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transition-reversing-demo.html
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<!DOCTYPE HTML>
<title>Transition reversing demo</title>
<!-- L. David Baron <dbaron@dbaron.org>, 2013-06-07 -->
<style>
#demo {
background: blue;
width: 200px;
height: 1em;
padding: 2px;
}
#transitionable {
position: relative;
background: fuchsia;
width: 100px;
height: 1em;
pointer-events: none;
}
p.algRadio { margin: 0 }
</style>
<script>
var gDemo;
var gTransitionable;
function start()
{
var radios = document.getElementsByName("function");
for (var idx = 0; idx < radios.length; ++idx) {
var radio = radios[idx];
radio.addEventListener("change", refresh_tfs, false);
}
document.getElementsByName("x1")[0].addEventListener("change", refresh_tfs, false);
document.getElementsByName("y1")[0].addEventListener("change", refresh_tfs, false);
document.getElementsByName("x2")[0].addEventListener("change", refresh_tfs, false);
document.getElementsByName("y2")[0].addEventListener("change", refresh_tfs, false);
gDemo = document.getElementById("demo");
gDemo.addEventListener("mouseover", demo_mouseover, false);
gDemo.addEventListener("mouseout", demo_mouseout, false);
gTransitionable = document.getElementById("transitionable");
refresh_tfs();
var algs = document.getElementById("algorithms");
for (var alg in gAlgorithms) {
var radio = document.createElement("input");
radio.setAttribute("type", "radio");
radio.setAttribute("name", "algorithm");
radio.setAttribute("value", alg);
radio.addEventListener("change", refresh_algs, false);
var t = document.createTextNode(alg);
var label = document.createElement("label");
label.appendChild(radio);
label.appendChild(t);
var p = document.createElement("p");
p.className = "algRadio";
p.appendChild(label);
algs.appendChild(p);
}
document.getElementsByName("algorithm")[0].checked = true;
refresh_algs();
setInterval(tick, 20);
}
function tick()
{
var value = gCurrentAlgorithm.tick(Date.now());
//gTransitionable.style.left = Math.round(value) + "px";
var trans = "translateX(" + Math.round(value) + "px)";
gTransitionable.style.webkitTransform = trans;
gTransitionable.style.MozTransform = trans;
gTransitionable.style.msTransform = trans;
gTransitionable.style.OTransform = trans;
gTransitionable.style.transform = trans;
}
function refresh_algs(event)
{
var alg = "";
var radios = document.getElementsByName("algorithm");
for (var idx = 0; idx < radios.length; ++idx) {
var radio = radios[idx];
if (radio.checked) {
alg = radio.value;
}
}
gCurrentAlgorithm = gAlgorithms[alg];
gCurrentAlgorithm.construct();
}
var gDuration = 4000; // ms
var gAlgorithmData = null;
var gCurrentAlgorithm;
var gAlgorithms = {
"No Reversing Adjustment": {
construct: function() {
gAlgorithmData = {
current:0,
starttime: Date.now(),
startpos: 0,
endpos: 0,
};
},
over: function() {
var now = Date.now();
gAlgorithmData.startpos = this.tick(now);
gAlgorithmData.endpos = 100;
gAlgorithmData.starttime = now;
},
out: function() {
var now = Date.now();
gAlgorithmData.startpos = this.tick(now);
gAlgorithmData.endpos = 0;
gAlgorithmData.starttime = now;
},
tick: function(t) {
var time_portion = clamp((t - gAlgorithmData.starttime) / gDuration);
var value_portion = gCurrentTF(time_portion);
return value_portion * gAlgorithmData.endpos + (1 - value_portion) * gAlgorithmData.startpos;
},
},
