{"id":10680,"date":"2019-11-21T01:45:35","date_gmt":"2019-11-20T23:45:35","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=10680"},"modified":"2019-11-21T01:45:35","modified_gmt":"2019-11-20T23:45:35","slug":"ggplot-gradient-de-couleurs","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/fr\/blog\/ggplot-gradient-de-couleurs\/","title":{"rendered":"GGPLOT Gradient de Couleurs"},"content":{"rendered":"<div id=\"rdoc\">\n<p>Cet article d\u00e9crit comment cr\u00e9er un <strong>graphe avec d\u00e9grad\u00e9 de couleur<\/strong>. Vous apprendrez comment changer la couleur du d\u00e9grad\u00e9 par d\u00e9faut de ggplot2, ainsi que comment d\u00e9finir le d\u00e9grad\u00e9 entre deux ou n couleurs.<\/p>\n<p>Sommaire:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#chargement-de-ggplot2\">Chargement de ggplot2<\/a><\/li>\n<li><a href=\"#couleurs-ggplot-par-defaut-du-degrade\">Couleurs ggplot par d\u00e9faut du d\u00e9grad\u00e9<\/a><\/li>\n<li><a href=\"#fonctions-cles-pour-changer-les-couleurs-de-degrade\">Fonctions cl\u00e9s pour changer les couleurs de d\u00e9grad\u00e9<\/a><\/li>\n<li><a href=\"#definir-le-degrade-entre-deux-couleurs\">D\u00e9finir le d\u00e9grad\u00e9 entre deux couleurs<\/a><\/li>\n<li><a href=\"#definir-le-gradient-entre-n-couleurs\">D\u00e9finir le gradient entre n couleurs<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<\/ul>\n<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div class='dt-sc-ico-content type1'><div class='custom-icon' ><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/fr\/produit\/ggplot2-lessentiel-pour-une-visualisation-magnifique-des-donnees-dans-r\/' target='_blank'> Livre Apparent\u00e9 <\/a><\/h4>GGPLOT2 - L\u2019Essentiel pour une Visualisation Magnifique des Donn\u00e9es dans R<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"chargement-de-ggplot2\" class=\"section level2\">\n<h2>Chargement de ggplot2<\/h2>\n<p>Le code R suivant charge le package R ggplot2 et d\u00e9finit le th\u00e8me par d\u00e9faut du graphique \u00e0 <code>theme_minimal()<\/code>.<\/p>\n<pre class=\"r\"><code>library(ggplot2)\r\ntheme_set(theme_minimal())<\/code><\/pre>\n<\/div>\n<div id=\"couleurs-ggplot-par-defaut-du-degrade\" class=\"section level2\">\n<h2>Couleurs ggplot par d\u00e9faut du d\u00e9grad\u00e9<\/h2>\n<p>Pour les couleurs en d\u00e9grad\u00e9, vous devez mapper l\u2019argument <code>color<\/code> et\/ou <code>fill<\/code> \u00e0 une variable continue. Le r\u00e9glage par d\u00e9faut de ggplot2 pour les couleurs d\u00e9grad\u00e9es est une couleur bleue continue.<\/p>\n<p>Dans l\u2019exemple suivant, nous colorions les points en fonction de la variable: <code>Sepal.Length<\/code>.<\/p>\n<pre class=\"r\"><code>sp &lt;- ggplot(iris, aes(Sepal.Length, Sepal.Width))+\r\n  geom_point(aes(color = Sepal.Length))\r\nsp<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/102-ggplot-color-gradient-default-colors-1.png\" width=\"384\" \/><\/p>\n<\/div>\n<div id=\"fonctions-cles-pour-changer-les-couleurs-de-degrade\" class=\"section level2\">\n<h2>Fonctions cl\u00e9s pour changer les couleurs de d\u00e9grad\u00e9<\/h2>\n<p>Les couleurs du d\u00e9grad\u00e9 par d\u00e9faut peuvent \u00eatre modifi\u00e9es \u00e0 l\u2019aide des fonctions ggplot2 suivantes:<\/p>\n<ul>\n<li><code>scale_color_gradient()``scale_fill_gradient()<\/code> pour les d\u00e9grad\u00e9s s\u00e9quentiels entre deux