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如何在d3.js图中转换多行？

[英]How to transition multiple lines in d3.js plot?

 原文  2016-06-21 18:21:49  5   1    javascript/ d3.js/ transitions/ updating

问题描述

我一直在尝试使Mike Bostock的链接转换脚本适合多行工作，但我无法使其正常工作。 第一次显示后，线条和标签从图中飞出，不再显示，而所有内容都已更新（检查javascript控制台时，线条的值会发生变化）。 我不明白我在做什么错。 我将在下面发布（冗长的）代码（对长度表示歉意）。 我将不胜感激，谢谢！ 

<!DOCTYPE html>
<head>
<title>Modified Chained Transitions</title>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v3.min.js"></script>
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}

text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

form {
  position: absolute;
  right: 10px;
  top: 10px;
}

</style>
</head>
<body>
<br>
  <button type="button"> Request data</button>

  <div id='chart'> </div>
</body>
<script>

var margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = 750 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%Y%m%d").parse;

var xScale = d3.time.scale()
    .range([0, width]);

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

var color = d3.scale.category10();

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

var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left");

var line = d3.svg.line()
                .interpolate("basis")
                .x(function(d) { return xScale(d.date); })
                .y(function(d) { return yScale(d.temperature); });

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 + ")");


var getNewData = function() {
    var data = [];
    var counter = 0;
  function generate(){
        var startDate = new Date;
      counter += 1;
        var range = counter % 2 === 0 ? 10 : 100; 
        for (i = 0; i < 100; i++) {
            data[i] = {"date": new Date(startDate - i),
                "New York": Math.random() * (range - 1), 
                "San Francisco": Math.random() * (range - 1),
                "Austin": Math.random() * (range - 10)};
        }
        return data;
    } 
    return {
        new: function () {return generate()}
    };
}; // function getNewData() 

var newData = getNewData();
data = newData.new();

color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));

var cities = color.domain().map(function(name) {
  return {
    name: name,
    values: data.map(function(d) {
      return { date: d.date, temperature: +d[name]};
    })
  };
});

xScale.domain(d3.extent(data, function(d) { return d.date; }));
yScale.domain([
  d3.min(cities, function(c) {
    return d3.min(c.values, function(v) { return v.temperature; }); }),
  d3.max(cities, function(c) {
    return d3.max(c.values, function(v) { return v.temperature; }); })
]);

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

svg.append("g")
        .attr("class", "y axis")
        .call(yAxis)
    .append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
        .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text("Temperature (ºF)");

var city = svg.selectAll(".city")
    .data(cities)
    .enter().append("g")
    .attr("class", "city");

city.append("path")
    .attr("class", "line")
    .attr("d", function(d) { return line(d.values); })
    .style("stroke", function(d) { return color(d.name); });

city.append("text")
    .datum(function(d) { return {name: d.name, values: d.values[0]}; })
        .attr("class", "label")
    .attr("transform", function(d) { return "translate(" +
      xScale(d.values.date) +  "," + yScale(d.values.temperature) + ")"; })
    .attr("x", 3)
    .attr("dy", ".35em")
    .text(function(d) { return d.name; });

d3.selectAll("button").on("click", change);

function change() {

    data = newData.new();
    color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; }));
    cities = color.domain().map(function(name) {
      return {
        name: name,
        values: data.map(function(d) {
          return { date: d.date, temperature: +d[name]};
        })
      };
    });
    console.log(cities[0].values[0]);

    xScale.domain(d3.extent(data, function(d) { return d.date; }));
    yScale.domain([
      d3.min(cities, function(c) {
        return d3.min(c.values, function(v) { return v.temperature; }); }),
      d3.max(cities, function(c) {
        return d3.max(c.values, function(v) { return v.temperature; }); })
    ]);

    var t0 = svg.transition().duration(750);
    t0.selectAll(".line")
        .attr("d", function(cities) { return line(cities.values); })
        .style("stroke", function(cities) { return color(cities.name); });
    t0.selectAll(".label").attr("transform", 
         "translate(0,0)").text(function(cities) { return cities.name; });


    var t1 = t0.transition();
//  t1.selectAll(".line").attr("d", line(data));
//  t1.select(".line")
    t1.selectAll(".line")
//      t1.selectAll(".city")
        .attr("d", function(cities) { return line(cities.values); })
        .style("stroke", function(cities) { return color(cities.name); });
    t1.select(".y.axis").call(yAxis);
    t1.select(".x.axis").call(xAxis);
    t1.select(".label")
        .attr("transform", function(d) { return "translate(" +
      xScale(d.values.date) +  "," + 
            yScale(d.values.temperature) + ")"; });
} // function change() 

</script>
</html>

1 个解决方案

解决方案1
 1 已采纳  2016-06-22 00:21:52

我可以帮助您解决过渡问题，但不确定您要尝试“束缚”什么。 在链接的示例中，Bostock将一条线交换为另一条线（转换1），然后将该线适合新的域（转换2）。 您似乎不想交换线，因此您适合一个新域，然后将线过渡到该域（过渡1），但是过渡2是什么？

