D3: Is it possible to zoom+pan one axis and only pan the other?

by sladav

HTML

<script src="https://d3js.org/d3.v3.min.js"></script>

CSS

body {
  position: relative;
  width: 960px;
}

svg {
  font: 10px sans-serif;
  shape-rendering: crispEdges;
}

rect {
  fill: #ddd;
}

.axis path,
.axis line {
  fill: none;
  stroke: #fff;
}

button {
  position: absolute;
  right: 30px;
  top: 30px;
}

JavaScript

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .domain([-width / 2, width / 2])
    .range([0, width]);

var yPan = 0;
var yMin = (-height / 2);
var yMax = (height / 2);

var y = d3.scale.linear()
    .domain([yMin, yMax])
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .tickSize(-height);

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(5)
    .tickSize(-width);

var zoom = d3.behavior.zoom()
    .x(x)
    .scaleExtent([1, 10])
    .on("zoom", zoomed);

var drag = d3.behavior.drag()
    .on("drag", dragging)

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    .call(zoom)
    .call(drag);

svg.append("rect")
    .attr("width", width)
    .attr("height", height);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

d3.select("button").on("click", reset);

function zoomed() {
  svg.select(".x.axis").call(xAxis);
  svg.select(".y.axis").call(yAxis);
}

function dragging(d) {
	yPan = d3.event.dy;
  yMin += yPan;
  yMax += yPan;
  y.domain([yMin, yMax])
  d3.select(".y.axis").call(yAxis)};


function reset() {
  d3.transition().duration(750).tween("zoom", function() {
    var ix = d3.interpolate(x.domain(), [-width / 2, width / 2]),
        iy = d3.interpolate(y.domain(), [-height / 2, height / 2]);
    return function(t) {
      zoom.x(x.domain(ix(t))).y(y.domain(iy(t)));
      zoomed();
    };
  });
}