Love ALL The Web

update no selection problems anymore ... eat the cake now

Maybe 'cause San Valentine is coming, maybe 'cause Chris Williams started it, promoting an end to negativity, or maybe 'cause the web has been recently under attack ... no matter why, the topic of this js1k contest is Love so here I am introducing my proposal, the very first demo submitted this year.
Click the link once to see it in action through following iframe:

What Is It

A simple script able to bring random harts behind the mouse or the finger in any page you want, even Facebook :)
In order to do this, you can bookmark the link dragging into your bookmark bar, change the name (i.e. LOVE), and start surfing surrounded by little harts any new page you visit by simply clicking it. I know it's a silly demo, but it was a quick and interesting experiment I could recycle with any sort of different shape since the graphic is directly drawn on every little canvas.

Technical Details

• compatible with all modern mobile and desktop browsers, included IE9
• unobtrusive, it should not affect much the normal behavior of the generic page
• based on requestAnimationFrame where supported
• lazy pointer evaluation, no matter if your tablet is attached to a deck with a mousepad, touch screens and other pointers are all supported at runtime
• it fits in 1020 1023 bytes after Closure Compiler Advanced minification plus extra clean up performed by YUI Compressor (plus few manual tweaks for numbers) ... once gzipped, it fits in about 0.5Kb
• 1 hour of work, included mobile and cross browsers tests ( plus 20 minutes to think about a solution and fix the text selection problem )
• easy to recycle, a single change in the draw function and anything you want could be displayed, even smoke effect or rainbows

Discoveries During Creation

• performances boost with requestAnimationFrame is unbelievable, if you compare current Opera browser VS Chrome, Safari, Webkit, or Firefox, you'll see the difference against setTimeout
• IE9 and IE10 awesome canvas performances become crap once more than a canvas is created at runtime. If you see how slow this thing could be in my Netbook in IE compared to others, you'll rethink about how fast canvases are in MS browser: it is that fast, but only if there is one of them
• Opera still doesn't support requestAnimationFrame even if prefixed with the little o
• the canvas arc() method is completely freak, only few browsers give what you expect. Compare the bigger hart on click in Chrome and Firefox, as example, Chrome gonna show Mickey Mouse like hart
• YUI Compressor after Google Closure Compiler Advanced is able to produce a slightly smaller output preserving functionality
• Chrome DOM inspector is really smart. While Safari and Webkit becomes much slower during inspection, Chrome seems to use a "requestDOMInspection" like mechanism to do not slow down the page during DOM changes

Have fun with JS1K