D3 画笔和缩放错误

Question

我正在尝试使用不同的显示复制以下画笔和缩放示例：https://bl.ocks.org/mbostock/34f08d5e11952a80609169b7917d4172

我不想显示路径，而是想显示多条水平线。在某种程度上，我的程序可以正常工作，但不幸的是，在显示线条的过程中，我破坏了缩放。如果有人能指出正确的方向（并确认我已经以正确的方式修改了代码），我将不胜感激。我看过 Whosebug 上的其他示例，但我认为我对 D3 的了解不足以确定其他人问题的解决方案。

这是我目前的情况：

    <!DOCTYPE html>
<meta charset="utf-8">
<style>

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}

.TIMELINE {
  stroke-width : 2px;
  stroke-opacity:0.5;
}

.TIMELINE2 {
  stroke-width : 0.5px;
  stroke-opacity:0.5;
}

</style>
<svg width="1200" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<!--script src="./data3.js"></script-->
<script>

const data={"summary": [
      {
      "SheetName":  "Line 1",
      "N" : "3922 ",
      "Min" : "19990508 ",
      "Max" : "20180905 ",
      "Range" : "19.34 "
      },
      {
      "SheetName":  "Line 2",
      "N" : "482 ",
      "Min" : "20080215 ",
      "Max" : "20180720 ",
      "Range" : "10.41 "
      },
      {
      "SheetName":  "Line 3",
      "N" : "77 ",
      "Min" : "20080917 ",
      "Max" : "20150514 ",
      "Range" : "6.66 "
      },
      {
      "SheetName":  "Line 4",
      "N" : "60 ",
      "Min" : "20090325 ",
      "Max" : "20171205 ",
      "Range" : "8.76 "
      }],
      "data" :[
      {
      "DMY" : "19990101 ",
      },
      {
      "DMY" : "20190101 ",
      }
]};

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 110, left: 180},
    margin2 = {top: +svg.attr("height")-80, right: margin.right, bottom: 30, left: margin.left},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    height2 = +svg.attr("height") - margin2.top - margin2.bottom;

var parseDate = d3.timeParse("%b %Y");

var x = d3.scaleTime().range([0, width]),
    x2 = d3.scaleTime().range([0, width]),
    y = d3.scaleBand().range([0, height]),
    y2 = d3.scaleBand().range([0, height2]);

var xAxis = d3.axisBottom(x),
    xAxis2 = d3.axisBottom(x2),
    yAxis = d3.axisLeft(y);

var brush = d3.brushX()
    .extent([[0, 0], [width, height2]])
    .on("brush end", brushed);

var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);

svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

var focus = svg.append("g")
    .attr("class", "focus")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var context = svg.append("g")
    .attr("class", "context")
    .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");

//------------------------------------;

  x.domain(d3.extent(data.data, d=> parse(d.DMY)));
  y.domain(data.summary.map(d => d.SheetName));
  x2.domain(x.domain());
  y2.domain(y.domain());

  focus.append("line")
       .datum(data.summary)
       .attr("class", "TIMELINE")
       .attr("stroke", "black");

  focus.selectAll(".TIMELINE")
                       .data(data.summary)
                       .enter()
                       .append("line")
                       .attr("class", "TIMELINE axis--x")
                       .attr("stroke", "black")
                       .attr("x1", d => x(parse(d.Min)))
                       .attr("y1", d => y(d.SheetName))
                       .attr("x2", d => x(parse(d.Max)))
                       .attr("y2", d => y(d.SheetName))      

  context.selectAll(".TIMELINE2")
                       .data(data.summary)
                       .enter()
                       .append("line")
                       .attr("class", "TIMELINE2 axis--x")
                       .attr("stroke", "black")
                       .attr("x1", d => x(parse(d.Min)))
                       .attr("y1", d => y2(d.SheetName))
                       .attr("x2", d => x(parse(d.Max)))
                       .attr("y2", d => y2(d.SheetName))      

