Question

VC6.0 MFC求助，画直线

MFC小白一个，求教单文档的MFC程序，用VC++6.0怎么画直线，要求鼠标左键点两次取两个点连成线

不要网上搜的那些坑！我都搜遍了没一个能对上的！最好截图

Answer 1

void ClinedemoView::OnLButtonDown(UINT nFlags, CPoint point)
{
if ( m_bDraw == FALSE )
{
m_pt = point;
m_bDraw = TRUE;
}
else
{
m_bDraw = FALSE;
HDC hdc;
hdc=::GetDC(m_hWnd);//m_hWnd是当前view窗口的句柄
MoveToEx(hdc,m_pt.x,m_pt.y,NULL);//移动画笔到起始点
LineTo(hdc,point.x,point.y);
::ReleaseDC(m_hWnd,hdc);//作完图后一定要释放DC
}
CView::OnLButtonDown(nFlags, point);
}

m_bDraw在构造函数中初始值为false

追问

我没说明白。。。那个要求两个点用圆点显现出来

追答

CBrush brush;
brush.CreateSolidBrush(RGB(0,0,0));
HDC hdc;
hdc=::GetDC(m_hWnd);//m_hWnd是当前view窗口的句柄
::SelectObject(hdc, brush);
if ( m_bDraw == FALSE )
{
::Ellipse(hdc, point.x-4, point.y-4, point.x+4, point.y+4);
m_pt = point;
m_bDraw = TRUE;
}
else
{
m_bDraw = FALSE;
::Ellipse(hdc, point.x-4, point.y-4, point.x+4, point.y+4);
MoveToEx(hdc,m_pt.x,m_pt.y,NULL);//移动画笔到起始点
LineTo(hdc,point.x,point.y);
::ReleaseDC(m_hWnd,hdc);//作完图后一定要释放DC
}

追问

有QQ么我加你问吧

追答

代码优化一下:
void CLineDemoView::OnLButtonDown(UINT nFlags, CPoint point)
{
CBrush brush(RGB(0,0,0));
HDC hdc;
hdc=::GetDC(m_hWnd);//m_hWnd是当前view窗口的句柄
::SelectObject(hdc, brush);
::Ellipse(hdc, point.x-4, point.y-4, point.x+4, point.y+4);
if ( m_bDraw == FALSE )
{
m_pt = point;
m_bDraw = TRUE;
}
else
{
m_bDraw = FALSE;
MoveToEx(hdc,m_pt.x,m_pt.y,NULL);
LineTo(hdc,point.x,point.y);
}
::ReleaseDC(m_hWnd,hdc);
CView::OnLButtonDown(nFlags, point);
}

追问

前辈，给个QQ呗还很多问题呢给你追分

追答

468081499