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diff --git a/files/pt-br/web/api/canvasrenderingcontext2d/quadraticcurveto/index.html b/files/pt-br/web/api/canvasrenderingcontext2d/quadraticcurveto/index.html new file mode 100644 index 0000000000..b60b7de07c --- /dev/null +++ b/files/pt-br/web/api/canvasrenderingcontext2d/quadraticcurveto/index.html @@ -0,0 +1,182 @@ +--- +title: CanvasRenderingContext2D.quadraticCurveTo() +slug: Web/API/CanvasRenderingContext2D/quadraticCurveTo +translation_of: Web/API/CanvasRenderingContext2D/quadraticCurveTo +--- +<div>{{APIRef}}</div> + +<p>o método <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.quadraticCurveTo()</code></strong> da API Canvas 2D adiciona uma Curva de Bézier quadrática ao caminho. São exigidos dois pontos. O primeiro ponto é um ponto de controle e o segundo é o ponto final. The starting point is the last point in the current path, which can be changed using <code>moveTo()</code> before creating the quadratic Bézier curve.</p> + +<h2 id="Sintaxe">Sintaxe</h2> + +<pre class="syntaxbox">void <var><em>ctx</em>.quadraticCurveTo(cpx, cpy, x, y);</var> +</pre> + +<h3 id="Parâmetros">Parâmetros</h3> + +<dl> + <dt><code>cpx</code></dt> + <dd>O eixo X da coordenada para o ponto de controle.</dd> + <dt><code>cpy</code></dt> + <dd>O eixo Y da coordenada para o ponto de controle.</dd> + <dt><code>x</code></dt> + <dd>O eixo X da coordenada para o ponto final.</dd> + <dt><code>y</code></dt> + <dd>O eixo Y da coordenada para o ponto final.</dd> +</dl> + +<h2 id="Exemplos">Exemplos</h2> + +<h3 id="Usando_o_método_quadraticCurveTo">Usando o método <code>quadraticCurveTo</code></h3> + +<p>This is just a simple code snippet drawing a quadratic bezier curve. The <span style="color: red;">control point is red</span> and the <span style="color: blue;">start and end points are blue</span>.</p> + +<h4 id="HTML">HTML</h4> + +<pre class="brush: html"><canvas id="canvas"></canvas> +</pre> + +<h4 id="JavaScript">JavaScript</h4> + +<pre class="brush: js; highlight:[6]">var canvas = document.getElementById('canvas'); +var ctx = canvas.getContext('2d'); + +ctx.beginPath(); +ctx.moveTo(50,20); +ctx.quadraticCurveTo(230, 30, 50, 100); +ctx.stroke(); + +ctx.fillStyle = 'blue'; +// start point +ctx.fillRect(50, 20, 10, 10); +// end point +ctx.fillRect(50, 100, 10, 10); + +ctx.fillStyle = 'red'; +// control point +ctx.fillRect(230, 30, 10, 10);</pre> + +<p>{{ EmbedLiveSample('Using_the_quadraticCurveTo_method', 315, 165) }}</p> + +<h3 id="Trying_the_quadraticCurveTo_parameters">Trying the <code>quadraticCurveTo</code> parameters</h3> + +<p>Edit the code below and see your changes update live in the canvas:</p> + +<div style="display: none;"> +<pre class="brush: html"><canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> +<div class="playable-buttons"> + <input id="edit" type="button" value="Edit" /> + <input id="reset" type="button" value="Reset" /> +</div> +<textarea id="code" class="playable-code"> +ctx.beginPath(); +ctx.moveTo(50,20); +ctx.quadraticCurveTo(230, 30, 50, 100); +ctx.stroke();</textarea> +</pre> + +<pre class="brush: js">var canvas = document.getElementById("canvas"); +var ctx = canvas.getContext("2d"); +var textarea = document.getElementById("code"); +var reset = document.getElementById("reset"); +var edit = document.getElementById("edit"); +var code = textarea.value; + +function drawCanvas() { + ctx.clearRect(0, 0, canvas.width, canvas.height); + eval(textarea.value); +} + +reset.addEventListener("click", function() { + textarea.value = code; + drawCanvas(); +}); + +edit.addEventListener("click", function() { + textarea.focus(); +}) + +textarea.addEventListener("input", drawCanvas); +window.addEventListener("load", drawCanvas); +</pre> +</div> + +<p>{{ EmbedLiveSample('Trying_the_quadraticCurveTo_parameters', 700, 360) }}</p> + +<h2 id="Especificações">Especificações</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('HTML WHATWG', "scripting.html#dom-context-2d-quadraticcurveto", "CanvasRenderingContext2D.quadraticCurveTo")}}</td> + <td>{{Spec2('HTML WHATWG')}}</td> + <td> </td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility">Browser compatibility</h2> + +<p>{{CompatibilityTable}}</p> + +<div id="compat-desktop">{{CompatVersionUnknown}} +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Chrome</th> + <th>Edge</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">{{CompatVersionUnknown}} +<table class="compat-table"> + <tbody> + <tr> + <th>Feature</th> + <th>Android</th> + <th>Chrome for Android</th> + <th>Edge</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>The interface defining it, {{domxref("CanvasRenderingContext2D")}}</li> + <li><a href="http://en.wikipedia.org/wiki/B%C3%A9zier_curve">WikiPedia article on Bézier curves</a>.</li> +</ul> |