[英]dc.js bar chart - calculate bar size by sum of multiple data entries
Sorry for the title, it is hard to sumarize what I am trying to achieve in one sentence.对不起,标题很难用一句话概括我想要实现的目标。
I have a bar chart that uses a crossfilter that is also used by 6 other charts.我有一个使用交叉过滤器的条形图,其他 6 个图表也使用该交叉过滤器。 My data looks as follows (note: this is only a small sample, there are more keys in each object)
我的数据如下(注意:这只是一个小样本,每个对象中有更多的键)
var data = [
{ clientime : '20210603000000', calendarweek : '22', x : 9, y : 4 },
{ clientime : '20210603000007', calendarweek : '22', x : 5, y : 5 },
{ clientime : '20210607000000', calendarweek : '23', x : 1, y : 2 },
{ clientime : '20210607000007', calendarweek : '23', x : 5, y : 5 },
{ clientime : '20210615000000', calendarweek : '24', x : 10, y : 20 },
{ clientime : '20210615000011', calendarweek : '24', x : 5, y : 5 },
];
The category for each bar is the calendarweek and I wan the the value to be the sum of all x devided by the sum of all y.每个条形的类别是日历周,我希望该值是所有 x 的总和除以所有 y 的总和。
According to the above sample I would like to see 3 bars.根据上面的示例,我想看到 3 个条形图。
Bar '22' should have the value `sum(9,5)/sum(4,5)` = 1.556
Bar '23' should have the value `sum(1,5)/sum(2,5)` = 0.857
Bar '24' should have the value `sum(10,5)/sum(20,5)` = 0.6
My first intention wasto use the reduce
function where I would add or remove the sums in a custom dictionary.我的第一个意图是使用
reduce
函数,在其中添加或删除自定义字典中的总和。
var x_key = "calendarweek";
var dim = crossfilter.dimension( d => d[x_key] );
var grp = dim.group().reduce(
( p, v ) => {
p.sum_x += v.x;
p.sum_y += v.y;
return p;
},
( p, v ) => {
p.sum_x -= v.x;
p.sum_y -= v.y;
return p;
},
() => ( { sum_x : 0, sum_y : 0 } )
);
var chart = dc.barChart( "#chart" );
chart
.width( 490 )
.height( 280 )
.dimension( dim )
.group( grp )
.x( d3.scaleBand() )
.xUnits( dc.units.ordinal )
.elasticX( true )
.elasticY( true )
.controlsUseVisibility( true )
.margins( {
top : 10, right : 50, bottom : 20, left : 40,
} );
grp.all()
does seem to look fine but from here on out I am not sure how to set the data correctly to chart. grp.all()
看起来确实不错,但从现在开始我不确定如何将数据正确设置为图表。 Using the created group no bars are shown at all because I creted an object in the reduce function that dc.js does not understand.使用创建的组根本没有显示任何条,因为我在 reduce 函数中创建了一个 dc.js 不理解的对象。
Additionally I would like to still be able to limit the bars to N entries.此外,我希望仍然能够将条形限制为 N 个条目。
Thanks to Gordon in the comments pointing me into the right direction I was able to solve my problem using the valueAccesor
.感谢 Gordon 在评论中指出我正确的方向,我能够使用
valueAccesor
解决我的问题。
chart_mttrhist.valueAccessor( function( d ) {
return ( d.value.sum_x / d.value.sum_y );
} );
Please note that the code in the question changed a little.请注意,问题中的代码略有变化。
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