Crossfilter示例中的合成图 [英] Composite Graph from Crossfilter Example
问题描述
从付款示例交叉过滤器开始( https://github.com/square/crossfilter / wiki / API参考)如何为每种付款方式(标签,签证,现金)创建一个折线图的复合图?
Starting from the payments example crossfilter (https://github.com/square/crossfilter/wiki/API-Reference) how may we create a Composite Chart with one Line Chart for each payment type (tab, visa, cash)?
推荐答案
我假设您要显示一段时间内的付款总计
(日期
维度)的每个付款类型
。
I am assuming you want to display payment totals
over time (the date
dimension) for each payment type
.
var payments = crossfilter([...]);
var dateDimension = payments.dimension(function(d) { return new Date(d.date); });
为每种付款方式(标签,签证,现金)创建一组付款总计
Create a group of payment totals for each payment type (tab, visa, cash)
var totalForType = function(type) {
return function(d) {
return d.type === type ? d.total : null;
};
};
var tabTotalsGroup = dateDimension.group().reduceSum(totalForType('tab'));
var visaTotalsGroup = dateDimension.group().reduceSum(totalForType('visa'));
var cashTotalsGroup = dateDimension.group().reduceSum(totalForType('cash'));
定义组合图,并使用组定义3条折线图作为组合图的一部分。 / p>
Define a composite chart and use the groups to define 3 line charts as part of the composite chart.
var compositeChart = dc.compositeChart('#composite-chart');
compositeChart
...
.x(d3.time.scale().domain([new Date("2011-11-14T16:15:00Z"), new Date("2011-11-14T17:45:00Z")]))
.dimension(dateDimension)
.compose([
dc.lineChart(compositeChart).group(tabTotalsGroup, 'tab').colors(['#ffaa00']),
dc.lineChart(compositeChart).group(visaTotalsGroup, 'visa').colors(['#aa00ff']),
dc.lineChart(compositeChart).group(cashTotalsGroup, 'cash').colors(['#00aaff'])
]);
dc.renderAll();
完整示例: http://plnkr.co/edit/rhDURrDfeSvVqEnQR9L1?p=preview
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