Extension:Graph/Demo/fr

Cette page donne quelques exemples de ce que peut faire l'extension Graph. Graphs use Vega grammar (documentation) as underlying technology. Vega team is working on other tools to make Graphs easier to use. For interactive graphs this tutorial will explain building graphs step by step. For other graph ideas, see Vega examples.

Modèles de Graph
The easiest way to use graphs is via pre-built templates such as the Graph:Chart (available on many Wikipedias), or more specialized PieChart. Graph:Chart supports many common graph types such as line, area, and pie charts:



Exemples interactifs de Vega 2.0
See tutorial how to build this:

Extension:Graph/Demo/Dimpvis

Extension:Graph/Demo/Airports

Extension:Graph/Demo/OverviewDetail

Extension:Graph/Demo/IndexChart

Utiliser l'API RESTBase
Show pageview graphs for a range of dates, using pageview analytics API. See.

 Current page and en.wikipedia.org's main page for the last 30 days 

 Current page and en.wikipedia main page for the last 30 days - per type

Utiliser l'API MediaWiki
This graph shows edit history for a wiki page. See.

This graph shows the number of pages in each subcategory. See graph source code.

Utiliser l'API de requête de service Wikidata
See more examples.

Arbre cartésien
Extension:Graph/Demo/CartesianTree

Radial tree
Extension:Graph/Demo/RadialTree

Dendrogram
Extension:Graph/Demo/Dendrogram

Agenda /cycle de vie
{ "width": 800, "height": 200, "data": [ {     "name": "people", "values": [ {"label":"Washington", "born":-7506057600000, "died":-5366196000000, "enter":-5701424400000, "leave":-5453884800000}, {"label":"Adams",     "born":-7389766800000, "died":-4528285200000, "enter":-5453884800000, "leave":-5327740800000}, {"label":"Jefferson", "born":-7154586000000, "died":-4528285200000, "enter":-5327740800000, "leave":-5075280000000}, {"label":"Madison",   "born":-6904544400000, "died":-4213184400000, "enter":-5075280000000, "leave":-4822819200000}, {"label":"Monroe",    "born":-6679904400000, "died":-4370518800000, "enter":-4822819200000, "leave":-4570358400000} ]   },    {      "name": "events", "format": {"type":"json", "parse":{"when":"date"}}, "values": [ {"name":"Decl. of Independence", "when":"July 4, 1776"}, {"name":"U.S. Constitution",    "when":"3/4/1789"}, {"name":"Louisiana Purchase",   "when":"April 30, 1803"}, {"name":"Monroe Doctrine",      "when":"Dec 2, 1823"} ]   }

], "scales": [ {     "name": "y", "type": "ordinal", "range": "height", "domain": {"data": "people", "field": "label"} },   {      "name": "x", "type": "time", "range": "width", "round": true, "nice": "year", "domain": {"data": "people", "field": ["born", "died"]} } ],  "axes": [ {     "type": "x", "scale": "x", "properties": {"labels": {"fontSize": {"value": 18}}} } ],  "marks": [ {     "type": "text", "from": {"data": "events"}, "properties": { "enter": { "x": {"scale": "x", "field": "when"}, "y": {"value": -10}, "angle": {"value": -25}, "fill": {"value": "#000"}, "text": {"field": "name"}, "font": {"value": "Helvetica Neue"}, "fontSize": {"value": 20} }     }    },    {      "type": "rect", "from": {"data": "events"}, "properties": { "enter": { "x": {"scale": "x", "field": "when"}, "y": {"value": -8}, "width": {"value": 1}, "height": {"field": {"group": "height"}, "offset": 8}, "fill": {"value": "#888"} }     }    },    {      "type": "text", "from": {"data": "people"}, "properties": { "enter": { "x": {"scale": "x", "field": "born"}, "y": {"scale": "y", "field": "label", "offset": -3}, "fill": {"value": "#000"}, "text": {"field": "label"}, "font": {"value": "Helvetica Neue"}, "fontSize": {"value": 20} }     }    },    {      "type": "rect", "from": {"data": "people"}, "properties": { "enter": { "x": {"scale": "x", "field": "born"}, "x2": {"scale": "x", "field": "died"}, "y": {"scale": "y", "field": "label"}, "height": {"value": 2}, "fill": {"value": "#557"} }     }    },    {      "type": "rect", "from": {"data": "people"}, "properties": { "enter": { "x": {"scale": "x", "field": "enter"}, "x2": {"scale": "x", "field": "leave"}, "y": {"scale": "y", "field": "label", "offset":-1}, "height": {"value": 4}, "fill": {"value": "#e44"} }     }    }  ] }

