如何将 JQuery 滑块与每个数据点的 d3 垂直线交互

Question

我正在尝试创建一个交互式滑块，使用来自每个所选数据点的垂直线缩放和过滤数据范围。我不确定如何在每个数据点上绘制每条垂直线，以便滑块可以缩放和过滤此数据范围内的垂直线。目前，我可以在每个数据点和一条垂直线上绘制圆圈（参见附加的输出图），但我想在这些圆圈顶部绘制垂直线，或者如果 d3 有某种方法可以只为每个数据点绘制垂直线。我是 d3 的新手，非常感谢您的反馈！以下是我到目前为止从其他有用网站学到的东西。

/* implementation heavily influenced by http://bl.ocks.org/1166403 */

// define dimensions of graph
var m = [80, 80, 80, 80]; // margins
var w = 1000 - m[1] - m[3]; // width
var h = 350 - m[0] - m[2]; // height

// create a simple data array that we'll plot with a line (this array represents only the Y values, X will just be the index location)
var data = [0];
for (var i = 1; i < 1000; i++) {
  var sign = Math.random() > 0.5 ? +1 : -1;
  data.push(data[i - 1] + sign * Math.random());
}

// X scale will fit all values from data[] within pixels 0-w
var x = d3.scale.linear().domain([0, data.length]).range([0, w]);
// Y scale will fit values from 0-10 within pixels h-0 (Note the inverted domain for the y-scale: bigger is up!)
var y = d3.scale.linear().domain([d3.min(data), d3.max(data)]).range([h, 0]);

// Add an SVG element with the desired dimensions and margin.
var graph = d3.select("#graph").append("svg:svg")
  .attr("width", w + m[1] + m[3])
  .attr("height", h + m[0] + m[2])
  .append("svg:g")
  .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

// create yAxis
var xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(3);
// Add the x-axis.
graph.append("svg:g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + h + ")")
  .call(xAxis);

// create left yAxis
var yAxisLeft = d3.svg.axis().scale(y).ticks(4).orient("left");
// Add the y-axis to the left
graph.append("svg:g")
  .attr("class", "y axis")
  .attr("transform", "translate(-25,0)")
  .call(yAxisLeft);

var clip = graph.append("defs").append("svg:clipPath")
  .attr("id", "clip")
  .append("svg:rect")
  .attr("id", "clip-rect")
  .attr("x", "0")
  .attr("y", "0")
  .attr("width", w)
  .attr("height", h);


var circle = graph.selectAll("circle")
  .data(data);

circle.enter()
  .append("circle")
  .attr("cx", function(d, i) {
    return x(i)
  })
  .attr("cy", function(d) {
    return y(d)
  })
  .attr("class", "circle")
  .attr("r", 2)
  .attr("fill", "red");

var verticalLine = graph.append('line')
  .attr({
    'x1': 0,
    'y1': 0,
    'x2': 0,
    'y2': h
  })
  .attr("stroke", "steelblue")
  .attr('class', 'verticalLine');

function zoom(begin, end) {
  x.domain([begin, end - 1]);

  var t = graph.transition().duration(0);

  var size = end - begin;
  var step = size / 10;
  var ticks = [];
  for (var i = 0; i <= 10; i++) {
    ticks.push(Math.floor(begin + step * i));
  }

  xAxis.tickValues(ticks);

  t.select(".x.axis").call(xAxis);
  t.select('.path').attr("d", verticalLine(data));
}

$(function() {
  $("#slider-range").slider({
    range: true,
    min: 0,
    max: 1000,
    values: [0, 1000],
    slide: function(event, ui) {
      var begin = d3.min([ui.values[0], data.length]);
      var end = d3.max([ui.values[1], 0]);
      console.log("begin:", begin, "end:", end);

      zoom(begin, end);
    }
  });
});

/* tell the SVG path to be a thin blue line without any area fill */

path {
  stroke: steelblue;
  stroke-width: 1;
  fill: none;
}

.axis {
  shape-rendering: crispEdges;
}

.x.axis line {
  stroke: lightgrey;
}

.x.axis .minor {
  stroke-opacity: .5;
}

.x.axis path {
  display: none;
}

.y.axis line,
.y.axis path {
  fill: none;
  stroke: #000;
}

<script src="https://mbostock.github.com/d3/d3.v2.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js"></script>
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/ui-lightness/jquery-ui.css" type="text/css" media="all" />
<div id="graph" class="aGraph"></div>
<div id="slider-range" style="width: 80%px; margin-left:10%; margin-right:10%"></div>

