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<title>[202665] trunk/Websites/webkit.org</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/202665">202665</a></dd>
<dt>Author</dt> <dd>dino@apple.com</dd>
<dt>Date</dt> <dd>2016-06-29 21:17:33 -0700 (Wed, 29 Jun 2016)</dd>
</dl>
<h3>Log Message</h3>
<pre>Demo and JS implementation of our spring() animation
timing function.
* demos/spring/index.html: Added.
* demos/spring/spring.js: Added.
(SpringSolver):
(SpringSolver.prototype.solve):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkWebsiteswebkitorgChangeLog">trunk/Websites/webkit.org/ChangeLog</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li>trunk/Websites/webkit.org/demos/spring/</li>
<li><a href="#trunkWebsiteswebkitorgdemosspringindexhtml">trunk/Websites/webkit.org/demos/spring/index.html</a></li>
<li><a href="#trunkWebsiteswebkitorgdemosspringspringjs">trunk/Websites/webkit.org/demos/spring/spring.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkWebsiteswebkitorgChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Websites/webkit.org/ChangeLog (202664 => 202665)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Websites/webkit.org/ChangeLog 2016-06-30 03:55:34 UTC (rev 202664)
+++ trunk/Websites/webkit.org/ChangeLog 2016-06-30 04:17:33 UTC (rev 202665)
</span><span class="lines">@@ -1,5 +1,15 @@
</span><span class="cx"> 2016-06-29 Dean Jackson <dino@apple.com>
</span><span class="cx">
</span><ins>+ Demo and JS implementation of our spring() animation
+ timing function.
+
+ * demos/spring/index.html: Added.
+ * demos/spring/spring.js: Added.
+ (SpringSolver):
+ (SpringSolver.prototype.solve):
+
+2016-06-29 Dean Jackson <dino@apple.com>
+
</ins><span class="cx"> Small change to wording, and link to the interactive version.
</span><span class="cx">
</span><span class="cx"> * blog-files/color-gamut/index.html:
</span></span></pre></div>
<a id="trunkWebsiteswebkitorgdemosspringindexhtml"></a>
<div class="addfile"><h4>Added: trunk/Websites/webkit.org/demos/spring/index.html (0 => 202665)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Websites/webkit.org/demos/spring/index.html (rev 0)
+++ trunk/Websites/webkit.org/demos/spring/index.html 2016-06-30 04:17:33 UTC (rev 202665)
</span><span class="lines">@@ -0,0 +1,159 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>Spring timing function demo</title>
+<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro" rel="stylesheet">
+<style>
+
+body {
+ background-color: #CECECE;
+ font-family: "Source Sans Pro", sans-serif;
+ color: #5E275A;
+}
+
+h1 {
+ font-size: 200%;
+ color: #5E275A;
+ border-bottom: 1px solid #888;
+ width: 500px;
+ margin-top: 0;
+}
+
+p {
+ width: 500px;
+}
+
+#canvas {
+ position: absolute;
+ top: 0;
+ left: 0;
+ width: 100vw;
+ height: 100vh;
+ z-index: -1;
+}
+
+#object {
+ position: absolute;
+ left: -20px;
+ top: -20px;
+ width: 40px;
+ height: 40px;
+ border-radius: 20px;
+ box-sizing: border-box;
+ border: 2px solid #6F6F6F;
+ background-color: #6E9FB7;
+ transform: translate(100px, 200px);
+ will-change: transform;
+}
+
+.useSystem #object {
+ transition-property: transform;
+ transition-duration: 10s; /* large enough to let the spring happen */
+ transition-timing-function: spring(1 100 10 0);
+}
+
+</style>
+<script src="https://raw.github.com/dataarts/dat.gui/master/build/dat.gui.min.js"></script>
+<script src="spring.js"></script>
+<script>
+
+var Spring = function(element)
+{
+ this.element = element;
+ this.currentX = 100;
+ this.currentY = 200;
+ this.animationIsRunning = false;
+
+ this.mass = 1;
+ this.stiffness = 100;
+ this.damping = 10;
+ this.initialVelocity = 0;
+ this.useSystemSpring = false;
+};
+
+Spring.prototype = {
+ moveTo: function (x, y)
+ {
+ if (this._useSystemSpring) {
+ this.animationIsRunning = false;
+ this.element.style.transitionTimingFunction = `spring(${this.mass} ${this.stiffness} ${this.damping} ${this.initialVelocity})`;
+ this.element.style.transform = `translate(${x}px, ${y}px)`;
+ } else {
+ this.animationIsRunning = true;
+ var bounds = this.element.getBoundingClientRect();
+ this.currentX = bounds.left + 20;
+ this.currentY = bounds.top + 20;
+ this.startX = this.currentX;
+ this.startY = this.currentY;
+ this.targetX = x;
+ this.targetY = y;
+ this.startTime = Date.now() / 1000;
+ this.solver = new SpringSolver(this.mass, this.stiffness, this.damping, this.initialVelocity);
+ window.requestAnimationFrame(this.step.bind(this));
+ }
+ },
+
+ step: function()
+ {
+ if (!this.animationIsRunning) {
+ return;
+ }
+
+ var elapsed = Date.now() / 1000 - this.startTime;
+ var proportion = this.solver.solve(elapsed);
+
+ this.currentX = this.startX + (this.targetX - this.startX) * proportion;
+ this.currentY = this.startY + (this.targetY - this.startY) * proportion;
+ this.element.style.transform = `translate(${this.currentX}px, ${this.currentY}px)`;
+
+ // Keep animating for 10 seconds. Too bad if it hasn't finished by then.
