我想知道这段代码什么意思

Question

void CMyListCtrl::DrawGradient(CDC *pDC, CRect const *rc, COLORREF clrTop, COLORREF clrBottom)
{

GRADIENT_RECT gRect = {0,1};
TRIVERTEX vert[2] =
{ {rc->left,rc->top,(COLOR16)(GetRValue(clrTop)< {rc->right,rc->bottom,(COLOR16)(GetRValue(clrBottom)< };
::GradientFill(pDC->m_hDC,vert,2,&gRect,1,GRADIENT_FILL_RECT_V);

    POINT pt;
    pt.x=rc->left+10;
    pt.y=rc->top;

    RECT rect;
    rect.bottom=rc->bottom;
    rect.left=rc->left;
    rect.right=rc->right;
    rect.top=rc->top;

}