逼真的HTML5樹葉飄落動(dòng)畫
發(fā)布時(shí)間：2016-03-01 15:57:31 作者：佚名 
我要評(píng)論
我要評(píng)論這篇文章主要為大家詳細(xì)介紹了一款逼真的HTML5樹葉飄落動(dòng)畫，樹葉飄落的動(dòng)畫效果非常真實(shí)，樹葉都是圖片，并非CSS3繪制，感興趣的小伙伴們可以參考一下
這款HTML5樹葉飄落動(dòng)畫是基于webkit內(nèi)核的，也就是說要在webkit內(nèi)核的瀏覽器上才能使用這款動(dòng)畫。
HTML代碼
XML/HTML Code復(fù)制內(nèi)容到剪貼板
- <div id="container">
- <!-- The container is dynamically populated using the init function in leaves.js -->
- <!-- Its dimensions and position are defined using its id selector in leaves.css -->
- <div id="leafContainer"></div>
- <!-- its appearance, dimensions, and position are defined using its id selector in leaves.css -->
- <div id="message">
- <em>這是基于webkit的落葉動(dòng)畫</em>
- </div>
- </div>
CSS代碼
CSS Code復(fù)制內(nèi)容到剪貼板
- #container {
- position: relative;
- height: 700px;
- width: 500px;
- margin: 10px auto;
- overflow: hidden;
- border: 4px solid #5C090A;
- background: #4E4226 url('images/backgroundLeaves.jpg') no-repeat top left;
- }
- /* Defines the position and dimensions of the leafContainer div */
- #leafContainer
- {
- position: absolute;
- width: 100%;
- height: 100%;
- }
- /* Defines the appearance, position, and dimensions of the message div */
- #message
- {
- position: absolute;
- top: 160px;
- width: 100%;
- height: 300px;
- background:transparent url('images/textBackground.png') repeat-x center;
- color: #5C090A;
- font-size: 220%;
- font-family: 'Georgia';
- text-align: center;
- padding: 20px 10px;
- -webkit-box-sizing: border-box;
- -webkit-background-size: 100% 100%;
- z-index: 1;
- }
- p {
- margin: 15px;
- }
- a
- {
- color: #5C090A;
- text-decoration: none;
- }
- /* Sets the color of the "Dino's Gardening Service" message */
- em
- {
- font-weight: bold;
- font-style: normal;
- }
- .phone {
- font-size: 150%;
- vertical-align: middle;
- }
- /* This CSS rule is applied to all div elements in the leafContainer div.
- It styles and animates each leafDiv.
- */
- #leafContainer > div
- {
- position: absolute;
- width: 100px;
- height: 100px;
- /* We use the following properties to apply the fade and drop animations to each leaf.
- Each of these properties takes two values. These values respectively match a setting
- for fade and drop.
- */
- -webkit-animation-iteration-count: infinite, infinite;
- -webkit-animation-direction: normal, normal;
- -webkit-animation-timing-function: linear, ease-in;
- }
- /* This CSS rule is applied to all img elements directly inside div elements which are
- directly inside the leafContainer div. In other words, it matches the 'img' elements
- inside the leafDivs which are created in the createALeaf() function.
- */
- #leafContainer > div > img {
- position: absolute;
- width: 100px;
- height: 100px;
- /* We use the following properties to adjust the clockwiseSpin or counterclockwiseSpinAndFlip
- animations on each leaf.
- The createALeaf function in the Leaves.js file determines whether a leaf has the
- clockwiseSpin or counterclockwiseSpinAndFlip animation.
