Question

MFC绘制矩形

Answer 1

在MFC中画矩形Visual Studio 2008
//首先创建一个MFC工程，名为：Rectangle，在界面上放置一个picture control的控件，其关联变量为:m_showRectangle。

//然后添加鼠标事件，OnLButtonDown，OnLButtonUp，OnMouseMove

//BOOL lButtonDownNotUp=FALSE;

//CPoint regionLeftTopTemp;

//CPoint regionRightBottomTemp;

void CRectangleDlg::OnLButtonDown(UINT nFlags, CPoint point)
{

lButtonDownNotUp = TRUE;
RECT rect;
m_showRectangle. GetClientRect( &rect ) ;

if( (point. x<rect. right) && (point. x>rect. left) && (point. y<rect. bottom) && (point. y>rect. top) )
{
regionLeftTopTemp = point;
}

CDialog::OnLButtonDown(nFlags, point);
}

void CRectangleDlg::OnMouseMove(UINT nFlags, CPoint point)
{

RECT rect;
m_showRectangle. GetClientRect( &rect );
if( ( point.x<rect.right ) && ( point.x>rect.left ) && ( point.y<rect.bottom ) && ( point.y>rect.top ) )
{
if( ( lButtonDownNotUp == TRUE )
{
regionRightBottomTemp = point;
CDC * pDC = m_showRectangle. GetWindowDC ();

pDC -> Rectangle( CRect( regionLeftTopTemp, regionRightBottomTemp ) ) ;
}
}

CDialog::OnMouseMove(nFlags, point);
}

void CRectangleDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
lButtonDownNotUp=FALSE;
CDialog::OnLButtonUp(nFlags, point);
}

Answer 2

Rectangle (
Coordinates upperLeft,
Coordinates lowerRight
)

Rectangle (
int left,
int top,
int right,
int bottom
)

在view类的OnDraw函数里添加
pDc->Rectangle(); 参数如上

Answer 3

用4下moveto lineto就可以了。

Answer 4

rect 也行 brush 也行的 要代码 留言