分形之正方形折线

static void FractalSquare(const Vector3& vStart, const Vector3& vEnd, Vector3* pVertices)
{
    Vector3 vSub = vEnd - vStart;
    Yreal len = D3DXVec3Length(&vSub);

    pVertices[0] = vStart;
    pVertices[5] = vEnd;

    Vector3 vMiddle;
    vMiddle.x = (vStart.x + vStart.y + vEnd.x - vEnd.y) / 2;
    vMiddle.y = (vEnd.x + vEnd.y + vStart.y - vStart.x) / 2;
    vMiddle.z = 0.0f;

    pVertices[1] = vStart + vSub/3.0f;
    pVertices[4] = vStart + vSub/1.5f;

    pVertices[2] = (vStart + vMiddle*2.0f)/3.0f;
    pVertices[3] = (vEnd + vMiddle*2.0f)/3.0f;
}