如何用D3.js创建一个圆组一个组织圆图像并用曲线连接？

Question

我正在尝试使用 d3.js 创建一个径向（圆形）分组圆，类似于：

我写了一些如下代码。

但我不知道如何将每个圆圈与曲线连接起来，当鼠标悬停圆圈时，上面的圆圈会显示一个工具提示，怎么做？帮助将不胜感激。谢谢。

我更新了我的代码，现在我可以在大圆圈中画圆或图像元素了。

    const mockedData = {
    "nodes": [
      {
        "name": "Node1one",
        "label": "Node1",
        "id": 1,
        "x": 120,
        "y": 120,
      },
      {
        "name": "Node2",
        "label": "Node2",
        "id": 2,
        "x": 350,
        "y": 180,
      },
    ]
  }

  const imgList = {
    "images": [
      {
        "image": 'https://via.placeholder.com/30x30',
        "x": -50,
      },
      {
        "image": 'https://via.placeholder.com/30',
        "x": 20
      }
    ]
  }


const svg = d3.select("svg");
const width = +svg.attr("width");
const height = +svg.attr("height");

let { links, nodes } = mockedData;

let { images } = imgList;

const ticked = ( node) => {
  node.attr("transform", 
  function (d) {return "translate(" + d.x + ", " + d.y + ")";});
}

const tickedImg = (nodeImg) => {
  nodeImg.attr("x", function (d) {return  d.x })
}

const node = svg.selectAll(".node")
        .data(nodes)
        .enter()
        .append("g")
        .attr("class", "node")

    node.append('circle').attr("r", 86); //radius
    svg.selectAll('circle')
    .on('click', function () { // arrow function will produce this = undefined
       d3.selectAll('circle')
       .style("fill", "lightgray");
       d3.select(this)
        .style("fill", "aliceblue");
     })
     .on('mouseover', function () {
        d3.selectAll('circle')
        .style("stroke", "black");
        
        d3.select(this)
        .style("stroke", "green");
    })
    ticked( node )




const nodeText = node.append("text")
.attr("y", -70);

      nodeText.selectAll("tspan.text")
      .data((d) =>  d.name.split(" "))
      .enter()
      .append("tspan")
      .attr("class", "text")
      .text(d => d)
      .attr("x", -30)
      .attr("y", -60)

      node.append("title")
          .text(function (d) {return d.id;});

const nodeImg = node.selectAll("image")
        .data(images)
        .enter()
        .append("image")
        .attr("xlink:href", (d) => d.image)
        .attr("width", 27)
        .attr("height", 30)
        tickedImg (nodeImg)

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<svg width="100%" viewbox="0 0 2000 1000"></svg>

Answer 1

好的，如果我们只想在图像之间绘制弧线，我当然可以提供帮助：)

我在这里（非常详细地）回答了一个类似的问题：https://stackoverflow.com/a/59784798/9792594 - 这应该有助于解释数学等。

我将只使用该答案中的最终功能，如果您需要有关其工作原理的背景知识，请查看该答案。

注意：您可以通过更改“绘制顺序”来更改 svg 元素的“z 顺序”，即在 DOM 中呈现它们的顺序。所以在d3中，使用.append()，意思就是先在底层调用你想要的代码，然后在下一层调用你想要的代码，以此类推。

const mockedData = {
    "nodes": [
      {
        "name": "Node1",
        "label": "Node1",
        "id": 1,
        "x": 120,
        "y": 120,
      },
      {
        "name": "Node2",
        "label": "Node2",
        "id": 2,
        "x": 350,
        "y": 180,
      },
    ]
  }

  const imgList = {
    "images": [
      {
        "image": 'https://via.placeholder.com/30x30',
        "width": 30,
        "height": 30,
        "x": -50,
        "y": -20
      },
      {
        "image": 'https://via.placeholder.com/30',
        "width": 30,
        "height": 30,
        "x": 20,
        "y": -20
      },
      {
        "image": 'https://via.placeholder.com/30',
        "width": 30,
        "height": 30,
        "x": -15,
        "y": 20
      }
    ]
  }


const svg = d3.select("svg");
const width = +svg.attr("width");
const height = +svg.attr("height");

let { links, nodes } = mockedData;

let { images } = imgList;

const ticked = ( node) => {
  node.attr("transform", 
  function (d) {return "translate(" + d.x + ", " + d.y + ")";});
}

