blend2d.c

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//----------------------------------------------------------------------------------------
/*
    Allows weighted blending of values defined by their 2D position in space.
*/
class Blend2D<Class T>
{
    private ref array<vector> m_Positions;
    private ref array<T>      m_Values;
    private ref array<float>  m_Weights;
 
    //----------------------------------------------------------------------------------------
    void Blend2D()
    {
        m_Positions = {};
        m_Weights   = {};
        m_Values    = {};
    }
 
    //----------------------------------------------------------------------------------------
    void Insert(float posX, float posY, T value)
    {
        m_Positions.Insert(Vector(posX, posY, 0));
        m_Values.Insert(value);
        m_Weights.Insert(0);
    }
 
    //----------------------------------------------------------------------------------------
    void Clear()
    {
        m_Positions.Clear();
        m_Values.Clear();
        m_Weights.Clear();
    }
 
    //----------------------------------------------------------------------------------------
    /*
        Evaluate and return the result of the blend sampled at coordinate [posX, posY].
    */
    T Blend(float posX, float posY)
    {
        vector samplePosition = Vector(posX, posY, 0);
        Math3D.BlendCartesian(samplePosition, m_Positions, m_Weights);
 
        T result;
        int numValues = m_Values.Count();
        for (int v = 0; v < numValues; ++v)
        {
            result += (m_Values[v] * m_Weights[v]);
        }
 
        return result;
    }
 
}
 
//----------------------------------------------------------------------------------------
typedef  Blend2D<vector> Blend2DVector;