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

/*!	\file stretch.cpp

**	\brief Implementation of the "Stretch" layer

**

**	$Id$

**

**	\legal

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

**	Copyright (c) 2007 Chris Moore

**	Copyright (c) 2011-2013 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 "stretch.h"

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

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

#endif

/* === U S I N G =========================================================== */

using namespace std;

using namespace etl;

using namespace synfig;

using namespace modules;

using namespace lyr_std;

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

SYNFIG_LAYER_INIT(Layer_Stretch);

SYNFIG_LAYER_SET_NAME(Layer_Stretch,"stretch");

SYNFIG_LAYER_SET_LOCAL_NAME(Layer_Stretch,N_("Stretch"));

SYNFIG_LAYER_SET_CATEGORY(Layer_Stretch,N_("Distortions"));

SYNFIG_LAYER_SET_VERSION(Layer_Stretch,"0.1");

SYNFIG_LAYER_SET_CVS_ID(Layer_Stretch,"$Id$");

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

Layer_Stretch::Layer_Stretch():

	param_amount(ValueBase(Point(1,1))),

	param_center(ValueBase(Point(0,0)))

{

	SET_INTERPOLATION_DEFAULTS();

	SET_STATIC_DEFAULTS();

}

bool

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

{

	IMPORT_VALUE(param_amount);

	IMPORT_VALUE(param_center);

	return false;

}

ValueBase

Layer_Stretch::get_param(const String ¶m)const

{

	EXPORT_VALUE(param_amount);

	EXPORT_VALUE(param_center);

	EXPORT_NAME();

	EXPORT_VERSION();

	return ValueBase();

}

Layer::Vocab

Layer_Stretch::get_param_vocab()const

{

	Layer::Vocab ret;

	ret.push_back(ParamDesc("amount")

		.set_local_name(_("Amount"))

		.set_origin("center")

		.set_description(_("Size of the stretch relative to its Center"))

	);

	ret.push_back(ParamDesc("center")

		.set_local_name(_("Center"))

		.set_description(_("Where the stretch distortion is centered"))

	);

	return ret;

}

Layer::Handle

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

{

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

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

	Point npos(pos);

	npos[0]=(npos[0]-center[0])/amount[0]+center[0];

	npos[1]=(npos[1]-center[1])/amount[1]+center[1];

	return context.hit_check(npos);

}

Color

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

{

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

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

	Point npos(pos);

	npos[0]=(npos[0]-center[0])/amount[0]+center[0];

	npos[1]=(npos[1]-center[1])/amount[1]+center[1];

	return context.get_color(npos);

}

class lyr_std::Stretch_Trans : public Transform

{

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

public:

	Stretch_Trans(const Layer_Stretch* x):Transform(x->get_guid()),layer(x) { }

	Vector perform(const Vector& x)const

	{

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

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

		return Vector((x[0]-center[0])*amount[0]+center[0],

					  (x[1]-center[1])*amount[1]+center[1]);

	}

	Vector unperform(const Vector& x)const

	{

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

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

		return Vector((x[0]-center[0])/amount[0]+center[0],

					  (x[1]-center[1])/amount[1]+center[1]);

	}

	String get_string()const

	{

		return "stretch";

	}

};

etl::handle<transform></transform>

Layer_Stretch::get_transform()const

{

	return new Stretch_Trans(this);

}

Rect

Layer_Stretch::get_full_bounding_rect(Context context)const

{

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

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

	Rect rect(context.get_full_bounding_rect());

	Point min(rect.get_min()), max(rect.get_max());

	return Rect(Point((min[0]-center[0])*amount[0]+center[0],

					  (min[1]-center[1])*amount[1]+center[1]),

				Point((max[0]-center[0])*amount[0]+center[0],

					  (max[1]-center[1])*amount[1]+center[1]));

}

rendering::Task::Handle

Layer_Stretch::build_rendering_task_vfunc(Context context)const

{

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

	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(amount)

		  * Matrix().set_translate(-center);

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

	return task_transformation;

}