question: @ Override public boolean onUnit ( Graphics g , int x , int y , int w , int h ) { FontMetrics fm = g . getFontMetrics ( ) ; int l = ( int ) ( m_x * w ) - fm . stringWidth ( m_id ) / 2 ; int t = ( int ) ( m_y * h ) - fm . getHeight ( ) / 2 ; if ( x < l || x > l + fm . stringWidth ( m_id ) + 4 || y < t || y > t + fm . getHeight ( ) + fm . getDescent ( ) + 4 ) { return false ; } return true ; }
target:  Call this function to determine if the point at x,y is on the unit.