- */
- -webkit-animation-iteration-count: infinite;
- -webkit-animation-direction: alternate;
- -webkit-animation-timing-function: ease-in-out;
- -webkit-transform-origin: 50% -100%;
- }
- /* Hides a leaf towards the very end of the animation */
- @-webkit-keyframes fade
- {
- /* Show a leaf while into or below 95 percent of the animation and hide it, otherwise */
- 0% { opacity: 1; }
- 95% { opacity: 1; }
- 100% { opacity: 0; }
- }
- /* Makes a leaf fall from -300 to 600 pixels in the y-axis */
- @-webkit-keyframes drop
- {
- /* Move a leaf to -300 pixels in the y-axis at the start of the animation */
- 0% { -webkit-transform: translate(0px, -50px); }
- /* Move a leaf to 600 pixels in the y-axis at the end of the animation */
- 100% { -webkit-transform: translate(0px, 650px); }
- }
- /* Rotates a leaf from -50 to 50 degrees in 2D space */
- @-webkit-keyframes clockwiseSpin
- {
- /* Rotate a leaf by -50 degrees in 2D space at the start of the animation */
- 0% { -webkit-transform: rotate(-50deg); }
- /* Rotate a leaf by 50 degrees in 2D space at the end of the animation */
- 100% { -webkit-transform: rotate(50deg); }
- }
- /* Flips a leaf and rotates it from 50 to -50 degrees in 2D space */
- @-webkit-keyframes counterclockwiseSpinAndFlip
- {
- /* Flip a leaf and rotate it by 50 degrees in 2D space at the start of the animation */
- 0% { -webkit-transform: scale(-1, 1) rotate(50deg); }
- /* Flip a leaf and rotate it by -50 degrees in 2D space at the end of the animation */
- 100% { -webkit-transform: scale(-1, 1) rotate(-50deg); }
- }
JavaScript代碼
JavaScript Code復(fù)制內(nèi)容到剪貼板
- /* Define the number of leaves to be used in the animation */
- const NUMBER_OF_LEAVES = 30;
- /*
- Called when the "Falling Leaves" page is completely loaded.
- */
- function init()
- {
- /* Get a reference to the element that will contain the leaves */
- var container = document.getElementById('leafContainer');
- /* Fill the empty container with new leaves */
- for (var i = 0; i < NUMBER_OF_LEAVES; i++)
- {
- container.appendChild(createALeaf());
- }
- }
- /*
- Receives the lowest and highest values of a range and
- returns a random integer that falls within that range.
- */
- function randomInteger(low, high)
- {
- return low + Math.floor(Math.random() * (high - low));
- }
- /*
- Receives the lowest and highest values of a range and
- returns a random float that falls within that range.
- */
- function randomFloat(low, high)
- {
- return low + Math.random() * (high - low);
- }
- /*
- Receives a number and returns its CSS pixel value.
- */
- function pixelValue(value)
- {
- return value + 'px';
- }
- /*
- Returns a duration value for the falling animation.
- */
- function durationValue(value)
- {
- return value + 's';
- }
- /*
- Uses an img element to create each leaf. "Leaves.css" implements two spin
- animations for the leaves: clockwiseSpin and counterclockwiseSpinAndFlip. This
- function determines which of these spin animations should be applied to each leaf.
- */
- function createALeaf()
- {
- /* Start by creating a wrapper div, and an empty img element */
- var leafDiv = document.createElement('div');
- var image = document.createElement('img');
- /* Randomly choose a leaf image and assign it to the newly created element */
- image.src = 'images/realLeaf' + randomInteger(1, 5) + '.png';
- leafDiv.style.top = "-100px";
- /* Position the leaf at a random location along the screen */
- leafDiv.style.left = pixelValue(randomInteger(0, 500));
- /* Randomly choose a spin animation */
- var spinAnimationName = (Math.random() < 0.5) ? 'clockwiseSpin' : 'counterclockwiseSpinAndFlip';
- /* Set the -webkit-animation-name property with these values */
- leafDiv.style.webkitAnimationName = 'fade, drop';
- image.style.webkitAnimationName = spinAnimationName;
- /* Figure out a random duration for the fade and drop animations */
- var fadeAndDropDuration = durationValue(randomFloat(5, 11));
- /* Figure out another random duration for the spin animation */
- var spinDuration = durationValue(randomFloat(4, 8));
- /* Set the -webkit-animation-duration property with these values */
- leafDiv.style.webkitAnimationDuration = fadeAndDropDuration + ', ' + fadeAndDropDuration;
- var leafDelay = durationValue(randomFloat(0, 5));
- leafDiv.style.webkitAnimationDelay = leafDelay + ', ' + leafDelay;
- image.style.webkitAnimationDuration = spinDuration;
- // add the <img> to the <div>
- leafDiv.appendChild(image);
- /* Return this img element so it can be added to the document */
- return leafDiv;
- }
- /* Calls the init function when the "Falling Leaves" page is full loaded */
- window.addEventListener('load', init, false);
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家學(xué)習(xí)有所幫助。
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