Changing a CSS Animation at its Current Values

Developer
Zach Saucier
Size
3,781 Kb
Views
30,360
  1. Changing a CSS Animation at its Current Values Previews
  2. Changing a CSS Animation at its Current Values HTML Codes
  3. Changing a CSS Animation at its Current Values CSS Codes
  4. Changing a CSS Animation at its Current Values JS Codes

How do I make an changing a css animation at its current values?

Made as an experiment to try and change a CSS animation using its current values to a new animation and demonstrate the technique of doing so. What is a changing a css animation at its current values? How do you make a changing a css animation at its current values? This script and codes were developed by Zach Saucier on 20 August 2022, Saturday.

Changing a CSS Animation at its Current Values Previews
IQ Test

Changing a CSS Animation at its Current Values - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Changing a CSS Animation at its Current Values</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <!-- NOTE: This example only works in Webkit Browsers -->
<div id="circle"></div>
<div id='button'>ChangeAnimation</div>
<div id='result'></div> <script src="js/index.js"></script>
</body>
</html>

Changing a CSS Animation at its Current Values - Script Codes CSS Codes

@-webkit-keyframes rotate { 0% { -webkit-transform:translate(100px, 100px) rotate(0deg) translate(-100px, -100px) rotate(0deg); background-color:red; } 13% { -webkit-transform:translate(100px, 100px) rotate(45deg) translate(-100px, -100px) rotate(-45deg); } 25% { -webkit-transform:translate(100px, 100px) rotate(90deg) translate(-100px, -100px) rotate(-90deg); } 38% { -webkit-transform:translate(100px, 100px) rotate(135deg) translate(-100px, -100px) rotate(0deg); } 50% { -webkit-transform:translate(100px, 100px) rotate(180deg) translate(-100px, -100px) rotate(-180deg); } 63% { -webkit-transform:translate(100px, 100px) rotate(225deg) translate(-100px, -100px) rotate(225deg); } 75% { -webkit-transform:translate(100px, 100px) rotate(270deg) translate(-100px, -100px) rotate(-270deg); } 88% { -webkit-transform:translate(100px, 100px) rotate(315deg) translate(-100px, -100px) rotate(315deg); } 100% { -webkit-transform:translate(100px, 100px) rotate(360deg) translate(-100px, -100px) rotate(-360deg); }
}
#circle { height: 50px; width: 50px; border-radius:25px; background-color: teal; -webkit-animation-duration: 4s; -webkit-animation-timing-function: linear; -webkit-animation-name:"rotate"; -webkit-animation-iteration-count: infinite; position:absolute; left:30%; top:20%;
}
#button { width:130px; background:teal;
}

Changing a CSS Animation at its Current Values - Script Codes JS Codes

// NOTE: The change to red signifies the start of
// the animation
// Allows elements to be accessed in a clean way
var circle = document.getElementById('circle'), button = document.getElementById('button'); // Gets element to show current percentage
var result = document.getElementById('result'), // Current position of circle around its path // in percent in reference to the original totalCurrentPercent = 0, // Percent of circle around its path in // percent in reference to the latest origin currentPercent = 0;
// Updates the percent change from the latest origin
var showPercent = window.setInterval(function() { if(currentPercent < 100) { currentPercent += 1; } else { currentPercent = 0; } result.innerHTML = currentPercent;
}, 39); // Runs at a rate based on the animation's // duration (milliseconds / 100)
// Checks to see if the specified rule is within
// any of the stylesheets found in the document;
// returns the animation object if so
function findKeyframesRule(rule) { var ss = document.styleSheets; for (var i = 0; i < ss.length; ++i) { for (var j = 0; j < ss[i].cssRules.length; ++j) { if (ss[i].cssRules[j].type == window.CSSRule.WEBKIT_KEYFRAMES_RULE && ss[i].cssRules[j].name == rule) { return ss[i].cssRules[j]; } } } return null;
}
// Replaces the animation based on the percent
// when activated and other hard coded
// specifications
function change(anim) { // Obtains the animation object of the specified // animation var keyframes = findKeyframesRule(anim), length = keyframes.cssRules.length; // Makes an array of the current percent values // in the animation var keyframeString = []; for(var i = 0; i < length; i ++) { keyframeString.push(keyframes[i].keyText); } // Removes all the % values from the array so // the getClosest function can perform calculations var keys = keyframeString.map(function(str) { return str.replace('%', ''); }); // Updates the current position of the circle to // be used in the calculations totalCurrentPercent += currentPercent; if(totalCurrentPercent > 100) { totalCurrentPercent -= 100; } // Self explanatory variables if you read the // description of getClosest var closest = getClosest(keys); var position = keys.indexOf(closest), firstPercent = keys[position]; // Removes the current rules of the specified // animation for(var i = 0, j = keyframeString.length; i < j; i ++) { keyframes.deleteRule(keyframeString[i]); } // Turns the percent when activated into the // corresponding degree of a circle var multiplier = firstPercent * 3.6; // Essentially this creates the rules to set a new // origin for the path based on the approximated // percent of the animation when activated and // increases the diameter of the new circular path keyframes.insertRule("0% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 0) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 0) + "deg); background-color:red; }"); keyframes.insertRule("13% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 45) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 45) + "deg); }"); keyframes.insertRule("25% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 90) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 90) + "deg); }"); keyframes.insertRule("38% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 135) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 135) + "deg); }"); keyframes.insertRule("50% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 180) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 180) + "deg); }"); keyframes.insertRule("63% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 225) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 225) + "deg); }"); keyframes.insertRule("75% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 270) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 270) + "deg); }"); keyframes.insertRule("88% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 315) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 315) + "deg); }"); keyframes.insertRule("100% { -webkit-transform: translate(100px,100px) rotate(" + (multiplier + 360) + "deg) translate(-100px,-100px) rotate(" + (multiplier + 360) + "deg); }"); // Shows the circle again circle.style.display = "inherit"; // Sets the animation to the newly specified rules circle.style.webkitAnimationName = anim; // Resets the approximate animation percent counter window.clearInterval(showPercent); currentPercent = 0; showPercent = self.setInterval(function() { if(currentPercent < 100) { currentPercent += 1; } else { currentPercent = 0; } result.innerHTML = currentPercent; }, 39);
}
// Attatches the change function to the button's
// onclick function
button.onclick = function() { // Removes the animation so a new one can be set circle.style.webkitAnimationName = "none"; // Temporarily hides the circle circle.style.display = "none"; // Initializes change function setTimeout(function () { change("rotate"); }, 0);
}
// Gets the animation's closest % value based on
// the approximated % found below
function getClosest(keyframe) { var curr = keyframe[0]; var diff = Math.abs (totalCurrentPercent - curr); for (var val = 0, j = keyframe.length; val < j; val++) { var newdiff = Math.abs(totalCurrentPercent - keyframe[val]); if (newdiff < diff) { diff = newdiff; curr = keyframe[val]; } } return curr;
}
// Check out http://zachsaucier.com/ for more of my projects
Changing a CSS Animation at its Current Values - Script Codes
Changing a CSS Animation at its Current Values - Script Codes
Home Page Home
Developer Zach Saucier
Username Zeaklous
Uploaded August 20, 2022
Rating 3.5
Size 3,781 Kb
Views 30,360
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