Remap function of C different interval mapping

This function is used to realize the mapping between two segmented intervals , Suppose there is A,B Definition of two segmented intervals , Given one in A Internal value , Can be found in B The percentage of the relative starting point in the .

The number of segments of the two intervals should be consistent , The first element of the array is fixed to 0, The last element is the maximum value of the last interval .

 

  public static float remap(float[] srcmap, float[] tomap, float refval)
    {
        if(srcmap.Length!=tomap.Length)
        {
            //Debug.log(" The number of mapping intervals does not match ！{0},{1}", srcmap.Length, tomap.Length);
            return -1;
        }

        if (refval < srcmap[0]) return 0;
        if (refval > srcmap[srcmap.Length - 1]) return 1;
        float tomax = tomap[tomap.Length - 1];

        int rank = 0;
        float srcSubPercent = 0;
        for(int i=0; i<srcmap.Length-1; i++)
        {
            if(refval>srcmap[i] && refval < srcmap[i + 1])
            {
                rank = i;
                srcSubPercent = (refval - srcmap[i]) / (srcmap[i + 1] - srcmap[i]);
                break;
            }
        }

        float basePercent = tomap[rank] / tomax;
        float subPercent = (tomap[rank + 1] - tomap[rank]) / tomax * srcSubPercent;



        return basePercent + subPercent;
    }