Fill image with a repeatable texture
Would it be possible to fill a png with transparency with a pattern (a repeatable texture)?
Here's a quick example of loading an image onto the canvas, just not sure how to fill it with a pattern, if that isn't possible then would there be a way to extract a path from the png?
<script>
va开发者_高级运维r c = document.getElementById("a");
var ctx = c.getContext("2d");
var test= new Image();
test.src = "images/test.png";
test.onload = function() {
ctx.drawImage(test, 0, 0);
};
</script>
<body>
<canvas id="a"></canvas>
</body>
I've also created a jsfiddle with an actual loaded png
This is the effect I'm looking to achieve
Update
working example based on Simon Sarris' answer http://jsfiddle.net/sergeh/G8egW/6/
First, draw the image to Canvas.
Then do globalCompositeOperation = 'source-in';
Then draw the pattern. It will only exist where the image was.
http://jsfiddle.net/G8egW/2/
If you had stuff already on the canvas before this time, you'll need to do the above operations on an in-memory canvas and then draw that canvas to your normal canvas. Like this:
http://jsfiddle.net/G8egW/5/
(notice the difference in the grid)
加载中,请稍侯......
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