D3.js 折线图

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最近接了个第一财经的项目,大概是基于各种图表的数据呈现,但是要求是需要svg导出的功能。

echart

echart虽然支持svg渲染但是导出svg还有诸多bug，并且这个功能也没有写进文档。看来也是功能还没完善的原因

highChart

highChart svg导出功能完善 但是缺点是要钱。不考虑

d3.js

d3是一个数据驱动的可视化插件,简单理解就是操纵svg的jquery，优点是高度自定义，缺点是上手成本高。不过没办法，只能用这个了。

实践

经过简单的学习 从最简单的折线图开始

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>d3折线图</title>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
    <script src="http://d3js.org/d3.v5.min.js" charset="utf-8"></script>
    <style>

        body {
            font: 10px sans-serif;
            margin: 50px;
        }

        .grid .tick {
            stroke: lightgrey;
            opacity: 0.7;
            shape-rendering: crispEdges;
        }

        .grid path {
            stroke-width: 0;
        }

        .axis path {
            fill: none;
            stroke: #bbb;
            shape-rendering: crispEdges;
        }

        .axis text {
            fill: #555;
        }

        .axis line {
            stroke: #e7e7e7;
            shape-rendering: crispEdges;
        }

        .axis .axis-label {
            font-size: 14px;
        }

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

        .dot {
            /* consider the stroke-with the mouse detect radius? */
            stroke: transparent;
            stroke-width: 10px;
            cursor: pointer;
        }
        .tips-border{
          fill:rgba(0,0,0,0.6);
          stroke: gray;        
          stroke-width: 2;

        }
        .dot:hover {
            stroke: rgba(68, 127, 255, 0.3);
        }
    </style>
</head>
<body>
<div id="trendSvg"></div>
</body>
<script type="text/javascript">
    var data =  [
        [{'x':1,'y':0},{'x':2,'y':5},{'x':3,'y':10},{'x':4,'y':0},{'x':5,'y':6},{'x':6,'y':11},{'x':7,'y':9},{'x':8,'y':4},{'x':9,'y':11},{'x':10,'y':2}],
        [{'x':1,'y':1},{'x':2,'y':6},{'x':3,'y':11},{'x':4,'y':1},{'x':5,'y':7},{'x':6,'y':12},{'x':7,'y':8},{'x':8,'y':3},{'x':9,'y':13},{'x':10,'y':3}],
    ];
    var colors = [
        'steelblue',
        'green',
        'red',
        'purple'
    ];

    var margin = {top: 20, right: 30, bottom: 30, left: 50},
            width = 960 - margin.left - margin.right,
            height = 500 - margin.top - margin.bottom;

    var x = d3.scaleLinear()
            .domain([0, 12])
            .range([0, width]);

    var y = d3.scaleLinear()
            .domain([-1, 16])
            .range([height, 0]);

    //x轴设置
    var xAxis = d3.axisBottom(x)

    //y轴设置
    var yAxis = d3.axisLeft(y)



    var svg = d3.select("#trendSvg").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 + ")");

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

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

    svg.append("g")
            .attr("class", "y axis")
            .append("text")
            .attr("class", "axis-label")
            .attr("x", -margin.left+30)
            .attr("y", -margin.top+10)
            .text('y轴');


    var line = d3.line()
            .x(function(d) { return x(d.x); })
            .y(function(d) { return y(d.y); })
            .curve(d3.curveMonotoneX)

    svg.selectAll('.line')
            .data(data)
            .enter()
            .append("path")
            .attr("class", "line")
            .attr("d", line)
            .style("stroke-dasharray", function(d, i) {
               var length = d3.select(this).node().getTotalLength()
               return length+","+length
            })
            .attr('stroke', function(d,i){
                return colors[i%colors.length];
            })
            .transition()
            .duration(1500)
            .styleTween("stroke-dashoffset", function(d,i) {
                  var length = d3.select(this).node().getTotalLength()
                 return d3.interpolateNumber(length, 0);
             });
            


        var tips =  svg.append('g').attr('class', 'tips')
                    .attr('style', 'display:none')
                    .append('rect')
                    .attr('class', 'tips-border')
                    .attr('width', 200)
                    .attr('height', 50)
          var wording1 = tips.append('text')
            .attr('class', 'tips-text')
            .attr('x', 10)
            .attr('y', 20)
            .text('');

          var wording2 = tips.append('text')
            .attr('class', 'tips-text')
            .attr('x', 10)
            .attr('y', 40)
            .text('');
      var points = svg.selectAll('.dots')
              .data(data)
              .enter()
              .append("g")
              .attr("class", "dots");


     points.selectAll('.dot')
            .data(function(d, index){
                var a = [];
                d.forEach(function(point,i){
                    a.push({'index': index, 'point': point});
                });
                return a;
            })
            .enter()
            .append('circle')
            .attr('class','dot')
            .attr("r", 2)
            .attr('fill', function(d,i){
                return colors[d.index%colors.length];
            })
            .attr("transform", function(d) {
                return "translate(" + x(d.point.x) + "," + y(d.point.y) + ")"; }
            )
            .on('mousemove', function(d) {
              d3.select('.tips')
              .attr('transform', "translate(" + (x(d.point.x)-100) + "," + (y(d.point.y)-60) + ")")
              .style('display', 'block')
              .append('text')
              .attr('fill','white')
              .attr('class', 'tips-text')
              .attr('x', 10)
              .attr('y', 20)
              .text('哈哈哈哈');
               d3.select('.tips').append('text')
              .attr('fill','white')
              .attr('class', 'tips-text')
              .attr('x', 10)
              .attr('y', 40)
              .text('嘻嘻嘻嘻')
            })
            .on('mouseout', function() {
              d3.select('.tips').style('display', 'none');
            });
</script>
</html>

效果图：

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