现在，回答您的更直接的问题，为什么转换不起作用，这仅仅是因为您从未更新过数据。 在链接的示例中，Bostock将两个数据集都绑定到他的直线，然后交换他在line函数中绘制的数据集。 但是，您只能绑定原始数据集。 快速解决方法是： 

function change() {

  ... //<-- get new data

  // bind your new data
  var cities = svg.selectAll(".city")
    .data(cities)

  // sub selection to transition line   
  cities
    .select(".line")
    .transition()
    .duration(750)
    .attr("d", function(d) { return line(d.values); })
    .style("stroke", function(d) { return color(d.name); })

  // concurrent sub selection to move labels
  cities
    .select(".label")
    .transition()
    .duration(750)
    .attr("transform", function(d){
       var last = d.values[0];
       return "translate(" + xScale(last.date) + "," +   yScale(last.temperature) + ")";
    })

}

运行代码： 

 <!DOCTYPE html> <head> <title>Modified Chained Transitions</title> <meta charset="utf-8"> <script src="https://d3js.org/d3.v3.min.js"></script> <style> body { font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; margin: auto; position: relative; width: 960px; } text { font: 10px sans-serif; } .axis path, .axis line { fill: none; stroke: #000; shape-rendering: crispEdges; } .x.axis path { display: none; } .line { fill: none; stroke: steelblue; stroke-width: 1.5px; } form { position: absolute; right: 10px; top: 10px; } </style> </head> <body> <br> <button type="button"> Request data</button> <div id='chart'> </div> </body> <script> var margin = { top: 20, right: 80, bottom: 30, left: 50 }, width = 500 - margin.left - margin.right, height = 500 - margin.top - margin.bottom; var parseDate = d3.time.format("%Y%m%d").parse; var xScale = d3.time.scale() .range([0, width]); var yScale = d3.scale.linear() .range([height, 0]); var color = d3.scale.category10(); var xAxis = d3.svg.axis() .scale(xScale) .orient("bottom"); var yAxis = d3.svg.axis() .scale(yScale) .orient("left"); var line = d3.svg.line() .interpolate("basis") .x(function(d) { return xScale(d.date); }) .y(function(d) { return yScale(d.temperature); }); 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 + ")"); var getNewData = function() { var data = []; var counter = 0; function generate() { var startDate = new Date; counter += 1; var range = counter % 2 === 0 ? 10 : 100; for (i = 0; i < 100; i++) { data[i] = { "date": new Date(startDate - i), "New York": Math.random() * (range - 1), "San Francisco": Math.random() * (range - 1), "Austin": Math.random() * (range - 10) }; } return data; } return { new: function() { return generate() } }; }; // function getNewData() var newData = getNewData(); data = newData.new(); color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; })); var cities = color.domain().map(function(name) { return { name: name, values: data.map(function(d) { return { date: d.date, temperature: +d[name] }; }) }; }); xScale.domain(d3.extent(data, function(d) { return d.date; })); yScale.domain([ d3.min(cities, function(c) { return d3.min(c.values, function(v) { return v.temperature; }); }), d3.max(cities, function(c) { return d3.max(c.values, function(v) { return v.temperature; }); }) ]); svg.append("g") .attr("class", "x axis") .attr("transform", "translate(0," + height + ")") .call(xAxis); svg.append("g") .attr("class", "y axis") .call(yAxis) .append("text") .attr("transform", "rotate(-90)") .attr("y", 6) .attr("dy", ".71em") .style("text-anchor", "end") .text("Temperature (ºF)"); var city = svg.selectAll(".city") .data(cities) .enter().append("g") .attr("class", "city"); city.append("path") .attr("class", "line") .attr("d", function(d) { return line(d.values); }) .style("stroke", function(d) { return color(d.name); }); city.append("text") .datum(function(d) { return { name: d.name, values: d.values[0] }; }) .attr("class", "label") .attr("transform", function(d) { return "translate(" + xScale(d.values.date) + "," + yScale(d.values.temperature) + ")"; }) .attr("x", 3) .attr("dy", ".35em") .text(function(d) { return d.name; }); d3.selectAll("button").on("click", change); function change() { data = newData.new(); color.domain(d3.keys(data[0]).filter(function(key) { return key !== "date"; })); cities = color.domain().map(function(name) { return { name: name, values: data.map(function(d) { return { date: d.date, temperature: +d[name] }; }) }; }); xScale.domain(d3.extent(data, function(d) { return d.date; })); yScale.domain([ d3.min(cities, function(c) { return d3.min(c.values, function(v) { return v.temperature; }); }), d3.max(cities, function(c) { return d3.max(c.values, function(v) { return v.temperature; }); }) ]); var cities = svg.selectAll(".city") .data(cities) cities .select(".line") .transition() .duration(750) .attr("d", function(d) { return line(d.values); }) .style("stroke", function(d) { return color(d.name); }) cities .select(".label") .transition() .duration(750) .attr("transform", function(d) { var last = d.values[0]; return "translate(" + xScale(last.date) + "," + yScale(last.temperature) + ")"; }) svg.selectAll(".y.axis") .transition() .duration(750) .call(yAxis); svg.selectAll(".x.axis") .transition() .duration(750) .call(xAxis); } // function change() </script> </html>

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