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

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

  context.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height2 + ")")
      .call(xAxis2);

  context.append("g")
      .attr("class", "brush")
      .call(brush)
      .call(brush.move, x.range());

  svg.append("rect")
      .attr("class", "zoom")
      .attr("width", width)
      .attr("height", height)
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
      .call(zoom);

//-----------------------------------------;

function brushed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
  var s = d3.event.selection || x2.range();
  x.domain(s.map(x2.invert, x2));

  focus.selectAll(".TIMELINE")
       .attr("x1", d => x(Math.max(parse(d.Min), x.domain()[0])))  
       .attr("x2", d => x(Math.min(parse(d.Max), x.domain()[1])))  ; 
  focus.select(".axis--x").call(xAxis);
  svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
      .scale(width / (s[1] - s[0]))
      .translate(-s[0], 0));
}

function zoomed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
  var t = d3.event.transform;
  x.domain(t.rescaleX(x2).domain());
  focus.selectAll(".TIMELINE2")
  focus.select(".axis--x").call(xAxis);
  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}

function type(d) {
  d.date = parseDate(d.date);
  d.price = +d.price;
  return d;
}

function parse(str) {
  var y = str.substr(0,4),
      m = str.substr(4,2) - 1,
      d = str.substr(6,2);
  return new Date(y,m,d);
}


</script>

Answer 1

缺少一些东西：

axis--x class 被分配给实际的 x 轴 <g> 和所有行以及因此在刷牙中重新绘制轴不起作用。通过以下方式修复此问题：
```
.append("line")
.attr("class", "TIMELINE")
```
AND 在 brushed 函数中，
```
focus.select("g.axis--x").call(xAxis);
```
您正在 brushed 函数中设置新的 x 域。所以你只需像在初始阶段一样使用它来设置线条。
```
focus.selectAll(".TIMELINE")
   .attr("x1", d => x(parse(d.Min)))  
   .attr("x2", d => x(parse(d.Max)));
```
zoomed 函数中缺少上述行渲染。也添加了。

已将剪辑路径添加到 SVG，但从未使用过。添加它（到焦点和上下文行）。

.append("line")
.attr("class", "TIMELINE")
.style("stroke", "black")
.style("clip-path", "url(#clip)")

根据 y 轴带宽对齐线（通过更改 y1 和 y2 使它们居中对于焦点和上下文）：

.attr("x1", d => x(parse(d.Min)))
.attr("y1", d => y(d.SheetName) + y.bandwidth()/2)
.attr("x2", d => x(parse(d.Max)))
.attr("y2", d => y(d.SheetName) + y.bandwidth()/2)

经过上述更改，这里有一个工作片段：

const data={"summary": [
      {
      "SheetName":  "Line 1",
      "N" : "3922 ",
      "Min" : "19990508 ",
      "Max" : "20180905 ",
      "Range" : "19.34 "
      },
      {
      "SheetName":  "Line 2",
      "N" : "482 ",
      "Min" : "20080215 ",
      "Max" : "20180720 ",
      "Range" : "10.41 "
      },
      {
      "SheetName":  "Line 3",
      "N" : "77 ",
      "Min" : "20080917 ",
      "Max" : "20150514 ",
      "Range" : "6.66 "
      },
      {
      "SheetName":  "Line 4",
      "N" : "60 ",
      "Min" : "20090325 ",
      "Max" : "20171205 ",
      "Range" : "8.76 "
      }],
      "data" :[
      {
      "DMY" : "19990101 ",
      },
      {
      "DMY" : "20190101 ",
      }
]};

