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Control img's border perimeter by time countdown - from full circle, through partial arc, to nothing

I use html, css, angularjs in the front.
I've got an img which in the initial state is surrounded with a full circle of a thick border. I start a countdown of a minute. I would like the border to get partially disappeared as the time goes down.
For example, after the first second only 59/60 of the perimeter of the border is shown, after the second one only 58/60 is shown, ..., after 30 seconds there's only a half of a circle and so on, until it gets totally disappeared.
In addition, if it's possible, I would like the transitions to be smooth.
Thanks for any help

You have to use a combination of ng-class for conditionnal CSS on your case AND css transition.
See for example this example of a smooth transition that is for a 5s for an element to be half visible
#myTransition {
opacity: .5;
transition: opacity .5s ease-out;
-moz-transition: opacity .5s ease-out;
-webkit-transition: opacity .5s ease-out;
-o-transition: opacity .5s ease-out;
}

CSS transition on data-percentage attribute change

I have found a code that makes a Circular progress bar, and changed it a bit to grow on click from 1 to other number. Later on I wanted to add transition but it doesn't seem to work, the progress bar changes without transition
-moz-transition: all 1s ease-in-out;
-webkit-transition: all 1s ease-in-out;
-o-transition: all 1s ease-in-out;
transition: all 1s ease-in-out;
http://jsfiddle.net/Aapn8/8362/
Someone have an idea how to make transition work?

As #user1850903 wrote - transition doesn't work in that way.
You can use setInterval() to get the effect you want:
http://jsfiddle.net/3j0vxx77/17/

your drawCircle funciton uses canvas and is not influenced by CSS.
CSS only applies to html tags, not to lines drown on canvas.
Quote from WIKI: "Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language"
https://en.wikipedia.org/wiki/Cascading_Style_Sheets

Keep a CSS property until the transition of the other ends

I use the after pseudo-element to simulate a gradient transition, but my gradients can be different, so I created a class for each one of them and applied them with JS when I needed them. Of course in the general ::after I specify transition: opacity 1s; and in each one of the gradient classes I have a background and opacity: 1;. Now I stumbled upon a problem, I need to reverse the transition, but that wasn't so easy, because (since I use JS), I am removing the class, which means that the opacity transition will of course still run, but the background gets deleted immediately. How can I keep the background until the opacity transition ends?
JSFiddle: http://jsfiddle.net/5c7xfwLw/

I updated your fiddle:
http://jsfiddle.net/5c7xfwLw/1/
Because you are fading out you don't need to remove the background, like this you can do simply the opacity animation.
.green:after {
background: -webkit-linear-gradient(#53FF40, transparent 50%);
}
.fade-after::after {
opacity: 1;
}

Combining users' scroll + animation css3/Javascript

First post on SO so far :)
I'm creating a parallax website combining css3 + javascript.
I followed this tutorial and I have to say that it gave me quite a grasp on the subject.
I was just wondering 2 things:
How do I translate the movement on the X axis?
Most Important: How can i combine users' scrolling with animations?
I've seen there is plenty of plugins out there, but I'd rather develop a solution myself without getting the code too heavy and complicated. Could you point me out some good resource, which will enlighten me on this technique?
Thank you guys!
EDITED on 17/09/12 at 14.14 (+1 GTM TIME)
In case someone would be interested, that should be the idea-code by which we would do the trick:
$(document).ready(function() {
$('section[data-type="example"]').scroll(function() {
// If the user scroll as much as we need, in this instance 750px
if (scrollTop() > '750px') {
// switch its class from ".animation" to ".animated"
$(".animation").toggleClass("animated");
}
});
});
CSS Classes would be:
.animation {
width: 300px;
height: 300px:
-webkit-transition: width 2s ease, height 2s ease;
-moz-transition: width 2s ease, height 2s ease;
-o-transition: width 2s ease, height 2s ease;
-ms-transition: width 2s ease, height 2s ease; transition: width 2s ease, height 2s ease; }
.animated { width: 400px; height: 400px; }
As we see, in ".animation" we would find the initial size and the animation, and in ".animated" we're going to print what we want to achieve.
This has been created thanks to the hints provided by #jfriend00. Unfortunately I havn't had the possibility to try it yet, so feel free to improve it. I wrote it here because it seems like someone is interested to this topic, and previously I posted it in a comment making it unreadable :)
Also, Jfriend00 told that .scrollTop() is a JQuery Method, not a plain function. How do you think it could be improved using plain JS?
Thanks in advance and sorry for my grammar error and for the noobness; I'm not English Native and I'm quite new with programming :)

From your comment:
Let's say that for example, I want to combine the users' scroll to a
transitional effect. So i.e. once the user has scrolled 750px, I want
an object to appear with a fade transition. How do I link the
scrolling factor with the animation?
This is one way to approach that specific example:
You would register an event listener for the scroll event.
In the scroll event handler, you would examine the current scroll position and decide if you wanted to take action (e.g. scrollTop is more than 750px).
The easiest way to trigger a CSS3 animation is to add a class name to your object. If the object has CSS assigned to it for that new class and the object is configured for CSS transitions on any of the properties that are changed by adding the class name to the object, then a CSS3 animation will start when the class is added.

I need to find prototype.js based slide out tab?

I have founded this -> http://www.building58.com/examples/tabSlideOut.html
But there are some reasons that i dont want to use it:
i need prototype framework instead of jquery
i need an image to open slider (click to open) and when it opened image will change to "click to close"
Maybe someone has already the same solution of my question?
thank for you help!

CSS transitions were made for this sort of thing! For a demonstration of what you're looking for see http://jsfiddle.net/Fw7MQ/ (The 'handle' changes background colour but you could easily make that a background image instead)
The crucial parts of CSS are;
#drawer {
position: relative;
left: -200px;
/* transition is repeated for all supporting browsers */
-webkit-transition: left 0.5s ease-in-out;
-moz-transition: left 0.5s ease-in-out;
-o-transition: left 0.5s ease-in-out;
-ms-transition: left 0.5s ease-in-out;
transition: left 0.5s ease-in-out;
}
#drawer.open {
left: 0;
}
The 'drawer' has a class name added or removed as necessary using this tiny javascript snippet;
Event.observe('handle', 'click', Element.toggleClassName.curry('drawer', 'open'))
...but you could dispense with even that if the animation was done on mouseover instead - change the CSS selector from #drawer.open to #drawer:hover.
For older browsers it degrades gracefully, the animation doesn't play but the drawer still appears in the right place.