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| author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:42:17 -0500 |
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| committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:42:17 -0500 |
| commit | da78a9e329e272dedb2400b79a3bdeebff387d47 (patch) | |
| tree | e6ef8aa7c43556f55ddfe031a01cf0a8fa271bfe /files/it/web/javascript/reference/global_objects/math/atan2 | |
| parent | 1109132f09d75da9a28b649c7677bb6ce07c40c0 (diff) | |
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| -rw-r--r-- | files/it/web/javascript/reference/global_objects/math/atan2/index.html | 155 |
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diff --git a/files/it/web/javascript/reference/global_objects/math/atan2/index.html b/files/it/web/javascript/reference/global_objects/math/atan2/index.html new file mode 100644 index 0000000000..842106f7a1 --- /dev/null +++ b/files/it/web/javascript/reference/global_objects/math/atan2/index.html @@ -0,0 +1,155 @@ +--- +title: Math.atan2() +slug: Web/JavaScript/Reference/Global_Objects/Math/atan2 +tags: + - Arcotangente + - JavaScript + - Math + - metodo +translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan2 +--- +<div>{{JSRef}}</div> + +<p>La funzione <strong><code>Math.atan2() </code></strong>restituisce l'arcotangente del quoziente dei suoi argomenti.</p> + +<h2 id="Sintassi">Sintassi</h2> + +<pre class="syntaxbox"><code>Math.atan2(<var>y</var>, <var>x</var>)</code></pre> + +<h3 id="Parametri">Parametri</h3> + +<dl> + <dt><code>y</code></dt> + <dd>Primo numero.</dd> + <dt><code>x</code></dt> + <dd>Secondo numero.</dd> +</dl> + +<h3 id="Valore_restituito">Valore restituito</h3> + +<p>L'arcotangente del quoziente degli argomenti forniti alla funzione, espresso in radianti e compreso tra -π e π.</p> + +<h2 id="Descrizione">Descrizione</h2> + +<p>Il metodo <code>Math.atan2()</code> restituisce un valore compreso tra -π e π che reppresenta l'angolo teta di un punto <code>(x, y)</code>. Questo angolo è orientato in senso antiorario, misurato in radianti e compreso tra l'asse positivo delle ascisse, ed il punto <code>(x, y)</code>. È importante ricordare che il primo argomento da fornire alla funzione è l'ordinata del punto ed il secondo la sua ascissa.</p> + +<p><img alt="A simple diagram showing the angle returned by atan2(y, x)" src="https://mdn.mozillademos.org/files/11557/atan2.png" style="height: 300px; width: 300px;"></p> + +<p><code>A Math.atan2()</code> vengono passate x ed y separatamente, mentre a <code>Math.atan()</code> deve essere passato il loro quoziente.</p> + +<p>Poichè <code>atan2()</code> è un metodo statico di <code>Math </code>esso viene sempre utilizzato nella forma <code>Math.atan2()</code>, invece che come metodo di un oggetto <code>Math </code>che hai personalmente creato (<code>Math</code> non è un costruttore).</p> + +<h2 id="Examples">Examples</h2> + +<h3 id="Using_Math.atan2()">Using <code>Math.atan2()</code></h3> + +<pre class="brush: js">Math.atan2(90, 15); // 1.4056476493802699 +Math.atan2(15, 90); // 0.16514867741462683 + +Math.atan2(±0, -0); // ±PI. +Math.atan2(±0, +0); // ±0. +Math.atan2(±0, -x); // ±PI con x > 0. +Math.atan2(±0, x); // ±0 con x > 0. +Math.atan2(-y, ±0); // -PI/2 con y > 0. +Math.atan2(y, ±0); // PI/2 con y > 0. +Math.atan2(±y, -Infinity); // ±PI con y finito e y > 0. +Math.atan2(±y, +Infinity); // ±0 con y finito e y > 0. +Math.atan2(±Infinity, x); // ±PI/2 con x finito. +Math.atan2(±Infinity, -Infinity); // ±3*PI/4. +Math.atan2(±Infinity, +Infinity); // ±PI/4. +</pre> + +<h2 id="Specifications">Specifications</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + <tr> + <td>{{SpecName('ES1')}}</td> + <td>{{Spec2('ES1')}}</td> + <td>Initial definition. Implemented in JavaScript 1.0.</td> + </tr> + <tr> + <td>{{SpecName('ES5.1', '#sec-15.8.2.5', 'Math.atan2')}}</td> + <td>{{Spec2('ES5.1')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('ES6', '#sec-math.atan2', 'Math.atan2')}}</td> + <td>{{Spec2('ES6')}}</td> + <td> </td> + </tr> + <tr> + <td>{{SpecName('ESDraft', '#sec-math.atan2', 'Math.atan2')}}</td> + <td>{{Spec2('ESDraft')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<div>{{CompatibilityTable}}</div> + +<div id="compat-desktop"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Firefox (Gecko)</th> + <th>Internet Explorer</th> + <th>Opera</th> + <th>Safari</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<div id="compat-mobile"> +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Chrome for Android</th> + <th>Firefox Mobile (Gecko)</th> + <th>IE Mobile</th> + <th>Opera Mobile</th> + <th>Safari Mobile</th> + </tr> + <tr> + <td>Basic support</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + <td>{{CompatVersionUnknown}}</td> + </tr> + </tbody> +</table> +</div> + +<h2 id="See_also">See also</h2> + +<ul> + <li>{{jsxref("Math.acos()")}}</li> + <li>{{jsxref("Math.asin()")}}</li> + <li>{{jsxref("Math.atan()")}}</li> + <li>{{jsxref("Math.cos()")}}</li> + <li>{{jsxref("Math.sin()")}}</li> + <li>{{jsxref("Math.tan()")}}</li> +</ul> |