输出

Answer 1

要添加线条，只需再重复一次您对圆圈所做的操作。

/* implementation heavily influenced by http://bl.ocks.org/1166403 */

// define dimensions of graph
var m = [80, 80, 80, 80]; // margins
var w = 1000 - m[1] - m[3]; // width
var h = 350 - m[0] - m[2]; // height

// create a simple data array that we'll plot with a line (this array represents only the Y values, X will just be the index location)
var data = [0];
for (var i = 1; i < 50; i++) {
  var sign = Math.random() > 0.5 ? +1 : -1;
  data.push(data[i - 1] + sign * Math.random());
}

// X scale will fit all values from data[] within pixels 0-w
var x = d3.scale.linear().domain([0, data.length]).range([0, w]);
// Y scale will fit values from 0-10 within pixels h-0 (Note the inverted domain for the y-scale: bigger is up!)
var y = d3.scale.linear().domain([d3.min(data), d3.max(data)]).range([h, 0]);

// Add an SVG element with the desired dimensions and margin.
var graph = d3.select("#graph").append("svg:svg")
  .attr("width", w + m[1] + m[3])
  .attr("height", h + m[0] + m[2])
  .append("svg:g")
  .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

// create yAxis
var xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(3);
// Add the x-axis.
graph.append("svg:g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + h + ")")
  .call(xAxis);

// create left yAxis
var yAxisLeft = d3.svg.axis().scale(y).ticks(4).orient("left");
// Add the y-axis to the left
graph.append("svg:g")
  .attr("class", "y axis")
  .attr("transform", "translate(-25,0)")
  .call(yAxisLeft);

var clip = graph.append("defs").append("svg:clipPath")
  .attr("id", "clip")
  .append("svg:rect")
  .attr("id", "clip-rect")
  .attr("x", "0")
  .attr("y", "0")
  .attr("width", w)
  .attr("height", h);


var circle = graph.selectAll("circle")
  .data(data);

circle.enter()
  .append("circle")
  .attr("cx", function(d, i) {
    return x(i)
  })
  .attr("cy", function(d) {
    return y(d)
  })
  .attr("class", "circle")
  .attr("r", 2)
  .attr("fill", "red");

var verticalLine = graph.selectAll(".vertical-line")
  .data(data);

verticalLine.enter()
  .append("line")
  .attr("x1", function(d, i) {
    return x(i)
  })
  .attr("x2", function(d, i) {
    return x(i)
  })
  .attr({
    y1: 0,
    y2: h,
    stroke: 'steelblue',
    class: 'vertical-line'
  });

function zoom(begin, end) {
  x.domain([begin, end - 1]);

  var t = graph.transition().duration(0);

  var size = end - begin;
  var step = size / 10;
  var ticks = [];
  for (var i = 0; i <= 10; i++) {
    ticks.push(Math.floor(begin + step * i));
  }

  xAxis.tickValues(ticks);

  t.select(".x.axis").call(xAxis);
  t.select('.path').attr("d", verticalLine(data));
}

$(function() {
  $("#slider-range").slider({
    range: true,
    min: 0,
    max: 1000,
    values: [0, 1000],
    slide: function(event, ui) {
      var begin = d3.min([ui.values[0], data.length]);
      var end = d3.max([ui.values[1], 0]);
      console.log("begin:", begin, "end:", end);

      zoom(begin, end);
    }
  });
});

/* tell the SVG path to be a thin blue line without any area fill */

path {
  stroke: steelblue;
  stroke-width: 1;
  fill: none;
}

.axis {
  shape-rendering: crispEdges;
}

.x.axis line {
  stroke: lightgrey;
}

.x.axis .minor {
  stroke-opacity: .5;
}

.x.axis path {
  display: none;
}

.y.axis line,
.y.axis path {
  fill: none;
  stroke: #000;
}

<script src="https://mbostock.github.com/d3/d3.v2.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.8.23/jquery-ui.min.js"></script>
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/themes/ui-lightness/jquery-ui.css" type="text/css" media="all" />
<div id="graph" class="aGraph"></div>
<div id="slider-range" style="width: 80%px; margin-left:10%; margin-right:10%"></div>

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