Interface PointXY

interface PointXY {
    a?: number;
    b?: number;
    c?: number;
    d?: number;
    e?: number;
    f?: number;
    g?: number;
    h?: number;
    i?: number;
    j?: number;
    k?: number;
    l?: number;
    m?: number;
    n?: number;
    o?: number;
    p?: number;
    q?: number;
    r?: number;
    s?: number;
    t?: number;
    u?: number;
    v?: number;
    w?: number;
    x: number;
    y: number;
    z?: number;
}