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    CanvasRenderingContext2D.strokeRect()

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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  

    Browser compatibility

    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)

    See also

    Tag del documento e collaboratori

    Tag: 
     Hanno collaborato alla realizzazione di questa pagina: fscholz
     Ultima modifica di: fscholz,