CanvasRenderingContext2D.shadowOffsetX

The CanvasRenderingContext2D.shadowOffsetX property of the Canvas 2D API specifies the distance that the shadow will be offset in horizontal distance.

Syntax

<var>ctx.shadowOffsetX = offset;</var>

offset

A float specifying the distance that the shadow will be offset in horizontal distance. The default value is 0. Infinity or NaN values are ignored.

Examples

Using the shadowOffsetX property

This is just a simple code snippet using the shadowOffsetX property to set a shadow with a horizontal offset. Note that shadows are only drawn, if the shadowColor property is set to a non-transparent value, too.

HTML

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

JavaScript

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

ctx.shadowColor = "black";
ctx.shadowOffsetX = 10;
ctx.shadowBlur = 10;

ctx.fillStyle = "green";
ctx.fillRect(10, 10, 100, 100);

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

<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.shadowColor = "black";
ctx.shadowOffsetX = 10;
ctx.shadowBlur = 10;
ctx.fillStyle = "green";
ctx.fillRect(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

Browser compatibility

See also

• The interface defining it, CanvasRenderingContext2D.
• CanvasRenderingContext2D.shadowOffsetY
• CanvasRenderingContext2D.shadowColor
• CanvasRenderingContext2D.shadowBlur