Polygon

用当前的笔绘制一个由两个或多个点（顶点）连接的多边形。

BOOL Polygon(
   LPPOINT lpPoints,
   int nCount
);

lpPoints

指向一个指定多边形顶点的点。数组中的每一点都是一个点结构或一个CPoint对象。

nCount

指定数组中顶点的数量。

返回值

如果函数成功，则非零;否则0。

 void CDCView::DrawPolygon(CDC* pDC)
 {
    // find the client area
    CRect rect;
    GetClientRect(rect);

    // draw with a thick blue pen
    CPen penBlue(PS_SOLID, , RGB(, , ));
    CPen* pOldPen = pDC->SelectObject(&penBlue);

    // and a solid red brush
    CBrush brushRed(RGB(, , ));
    CBrush* pOldBrush = pDC->SelectObject(&brushRed);

    // Find the midpoints of the top, right, left, and bottom
    // of the client area. They will be the vertices of our polygon.
    CPoint pts[];
    pts[].x = rect.left + rect.Width()/;
    pts[].y = rect.top;

    pts[].x = rect.right;
    pts[].y = rect.top + rect.Height()/;

    pts[].x = pts[].x;
    pts[].y = rect.bottom;

    pts[].x = rect.left;
    pts[].y = pts[].y;

    // Calling Polygon() on that array will draw three lines
    // between the points, as well as an additional line to
    // close the shape--from the last point to the first point
    // we specified.
    pDC->Polygon(pts, );

    // Put back the old objects.
    pDC->SelectObject(pOldPen);
    pDC->SelectObject(pOldBrush);
 }