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CanvasRenderingContext2D.strokeRect()

この記事内

Syntax
1. Parameters
Examples
1. Using the strokeRect method
  1. HTML
  2. JavaScript
Specifications
Browser compatibility
See also

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The CanvasRenderingContext2D.strokeRect() method of the Canvas 2D API paints a rectangle which has a starting point at (x, y) and has a w width and an h height onto the canvas, using the current stroke style.

Syntax

void ctx.strokeRect(x, y, width, height);

Parameters

x: The x axis of the coordinate for the rectangle starting point.
y: The y axis of the coordinate for the rectangle starting point.
width: The rectangle's width.
height: The rectangle's height.

Examples

Using the `strokeRect` method

This is just a simple code snippet which uses the strokeRect method.

HTML

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

JavaScript

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

ctx.strokeStyle = "green";
ctx.strokeRect(10, 10, 100, 100);

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

Playable code

<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.strokeStyle = "green";
ctx.strokeRect(10, 10, 100, 100);</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);

Specifications

Specification	Status	Comment
WHATWG HTML Living Standard The definition of 'CanvasRenderingContext2D.strokeRect' in that specification.	Living Standard

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)

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このページの貢献者: fscholz

最終更新者: fscholz, 2015/02/22 18:46:41