Extension:Graph/Interactive Graph Tutorial 2/fr

Dans ce tutoriel, nous allons créer un graphe interactif qui affichera les taux de fertilité historiques par pays, avec un curseur pour sélectionner l'année, et une carte pour montrer la distribution des taux partout sur la planète. Le code source de ce graphe est ici. Vous pourriez également être intéressés par la documentation complète de Vega (en anglais).

Dans ce tutoriel, nous poursuivons la première partie de ce tutoriel.



Dessiner une carte avec quelques données utiles
Now that we built the slider in part 1 of this tutorial, we can add a map and mix it with the highlighting data. We need two sources of data - the map in TopoJSON format is stored in wiki markup here, and the fertility data that is stored as a CSV text in wiki markup, copied from WorldBank (license)

Each country is tagged with a ISO-3 country code. The CSV data contains "country", "id" columns, as well as years 1960..2013, each as a separate column.

 { "version": 2, "width": 500, "height": 260, "padding": 12, "background": "#edf1f7", "signals": [ {     "name": "isDragging", "init": false, "streams": [ {"type": "@handle:mousedown","expr": "true"}, {"type": "mouseup","expr": "false"} ]   },    {      "name": "scaledHandlePosition", "streams": [ {         "type": "mousemove[isDragging]", "expr": "eventX", "scale": {"name": "yearsScale","invert": true} }     ]    },    {      "name": "currentYear", "init": 2000, "expr": "clamp(parseInt(scaledHandlePosition),1960,2013)" } ],  "data": [ {     "name": "highlights", "url": "wikiraw:///Extension:Graph/Demo/RawData:FertilityByCountryHistoric-csv", "format": {"type": "csv"}, "transform": [ {         "type": "formula", "field": "v", "expr": "parseFloat(datum[''+currentYear])" }     ]    },    {      "name": "countries", "url": "wikiraw:///Extension:Graph/Demo/RawData:WorldMap-iso3-json", "format": {"type": "topojson","feature": "countries"}, "transform": [ {         "type": "geopath", "value": "data", "scale": 80, "center": [-180,125], "translate": [0,0], "projection": "equirectangular" },       {          "type": "lookup", "keys": ["id"], "on": "highlights", "onKey": "id", "as": ["zipped"], "default": {"v": null, "country":"No data"} }     ]    }  ],  "scales": [ {     "name": "yearsScale", "type": "linear", "zero": false, "domain": [1960,2013], "range": "width" },   {      "name": "color", "type": "linear", "domain": {"data": "countries","field": "zipped.v"}, "domainMin": 1, "zero": false, "range": ["#FFEDBC", "#f83600"] } ],  "marks": [ {     "name": "yearLabel", "type": "text", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 25}, "fontSize": {"value": 32}, "fontWeight": {"value": "bold"}, "fill": {"value": "steelblue"} },       "update": {"text": {"signal": "currentYear"}} }   },    {      "name": "scrollLine", "type": "rule", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 40}, "x2": {"value": 500}, "stroke": {"value": "#000"}, "strokeWidth": {"value": 2} }     }    },    {      "name": "handle", "type": "path", "properties": { "enter": { "y": {"value": 40}, "path": {"value": "m-5.5,-10l0,20l11.5,-10l-11.5,-10z"}, "stroke": {"value": "#880"}, "strokeWidth": {"value": 2.5} },       "update": { "x": {"scale": "yearsScale","signal": "currentYear"}, "fill": {"value": "#fff"} },       "hover": {"fill": {"value": "#f00"}} }   },    {      "name": "map", "type": "path", "from": {"data": "countries"}, "properties": { "enter": {"path": {"field": "layout_path"}}, "update": { "fill": [ {             "test": "datum.zipped.v !== null", "scale": "color", "field": "zipped.v"           }, {"value": "grey"} ]       },        "hover": {"fill": {"value": "#989898"}} }   }  ] }



Ajouter une légende
Graph fournira plus d'informations si l'utilisateur connait la correspondance des couleurs avec les chiffres. Malheureusement le placement de la légende demande encore à être amélioré dans Vega, mais il semble satisfaisant pour les graphiques non basés sur des cartes.

