grad()

float fl::FlowFieldFloat::Perlin2D::grad ( int h, float x, float y )

staticprivate

Definition at line 96 of file flowfield.cpp.hpp.

                                                                       {
    switch (h & 7) {
    case 0:
        return x + y;
    case 1:
        return -x + y;
    case 2:
        return x - y;
    case 3:
        return -x - y;
    case 4:
        return x;
    case 5:
        return -x;
    case 6:
        return y;
    default:
        return -y;
    }
}

References fl::FL_NO_EXCEPT, fl::x, and fl::y.