CRect::CenterPoint

Artikel
06/09/2015

Berechnet den Mittelpunkt der CRect durch Hinzufügen der linken und rechten Werte und das Division durch zwei und Hinzufügen des oberen und unteren Werte und das Division durch zwei.

CPoint CenterPoint( ) const throw( );

Rückgabewert

Ein Objekt, das CPoint der Mitte von CRect ist.

Beispiel

// Code from this OnPaint() implementation can be pasted into your own application 
// to draw lines that would look like a letter "Y" within your dialog. 
void CMyDlg::OnPaint()
{
   CPaintDC dc(this); // device context for painting 

   // get the size and position of the client area of  
   // your window

   CRect rect;
   GetClientRect(&rect);

   // Move the current pen to the top left of the window. We call the 
   // TopLeft() member of CRect here and it returns a CPoint object we 
   // pass to the override of CDC::MoveTo() that accepts a CPoint.

   dc.MoveTo(rect.TopLeft());

   // Draw a line from the top left to the center of the window. 
   // CenterPoint() gives us the middle point of the window as a 
   // CPoint, and since CDC::LineTo() has an override that accepts a 
   // CPoint, we can just pass it along.

   dc.LineTo(rect.CenterPoint());

   // Now, draw a line to the top right of the window. There's no 
   // CRect member which returns a CPoint for the top right of the 
   // window, so we'll reference the CPoint members directly and call 
   // the CDC::LineTo() override which takes two integers.

   dc.LineTo(rect.right, rect.top);

   // The top part of the "Y" is drawn. Now, we'll draw the stem. We
   // start from the center point.

   dc.MoveTo(rect.CenterPoint());

   // and then draw to the middle of the bottom edge of the window. 
   // We'll get the x-coordinate from the x member of the CPoint 
   // returned by CenterPoint(), and the y value comes directly from 
   // the rect.

   dc.LineTo(rect.CenterPoint().x, rect.bottom);
}