问题描述
对象(/signalData.json):
"1": 10,"2": 20,"3": 30,"4": 40,"5": 50,"6": 60
键应为x坐标,值应为y坐标
我尝试了类似的方法,但是它不起作用:
var data = {
"1": 10,"6": 60
};
var dataModel = [{
"keys": Object.keys(data).map(function(d) {
return +d;
}),"values": Object.values(data)
},]
signalCF = crossfilter(dataModel)
signalDim = signalCF.dimension(function(d) {
return d.keys
},true)
signalGroup = signalDim.group().reduceSum(function(d) {
return d.values
});
var linechart = dc.lineChart("#linechart")
.width(700)
.height(300)
.x(d3.scale.linear().domain([0,6]))
.renderArea(true)
.brushOn(false)
.renderDataPoints(true)
.clipPadding(10)
.yAxisLabel("This is the Y Axis!")
.dimension(signalDim)
.group(signalGroup);
linechart.render();
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crossfilter2/1.4.0-alpha.6/crossfilter.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dc/2.1.1/dc.js"></script>
<div id="linechart"></div>
解决方法
您对数据结构做出了错误的假设。您需要一个每个刻度具有一个值的数组,而不是一个紧接所有值的数组:
[{ keys: [],values: [] }]
成为
[{ key: number,value: number },{ key: number,...]
var data = {
"1": 10,"2": 20,"3": 30,"4": 40,"5": 50,"6": 60
};
var dataModel = Object.keys(data).map(function(d) {
return {
key: +d,value: data[d]
};
})
signalCF = crossfilter(dataModel)
signalDim = signalCF.dimension(dc.pluck("key"))
signalGroup = signalDim.group().reduceSum(function(d) {
return d.value;
});
var linechart = dc.lineChart("#linechart")
.width(700)
.height(300)
.x(d3.scale.linear().domain([0,6]))
.renderArea(true)
.brushOn(false)
.renderDataPoints(true)
.clipPadding(10)
.yAxisLabel("This is the Y Axis!")
.dimension(signalDim)
.group(signalGroup);
linechart.render();
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crossfilter2/1.4.0-alpha.6/crossfilter.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dc/2.1.1/dc.js"></script>
<div id="linechart"></div>