couleurs<\/li>\n<li><code>scale_color_gradient2()<\/code>, <code>scale_fill_gradient2()<\/code> pour les gradients divergents<\/li>\n<li><code>scale_color_gradientn()<\/code>, <code>scale_fill_gradientn()<\/code> pour le d\u00e9grad\u00e9 entre n couleurs<\/li>\n<\/ul>\n<\/div>\n<div id=\"definir-le-degrade-entre-deux-couleurs\" class=\"section level2\">\n<h2>D\u00e9finir le d\u00e9grad\u00e9 entre deux couleurs<\/h2>\n<p>Modifier les couleurs pour les extr\u00e9mit\u00e9s basse (<code>low<\/code>) et haute (<code>high<\/code>) du d\u00e9grad\u00e9:<\/p>\n<pre class=\"r\"><code># Sch\u00e9ma de couleurs s\u00e9quentielles. \r\n# Sp\u00e9cifiez les couleurs pour les extr\u00e9mit\u00e9s basse et haute du d\u00e9grad\u00e9\r\nsp + scale_color_gradient(low = \"blue\", high = \"red\")\r\n\r\n# Sch\u00e9ma de couleurs divergentes\r\n# Sp\u00e9cifiez \u00e9galement la couleur du point m\u00e9dian\r\nmid &lt;- mean(iris$Sepal.Length)\r\nsp + scale_color_gradient2(midpoint = mid, low = \"blue\", mid = \"white\",\r\n                            high = \"red\", space = \"Lab\" )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/102-ggplot-color-gradient-scale_color_gradient-1.png\" width=\"355.2\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/102-ggplot-color-gradient-scale_color_gradient-2.png\" width=\"355.2\" \/><\/p>\n<div class=\"success\">\n<p>Notez que les fonctions <code>scale_color_continuous()<\/code> et <code>scale_fill_continuous()<\/code> peuvent \u00e9galement \u00eatre utilis\u00e9es pour d\u00e9finir les couleurs en d\u00e9grad\u00e9 ou gradient.<\/p>\n<\/div>\n<\/div>\n<div id=\"definir-le-gradient-entre-n-couleurs\" class=\"section level2\">\n<h2>D\u00e9finir le gradient entre n couleurs<\/h2>\n<p>Dans l\u2019exemple ci-dessous, nous allons utiliser la fonction de base R <code>rainbow()<\/code> pour g\u00e9n\u00e9rer un vecteur de 5 couleurs, qui sera utilis\u00e9 pour d\u00e9finir les couleurs du d\u00e9grad\u00e9.<\/p>\n<pre class=\"r\"><code>sp + scale_color_gradientn(colours = rainbow(5))<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/102-ggplot-color-gradient-scale-color-gradientn-1.png\" width=\"384\" \/><\/p>\n<\/div>\n<div id=\"conclusion\" class=\"section level2\">\n<h2>Conclusion<\/h2>\n<p>Ce tutoriel montre comment d\u00e9finir les couleurs de d\u00e9grad\u00e9 dans ggplot2.<\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cet article d\u00e9crit comment cr\u00e9er un graphe avec d\u00e9grad\u00e9 de couleur. Vous apprendrez comment changer la couleur du d\u00e9grad\u00e9 par d\u00e9faut de ggplot2, ainsi que comment d\u00e9finir le d\u00e9grad\u00e9 entre [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10681,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[279,278],"tags":[284],"class_list":["post-10680","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2-fr","category-r-trucs-et-astuces","tag-couleurs-dans-r"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>GGPLOT Gradient de Couleurs: Meilleur R\u00e9f\u00e9rence - Datanovia<\/title>\n<meta name=\"description\" content=\"You will learn how to change the ggplot2 default gradient color, as well as, how to set gradient between two or n colors.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.datanovia.com\/en\/fr\/blog\/ggplot-gradient-de-couleurs\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GGPLOT Gradient de Couleurs: Meilleur R\u00e9f\u00e9rence - 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