kicad/include/painter.h

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
 * Copyright (C) 2013 CERN
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * This program 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 program 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 this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef __CLASS_PAINTER_H
#define __CLASS_PAINTER_H

#include <map>
#include <set>

#include <gal/color4d.h>
#include <render_settings.h>
#include <layers_id_colors_and_visibility.h>
#include <memory>

class EDA_ITEM;
class COLOR_SETTINGS;

namespace KIGFX
{
class GAL;
class VIEW_ITEM;

/**
 * PAINTER
 * contains all the knowledge about how to draw graphical object onto
 * any particular output device.
 * This knowledge is held outside the individual graphical objects so that
 * alternative output devices may be used, and so that the graphical objects
 * themselves to not contain drawing routines.  Drawing routines in the objects
 * cause problems with usages of the objects as simple container objects in
 * DLL/DSOs.
 * PAINTER is an abstract layer, because every module (pcbnew, eeschema, etc.)
 * has to draw different kinds of objects.
 */
class PAINTER
{
public:
    /**
     * Constructor PAINTER( GAL* )
     * initializes this object for painting on any of the polymorphic
     * GRAPHICS_ABSTRACTION_LAYER* derivatives.
     *
     * @param aGal is a pointer to a polymorphic GAL device on which
     *  to draw (i.e. Cairo, OpenGL, wxDC)
     *  No ownership is given to this PAINTER of aGal.
     */
    PAINTER( GAL* aGal );
    virtual ~PAINTER();

    /**
     * Function SetGAL
     * Changes Graphics Abstraction Layer used for drawing items for a new one.
     * @param aGal is the new GAL instance.
     */
    void SetGAL( GAL* aGal )
    {
        m_gal = aGal;
    }

    /**
     * Function ApplySettings
     * Loads colors and display modes settings that are going to be used when drawing items.
     * @param aSettings are settings to be applied.
     */
    virtual void ApplySettings( const RENDER_SETTINGS* aSettings ) = 0;

    /**
     * Function GetAdapter
     * Returns pointer to current settings that are going to be used when drawing items.
     * @return Current rendering settings.
     */
    virtual RENDER_SETTINGS* GetSettings() = 0;

    /**
     * Function Draw
     * Takes an instance of VIEW_ITEM and passes it to a function that know how to draw the item.
     * @param aItem is an item to be drawn.
     * @param aLayer tells which layer is currently rendered so that draw functions
     * may know what to draw (eg. for pads there are separate layers for holes, because they
     * have other dimensions then the pad itself.
     */
    virtual bool Draw( const VIEW_ITEM* aItem, int aLayer ) = 0;

protected:
    /// Instance of graphic abstraction layer that gives an interface to call
    /// commands used to draw (eg. DrawLine, DrawCircle, etc.)
    GAL* m_gal;

    /// Color of brightened item frame
    COLOR4D m_brightenedColor;
};

} // namespace KIGFX

#endif /* __CLASS_PAINTER_H */