Multimedia/Arrow.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_ARROW_HPP
#define THOR_ARROW_HPP

#include <Thor/Config.hpp>

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


namespace thor
{


class THOR_API Arrow : public sf::Drawable
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public static member functions
    public:
        static void                 SetZeroVectorTolerance(float tolerance);
        
        static float                GetZeroVectorTolerance();


    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
        explicit                    Arrow(sf::Vector2f position = sf::Vector2f(), sf::Vector2f direction = sf::Vector2f(),
                                        const sf::Color& color = sf::Color::White, float thickness = 3.f);

        void                        SetDirection(sf::Vector2f direction);
        
        void                        SetDirection(float dirX, float dirY);
        
        sf::Vector2f                GetDirection() const;

        void                        SetThickness(float thickness);
        
        float                       GetThickness() const;
        

    // ---------------------------------------------------------------------------------------------------------------------------
    // Private member functions
    private:
        float                       GetTriangleHeight() const;
        void                        AdaptLine() const;
        void                        AdaptTriangle() const;
        void                        Render(sf::RenderTarget& target, sf::Renderer& renderer) const;


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        float                       mThickness;
        float                       mLength;
        sf::Vector2f                mDirection;
    
        mutable bool                mNeedsShapeUpdate;
        mutable sf::Shape           mLine;
        mutable sf::Shape           mTriangle;
        
        static float                zeroVectorTolerance;
        
};


} // namespace thor

#endif // THOR_ARROW_HPP