Small patch to fix IE11 issue

[lessonpix]

Hi folks, I realize this isn't a high-activity project, but I have been using it (with success) on Chrome on a project and had found it to be flaky on IE (event the latest version 11).

What I found was that IE was providing decimal (non-integer) X/Y coordinates in events on the Canvas and this was throwing off the "Find Index" code. so, here's a quick fix for that (it works on IE11)

`                // e: click event object
                // w: width of canvas element
                // offset: canvas selement offset object
                // returns canvas index
                var canvasIndexFromEvent = function(e,w,offset) {
                        var x = Math.floor(e.pageX) - parseInt(Math.floor(offset.left));
                        var y = Math.floor(e.pageY) - parseInt(Math.floor(offset.top));
                        return Math.floor((x + y * w) * 4);
                };

`

Notice all I did was "floor" the incoming x/y/top/left values and live was good again.

Let me know if this is helpful.

[scratchoo]

is this project still maintained ?