//  Outline.cpp
//
//  Copyright (C) 2013-2016  Jaye Evins <evins@snaught.com>
//
//  This file is part of gLabels-qt.
//
//  gLabels-qt 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 3 of the License, or
//  (at your option) any later version.
//
//  gLabels-qt 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.
//
//  You should have received a copy of the GNU General Public License
//  along with gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
//


#include "Outline.hpp"

#include "ModelObject.hpp"

#include <QColor>


//
// Private
//
namespace
{
        const qreal dashSize = 2;

        const double slopPixels = 2;
        const double outlineWidthPixels = 1;
        const QColor outlineColor1(   0,   0,   0 );
        const QColor outlineColor2( 255, 255, 255 );
}


namespace glabels::model
{

        ///
        /// Set owner and enable outline
        ///
        void Outline::setOwner( ModelObject* owner )
        {
                mOwner = owner;

                mDashes << dashSize << dashSize;

                mPen1.setColor( outlineColor1 );
                mPen1.setWidth( outlineWidthPixels );
                mPen1.setCosmetic( true );
                mPen1.setCapStyle( Qt::FlatCap );
                mPen1.setDashPattern( mDashes );

                mPen2.setColor( outlineColor2 );
                mPen2.setWidth( outlineWidthPixels );
                mPen2.setCosmetic( true );
                mPen2.setCapStyle( Qt::FlatCap );
                mPen2.setDashPattern( mDashes );
                mPen2.setDashOffset( dashSize );
        }


        ///
        /// Is enabled?  (I.e. not all objects have an outline (e.g. line objects))
        ///
        bool Outline::isEnabled() const
        {
                return mOwner;
        }


        ///
        /// Draw Outline
        ///
        void Outline::draw( QPainter* painter ) const
        {
                if ( mOwner )
                {
                        painter->save();

                        painter->setBrush( Qt::NoBrush );

                        painter->setPen( mPen1 );
                        painter->drawRect( QRectF( 0, 0, mOwner->w().pt(), mOwner->h().pt() ) );

                        painter->setPen( mPen2 );
                        painter->drawRect( QRectF( 0, 0, mOwner->w().pt(), mOwner->h().pt() ) );

                        painter->restore();
                }
        }


        ///
        /// Create path for testing for hover condition
        ///
        QPainterPath Outline::hoverPath( double scale ) const
        {
                QPainterPath path;

                if ( mOwner )
                {
                        double s = 1 / scale;

                        path.addRect( -s*slopPixels, -s*slopPixels,
                                      mOwner->w().pt()+s*2*slopPixels, mOwner->h().pt()+s*2*slopPixels );
                        path.closeSubpath();
                        path.addRect( s*slopPixels, s*slopPixels,
                                      mOwner->w().pt()-s*2*slopPixels, mOwner->h().pt()-s*2*slopPixels );
                }

                return path;
        }

}
