From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- .../quadraticcurveto/index.html | 182 +++++++++++++++++++++ 1 file changed, 182 insertions(+) create mode 100644 files/pt-br/web/api/canvasrenderingcontext2d/quadraticcurveto/index.html (limited to 'files/pt-br/web/api/canvasrenderingcontext2d/quadraticcurveto') 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 +--- +
{{APIRef}}
+ +

o método CanvasRenderingContext2D.quadraticCurveTo() 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 moveTo() before creating the quadratic Bézier curve.

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Sintaxe

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void ctx.quadraticCurveTo(cpx, cpy, x, y);
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+ +

Parâmetros

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+
cpx
+
O eixo X da coordenada para o ponto de controle.
+
cpy
+
O eixo Y da coordenada para o ponto de controle.
+
x
+
O eixo X da coordenada para o ponto final.
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y
+
O eixo Y da coordenada para o ponto final.
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+ +

Exemplos

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Usando o método quadraticCurveTo

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This is just a simple code snippet drawing a quadratic bezier curve. The control point is red and the start and end points are blue.

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HTML

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<canvas id="canvas"></canvas>
+
+ +

JavaScript

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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);
+ +

{{ EmbedLiveSample('Using_the_quadraticCurveTo_method', 315, 165) }}

+ +

Trying the quadraticCurveTo parameters

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Edit the code below and see your changes update live in the canvas:

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+
<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>
+
+ +
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);
+
+
+ +

{{ EmbedLiveSample('Trying_the_quadraticCurveTo_parameters', 700, 360) }}

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Especificações

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SpecificationStatusComment
{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-quadraticcurveto", "CanvasRenderingContext2D.quadraticCurveTo")}}{{Spec2('HTML WHATWG')}} 
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Browser compatibility

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{{CompatibilityTable}}

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{{CompatVersionUnknown}} + + + + + + + + + + + + + + + + + + + + +
FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
+ +
{{CompatVersionUnknown}} + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidChrome for AndroidEdgeFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
+
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Veja também

+ + -- cgit v1.2.3-54-g00ecf