Multimedia/ConcaveShape.hpp

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//
// Thor C++ Library
// Copyright (c) 2011 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/Math/TriangulationFigures.hpp>
#include <Thor/Detail/Swap.hpp>
#include <Thor/Config.hpp>

#include <SFML/Graphics/Drawable.hpp>
#include <SFML/Graphics/Shape.hpp>

#include <vector>


namespace thor
{


class THOR_API ConcaveShape : public sf::Drawable
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
                                    ConcaveShape();
                            
                                    ConcaveShape(const sf::Shape& shape);

        void                        Swap(ConcaveShape& other);
        
        void                        AddPoint(float x, float y, const sf::Color& color, const sf::Color& outlineColor = sf::Color(0,0,0));
                                
        void                        AddPoint(sf::Vector2f position, const sf::Color& color, const sf::Color& outlineColor = sf::Color(0,0,0));

        void                        SetOutlineThickness(float outlineThickness);
        
        float                       GetOutlineThickness() const;
        

    // ---------------------------------------------------------------------------------------------------------------------------
    // Private types
    private:     
        struct Point : Vertex
        {
                                        Point(sf::Vector2f position, const sf::Color& fillColor, const sf::Color& outlineColor);

            sf::Color                   fillColor;
            sf::Color                   outlineColor;
        };
        
        // Container typedefs
        typedef std::vector<sf::Shape>      ShapeContainer;
        typedef std::vector<Point>          PointContainer;
        typedef std::vector< Edge<Point> >  EdgeContainer;

        struct TriangleGenerator;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private member functions
    private:
        // Renders the shape to target.
        virtual void                Render(sf::RenderTarget& target, sf::Renderer& renderer) const;
        
        // Computes how the shape can be split up into convex triangles.
        void                        Decompose() const;
                
        // Forms the outline out of the given edges.
        void                        FormOutline() const;
                

    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        PointContainer              mPoints;
        float                       mOutlineThickness;

        mutable EdgeContainer       mEdges;
        mutable ShapeContainer      mTriangleShapes;
        mutable ShapeContainer      mEdgeShapes;
        mutable bool                mNeedsTriangleUpdate;
        mutable bool                mNeedsEdgeUpdate;
};

THOR_GLOBAL_SWAP(ConcaveShape)



} // namespace thor

#endif // THOR_CONCAVESHAPE_HPP