1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
---
title: Math.atan2()
slug: Web/JavaScript/Reference/Global_Objects/Math/atan2
translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan2
---
<div>{{JSRef}}</div>
<p>A função <strong><code>Math.atan2()</code></strong> retorna o arco tangente do coeficiente dos argumentos passado.</p>
<h2 id="Sintaxe">Sintaxe</h2>
<pre class="syntaxbox"><code>Math.atan2(<var>y</var>, <var>x</var>)</code></pre>
<h3 id="Parâmentros">Parâmentros</h3>
<dl>
<dt><code>y</code></dt>
<dd>Primeiro numero.</dd>
<dt><code>x</code></dt>
<dd>Segundo numero.</dd>
</dl>
<h3 id="Retorno">Retorno</h3>
<p>O arco tagente do coegiente dos parâmetros</p>
<h2 id="Descrição">Descrição</h2>
<p>O <code>Math.atan2()</code> método retorna um valor numérico entre -π e π representando o ângulo teta entre (x, y). Assim indo no sentido anti-horario ao ângulo, medido em radianos, entre o eixo X positivo, e o ponto<code>(x, y)</code>.Nota os argumentos para essa função: primeiro o eixo Y(ordenadas) e o eixo X(absissas) como segundo parâmetro.</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>Math.atan2()os argumentos são passados separados x e y enquanto no Math.atan() é passado a razão entre esses argumentos.</code></p>
<p>Porque <code>atan2()</code> é um método estático de <code>Math</code>, você sempre usará <code>Math.atan2()</code>, ao inves de um objeto Math criado (<code>Math</code> não é um construtor).</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 for x > 0.
Math.atan2(±0, x); // ±0 for x > 0.
Math.atan2(-y, ±0); // -PI/2 for y > 0.
Math.atan2(y, ±0); // PI/2 for y > 0.
Math.atan2(±y, -Infinity); // ±PI for finite y > 0.
Math.atan2(±y, +Infinity); // ±0 for finite y > 0.
Math.atan2(±Infinity, x); // ±PI/2 for finite x.
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">Compatibilidade com navegadores</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="Veja_também">Veja também</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>
|