 { "version": 2, "width": 500, "height": 260, "padding": 12, "background": "#edf1f7", "signals": [ {     "name": "isDragging", "init": false, "streams": [ {"type": "@handle:mousedown","expr": "true"}, {"type": "mouseup","expr": "false"} ]   },    {      "name": "scaledHandlePosition", "streams": [ {         "type": "mousemove[isDragging]", "expr": "eventX", "scale": {"name": "yearsScale","invert": true} }     ]    },    {      "name": "currentYear", "init": 2000, "expr": "clamp(parseInt(scaledHandlePosition),1960,2013)" } ],  "data": [ {     "name": "highlights", "url": "wikiraw:///Extension:Graph/Demo/RawData:FertilityByCountryHistoric-csv", "format": {"type": "csv"}, "transform": [ {         "type": "formula", "field": "v", "expr": "parseFloat(datum[''+currentYear])" }     ]    },    {      "name": "countries", "url": "wikiraw:///Extension:Graph/Demo/RawData:WorldMap-iso3-json", "format": {"type": "topojson","feature": "countries"}, "transform": [ {         "type": "geopath", "value": "data", "scale": 80, "center": [-180,125], "translate": [0,0], "projection": "equirectangular" },       {          "type": "lookup", "keys": ["id"], "on": "highlights", "onKey": "id", "as": ["zipped"], "default": {"v": null, "country":"No data"} }     ]    }  ],  "scales": [ {     "name": "yearsScale", "type": "linear", "zero": false, "domain": [1960,2013], "range": "width" },   {      "name": "color", "type": "linear", "domain": {"data": "countries","field": "zipped.v"}, "domainMin": 1, "zero": false, "range": ["#FFEDBC", "#f83600"] } ],  "marks": [ {     "name": "yearLabel", "type": "text", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 25}, "fontSize": {"value": 32}, "fontWeight": {"value": "bold"}, "fill": {"value": "steelblue"} },       "update": {"text": {"signal": "currentYear"}} }   },    {      "name": "scrollLine", "type": "rule", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 40}, "x2": {"value": 500}, "stroke": {"value": "#000"}, "strokeWidth": {"value": 2} }     }    },    {      "name": "handle", "type": "path", "properties": { "enter": { "y": {"value": 40}, "path": {"value": "m-5.5,-10l0,20l11.5,-10l-11.5,-10z"}, "stroke": {"value": "#880"}, "strokeWidth": {"value": 2.5} },       "update": { "x": {"scale": "yearsScale","signal": "currentYear"}, "fill": {"value": "#fff"} },       "hover": {"fill": {"value": "#f00"}} }   },    {      "name": "map", "type": "path", "from": {"data": "countries"}, "properties": { "enter": {"path": {"field": "layout_path"}}, "update": { "fill": [ {             "test": "datum.zipped.v !== null", "scale": "color", "field": "zipped.v"           }, {"value": "grey"} ]       },        "hover": {"fill": {"value": "#989898"}} }   }  ],  "legends": [ {     "fill": "color", "title": "Fertility", "offset": -300, "properties": { "gradient": { "stroke": {"value": "transparent"} },       "title": { "fontSize": {"value": 14} },       "legend": { "x": {"value": 0}, "y": {"value": 180} }     }    }  ] }



Ajouter des statistiques
The map mouseover event will cause the country and the associated rate show up in the right corner. Note the use of \u007b and \u007d instead of the { and } braces. This is not needed if this graph is inserted directly inside the tag, but it will prevent issues when graph is used together with the.

