js-d3-zoom怎么区分平移和缩放

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d3-zoom怎么区分平移和缩放, 怎么调节缩放速度

var velocity = 1 / 5;
var scale = Math.pow(d3.event.transform.k, velocity);
var translateY = d3.event.transform.y * velocity;
var translateX = d3.event.transform.x * velocity;

_this.svg.d3.selectAll('rect,path,g,text').attr('transform',
        'translate(' + translateX + ',' + translateY + ') scale(' + scale + ')'
)

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怎么调节缩放速度

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https://blog.csdn.net/cxu123321/article/details/108396886