HTML Canvas Drawing

Draw on the Canvas With JavaScript

All drawing on the HTML canvas must be done with JavaScript:

Example

<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(0,0,150,75);</script>

Try it Yourself »

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Step 1: Find the Canvas Element

First of all, you must find the <canvas> element.

This is done by using the HTML DOM method getElementById():

var canvas = document.getElementById("myCanvas");

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Step 2: Create a Drawing Object

Secondly, you need a drawing object for the canvas.

The getContext() is a built-in HTML object, with properties and methods for drawing:

var ctx = canvas.getContext("2d");

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Step 3: Draw on the Canvas

Finally, you can draw on the canvas.

Set the fill style of the drawing object to the color red:

ctx.fillStyle = "#FF0000";

The fillStyle property can be a CSS color, a gradient, or a pattern. The default fillStyle is black.

The fillRect(x,y,width,height) method draws a rectangle, filled with the fill style, on the canvas:

ctx.fillRect(0,0,150,75);