ICmpSelectable.h

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/* Copyright (C) 2012 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_ICMPSELECTABLE
#define INCLUDED_ICMPSELECTABLE

#include "ps/CStrIntern.h"
#include "simulation2/system/Interface.h"

struct CColor;

class ICmpSelectable : public IComponent
{
public:

    enum EOverlayType {
        /// A single textured quad overlay, intended for entities that move around much, like units (e.g. foot soldiers, etc).
        DYNAMIC_QUAD,
        /// A more complex textured line overlay, composed of several textured line segments. Intended for entities that do not
        /// move often, such as buildings (structures).
        STATIC_OUTLINE,
    };

    struct SOverlayDescriptor
    {
        EOverlayType m_Type;
        CStrIntern m_QuadTexture;
        CStrIntern m_QuadTextureMask;
        CStrIntern m_LineTexture;
        CStrIntern m_LineTextureMask;
        float m_LineThickness;
        
        SOverlayDescriptor() : m_LineThickness(0) { }
    };

    /**
     * Returns true if the entity is only selectable in Atlas editor, e.g. a decorative visual actor.
     */
    virtual bool IsEditorOnly() = 0;

    /**
     * Set the selection highlight state.
     * The highlight is typically a circle/square overlay around the unit.
     * @param color color and alpha of the selection highlight. Set color.a = 0 to hide the highlight.
     * @param selected whether the entity is selected; affects desaturation for always visible highlights.
     */
    virtual void SetSelectionHighlight(CColor color, bool selected) = 0;

    /**
     * Enables or disables rendering of an entity's selectable.
     * @param visible Whether the selectable should be visible.
     */
    virtual void SetVisibility(bool visible) = 0;

    /**
     * Set the alpha of the selection highlight. Set to 0 to hide the highlight.
     */
    virtual void SetSelectionHighlightAlpha(float alpha) = 0;

    DECLARE_INTERFACE_TYPE(Selectable)

    // TODO: this is slightly ugly design; it would be nice to change the component system to support per-component-type data 
    // and methods, where we can keep settings like these. Note that any such data store would need to be per-component-manager
    // and not entirely global, to support multiple simulation instances.
    static bool ms_EnableDebugOverlays; // ms for member static
};

#endif // INCLUDED_ICMPSELECTABLE