Zooming In on a Selection: Step 6

/* Set the source and destination rectangles for painting */   
SetRect(&rLeadSource, 0, 0, LeadBitmap.GetWidth(), LeadBitmap.GetHeight());   
SetRect(&rLeadDest, 0, 0, LeadBitmap.GetWidth(), LeadBitmap.GetHeight());   
/* Update the global variables for keeping track of the display */   
DisplayLeft = 0;   
DisplayTop = 0;   
DisplayWidth = LeadBitmap.GetWidth();   
DisplayHeight = LeadBitmap.GetHeight();   
/* Repaint the whole client area */   
::InvalidateRect(this->m_hWnd,NULL,FALSE);   
  

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