如何正确画出有一定宽度的线段

Question

我用下面的代码画线,宽度为theApp.m_daywidth-1,但在线的结尾处
总有一个圆形帽子.如何去掉它.我试过设置线的类型的方法,但不行设置线的类型
   DWORD dwPenStyle = PS_GEOMETRIC |           // Pen is geometric
                      PS_DASH |                // Pen is dashed
                      PS_ENDCAP_SQUARE |       // End caps are square
                      PS_JOIN_ROUND       ;           // Joins are round##############################################################
画线
CPen pen;
long col;
int left=pState->m_rect.left-m_scrollPos.x ;
long top=theApp.GetStateTop(EquState)-m_scrollPos.y;
long botton=top+EquState->m_rect.bottom-EquState->m_rect.top ; col=COLOR_WHITE;
pen.CreatePen(PS_SOLID, theApp.m_daywidth-1, col);
CPen* tmpPen = pDC->SelectObject(&pen);
pDC->MoveTo(left+theApp.m_daywidth/2,top);
pDC->LineTo(left+theApp.m_daywidth/2,botton);
pDC->SelectObject(tmpPen);

Answer 1

不画线,改画一个矩形
pDC->FillRect(CRect(100,100,100+100,100+10),&brush);

Answer 2

使用ExtCreatePen LOGBRUSH lb;
lb.lbStyle = BS_SOLID;
lb.lbColor = RGB(0,0,255);
lb.lbHatch = 0;
HPEN hpen = ExtCreatePen(PS_GEOMETRIC | PS_SOLID | PS_ENDCAP_FLAT,
20,
&lb,
0,
0);
CDC *pDC = GetDC();
pDC->SetMiterLimit(20);
CPen pen;
pen.Attach(hpen);
CPen *pOldPen = pDC->SelectObject(&pen);
pDC->MoveTo(10,10);
pDC->LineTo(50,60);
pDC->SelectObject(pOldPen);
pen.Detach();
ReleaseDC(pDC);

Answer 3

GDI不支持宽度超过1的非实线，请使用GDI+.