MFC GDI绘图

void CMFCApplication10View::OnPaint()
{
    CPaintDC dc(this); // CPaintDC是OnPaint()里专用的，其他函数里用CClientDC

    /*画直线，客户区域*/
    CRect rect; //矩形区域对象
    GetClientRect(rect); //获得客户区域，赋值给rect
    dc.MoveTo(rect.right, rect.top); //从指定点开始
    dc.LineTo(rect.left, rect.bottom);

    /*指定矩形区域内画图*/
    CRect rect1(20, 20, 220, 120);
    dc.Rectangle(rect1); //画矩形
    dc.Ellipse(rect1); //画椭圆    

    /*椭圆圆弧，截取椭圆的一部分*/
    CRect rect2(230, 20, 430, 120);
    CPoint point1(330, 0);
    CPoint point2(230, 70);
    dc.Arc(rect2, point1, point2);//p1、p2与圆心的连线，来截取椭圆弧

    /*折线*/
    //dc.MoveTo(50, 50); //起始点
    //POINT point[3] = { 100, 80, 150, 50, 200, 80 }; //3个点
    //dc.PolylineTo(point, 3); //从起始点依次连线，共4个点
    POINT point[4] = {50,50,100, 80, 150, 50, 200, 80}; //4个点，与上三行等效
    dc.Polyline(point, 4);

    /*曲线*/
    dc.PolyBezier(point, 4);
}

    CRect rect3(440, 20, 640, 220);
    CPoint p3(540, 20);
    CPoint p4(440, 120);
    dc.Pie(rect3, p3, p4);//饼形图，过圆心
    //dc.Chord(rect3, p3, p4); //弦+圆弧
    //dc.Arc(rect3, p3, p4); //圆弧