CanvasRenderingContext2D.drawImage()

The CanvasRenderingContext2D.drawImage() method of the Canvas 2D API provides different ways to draw an image onto the canvas.

Syntax

void <var>ctx.drawImage(image, dx, dy);</var>
void <var>ctx.drawImage(image, dx, dy, dWidth, dHeight);</var>
void <var>ctx.drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight);</var>

Parameters

image

An element to draw into the context. The specification permits any canvas image source (CanvasImageSource), such as an HTMLImageElement, an HTMLVideoElement, an HTMLCanvasElement or an ImageBitmap.

dx

The X coordinate in the destination canvas at which to place the top-left corner of the source image.

dy

The Y coordinate in the destination canvas at which to place the top-left corner of the source image.

dWidth

The width to draw the image in the destination canvas. This allows scaling of the drawn image. If not specified, the image is not scaled in width when drawn.

dHeight

The height to draw the image in the destination canvas. This allows scaling of the drawn image. If not specified, the image is not scaled in height when drawn.

sx

The X coordinate of the top left corner of the sub-rectangle of the source image to draw into the destination context.

sy

The Y coordinate of the top left corner of the sub-rectangle of the source image to draw into the destination context.

sWidth

The width of the sub-rectangle of the source image to draw into the destination context. If not specified, the entire rectangle from the coordinates specified by sx and sy to the bottom-right corner of the image is used.

sHeight

The height of the sub-rectangle of the source image to draw into the destination context.

Exceptions thrown

INDEX_SIZE_ERR

If the canvas or source rectangle width or height is zero.

INVALID_STATE_ERR

The image has no image data.

TYPE_MISMATCH_ERR

The specified source element isn't supported.

Examples

Using the drawImage method

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

HTML

<canvas id="canvas"></canvas>
<div style="display:none;">
  <img id="source" src="https://mdn.mozillademos.org/files/5397/rhino.jpg"
       width="300" height="227">
</div>

JavaScript

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

ctx.drawImage(image, 33, 71, 104, 124, 21, 20, 87, 104);

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 style="display:none;">
  <img id="source" src="https://mdn.mozillademos.org/files/5397/rhino.jpg" width="300" height="227">
</div>
<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.drawImage(image, 33, 71, 104, 124, 21, 20, 87, 104);</textarea>

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

Compatibility notes

• Support for flipping the image by using negative values for sw and sh was added in Gecko 5.0 (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2).
• Starting with (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2) drawImage() handles negative arguments in accordance with the specification, by flipping the rectangle around the appropriate axis.
• Specifying a null or undefined image when calling or drawImage() correctly throws a TYPE_MISMATCH_ERR exception starting with (Firefox 5.0 / Thunderbird 5.0 / SeaMonkey 2.2).
• Prior to Gecko 7.0 (Firefox 7.0 / Thunderbird 7.0 / SeaMonkey 2.4), Firefox threw an exception if any of the coordinate values was non-finite or zero. As per the specification, this no longer happens.
• Gecko 9.0 (Firefox 9.0 / Thunderbird 9.0 / SeaMonkey 2.6) now correctly supports CORS for drawing images across domains without tainting the canvas.
• Gecko 11.0 (Firefox 11.0 / Thunderbird 11.0 / SeaMonkey 2.8) now allows SVG-as-an-image to be drawn into a canvas without tainting the canvas.

Notes

• drawImage() only works correctly on an HTMLVideoElement when its HTMLMediaElement.readyState is greater than 1 (i.e, seek event fired after setting the currentTime property)

See also

• The interface defining it, CanvasRenderingContext2D.