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<div id="function.imageantialias" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imageantialias</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.3.2, PHP 5, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">imageantialias</span> &mdash; <span class="dc-title">Utiliser ou non les fonctions d&#039;antialias</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imageantialias-description">
  <h3 class="title">Description</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>imageantialias</strong></span>(<span class="methodparam"><span class="type"><a href="class.gdimage.php" class="type GdImage">GdImage</a></span> <code class="parameter">$image</code></span>, <span class="methodparam"><span class="type"><a href="language.types.boolean.php" class="type bool">bool</a></span> <code class="parameter">$enable</code></span>): <span class="type"><a href="language.types.singleton.php" class="type true">true</a></span></div>

  <p class="para rdfs-comment">
   Active les méthodes de dessin rapide antialias concernant les lignes et les polygones.
   Les composantes alpha ne sont pas supportées. Fonctionne en utilisant une opération
   directe de mélange, uniquement avec les images truecolor.
  </p>
  <p class="para">
   L&#039;épaisseur et les styles ne sont pas supportés.
  </p>
  <p class="para">
   L&#039;utilisation des primitives antialias avec des arrière-plans transparents peut
   mener à des résultats imprévus. La méthode de mélange utilise
   la couleur d&#039;arrière-plan comme toute autre couleur. Le manque de support
   du composant alpha empêche l&#039;utilisation d&#039;antialias basé sur l&#039;alpha.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.imageantialias-parameters">
  <h3 class="title">Liste de paramètres</h3>
  <p class="para">
   <dl>
    
<dt><code class="parameter">image</code></dt><dd><p class="para">
 Un objet <span class="classname"><a href="class.gdimage.php" class="classname">GdImage</a></span>, retournée par une des fonctions de
 création d&#039;images, comme <span class="function"><a href="function.imagecreatetruecolor.php" class="function">imagecreatetruecolor()</a></span>.
</p></dd>
    
     <dt><code class="parameter">enable</code></dt>
     <dd>
      <p class="para">
       Si l&#039;on doit activer l&#039;antialias ou non.
      </p>
     </dd>
    
   </dl>
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.imageantialias-returnvalues">
  <h3 class="title">Valeurs de retour</h3>
  <p class="para">
   Retourne toujours <strong><code><a href="reserved.constants.php#constant.true">true</a></code></strong>.
  </p>
 </div>

 
 <div class="refsect1 changelog" id="refsect1-function.imageantialias-changelog">
  <h3 class="title">Historique</h3>
  <table class="doctable informaltable">
   
    <thead>
     <tr>
      <th>Version</th>
      <th>Description</th>
     </tr>

    </thead>

    <tbody class="tbody">
     <tr>
 <td>8.0.0</td>
 <td>
  <code class="parameter">image</code> attend une instance de <span class="classname"><a href="class.gdimage.php" class="classname">GdImage</a></span> désormais;
  auparavant, une <span class="type"><a href="language.types.resource.php" class="type resource">resource</a></span> <code class="literal">gd</code> était attendue.
 </td>
</tr>

     <tr>
      <td>7.2.0</td>
      <td>
       <span class="function"><strong>imageantialias()</strong></span> est maintenant généralement 
       disponible. Auparavant, elle était seulement disponible si PHP a été 
       compilé avec la version groupée de la bibliothèque GD.
      </td>
     </tr>

    </tbody>
   
  </table>

 </div>


 <div class="refsect1 examples" id="refsect1-function.imageantialias-examples">
  <h3 class="title">Exemples</h3>
  <p class="para">
   <div class="example" id="example-1">
    <p><strong>Exemple #1 Comparaison de 2 lignes, dont l&#039;une est anti-aliasée</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">// Définit une image anti-aliasée et une normale<br /></span><span style="color: #0000BB">$aa </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">400</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$normal </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Active l'antialiasing pour une image<br /></span><span style="color: #0000BB">imageantialias</span><span style="color: #007700">(</span><span style="color: #0000BB">$aa</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Alloue les couleurs<br /></span><span style="color: #0000BB">$red </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$normal</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$red_aa </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$aa</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Dessine 2 lignes, dont l'une avec l'antialiasing<br /></span><span style="color: #0000BB">imageline</span><span style="color: #007700">(</span><span style="color: #0000BB">$normal</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">$red</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imageline</span><span style="color: #007700">(</span><span style="color: #0000BB">$aa</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">$red_aa</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Fusionne les 2 images, côté par côté pour l'affichage<br />// (AA: gauche, Normal: Droit)<br /></span><span style="color: #0000BB">imagecopymerge</span><span style="color: #007700">(</span><span style="color: #0000BB">$aa</span><span style="color: #007700">, </span><span style="color: #0000BB">$normal</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">200</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Affichage de l'image<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$aa</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span></span></code></div>
    </div>

    <div class="example-contents"><p>Résultat de l&#039;exemple ci-dessus est similaire à :</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imageantialias.png" alt="Affichage de l'exemple : Une comparaison de 2 lignes, dont une avec un anti-aliasing" width="400" height="100" />
     </div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.imageantialias-seealso">
  <h3 class="title">Voir aussi</h3>
  <ul class="simplelist">
   <li><span class="function"><a href="function.imagecreatetruecolor.php" class="function" rel="rdfs-seeAlso">imagecreatetruecolor()</a> - Cr&eacute;e une nouvelle image en couleurs vraies</span></li>
  </ul>
 </div>

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