ArrowField.h

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#ifndef GlobeEngine_ArrowField_h
#define GlobeEngine_ArrowField_h

#include "OpenGL_Includes.h"
#include "DrawableComponent.h"
#include <string>

namespace geFlow {
    struct ArrowInfo{
        vmml::Vector3f pos;
        vmml::Vector3f dir;
    };

    // An arrow is defined by shaft, peak and two wing 
    // points in CCW and CW order. Center is in the middle
    //              2 \
    //                 \
    //     0 -----C---- 1
    //                 /
    //              3 /
    struct Arrow {
        vmml::Vector4d lineVectors[4];
    };

    class ArrowField : public ge::DrawableComponent
    {
    public:
        ArrowField();
        ~ArrowField();
        void clear();
        void create();
        void draw(std::shared_ptr<ge::Camera> _cam);
        void update();
        void createVAO();
        void addArrow(ArrowInfo _arrowInfo);
        void setArrowLength(float _length);
        void setMinMaxArrows();

        int getArrowCount() const;

    private:
        void rotateArrowAccordingToDirection(int _idx);
        void setPositionBuffer();
        void setColorBuffer();
        void setIndexBuffer();
        vmml::Vector3f getColorForDir(vmml::Vector3f _dir);

        Arrow base; // arrow pointing xAxis
        std::vector<Arrow> arrows;
        std::vector<ArrowInfo> arrowInfos;
        float arrowLength;
        float minLenght;
        float maxLenght;
    };
}
#endif