const tickedImg = (nodeImg) => {
  nodeImg.attr("x", function (d) {return  d.x })
}

const node = svg.selectAll(".node")
        .data(nodes);
        
    node
        .enter()
        .append("path")
        .attr("d", (d,i) => {
          //console.log(d,i,images)
          if (nodes.length > 1){
            const j = i == (nodes.length - 1) ? 0 : i + 1;
            const invertArc = (i+1) < (nodes.length/2);
            const gtr2 = nodes.length > 2 ? invertArc : !invertArc;
            //console.log(i,invertArc)
            return pointsToPath(d, nodes[j], gtr2);
          }
          return "";
        })
        .attr("stroke", "black")
        .attr("stroke-dasharray", "4")
        .attr("fill", "transparent");
        
const nodeGroup = node        
        .enter()
        .append("g")
        .attr("class", "node");
        
const circle = nodeGroup.append('circle').attr("r", 86); //radius
circle
    .style("fill", "darkgray")
    .on('click', function () { // arrow function will produce this = undefined
       d3.selectAll('circle')
       .style("fill", "darkgray");
       d3.select(this)
        .style("fill", "aliceblue");
     })
     .on('mouseover', function () {
        d3.selectAll('circle')
        .style("stroke", "black");

        d3.select(this)
        .style("stroke", "green");
    })
    ticked( nodeGroup );

const nodeText = nodeGroup.append("text")
      .attr("y", -70);

nodeText.selectAll("tspan.text")
      .data((d) =>  d.name.split(" "))
      .enter()
      .append("tspan")
      .attr("class", "text")
      .text(d => d)
      .attr("fill", "black")
      .attr("x", -30)
      .attr("y", -60)

nodeGroup.append("title")
      .text(function (d) {return d.id;});

const nodeImg = nodeGroup.selectAll("image")
      .data(images);
nodeImg      
      .enter()
      .append("image")
      .attr("xlink:href", d => d.image)
      .attr("width", d => d.width)
      .attr("height", d => d.height)
      .attr("x", d => d.x)
      .attr("y", d => d.y)
      //tickedImg (nodeImg)
      
      
nodeImg      
      .enter()
      .append("path")
      .attr("d", (d,i) => {
        //console.log(d,i,images)
        if (images.length > 1){
          const j = i == (images.length - 1) ? 0 : i + 1;
          const invertArc = (i+1) < (images.length/2);
          //console.log(i,invertArc)
          return pointsToPath(d, images[j], invertArc);
        }
        return "";
      })
      .attr("stroke", "black")
      .attr("stroke-dasharray", "4")
      .attr("fill", "transparent")
      .attr("transform", d => "translate(" + d.width/2 + ", " + d.height/2 + ")");
      //tickedImg (nodeImg)      
   
      
function pointsToPath(from, to, invertArc) {
  const centerPoint = [ (from.x + to.x) / 2, (from.y + to.y) / 2];
  const slope = (to.y - from.y) / (to.x - from.x);
  const invSlope = -1 / slope;
  const distance = Math.sqrt( Math.pow((to.x - from.x), 2) + Math.pow((to.y - from.y), 2) );
  const offset = (invertArc ? -1 : 1) * 2 * Math.sqrt(distance);

  const angle = Math.atan(slope);
  const offsetY = Math.cos(angle)*offset;
  const offsetX = Math.sin(angle)*offset;
  const offsetCenter = [centerPoint[0] - offsetX, centerPoint[1] + offsetY];
  const arcPointX = offsetCenter[0]
  const arcPointY = offsetCenter[1]   
  return 'M' + from.x + ' ' + from.y + 'Q' + arcPointX + ' ' + arcPointY +
          ' ' + to.x + ' ' + to.y;
 }

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<svg width="100%" viewbox="0 0 1000 500">
  <path d="M20 20 50 50" fill="transparent" stroke-width="5" stroke="black"></path>
</svg>

<script>
//the following d3 code would insert the same path as that manually inserted in the HTML above:
d3.select("svg")
  .append("path")
  //we can set it directly as below, or via a function:
  .attr("d", "M20 20 50 50")
  .attr("fill", "transparent")
  .attr("stroke-width", "5")
  .attr("stroke", "black");
</script>

输出（20 年 6 月 18 日更新）：