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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <html lang="en">
    
<head>
  <meta charset="utf-8">
</head>
    
<body>

<div class="wrapper">  
   
 <p>circle.timeline = </p>
    
    <textarea id="input_field" oninput="setTimelineInput(this.value)" onchange="setTimelineInput(this.value)">
[{"key":0   , "x": 0  , "y":0   },
 {"key":0.20, "x": 100, "y":100 },
 {"key":0.40, "x": 200, "y":0   },
 {"key":0.60, "x": 300, "y":200 },
 {"key":0.80, "x": 300, "y":100 },
 {"key":1.00, "x": 200, "y":100}]
    </textarea> 

    <div class="box">
        <div id="circle"><span></span></div>
    </div>
    
    <p id="output_field">0</p>
    
    <input id="range" type="range" min="0" max="1000" value="0" oninput="update(this.value)" onchange="update(this.value)">

</div> 
    
</body>
</html>
            
          
!
            
              body{
    background-color:#fff;
    margin:0;
    padding:0;
}

.wrapper{
    font-family:"Tahoma";
    max-width:300px;
    margin:0 auto;
    padding:30px 5px 30px 5px;
}
p{
    margin:5px 0 5px 0;
    font-size:14px;
}
textarea{
    width:100%;
    padding:5px;
    box-sizing: border-box;
    min-height:140px;
    line-height:16px;
    border:1px solid #ccc;
    border-radius:3px;
    background-color:#f4f4f4;
    margin-bottom:10px;
}

.box{
    width:100%;
    height:200px;
    background-image:url(https://www.isotopic.com.br/wordpress/wp-content/uploads/2015/11/zIYXCZv.png);
    background-repeat:no-repeat;
    margin:0 auto;
}

#circle{
    width:10px;height:10px;
    transform:translate(0px,0px);
}
#circle span{
    display:block;
    width:10px;height:10px;
    border-radius:50%;
    border:4px solid #6699EE;
    background-color:#fff;
    transform:translate(-8px,-8px);
}
#range{
    width:90%;
    display:block;
    margin: 0 auto;
}

#output_field{
    text-align:center;
}
            
          
!
            
              /**
* Author: isotopic.com.br
* Scroll based animation following a 'keyframed timeline' approach.
* All animation keyframes are stored in a json file.
* Movement is triggered by any continuous input (like scroll, slider, etc).
* In a real use case it'd have a lot more verifications. This is just to show the concept.
*/

// Sample object to be animated
var circle = document.getElementById("circle");
circle.timeline = {};

// Input
var input_field = document.getElementById("input_field");

// Output
var output_field = document.getElementById("output_field");

// In this example, json data comes from the input field
function setTimelineInput(json_data){ 
   circle.timeline = JSON.parse(json_data);
}
setTimelineInput(input_field.value);

// In this example, update is fired by the slider event - usually it'd be triggered by scrolling the page.
function update(range_value){

    // 'ratio' corresponds to the animation state, from 0 (start) to 1 (end).
    var ratio = range_value / 1000;
    var keyframes = [];
    var local_ratio = 0;
    output_field.innerHTML = ratio;
    
    // Loop through all keyframes available for this object
    for(i=0;i<circle.timeline.length-1;i++){

        // When ratio's value is between two keyframes, it must affect the object's properties
        if(ratio >= circle.timeline[i].key && ratio <= circle.timeline[i+1].key){
            keyframes[0] = circle.timeline[i];
            keyframes[1] = circle.timeline[i+1];
        }
        
        if(keyframes.length==2){

            // Normalizes the global ratio to a local ratio (the ratio between two keyframes)
            local_ratio = (ratio - keyframes[0].key) / (keyframes[1].key - keyframes[0].key);
            
            // A little easing
            local_ratio = easeInOutQuad(local_ratio);

            // The calculated position will be the initial position, plus the percent of the possible variation between frames
            x = (keyframes[0].x + local_ratio*(keyframes[1].x -
            keyframes[0].x)); y = (keyframes[0].y + local_ratio*(keyframes[1].y
            - keyframes[0].y));

            // What a mess
            circle.style['-webkit-transform'] = "translate( "+x+"px, "+y+"px)";
            circle.style['-ms-transform']     = "translate( "+x+"px, "+y+"px)";
            circle.style['transform']         = "translate( "+x+"px, "+y+"px)";

        }
        
    }
    
}


//Robert Penner's simplified to just one input
function easeInOutQuad(t) {
    t *= 2;
    if (t < 1) return t*t /2;
    t--;
    return - ( t*(t-2) - 1 ) /2;
}
            
          
!
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