Reversable scrolling

[tylerecouture]

Thank you for this plugin! Can I request reversable scrolling? For example one scroll click up then one scroll click down returns you to the original zoom (1:1). This might make for a more intuitive default also.

Also, my chart is on a large page and scrolling caused the page to also scroll, this worked beautifully to prevent that:
http://stackoverflow.com/questions/1459676/prevent-scroll-bubbling-from-element-to-window#answer-4593315.

[courchef]

Thanks for the tip on page scrolling. I have the same issue.

I modified the wheel handler in Chart.Zoom.js at line 195 (as of version 0.1.3) with the following lines:

var wheelHandler = function(e) {
    e.preventDefault();
    if (e.deltaY < 0) {
        doZoom(chartInstance, 1.1);
    } else {
        doZoom(chartInstance, 0.909);
    }
};

It prevents a long page from scrolling when the mouse wheel is activated over the chart.

Is it possible to add this in master branch?

[etimberg]

@courchef i'm happy to merge a PR for this

[etimberg]

Fixed in #24