrix().set_scale(exp(amount))

		  * Matrix().set_translate(-center);

	task_transformation->sub_task() = context.build_rendering_task();

	return task_transformation;

}