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 110, left: 180},
    margin2 = {top: +svg.attr("height")-80, right: margin.right, bottom: 30, left: margin.left},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    height2 = +svg.attr("height") - margin2.top - margin2.bottom;

var parseDate = d3.timeParse("%b %Y");

var x = d3.scaleTime().range([0, width]),
    x2 = d3.scaleTime().range([0, width]),
    y = d3.scaleBand().range([0, height]),
    y2 = d3.scaleBand().range([0, height2]);

var xAxis = d3.axisBottom(x),
    xAxis2 = d3.axisBottom(x2),
    yAxis = d3.axisLeft(y);

var brush = d3.brushX()
    .extent([[0, 0], [width, height2]])
    .on("brush end", brushed);

var zoom = d3.zoom()
    .scaleExtent([1, Infinity])
    .translateExtent([[0, 0], [width, height]])
    .extent([[0, 0], [width, height]])
    .on("zoom", zoomed);

svg.append("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

var focus = svg.append("g")
    .attr("class", "focus")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var context = svg.append("g")
    .attr("class", "context")
    .attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");

//------------------------------------;

  x.domain(d3.extent(data.data, d=> parse(d.DMY)));
  y.domain(data.summary.map(d => d.SheetName));
  x2.domain(x.domain());
  y2.domain(y.domain());

/*   focus.append("line")
       .datum(data.summary)
       .attr("class", "TIMELINE")
       .attr("stroke", "black"); */

  focus.selectAll(".TIMELINE")
                       .data(data.summary)
                       .enter()
                       .append("line")
                       .attr("class", "TIMELINE")
                       .style("stroke", "black")
                       .style("clip-path", "url(#clip)")                       
                       .attr("x1", d => x(parse(d.Min)))
                       .attr("y1", d => y(d.SheetName) + y.bandwidth()/2)
                       .attr("x2", d => x(parse(d.Max)))
                       .attr("y2", d => y(d.SheetName) + y.bandwidth()/2)      

  context.selectAll(".TIMELINE2")
                       .data(data.summary)
                       .enter()
                       .append("line")
                       .attr("class", "TIMELINE2 axis--x")
                       .style("stroke", "black")
                       .style("clip-path", "url(#clip)")                                              
                       .attr("x1", d => x(parse(d.Min)))
                       .attr("y1", d => y2(d.SheetName) + y2.bandwidth()/2)
                       .attr("x2", d => x(parse(d.Max)))
                       .attr("y2", d => y2(d.SheetName) + y2.bandwidth()/2)      

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

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

  context.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height2 + ")")
      .call(xAxis2);

  context.append("g")
      .attr("class", "brush")
      .call(brush)
      .call(brush.move, x.range());

  svg.append("rect")
      .attr("class", "zoom")
      .attr("width", width)
      .attr("height", height)
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    .call(zoom);

//-----------------------------------------;

function brushed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
  var s = d3.event.selection || x2.range();
  x.domain(s.map(x2.invert, x2));

  focus.selectAll(".TIMELINE")
       .attr("x1", d => x(parse(d.Min)))  
       .attr("x2", d => x(parse(d.Max)));
  focus.select("g.axis--x").call(xAxis);
  svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
      .scale(width / (s[1] - s[0]))
      .translate(-s[0], 0));
}

function zoomed() {
  if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
  var t = d3.event.transform;
  x.domain(t.rescaleX(x2).domain());

  focus.selectAll(".TIMELINE")
       .attr("x1", d => x(parse(d.Min)))  
       .attr("x2", d => x(parse(d.Max)));
  focus.select("g.axis--x").call(xAxis);
  context.select(".brush").call(brush.move, x.range().map(t.invertX, t));
}

function type(d) {
  d.date = parseDate(d.date);
  d.price = +d.price;
  return d;
}

function parse(str) {
  var y = str.substr(0,4),
      m = str.substr(4,2) - 1,
      d = str.substr(6,2);
  return new Date(y,m,d);
}

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}

.TIMELINE {
  stroke-width : 2px;
  stroke-opacity:0.5;
}

.TIMELINE2 {
  stroke-width : 0.5px;
  stroke-opacity:0.5;
}

<script src="https://d3js.org/d3.v4.min.js"></script>

<svg width="900" height="500"></svg>

和一个JSFIDDLE。希望这有帮助。

D3 画笔和缩放错误

D3 Brush and Zoom error

brush

zooming

stroke

d3.js