javascript - d3.js(v4) manual zoom and wheel zoom is not matching -


d3 version v4 have button zoom svg element,and aready call d3.zoom; when drag svg,then click button.the svg reverse oraginal position! seem zoom.event.transform independent variable. how can matching zoom , manual transfom?

there code:

var g = svg.select("g"); var zoom = d3.zoom()     .scaleextent([1 / 2, 10]); zoom.on("zoom", function () {             g.attr("transform", d3.event.transform);         }) svg.call(zoom);

there bottonclick code

 function zoomextendclick() {         var maingroup = svg.select("g");         var transform = d3.zoomtransform(maingroup);         if (transform == null) {             transform.k = 1;             transform.x = 0;             transform.y = 0;         }         transform.k += 0.1;         transform.x -= width / 2 * 0.1;         transform.y -= height / 2 * 0.1;          zoom.scaleto(maingroup, transform.k);     };

and transform(x,y)has same problem.

how matching them? there code :https://jsfiddle.net/cloudching/mfb59gb2/10/


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