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#Twinkling Stars Effect

This is a simple script I wrote combining jQuery, Javascript, and some CSS3 Animations. I wanted this effect for my portfolio since it is space themed and I am quite pleased with how this came out! You can check out the script at this repository but I will go through it here:

    var populateSky = function(space){  
        var $space = $(space);
        var counter = 0;
        // This generates 150 stars varying from the three different types of stars 
        while (counter < 150){
            var star = Math.floor((Math.random() * 3) + 1);
            var xPos = ($space.width()/2.5) * Math.random();
            var yPos = $space.height() * Math.random();
            $('<div class="star star-type' + star + '"></div>').appendTo($space).css({
                "top" : yPos,
                "left" : xPos

It's a very simple algorithm for randomly generating stars, and their positions. Essentially we grab a div (the one with a class of "head-space") and inject all the random stars into it. What you don't see is in the CSS file I have three different kinds of stars. Here is one example:

        width: 1px;
        height: 1px;
        border-radius: 2px;
        -webkit-box-shadow: 0 0 1px 1px #A6B0D2;
                box-shadow: 0 0 1px 1px #A6B0D2;
        -webkit-animation: star1 3s ease-in-out infinite;
           -moz-animation: star1 3s ease-in-out infinite;
             -o-animation: star1 3s ease-in-out infinite;
                animation: star1 3s ease-in-out infinite;

This variable var star = Math.floor((Math.random() * 3) + 1); is responsible for randomly generating numbers 1-3. Each number correlates to CSS class '<div class="star star-type' + star + '"></div>' and you can see how they're being dynamically assigned. The stars are given a position of absolute so we can define their exact x and y coordinates, which are generated randomly: var xPos = ($space.width()/2.5) * Math.random(), var yPos = $space.height() * Math.random(); I divided the width by 2.5 to make the stars only appear within the image I used and I am sure I can refactor this code to accept the image width and height as the appropriate area to fill with stars, but cest' la' vie. On my portfolio I actually divide the height by a number because the photo the stars are appearing on includes land and sky. The final step is simply to give each star it's own x and y coordinates .appendTo($space).css({ "top" : yPos, "left" : xPos }); and it's done!

One final aesthetic I discovered was that by choosing a light color that is already present in the photo and making the stars that color as opposed to white, it creates a much more pleasing and realistic effect.

###Be sure to check out this specific experimentation at: <> or go to my portfolio to see it in action in a different way!


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