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Wikipedia:Wikipedia Signpost/Templates/PageViews graph

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<graph>

{
  //
  // Note: The graph uses PageViews API https://wikitech.wikimedia.org/wiki/Analytics/PageviewAPI
  //

  "version": 2,
  "width": 400,
  "height": 200,

  // The data for this graph comes from the PageView API.  The request is made for N days after publication date.
  "data": [
    {
      "name": "pageviews",
      "url": "wikirest://wikimedia.org/api/rest_v1/metrics/pageviews/per-article/en.wikipedia.org/all-access/user/Wikipedia%3AWikipedia%20Signpost%2FTemplates%2FPageViews%20graph/daily/<strong class="error">Error: Invalid time.[[Category:Pages with parser function time errors]]</strong>00/<strong class="error">Error: Invalid time.[[Category:Pages with parser function time errors]]</strong>00",
      "format": {
        "type": "json",
        "property": "items"
      },

      // The response is parsed here, converting date strings of form "20160223" into date 2016-02-23
      "transform": [
        { "type": "formula", "field": "year", "expr": "parseInt(substring(datum.timestamp,0,4))" },
        { "type": "formula", "field": "month", "expr": "parseInt(substring(datum.timestamp,4,6))" },
        { "type": "formula", "field": "day", "expr": "parseInt(substring(datum.timestamp,6,8))" },
        { "type": "formula", "field": "date", "expr": "datetime(datum.year,datum.month-1,datum.day)" }
      ]
    }
  ],

  "scales": [
    // The dates are scaled to the "x" axis - the width of the graph
    {
      "name": "x",
      "type": "time",
      "range": "width",
      "domain": {"data": "pageviews","field": "date"}
    },
    // The pageviews are scaled to the "y" axis - the height of the graph
    // Optional scale parameter can change "linear" to other scales like log
    // Optional max parameter can fix the upper bound of the graph
    {
      "name": "y",
      "type": "linear",
      "range": "height",
      "domain": {"data": "pageviews","field": "views"},
      "clamp": true,

      "nice": true
    }
  ],

  // Simple axis with horizontal grid lines
  "axes": [
    {"type": "x", "scale": "x", "ticks": 5},
    {"type": "y", "scale": "y", "ticks": 5, "grid": true}
  ],

  // The graph is drawn with two elements a thick line at the top, and a semi-transparent area below
  "marks": [
    {
      "type": "line",
      "from": {"data": "pageviews"},
      "properties": {
        "enter": {
          "x": {"scale": "x","field": "date"},
          "y": {"scale": "y","field": "views"},
          "stroke": {"value": "#00f"},
          "strokeWidth": {"value": 3},
          "interpolate": {"value": "monotone"}
        }
      }
    },
    {
      "type": "area",
      "from": {"data": "pageviews"},
      "properties": {
        "enter": {
          "x": {"scale": "x","field": "date"},
          "y": {"scale": "y","value": 0},
          "y2": {"scale": "y","field": "views"},
          "fill": {"value": "#00f"},
          "fillOpacity": {"value": 0.35},
          "interpolate": {"value": "monotone"}
        }
      }
    }
  ]
}

</graph>
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