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首页 > 解决方案 > amCharts4 - 如何在 Force Directed Tree 中的节点之间设置单个链接/边缘的样式？

javascript - amCharts4 - 如何在 Force Directed Tree 中的节点之间设置单个链接/边缘的样式？

问题描述

我正在使用 am4Charts 并且有一个带有几个节点的强制定向树。我想更改图表中单个链接的笔画宽度。

简单的例子：

<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>

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;

代码笔示例

在文档中，我找到了一种设置所有链接strokeWidth的方法。strokeOpacity

我已经尝试过制作第二个series并将“第三个”节点移至该节点并strokeWidth仅设置第二个系列，但节点未连接。即使它有效，这似乎是一种相当复杂的方式。

如何设置strokeWidth两个节点之间的单个链接，例如从节点“First”到节点“Third”并保持所有其他链接不变，最好不要将节点分成多个series？

标签： javascriptamcharts

解决方案

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
    }
}

您还可以添加适配器：

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

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

为节点赋予 id 属性。

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