当由 series.columns.template.propertyFields.fill 设置时，图例不遵循系列的颜色，就像使用 series.fill 时一样

Posted 2023-02-16

【中文标题】当由 series.columns.template.propertyFields.fill 设置时，图例不遵循系列的颜色，就像使用 series.fill 时一样

【英文标题】：legend do not follow colors of series when it is set by series.columns.template.propertyFields.fill as when it is with series.fill

【发布时间】：2019-08-01 12:12:05

【问题描述】：

当由 series.columns.template.propertyFields.fill 设置时，Legend 不会像使用 series.fill 时那样遵循系列的颜色 该示例位于 https://jsfiddle.net/bosiljkakostic1/de16nbu7/4/ 当你取消注释时

//series1.fill = "red";
//series2.fill = "blue";
//series3.fill = "green";

例子效果很好，但如果颜色是由

series1.columns.template.propertyFields.fill = "color1";
series2.columns.template.propertyFields.fill = "color2";
series3.columns.template.propertyFields.fill = "color3";

图例颜色不遵循系列颜色 完整代码：

<script src="//www.amcharts.com/lib/4/core.js"></script>
<script src="//www.amcharts.com/lib/4/charts.js"></script>
<div id="chartdiv"></div>
<script>
/**
 * ---------------------------------------
 * This demo was created using amCharts 4.
 *
 * For more information visit:
 * https://www.amcharts.com/
 *
 * Documentation is available at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 * MODIFIED by Bosiljka Kosic, adding legend
 * and more series to describe the problem :
 * legend do not follow colors of series 
 * when it is set by  
 * series.columns.template.propertyFields.fill
 * as when it is with series.fill
 */

// Create chart instance
var chart = am4core.create("chartdiv", am4charts.XYChart);

// Add data
chart.data = [
  "category": "Research & Development",
  "value1": 450,
  "color1": "red",
  "value2": 1200,
  "color2": "blue",
  "value3": 1500,
  "color3": "green"
,

  "category": "Marketing",
  "value1": 700,
  "color1": "red",
  "value2": 1000,
  "color2": "blue",
  "value3": 1200,
  "color3": "green"
,

  "category": "Distribution",
  "value1": 600,
  "color1": "red",
  "value2": 400,
  "color2": "blue",
  "value3": 1100,
  "color3": "green"
              
             ];

// Create axes
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

// Create series
var series1 = chart.series.push(new am4charts.ColumnSeries());
series1.dataFields.valueY = "value1";
series1.dataFields.categoryX = "category";
series1.columns.template.propertyFields.fill = "color1";
var series2 = chart.series.push(new am4charts.ColumnSeries());
series2.dataFields.valueY = "value2";
series2.dataFields.categoryX = "category";
series2.columns.template.propertyFields.stroke = "color2";
var series3 = chart.series.push(new am4charts.ColumnSeries());
series3.dataFields.valueY = "value3";
series3.dataFields.categoryX = "category";
series3.columns.template.propertyFields.stroke= "color3";
series1.columns.template.propertyFields.stroke = "color1";
series2.columns.template.propertyFields.fill = "color2";
series3.columns.template.propertyFields.fill = "color3";
//series1.fill = "red";
//series2.fill = "blue";
//series3.fill = "green";
series1.name="2017";
series2.name="2018";
series3.name="2019";
chart.legend = new am4charts.Legend();
</script>
<style>
body 
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";

#chartdiv 
  width: 100%;
  height: 300px;

</style>

【参考方案1】：

图例标记从系列的填充中获取颜色。当您通过属性字段绑定填充系列的列时，将其注释掉。图例标记的dataItem.dataContext 是它们相关的系列本身，因此列的数据无关紧要，那些永远不会到达标记。即使列/它们的数据以某种方式相关，图表如何知道要选择哪一列来设置图例项的样式？

您可以做的是，每次列着色时，更新列系列的图例标记（或等到列被实例化，即 columns.template.once("datavalidated", ...) 而不是适配器，所以它只完成一次）。

为了customize the legend markers，我们需要将useDefaultMarker 设置为true。

chart.legend.markers.template.useDefaultMarker = true;

chart.series.each(function(series) 
    series.columns.template.adapter.add("fill", function(fill, target) 
        chart.legend.markers.each(function(marker) 
            if (marker.dataItem.dataContext === target.dataItem.component) 
                marker.children.getIndex(0).fill = fill;
            
        );
        return fill;
    );
);

你的代码的分支：

https://jsfiddle.net/notacouch/ot5uadez/

【讨论】：

您可以检查系列类型，例如 if(series.className === "ColumnSeries") else if (series.className === "LineSeries") 并像这样更改检查 LineSeries 事件： series .adapter.add("fill", function (fill, target)

@UmutBebek 啊，我明白了。在这种情况下，您可以将series.columns.template 替换为根据您提到的条件进行调整的变量。我还没有测试过这些，但这是让代码灵活/抽象的一种可能性。