D3 - 确保条宽的大小一致

时间:2017-09-08 23:16:25

标签: css d3.js svg

我是D3新手,并通过条形图示例。我想要确保条和标签的高度是一致的。现在它取决于回来的条目数量。所以,如果有1,那就有一个巨大的斑点。如果有10则则条形较慢。这是代码和链接。

https://plnkr.co/edit/CZEyIaOxItoWZXSQkqjH?p=preview

的index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  margin: 15px;
  background-color: #F1F3F3    
}
.bar {
    fill: #6F257F;
}
.axis path,
.axis line {
  fill: none;
  stroke: #D4D8DA;
  stroke-width: 1px;
  shape-rendering: crispEdges;
}
.x path {
    display: none;
}
.toolTip {
    position: absolute;
  display: none;
  min-width: 80px;
  height: auto;
  background: none repeat scroll 0 0 #ffffff;
  border: 1px solid #6F257F;
  padding: 14px;
  text-align: center;
}
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 80},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;

var tooltip = d3.select("body").append("div").attr("class", "toolTip");

var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleBand().range([height, 0]);

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

d3.json("data.json", function(error, data) {
    if (error) throw error;

    data.sort(function(a, b) { return a.value - b.value; });

    x.domain([0, d3.max(data, function(d) { return d.value; })]);
    y.domain(data.map(function(d) { return d.area; })).padding(0.1);

    g.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x).ticks(5).tickFormat(function(d) { return parseInt(d / 1000); }).tickSizeInner([-height]));

    g.append("g")
        .attr("class", "y axis")
        .call(d3.axisLeft(y));

    g.selectAll(".bar")
        .data(data)
      .enter().append("rect")
        .attr("class", "bar")
        .attr("x", 0)
        .attr("height", y.bandwidth())
        .attr("y", function(d) { return y(d.area); })
        .attr("width", function(d) { return x(d.value); })
        .on("mousemove", function(d){
            tooltip
              .style("left", d3.event.pageX - 50 + "px")
              .style("top", d3.event.pageY - 70 + "px")
              .style("display", "inline-block")
              .html((d.area) + "<br>" + "£" + (d.value));
        })
            .on("mouseout", function(d){ tooltip.style("display", "none");});
});
</script>

data.json

[
    {"area": "central ", "value": 18000},
    {"area": "Riverside ", "value": 17000},
    {"area": "Picton ", "value": 80000},
    {"area": "Everton ", "value": 55000},
    {"area": "Kensington ", "value": 100000},
    {"area": "Kirkdale", "value": 50000},
     {"area": "Evertons ", "value": 5000},
    {"area": "Kensingtons ", "value": 100000},
     {"area": "Everton ", "value": 55000},
    {"area": "Kensington ", "value": 100000},
    {"area": "Kirkdale", "value": 50000}


]

谢谢!

1 个答案:

答案 0 :(得分:2)

如果我正确理解您的问题,您需要确保每个条形图总是具有相同的高度(以像素为单位),无论条形数量如何。

如果这是正确的,请动态设置范围。例如:

var barSize = 40;
y.range([barSize*data.length, 0]);

以下是包含完整数据数组的plunker:https://plnkr.co/edit/zNOMcQob6fSFkEYclyzS?p=preview

现在,为了比较,只有三个数据元素的相同代码:https://plnkr.co/edit/KciR2eheLLIOS1SHUM7i?p=preview

PS:您有area属性的重复名称。这并不适用于有序规模。

PPS:一个好主意是根据数据长度设置SVG高度。