event.transform.rescaleY code example
Example: d3 paning
var svg = d3.select("body")
.append("svg")
.attr("width", "100%")
.attr("height", "100%")
.call(d3.behavior.zoom().on("zoom", function () {
svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")")
}))
.append("g")