Template:Graph:Population history

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<graph> { 

 //
 // ATTENTION: This code is maintained at https://www.mediawiki.org/wiki/Template:Graph:Population_history
 //            Please do not modify it anywhere else, as it may get copied and override your changes.
 //            Suggestions can be made at https://www.mediawiki.org/wiki/Template_talk:Graph:Population_history
 //

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

 // The population data could be from Commons dataset, Wikidata, or hardcoded values
 "data": [
   {
     "name": "table",

"url": "wikidatasparql:///?query=SELECT%20%28MAX%28%3Fpopulation_entry%29%20as%20%3Fpopulation%29%20%3Fyear%20WHERE%20%7B%0A%20%20%20%20%23%20set%20the%20item%20here%20-%20e.g.%20city%2C%20country%0A%09BIND%28wd%3AQ84%20as%20%3Fitem%29%0A%20%20%20%20%3Fitem%20p%3AP1082%20%3Fpopstatement%20.%0A%20%20%20%20%3Fpopstatement%20ps%3AP1082%20%3Fpopulation_entry%20.%0A%20%20%20%20OPTIONAL%20%7B%0A%20%20%20%20%20%20%3Fpopstatement%20pq%3AP585%20%3Fdate%20.%0A%20%20%20%20%20%20BIND%28year%28%3Fdate%29%20as%20%3Fyear%29%0A%20%20%20%20%7D%0A%7D%20GROUP%20BY%20%3Fyear%20ORDER%20BY%20ASC%28%3Fyear%29", 

     "format": { "type": "json" },
     // Convert year integer (2016) into a date object (2016-01-01)
     "transform": [
     	// Optionally filter data with an template expression parameter
     	// e.g.  filter = datum.year > 1900 && datum.year < 2000

     	{ "type": "formula", "field": "date", "expr": "datetime(datum.year,0,1)" }
     ]
   },

   // Each annotation is expected to be an integer year, string text,
   // and optional string color (e.g. "#4d2800")
   {
     "name": "annotations",

"values": [], 

     "transform": [
       { "type": "formula", "field": "date", "expr": "datetime(datum.year,0,1)" },
       { "type": "formula", "field": "color", "expr": "datum.color||'#000'" }
     ]
   }
 ],

 "scales": [
   // The dates are scaled to the "x" axis - the width of the graph
   {
     "name": "x",
     "type": "time",
     "range": "width",
     "domain": {"data": "table","field": "date"}
   },
   // The population 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": "table","field": "population"},
     "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, "orient":"right"}
 ],

 // The graph is drawn with two elements a thick line at the top,
 // and a semi-transparent area below
 "marks": [
   {
     "type": "area",
     "from": {"data": "table"},
     "properties": {
       "enter": {
         "x": {"scale": "x", "field": "date"},
         "y": {"scale": "y", "value": 0},
         "y2": {"scale": "y", "field": "population"},
         "fill": {"value": "#99B2CC"},
         "fillOpacity": {"value": 0.35},
         "interpolate": {"value": "monotone"}
       }
     }
   },
   // If annotations are given, draw dashed line with associated text
   {
     "type": "rule",
     "from": {"data": "annotations"},
     "properties": {
       "enter": {
         "x": {"scale": "x", "field":"date"},
         "y": {"value": 0},
         "y2": {"signal": "height"},
         "stroke": {"field": "color"},
         "strokeWidth": {"value": 2},
         "opacity": {"value": 0.6},
         "strokeDash": {"value": [8,3]}
       }
     }
   },
   {
     "type": "line",
     "from": {"data": "table"},
     "properties": {
       "enter": {
         "x": {"scale": "x","field": "date"},
         "y": {"scale": "y","field": "population"},
         "stroke": {"value": "#99B2CC"},
         "strokeWidth": {"value": 3},
         "interpolate": {"value": "monotone"}
       }
     }
   },
   // The small white circles should be drawn after annotations but before text
   {
     "type": "symbol",
     "from": {"data": "table"},
     "properties": {
       "enter": {
         "x": {"scale": "x","field": "date"},
         "y": {"scale": "y","field": "population"},
         "stroke": {"value": "#99B2CC"},
         "fill": {"value": "#fff"},
         "size": {"value": 30}
       }
     }
   },
   // Annotation text
   {
     "type": "text",
     "from": {"data": "annotations"},
     "properties": {
       "enter": {
         "x": {"scale": "x", "field":"date"},
         "y": {"value": 0},
         "align": {"value": "right"},
         "baseline": {"value": "bottom"},
         "angle": {"value": 270},
         "dx": {"value": -4},
         "dy": {"value": -2},
         "text": {"field": "text"},
         "stroke": {"field": "color"}
       }
     }
   }

 ]

}

</graph>

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