javascript - HTML5 Canvas with rounded corner

Question

I'd like to have an HTML5 canvas with rounded corner. I'm using the CSS property border-radius: 15px to round my corners.

But, when I draw something in the corner of my canvas, I can draw in the corner.

At the beginning:

What I have:

What I want:

Do you have any solution to avoid that? I thought about create a mask but I don't really know how to do.. For information, this works on Firefox but not on Chrome/Safari/Opera.

This is a small example:

http://jsfiddle.net/XYHpJ/

Thanks!

Answer 1

Just use this example on stackoverflow: https://stackoverflow.com/a/12336233/1312570

Solution: http://jsfiddle.net/rzSmw/

#canvas_container
{
    background: #fff;
    border: 1px solid #aaa;
    border-radius: 15px;
    height: 515px;
    margin: 20px 20px;
    overflow: hidden;
    width: 690px;

    /* this fixes the overflow:hidden in Chrome/Opera */
    -webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);
}