D'autres exemples de cartes
This transcludes the page Extension:Graph/Demo/Map. The  tag's JSON data on that page specifies that its   data comes from a separate URL, Extension:Graph/Demo/RawData:WorldMap-iso2-json, that contains map data in JSON format. One of the elements in the  tag's JSON data specifies a highlight color for each country, in the format  :

Vega usually works with data in the format, so I created a helper Lua function to convert the data:

The Lua function's output is data in Vega's format:

Here is a more complex data processing example: MapTemplate is expanded with the data from Lua which takes it from the 2010 population distribution in the world (data based on UN data). To generate this graph, I use Lua module Graph:Utils's function  to extract the year 2010 column from the Extension:Graph/Demo/RawData:PopulationByCountryHistoric-csv page (in csv format), and pass that data as the first unnamed parameter to the MapTemplate graph. Additional optional parameter specifies that it should be scaled to 80%.



Note how the legend it wrongly positioned. That won't happen at lower scales.

Passer les paramètres des modèles MediaWiki
If you're using a wiki page as a template, you can pass parameters to it, like any other MediaWiki template.

As an example, the graph specification in TemplateSample does not hardcode a fill color for ; instead it sets the fill color to. So if you visit that page or transclude it with no parameter, the graph fills with color  ; but if you transclude that page you can specify the fill color as the first template parameter.



Utilisation de modèle pour les graphiques répétés
This is very useful if you have multiple graphs of the same form: you can put the verbose graph JSON and additional repetive wikitext in a template and only pass the parameters to it that vary, such as title and values. See a sample of this approach.

Recouvrement de deux types de données
Falkensee graph sample, see code.

Transclure directement avec
This example is a  tag containing the graph JSON inside the current page.

{ "version": 2, "width": 400, "height": 200, "padding": {"top": 10, "left": 30, "bottom": 30, "right": 10}, "data": [ {     "name": "table", "values": [ {"x": 1, "y": 28}, {"x": 2,  "y": 55}, {"x": 3, "y": 43}, {"x": 4,  "y": 91}, {"x": 5, "y": 81}, {"x": 6,  "y": 53}, {"x": 7, "y": 19}, {"x": 8,  "y": 87}, {"x": 9, "y": 52}, {"x": 10, "y": 48}, {"x": 11, "y": 24}, {"x": 12, "y": 49}, {"x": 13, "y": 87}, {"x": 14, "y": 66}, {"x": 15, "y": 17}, {"x": 16, "y": 27}, {"x": 17, "y": 68}, {"x": 18, "y": 16}, {"x": 19, "y": 49}, {"x": 20, "y": 15} ]   }  ],  "scales": [ {     "name": "x", "type": "ordinal", "range": "width", "domain": {"data": "table", "field": "x"} },   {      "name": "y", "range": "height", "nice": true, "domain": {"data": "table", "field": "y"} } ],  "axes": [ {"type": "x", "scale": "x"}, {"type": "y", "scale": "y"} ], "marks": [ {     "type": "rect", "from": {"data": "table"}, "properties": { "enter": { "x": {"scale": "x", "field": "x"}, "width": {"scale": "x", "band": true, "offset": -1}, "y": {"scale": "y", "field": "y"}, "y2": {"scale": "y", "value": 0} },       "update": { "fill": {"value": "steelblue"} },       "hover": { "fill": {"value": "red"} }     }    }  ] }

Graphe avec barres horizontales
Extension:Graph/Demo/HorizontalBarGraphSample

Modifier les données du graphique
Editing JSON by hand is fiddly and prone to error. so you should use a JSON checker such as JSONLint or a JSON editor such as the Vega Live Editor to edit JSON before you copy and paste it into the wiki page. If the  tag's data is directly embedded in the page such as the example above, then if you use VisualEditor to edit the page you can directly edit graph data.