"2013-06-07 spec text on reversing (Apple proposal)": {
construct: function() {
gAlgorithmData = {
current:0,
starttime: Date.now(),
startpos: 0,
endpos: 0,
reverse_tf: false,
};
},
over: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.reverse_tf = false;
gAlgorithmData.starttime = now;
} else {
gAlgorithmData.reverse_tf = !gAlgorithmData.reverse_tf;
gAlgorithmData.starttime = now - ((gAlgorithmData.starttime + gDuration) - now);
}
gAlgorithmData.startpos = 0;
gAlgorithmData.endpos = 100;
},
out: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.reverse_tf = false;
gAlgorithmData.starttime = now;
} else {
gAlgorithmData.reverse_tf = !gAlgorithmData.reverse_tf;
gAlgorithmData.starttime = now - ((gAlgorithmData.starttime + gDuration) - now);
}
gAlgorithmData.startpos = 100;
gAlgorithmData.endpos = 0;
},
tick: function(t) {
var time_portion = clamp((t - gAlgorithmData.starttime) / gDuration);
if (gAlgorithmData.reverse_tf) {
time_portion = 1.0 - time_portion;
}
var value_portion = gCurrentTF(time_portion);
if (gAlgorithmData.reverse_tf) {
value_portion = 1.0 - value_portion;
}
return value_portion * gAlgorithmData.endpos + (1 - value_portion) * gAlgorithmData.startpos;
},
},
"dbaron proposal (implemented in Gecko)": {
construct: function() {
gAlgorithmData = {
current:0,
starttime: Date.now(),
startpos: 0,
endpos: 0,
duration: gDuration,
};
},
over: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.duration = gDuration;
} else {
gAlgorithmData.duration = gDuration * Math.abs(curpos - gAlgorithmData.startpos) / 100;
}
gAlgorithmData.startpos = curpos;
gAlgorithmData.endpos = 100;
gAlgorithmData.starttime = now;
},
out: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.duration = gDuration;
} else {
gAlgorithmData.duration = gDuration * Math.abs(curpos - gAlgorithmData.startpos) / 100;
}
gAlgorithmData.startpos = curpos;
gAlgorithmData.endpos = 0;
gAlgorithmData.starttime = now;
},
tick: function(t) {
var time_portion = clamp((t - gAlgorithmData.starttime) / gAlgorithmData.duration);
var value_portion = gCurrentTF(time_portion);
return value_portion * gAlgorithmData.endpos + (1 - value_portion) * gAlgorithmData.startpos;
},
},
"plinss proposal (jump to current point on reverse curve)": {
construct: function() {
gAlgorithmData = {
current:0,
starttime: Date.now(),
startpos: 0,
endpos: 0,
};
},
over: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.starttime = now;
} else {
var time_portion = gCurrentInverseTF(1.0 - gCurrentTF(this.time_portion(now)))
gAlgorithmData.starttime = now - time_portion * gDuration;
}
gAlgorithmData.startpos = 0;
gAlgorithmData.endpos = 100;
},
out: function() {
var now = Date.now();
var curpos = this.tick(now);
if (curpos == gAlgorithmData.endpos) {
gAlgorithmData.starttime = now;
} else {
var time_portion = gCurrentInverseTF(1.0 - gCurrentTF(this.time_portion(now)))
gAlgorithmData.starttime = now - time_portion * gDuration;
}
gAlgorithmData.startpos = 100;
gAlgorithmData.endpos = 0;
},
time_portion: function(t) {
return clamp((t - gAlgorithmData.starttime) / gDuration);
},
tick: function(t) {
var value_portion = gCurrentTF(this.time_portion(t));
return value_portion * gAlgorithmData.endpos + (1 - value_portion) * gAlgorithmData.startpos;
},
},
"vhardy proposal (accumulation) (NOT YET IMPLEMENTED)": {
},
}
function demo_mouseover(event)
{
if (event.target != gDemo) {
return;
}
gCurrentAlgorithm.over();