+ if (elapsed < 10 * 1000) {
+ window.requestAnimationFrame(this.step.bind(this));
+ } else {
+ this.animationIsRunning = false;
+ }
+ },
+
+ get useSystemSpring()
+ {
+ return this._useSystemSpring;
+ },
+
+ set useSystemSpring(newValue)
+ {
+ this._useSystemSpring = newValue;
+ document.body.classList.toggle("useSystem", newValue);
+ }
+};
+
+window.addEventListener("load", function() {
+ var s = new Spring(document.getElementById("object"));
+ var gui = new dat.GUI();
+ gui.add(s, 'mass', 0, 20);
+ gui.add(s, 'stiffness', 0, 200);
+ gui.add(s, 'damping', 0, 50);
+ gui.add(s, 'initialVelocity', -50, 50);
+ gui.add(s, 'useSystemSpring');
+
+ document.getElementById("canvas").addEventListener("click", function (event) {
+ s.moveTo(event.clientX, event.clientY);
+ }, false);
+
+}, false);
+
+</script>
+</head>
+<body>
+ <h1>Spring timing function</h1>
+ <p>
+ Click/tap to move the object. Selecting "useSystemSpring" will run the
+ transition using the spring() timing function. Otherwise it
+ is the embedded JavaScript solver, which should be identical.
+ </p>
+
+ <div id="canvas">
+ <div id="object"></div>
+ </div>
+
+</body>
+</html>
</ins><span class="cx">Property changes on: trunk/Websites/webkit.org/demos/spring/index.html
</span><span class="cx">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4>Added: svn:eol-style</h4></div>
<ins>+native
</ins><span class="cx">\ No newline at end of property
</span><a id="svnkeywords"></a>
<div class="addfile"><h4>Added: svn:keywords</h4></div>
<ins>+Date Revision
</ins><span class="cx">\ No newline at end of property
</span><a id="svnmimetype"></a>
<div class="addfile"><h4>Added: svn:mime-type</h4></div>
<ins>+text/html
</ins><span class="cx">\ No newline at end of property
</span><a id="trunkWebsiteswebkitorgdemosspringspringjs"></a>
<div class="addfile"><h4>Added: trunk/Websites/webkit.org/demos/spring/spring.js (0 => 202665)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Websites/webkit.org/demos/spring/spring.js (rev 0)
+++ trunk/Websites/webkit.org/demos/spring/spring.js 2016-06-30 04:17:33 UTC (rev 202665)
</span><span class="lines">@@ -0,0 +1,56 @@
</span><ins>+/*
+ * Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+function SpringSolver(mass, stiffness, damping, initialVelocity)
+{
+ this.m_w0 = Math.sqrt(stiffness / mass);
+ this.m_zeta = damping / (2 * Math.sqrt(stiffness * mass));
+
+ if (this.m_zeta < 1) {
+ // Under-damped.
+ this.m_wd = this.m_w0 * Math.sqrt(1 - this.m_zeta * this.m_zeta);
+ this.m_A = 1;
+ this.m_B = (this.m_zeta * this.m_w0 + -initialVelocity) / this.m_wd;
+ } else {
+ // Critically damped (ignoring over-damped case for now).
+ this.m_wd = 0;
+ this.m_A = 1;
+ this.m_B = -initialVelocity + this.m_w0;
+ }
+}
+
+SpringSolver.prototype.solve = function (t)
+{
+ if (this.m_zeta < 1) {
+ // Under-damped
+ t = Math.exp(-t * this.m_zeta * this.m_w0) * (this.m_A * Math.cos(this.m_wd * t) + this.m_B * Math.sin(this.m_wd * t));
+ } else {
+ // Critically damped (ignoring over-damped case for now).
+ t = (this.m_A + thism_B * t) * Math.exp(-t * this.m_w0);
+ }
+
+ // Map range from [1..0] to [0..1].
+ return 1 - t;
+};
</ins><span class="cx">Property changes on: trunk/Websites/webkit.org/demos/spring/spring.js
</span><span class="cx">___________________________________________________________________
</span></span></pre></div>
<a id="svneolstyle"></a>
<div class="addfile"><h4>Added: svn:eol-style</h4></div>
<ins>+native
</ins><span class="cx">\ No newline at end of property
</span><a id="svnkeywords"></a>
<div class="addfile"><h4>Added: svn:keywords</h4></div>
<ins>+Date Revision
</ins><span class="cx">\ No newline at end of property
</span><a id="svnmimetype"></a>
<div class="addfile"><h4>Added: svn:mime-type</h4></div>
<ins>+text/plain
</ins><span class="cx">\ No newline at end of property
</span></div>
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