amCharts4 - 如何在Force Directed Tree中節點之間設置單鏈路/邊緣的樣式？

Question

我正在使用am4Charts並且有一個帶有幾個節點的Force Directed Tree。 我想更改圖表中單個鏈接的筆觸寬度。

簡單的例子：

<script src="//www.amcharts.com/lib/4/core.js"></script>
<script src="//www.amcharts.com/lib/4/charts.js"></script>
<script src="//www.amcharts.com/lib/4/themes/animated.js"></script>
<script src="//www.amcharts.com/lib/4/plugins/forceDirected.js"></script>
<div id="chartdiv"></div>

使用Javascript：

am4core.useTheme(am4themes_animated);

// Create chart
chart = am4core.create("chartdiv", am4plugins_forceDirected.ForceDirectedTree);

// Create series
var series = chart.series.push(new am4plugins_forceDirected.ForceDirectedSeries());

// Set data
series.data = [{
  "name": "First",
  "link": ["Second", "Third"],
  "children": [{
    "name": "A1", "value": 100, "link": ["B2"]
  }, {
    "name": "A2", "value": 60
  }, {
    "name": "A3", "value": 30
  }]
}, {
  "name": "Second",
  "children": [{
    "name": "B1", "value": 135
  }, {
    "name": "B2", "value": 98
  }, {
    "name": "B3", "value": 56
  }]
}, {
  "name": "Third",
  "children": [{
    "name": "C1", "value": 1
  }]
}];
series.dataFields.linkWith = "link";
series.dataFields.id = "name";
// Set up data fields
series.dataFields.value = "value";
series.dataFields.name = "name";
series.dataFields.children = "children";

// Add labels
series.nodes.template.label.text = "{name}";
series.fontSize = 10;
series.minRadius = 15;
series.maxRadius = 40;
// series.centerStrength = 50;
// series.manyBodyStrength = 50;
series.links.template.strokeWidth = 5;
series.links.template.strokeOpacity = 1;

series.centerStrength = 0.5;

Codepen示例

在文檔中，我找到了為所有鏈接設置strokeWidth和strokeOpacity的方法。

我已經嘗試制作第二個series並將“第三”節點移動到該節點並僅為第二個系列設置strokeWidth ，但節點未連接。 即使它起作用，這似乎是一種相當復雜的方式。

如何設置兩個節點之間單個鏈接的strokeWidth ，例如從節點“First”到節點“Third”並保持所有其他鏈接不變，最好不將節點分成多個series ？

Answer 1

series.links.template.configField = 'configLink'; //maps configLink property of data nodes to the links

接着

{
    "name": "Second",
    "children": [{
    "name": "B1", "value": 135
    }, {
    "name": "B2", "value": 98
    }, {
    "name": "B3", "value": 56
    }],
    configLink: {
        fill: color,
        stroke: color,
        strokeWidth: 2
    }
}

您還可以添加適配器：

series.links.template.adapter.add('stroke', (stroke, target) => {
        if (target.dataItem.id === 'somenodesID') {
            return am4core.color();
        }

        return am4core.color('#ddd');
    });

為節點提供id屬性。