如何使用d3从json文件读取路径信息

Question

我正在从shapes json文件中读取形状信息，并使用d3对其进行可视化。

我有它为矩形工作。 我需要一些帮助来阅读路径信息。

如何阅读路径？ 我应该以其他方式组织json文件吗？

d3.json("shapes.json", function(json) {
  /* Define the data for the circles */
  var elem = svgContainer3.selectAll("g")
    .data(json.rooms)

  /*Create and place the "blocks" containing the rooms and the text */
  var elemEnter = elem.enter()
    .append("g")
    .attr("transform", function(d) {
      return "translate(0,0)"
    })

  /*Create the rooms for each block */
  var room = elemEnter.append("rect")
    .attr("width", function(d) {
      return d.w
    })
    .attr("height", function(d) {
      return d.h
    })
    .attr("x", function(d) {
      return d.x
    })
    .attr("y", function(d) {
      return d.y
    })
    .attr("stroke", "black")
    .attr("fill", "white")

  /* Create the text for each room */
  elemEnter.append("text")
    .attr("x", function(d){return d.x})
    .attr("y", function(d){return d.y})
    .attr("dx", function(d){return 15})
    .attr("dy", function(d){return 15})
    .text(function(d) {
      return d.label
    })

/// Read for Path

带有矩形和路径文件的JSON文件。

{"rooms":[
  {"w":50, "h":30, "x":125 , "y":240, "label":"200"}, 
  {"w":70, "h":30, "x":175 , "y":240, "label":"202"},
  {"w":30, "h":30, "x":245 , "y":240, "label":""},
  {"w":70, "h":30, "x":275 , "y":240,"label":"204"},
  {"w":50, "h":30, "x":345 , "y":240,"label":"206"}
],
"paths":[
    {"lineData":[
        {"x": 1,"y": 5},
        {"x": 20,"y": 5},
        {"x": 20,"y": 20},
        {"x": 1,"y": 20},
        {"x": 1,"y": 5}
    ], "label":"222"}, 
    {"lineData":[
        {"x": 20,"y": 5},
        {"x": 40,"y": 5},
        {"x": 40,"y": 20},
        {"x": 20,"y": 20},
        {"x": 1,"y": 5}
    ],"label":"220"}
]}

Answer 1

经过一些试验，我想我可能已经回答了我自己的问题。

   // create a selection to bind the data to
  var paths = svgContainer3.selectAll('paths')
    // bind the incoming data
    .data(json.paths)
   // for each incoming datapoint...
   .enter()
    // append a path element...
    .append('svg:path')
    // giving it a pathdata attribute corresponding to the current element in the data array
    .attr('d', function(d) { 
      d = lineFunctionStep(d.lineData)
      return d; })
    .attr("stroke", "blue")
    .attr("stroke-width", 2)
    .attr("fill", "none");