绘制半圆

绘制半圆
，当图形动起来的时候这个半圆也要顺着动。
                    pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*2),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*2))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*3),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*3))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*4),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*4))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*5),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*5))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*6),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*6))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*7),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*7))); pDC->MoveTo(m_ClientRect.CenterPoint().x,m_ClientRect.CenterPoint().y);
pDC->LineTo(m_ClientRect.CenterPoint().x+m_ClientRect.Width()/2*cos(m_dangle+(2*pi/m_nplatevalue)*8),
        m_ClientRect.CenterPoint().y+m_ClientRect.Width()/2*sin(m_dangle+(2*pi/m_nplatevalue*8)));这是那8个直线