private boolean mouseYinBlackArea ( int x, int y ) {
        if ( y < 0  || x < 0 )
            return true;

        if ( y > ConfigurationData.getInstance ().getHeight () / 2 - 1 )
            return false;

        x = x % ( 3 * ConfigurationData.getInstance ().getEdge () );

        if ( x < mapModel.slopeGap ( y ) || x > 2 * ConfigurationData.getInstance ().getEdge () - mapModel.slopeGap ( y ) )
            return true;

        return false;
    }