 { "version": 2, "width": 500, "height": 260, "padding": 12, "background": "#edf1f7", "signals": [ {     "name": "isDragging", "init": false, "streams": [ {"type": "@handle:mousedown","expr": "true"}, {"type": "mouseup","expr": "false"} ]   },    {      "name": "scaledHandlePosition", "streams": [ {         "type": "mousemove[isDragging]", "expr": "eventX", "scale": {"name": "yearsScale","invert": true} }     ]    },    {      "name": "currentYear", "init": 2000, "expr": "clamp(parseInt(scaledHandlePosition),1960,2013)" },   {      "name": "tooltipSignal", "init": {"expr": "{x: 0, y: 0, datum: {} }"}, "streams": [ {           "type": "@map:mouseover", "expr": "{x: eventX, y: eventY, datum: eventItem.datum.zipped}" },       {            "type": "@map:mouseout", "expr": "{x: 0, y: 0, datum: {} }" }     ]     }  ],  "data": [ {     "name": "highlights", "url": "wikiraw:///Extension:Graph/Demo/RawData:FertilityByCountryHistoric-csv", "format": {"type": "csv"}, "transform": [ {         "type": "formula", "field": "v", "expr": "parseFloat(datum[''+currentYear])" }     ]    },    {      "name": "countries", "url": "wikiraw:///Extension:Graph/Demo/RawData:WorldMap-iso3-json", "format": {"type": "topojson","feature": "countries"}, "transform": [ {         "type": "geopath", "value": "data", "scale": 80, "center": [-180,125], "translate": [0,0], "projection": "equirectangular" },       {          "type": "lookup", "keys": ["id"], "on": "highlights", "onKey": "id", "as": ["zipped"], "default": {"v": null, "country":"No data"} }     ]    }  ],  "scales": [ {     "name": "yearsScale", "type": "linear", "zero": false, "domain": [1960,2013], "range": "width" },   {      "name": "color", "type": "linear", "domain": {"data": "countries","field": "zipped.v"}, "domainMin": 1, "zero": false, "range": ["#FFEDBC", "#f83600"] } ],  "marks": [ {     "name": "yearLabel", "type": "text", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 25}, "fontSize": {"value": 32}, "fontWeight": {"value": "bold"}, "fill": {"value": "steelblue"} },       "update": {"text": {"signal": "currentYear"}} }   },    {      "name": "scrollLine", "type": "rule", "properties": { "enter": { "x": {"value": 0}, "y": {"value": 40}, "x2": {"value": 500}, "stroke": {"value": "#000"}, "strokeWidth": {"value": 2} }     }    },    {      "name": "handle", "type": "path", "properties": { "enter": { "y": {"value": 40}, "path": {"value": "m-5.5,-10l0,20l11.5,-10l-11.5,-10z"}, "stroke": {"value": "#880"}, "strokeWidth": {"value": 2.5} },       "update": { "x": {"scale": "yearsScale","signal": "currentYear"}, "fill": {"value": "#fff"} },       "hover": {"fill": {"value": "#f00"}} }   },    {      "name": "map", "type": "path", "from": {"data": "countries"}, "properties": { "enter": {"path": {"field": "layout_path"}}, "update": { "fill": [ {             "test": "datum.zipped.v !== null", "scale": "color", "field": "zipped.v"           }, {"value": "grey"} ]       },        "hover": {"fill": {"value": "#989898"}} }   },    {      "type": "text", "properties": { "enter": { "x": {"value": 500}, "y": {"value": 10}, "align": {"value": "right"}, "fontSize": {"value": 17}, "fill": {"value": "black"} },       "update": { "text": {"template": "\u007b{tooltipSignal.datum.country}\u007d \u007b{tooltipSignal.datum.v}\u007d"} }     }    }  ],  "legends": [ {     "fill": "color", "title": "Fertility", "offset": -300, "properties": { "gradient": { "stroke": {"value": "transparent"} },       "title": { "fontSize": {"value": 14} },       "legend": { "x": {"value": 0}, "y": {"value": 180} }     }    }  ] }