}
function demo_mouseout(event)
{
if (event.target != gDemo) {
return;
}
gCurrentAlgorithm.out();
}
function clamp(v)
{
if (v < 0) return 0;
if (v > 1) return 1;
return v;
}
var gCurrentTF;
var gCurrentInverseTF;
var gX1, gY1, gX2, gY2;
var gCurrentInput, gCurrentOutput;
function refresh_tfs()
{
var func = "";
var radios = document.getElementsByName("function");
for (var idx = 0; idx < radios.length; ++idx) {
var radio = radios[idx];
if (radio.checked) {
func = radio.value;
}
}
var x1o = document.getElementById("x1");
var y1o = document.getElementById("y1");
var x2o = document.getElementById("x2");
var y2o = document.getElementById("y2");
x1o.value = "";
y1o.value = "";
x2o.value = "";
y2o.value = "";
var x1, y1, x2, y2;
switch (func) {
case "ease":
x1 = 0.25; y1 = 0.10; x2 = 0.25; y2 = 1.00;
break;
case "linear":
x1 = 0.00; y1 = 0.00; x2 = 1.00; y2 = 1.00;
break;
case "ease-in":
x1 = 0.42; y1 = 0.00; x2 = 1.00; y2 = 1.00;
break;
case "ease-out":
x1 = 0.00; y1 = 0.00; x2 = 0.58; y2 = 1.00;
break;
case "ease-in-out":
x1 = 0.42; y1 = 0.00; x2 = 0.58; y2 = 1.00;
break;
case "cubic-bezier":
x1 = clamp(Number(document.getElementsByName("x1")[0].value));
y1 = Number(document.getElementsByName("y1")[0].value);
x2 = clamp(Number(document.getElementsByName("x2")[0].value));
y2 = Number(document.getElementsByName("y2")[0].value);
break;
default:
return;
}
x1o.innerHTML = x1.toFixed(2);
y1o.innerHTML = y1.toFixed(2);
x2o.innerHTML = x2.toFixed(2);
y2o.innerHTML = y2.toFixed(2);
var tf = bezier(x1, y1, x2, y2);
gX1 = x1; gY1 = y1; gX2 = x2; gY2 = y2;
gCurrentTF = tf;
gCurrentInverseTF = bezier(y1, x1, y2, x2);
}
function bezier(x1, y1, x2, y2) {
// Cubic bezier with control points (0, 0), (x1, y1), (x2, y2), and (1, 1).
function x_for_t(t) {
var omt = 1-t;
return 3 * omt * omt * t * x1 + 3 * omt * t * t * x2 + t * t * t;
}
function y_for_t(t) {
var omt = 1-t;
return 3 * omt * omt * t * y1 + 3 * omt * t * t * y2 + t * t * t;
}
function t_for_x(x) {
// Binary subdivision.
var mint = 0, maxt = 1;
for (var i = 0; i < 30; ++i) {
var guesst = (mint + maxt) / 2;
var guessx = x_for_t(guesst);
if (x < guessx)
maxt = guesst;
else
mint = guesst;
}
return (mint + maxt) / 2;
}
return function bezier_closure(x) {
if (x == 0) return 0;
if (x == 1) return 1;
return y_for_t(t_for_x(x));
}
}
</script>
<body onload="start()">
<p>Choose a timing function:<br>
<label><input type="radio" name="function" value="ease" checked>ease</label>
<label><input type="radio" name="function" value="linear">linear</label>
<label><input type="radio" name="function" value="ease-in">ease-in</label>
<label><input type="radio" name="function" value="ease-out">ease-out</label>
<label><input type="radio" name="function" value="ease-in-out">ease-in-out</label>
<label><input type="radio" name="function" value="cubic-bezier" id="cbez">cubic-bezier</label>(<input type="text" size="4" name="x1" value="0.25">, <input type="text" size="4" name="y1" value="0">, <input type="text" size="4" name="x2" value="0.75">, <input type="text" size="4" name="y2" value="1">)
</p>
<p>Cubic bezier curve with control points: (0, 0) →
(<span id="x1"></span>, <span id="y1"></span>) →
(<span id="x2"></span>, <span id="y2"></span>) →
(1, 1). This function maps time to value.</p>
<div id="algorithms">
</div>
<p>Hover over the outer box:</p>
<div id="demo">
<div id="transitionable"></div>
</div>