endless

[Spica2]

endless

[Spica2]

put after line 282 the callback this.callback(this);

then the callback is also fired at the end of rewind

[maxwellito]

Sorry about that, but you're right.
There's no callback when the animation is rewinded, only when it's drawn. I thought the callback would be useful only for when the SVG is drawn. But your point make sense.
I'll try to implement it for the next version, but I want to add a property on the object to check if the SVG is drawn or not (to help the callback). I'm also hesitating to add the callback as property in the option object.

Something like

new Vivus('logo', {}, function (myVivus) {
  myVivus.play(myVivus.isDrawn ? -1 : 1);
})

[Spica2]

This would give you more controll. But depends on where you wanto go with vivus and how complex it should get.
Btw.: An option for rewinding from start to end instead from end to start could also be nice.
line 322

path.el.style.strokeDashoffset = Math.floor(path.length * (0 - progress)); 

vs

path.el.style.strokeDashoffset = Math.floor(path.length * (1 - progress));

[maxwellito]

Now the callback function is called at the end of each animation. And to know if the instance is at the start or end, just check the property currentFrame (Equal to 0: start, else: end).