D3.js：如何限制分组条形图中的x轴拖动

Question

这是代码http://jsfiddle.net/4tqn7162/1/的链接。如果在svg宽度之后向左或向右拖动条形图，则图完全消失了。我想限制它而不影响缩放操作。谁能帮助我。

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 300 - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;

用于绘制图形的数据

var data = [
   {
       "State": "CA",
       "Under 5 Years": 2704659,
       "5 to 13 Years": 4499890,
       "14 to 17 Years": 2159981,
       "18 to 24 Years": 3853788,
       "25 to 44 Years": 10604510,
       "45 to 64 Years": 8819342,
       "65 Years and Over": 4114496
   },
   {
       "State": "TX",
       "Under 5 Years": 2027307,
       "5 to 13 Years": 3277946,
       "14 to 17 Years": 1420518,
       "18 to 24 Years": 2454721,
       "25 to 44 Years": 7017731,
       "45 to 64 Years": 5656528,
       "65 Years and Over": 2472223
   },
   {
       "State": "NY",
       "Under 5 Years": 1208495,
       "5 to 13 Years": 2141490,
       "14 to 17 Years": 1058031,
       "18 to 24 Years": 1999120,
       "25 to 44 Years": 5355235,
       "45 to 64 Years": 5120254,
       "65 Years and Over": 2607672
   },
   {
       "State": "FL",
       "Under 5 Years": 1140516,
       "5 to 13 Years": 1938695,
       "14 to 17 Years": 925060,
       "18 to 24 Years": 1607297,
       "25 to 44 Years": 4782119,
       "45 to 64 Years": 4746856,
       "65 Years and Over": 3187797
   },
   {
       "State": "IL",
       "Under 5 Years": 894368,
       "5 to 13 Years": 1558919,
       "14 to 17 Years": 725973,
       "18 to 24 Years": 1311479,
       "25 to 44 Years": 3596343,
       "45 to 64 Years": 3239173,
       "65 Years and Over": 1575308
   },
   {
       "State": "PA",
       "Under 5 Years": 737462,
       "5 to 13 Years": 1345341,
       "14 to 17 Years": 679201,
       "18 to 24 Years": 1203944,
       "25 to 44 Years": 3157759,
       "45 to 64 Years": 3414001,
       "65 Years and Over": 1910571
   }];
var x0 = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

var x1 = d3.scale.ordinal();

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

var color = d3.scale.ordinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);

var xAxis = d3.svg.axis()
    .scale(x0)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(d3.format(".1s"));

var svg = d3.select("#chart").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(d3.behavior.zoom().scaleExtent([1, 10]).on("zoom", zoom));

//d3.csv("data.csv", function(error, data) {
var ageNames = d3.keys(data[0]).filter(function(key) { return key !== "State"; });
     console.log("ageNames="+JSON.stringify(ageNames));
data.forEach(function(d) {
    d.ages = ageNames.map(function(name) { return {name: name, value: +d[name]}; });
      console.log("d.ages="+JSON.stringify(d.ages));
  });

  x0.domain(data.map(function(d) { return d.State; }));
  x1.domain(ageNames).rangeRoundBands([0, x0.rangeBand()]);
  y.domain([0, d3.max(data, function(d) { 
      console.log(" before retuen d.ages="+d.ages);
  return d3.max(d.ages, function(d) 
  { console.log("d.value;="+d.value);
  return d.value; }); 
  })]);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".5em")
      .style("text-anchor", "end")
      .text("Population");

var mask = svg.append("defs")
  .append("clipPath")
  .attr("id", "mask")
    .append("rect")
    .attr({
        x: 0,
        y: 0,
      width: width,
      height: height + margin.bottom,
    })

var masked = svg.append("g")
  .attr("clip-path", "url(#mask)")

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

var allStates = masked
  .append("g")
    .attr("class", "allStates");

  var state = svg.selectAll(".state")
      .data(data)
    .enter().append("g")
      .attr("class", "state")
      .attr("transform", function(d) { return "translate(" + x0(d.State) + ",0)"; });

 var state = allStates.selectAll(".state")
  .data(data)
  .enter().append("g")
  .attr("class", "state")
  .attr("transform", function(d) { return "translate(" + x0(d.State) + ",0)"; });

  state.selectAll("rect")
      .data(function(d) { return d.ages; })
    .enter().append("rect")
      .attr("width", x1.rangeBand())
      .attr("x", function(d) { return x1(d.name); })
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); })
      .style("fill", function(d) { return color(d.name); });
var legnColorGap=height/17.5;
  var legend = svg.selectAll(".legend")
      .data(ageNames.slice().reverse())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * legnColorGap + ")"; });
var lwidth=width/75 , lht=height/22,lwidth1=lwidth+2;
  legend.append("rect")
      .attr("x", width - lwidth1)
      .attr("width", lwidth)
      .attr("height", lht)
      .style("fill", color);
var textht=lht/2,textwd=textht+lwidth;
  legend.append("text")
      .attr("x", width - textwd)
      .attr("y", textht)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });
 function zoom() {
svg.select(".allStates").attr("transform", "translate(" + d3.event.translate[0]+",0)scale(" + d3.event.scale + ",1)");
svg.select(".x.axis").attr("transform", "translate(" + d3.event.translate[0]+","+(height)+")").call(xAxis.scale(x0.rangeRoundBands([0, width * d3.event.scale],.5 * d3.event.scale)));
svg.select(".y.axis").call(yAxis);
}

Answer 1

您可以通过添加更改来禁用平移事件

.call（d3.behavior.zoom（）。scaleExtent（[1，10]）。on（“ zoom”，zoom））;

至

.call（d3.behavior.zoom（）。scaleExtent（[1，10]）。on（“ zoom”，zoom））。on（“ mousedown.zoom”，null）;