Patterns (the createPattern function)

Share RGraph:   
[No canvas support]

Patterns can be created to make self-repeating fills/strokes instead of using a standard color or gradient. You can use an image as the source, or a video, or another canvas. The example to the right shows creating a pattern and then covering the canvas with it. In this way you could create realistic repeating images (eg of water or sand) from just one small image.

You don't have to use an image - other options include video and other canvas tags. This allows to draw a pattern on one canvas and then have that repeated as a background on another tag. Alternatively you could create a pattern out of a video (that plays in the background).

Arguments to the function

An example

<script>
    window.onload = function ()
    {
        var canvas = document.getElementById('cvs');
        var context = canvas.getContext('2d');

        var image = new Image();
        image.src = '/images/logo.png';
        image.onload = function ()
        {
            var pattern = context.createPattern(image, 'repeat');
            context.fillStyle = pattern;
            context.fillRect(0, 0, 600, 250);
        }
    }
</script>

Comments

Add a new comment...