question: @ Override public void mouseDragged ( MouseEvent e ) { if ( m_mouseState == 1 ) { m_oldMousePos . width = m_newMousePos . width ; m_oldMousePos . height = m_newMousePos . height ; m_newMousePos . width = e . getX ( ) ; m_newMousePos . height = e . getY ( ) ; m_viewPos . width += m_newMousePos . width - m_oldMousePos . width ; m_viewPos . height += m_newMousePos . height - m_oldMousePos . height ; } else if ( m_mouseState == 3 ) { Graphics g = getGraphics ( ) ; if ( m_ZoomBoxColor == null ) { g . setColor ( Color . black ) ; } else { g . setColor ( m_ZoomBoxColor ) ; } if ( m_ZoomBoxXORColor == null ) { g . setXORMode ( Color . white ) ; } else { g . setXORMode ( m_ZoomBoxXORColor ) ; } g . drawRect ( m_oldMousePos . width , m_oldMousePos . height , m_newMousePos . width - m_oldMousePos . width , m_newMousePos . height - m_oldMousePos . height ) ; m_newMousePos . width = e . getX ( ) ; m_newMousePos . height = e . getY ( ) ; g . drawRect ( m_oldMousePos . width , m_oldMousePos . height , m_newMousePos . width - m_oldMousePos . width , m_newMousePos . height - m_oldMousePos . height ) ; g . dispose ( ) ; } }
target:  Performs intermediate updates to what the user wishes to do.