ConcaveShape.hpp

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//
// Thor C++ Library
// Copyright (c) 2011-2015 Jan Haller
// 
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// 
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 
// 3. This notice may not be removed or altered from any source distribution.
//


#ifndef THOR_CONCAVESHAPE_HPP
#define THOR_CONCAVESHAPE_HPP

#include <Thor/Config.hpp>

#include <SFML/Graphics/Color.hpp>
#include <SFML/Graphics/ConvexShape.hpp>
#include <SFML/Graphics/Drawable.hpp>
#include <SFML/Graphics/Transformable.hpp>
#include <SFML/Graphics/VertexArray.hpp>

#include <vector>


namespace thor
{


class THOR_API ConcaveShape : public sf::Drawable, public sf::Transformable
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
                                    ConcaveShape();

                                    ConcaveShape(const sf::Shape& shape);

        void                        setPointCount(std::size_t count);

        std::size_t                 getPointCount() const;

        void                        setPoint(std::size_t index, sf::Vector2f position);

        sf::Vector2f                getPoint(std::size_t index) const;

        void                        setFillColor(const sf::Color& fillColor);

        void                        setOutlineColor(const sf::Color& outlineColor);

        sf::Color                   getFillColor() const;

        sf::Color                   getOutlineColor() const;

        void                        setOutlineThickness(float outlineThickness);

        float                       getOutlineThickness() const;

        sf::FloatRect               getLocalBounds() const;

        sf::FloatRect               getGlobalBounds() const;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private types
    private:
        struct TriangleGenerator;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private member functions
    private:
        // Renders the shape to target.
        virtual void                draw(sf::RenderTarget& target, sf::RenderStates states) const;

        // Computes how the shape can be split up into convex triangles.
        void                        ensureDecomposed() const;

        // Forms the outline out of the given edges.
        void                        ensureOutlineUpdated() const;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        std::vector<sf::Vector2f>               mPoints;
        sf::Color                               mFillColor;
        sf::Color                               mOutlineColor;
        float                                   mOutlineThickness;

        mutable sf::VertexArray                 mTriangleVertices;
        mutable std::vector<sf::ConvexShape>    mOutlineShapes;
        mutable sf::FloatRect                   mLocalBounds;
        mutable bool                            mNeedsDecomposition;
        mutable bool                            mNeedsOutlineUpdate;
};


} // namespace thor

#endif // THOR_CONCAVESHAPE_HPP