问d3 SVG平移和缩放一组，但仅平移另一组

EN

function move() {

    var t = d3.event.translate;
    var s = d3.event.scale;
    var h = height / 4;


    t[ 0 ] = Math.min(
        ( width / height ) * ( s - 1 ),
        Math.max( width * ( 1 - s ), t[ 0 ] )
    );

    t[ 1 ] = Math.min(
        h * ( s - 1 ) + h * s,
        Math.max( height * ( 1 - s ) - h * s, t[ 1 ] )
    );

    zoom.translate( t );
    ctrl.g.attr( 'transform', 'translate(' + t + ')scale(' + s + ')' );
    ctrl.points.attr( 'transform', 'translate(' + t + ')' );

    //adjust the country hover stroke width based on zoom level
    d3.selectAll( '.country' ).style( 'stroke-width', 1.5 / s );

}