Canvas Context
In this chapter you will learn:
Getting a Canvas Context
The context object from canvas element exposes drawing functions.
HTMLCanvasElement represents the canvas element in the DOM.
We can use HTMLCanvasElement to get the context.
The HTMLCanvasElement object:
| Member | Description | Returns |
|---|---|---|
| height | Corresponds to the height attribute | number |
| width | Corresponds to the width attribute | number |
| getContext(context) | Returns a drawing context for the canvas | object |
To get the two-dimensional context object, we request pass the 2d argument to getContext(context).
<!DOCTYPE HTML><!--from jav a2s . c o m-->
<html>
<head>
<style>
canvas {
border: medium double black;
margin: 4px
}
</style>
</head>
<body>
<canvas id="canvas" width="500" height="100">
Your browser doesn't support the <code>canvas</code> element
</canvas>
<script>
var ctx = document.getElementById("canvas").getContext("2d");
ctx.fillRect(10, 10, 50, 50);
</script>
</body>
</html>
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What you will learn in the next chapter:
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