使用Javascript的跨浏览器支持的图像偏斜效果

Image shaking effect with javascript. Today’s lesson quite entertaining, we’ll learn how to construct a shaking effect. For clarity, we will apply this effect to the picture. You will need to hold down by mouse a certain area in the image and move it to another location (drag). Now, I sure that better to see our online demonstration. How did it achieve? In principle, simply enough, the entire ‘image’ divided into 4 sectors. Place, where we will begin to drag by mouse – is the boundary separating of our four pictures. And shaking effect itself – will only change the sizes of our sectors and pictures in them. Read more.

图像抖动与javascript。今天的课程非常有趣，我们将学习如何构建震撼效果。为了清楚起见，我们将这种效果应用于图片。您将需要用鼠标按住图像中的某个区域，然后将其移动到另一个位置(拖动)。现在，我相信最好看一下我们的在线演示。它是如何实现的？原则上，很简单，整个“图像”分为四个部分。我们将开始用鼠标拖动的地方–是四张图片的边界。抖动效果本身–只会更改我们的扇区和其中的图片的大小。。

Here are samples and downloadable package:

以下是示例和可下载的软件包：

现场演示

[sociallocker]

[社交储物柜]

打包下载

[/sociallocker]

[/ sociallocker]

Ok, download the example files and lets start coding !

好的，下载示例文件并开始编码！

步骤1. HTML (Step 1. HTML)

As usual, we start with the HTML. This is source code of our sample:

和往常一样，我们从HTML开始。这是我们示例的源代码：

index.html (index.html)


<html>
<head><title>Image shaking effect using pure JavaScript</title><link rel="stylesheet" type="text/css" href="css/main.css" /><script type="text/javascript" src="js/main.js"></script>
</head><body><div class="example"><div id="main_object"><div class="tl"><img alt="" src="data:image.jpg"></div><div class="tr"><img alt="" src="data:image.jpg"></div><div class="bl"><img alt="" src="data:image.jpg"></div><div class="br"><img alt="" src="data:image.jpg"></div></div></div></body>
</html>


<html>
<head><title>Image shaking effect using pure JavaScript</title><link rel="stylesheet" type="text/css" href="css/main.css" /><script type="text/javascript" src="js/main.js"></script>
</head><body><div class="example"><div id="main_object"><div class="tl"><img alt="" src="data:image.jpg"></div><div class="tr"><img alt="" src="data:image.jpg"></div><div class="bl"><img alt="" src="data:image.jpg"></div><div class="br"><img alt="" src="data:image.jpg"></div></div></div></body>
</html>

Here are main object with 4 images inside

这是里面有4张图像的主要对象

步骤2. CSS (Step 2. CSS)

Here are single CSS file with all necessary styles:

这是具有所有必要样式的单个CSS文件：

css / main.css (css/main.css)


body{background:#eee;margin:0;padding:0}
.example{background:#FFF;width:900px;border:1px #000 solid;margin:20px auto;padding:15px;-moz-border-radius: 3px;-webkit-border-radius: 3px}
#main_object{position:relative;width:900px;height:675px;overflow:hidden;cursor:pointer}
#main_object div{position:absolute;overflow:hidden}
#main_object img{position:absolute;-ms-interpolation-mode:nearest-neighbor}
#main_object .tl,#main_object .tl img{top:0;left:0}
#main_object .tr,#main_object .tr img{top:0;right:0}
#main_object .bl,#main_object .bl img{bottom:0;left:0}
#main_object .br,#main_object .br img{right:0;bottom:0}


body{background:#eee;margin:0;padding:0}
.example{background:#FFF;width:900px;border:1px #000 solid;margin:20px auto;padding:15px;-moz-border-radius: 3px;-webkit-border-radius: 3px}
#main_object{position:relative;width:900px;height:675px;overflow:hidden;cursor:pointer}
#main_object div{position:absolute;overflow:hidden}
#main_object img{position:absolute;-ms-interpolation-mode:nearest-neighbor}
#main_object .tl,#main_object .tl img{top:0;left:0}
#main_object .tr,#main_object .tr img{top:0;right:0}
#main_object .bl,#main_object .bl img{bottom:0;left:0}
#main_object .br,#main_object .br img{right:0;bottom:0}

步骤3. JS (Step 3. JS)

Here are our main Javascript:

这是我们的主要Javascript：

js / main.js (js/main.js)


var ishk = {// variablesspeedD : .98, // degree of attenuationspeedX : 50, // speed by XspeedY : 60, // speed by X// inner variablesxm   : 0,ym   : 0,sx   : 1,sy   : 1,svx  : 0,svy  : 0,xd   : 1,yd   : 1,drag : false,// initializationinit : function() {// firstly we will pass through all inner div`s and its images and collect stylesthis.mobj = document.getElementById('main_object');var div = this.mobj.getElementsByTagName('div');this.d = [];this.i = [];for (var i = 0; i<4; i++) {this.d[i] = div[i].style;this.i[i] = div[i].getElementsByTagName('img')[0].style;}// set initial params of our generated resultthis.resize();// prevent text selection in IEdocument.onselectstart = function() {return false;}// prevent IE from trying to drag an imagethis.mobj.ondrag = function() {return false;}// mouse down event, we will set 'drag flag to true, change cursor and positionsthis.mobj.onmousedown = function() {ishk.drag = true;ishk.mobj.style.cursor = 'move';ishk.xd = ishk.xm - ishk.nx;ishk.yd = ishk.ym - ishk.ny;return false;}// on mouse up - release 'drag' flag, change pointerdocument.onmouseup = function() {ishk.drag = false;ishk.mobj.style.cursor = 'pointer';return false;}// set max sizes to last imagethis.i[3].width =  ishk.nw;this.i[3].height = ishk.nh;// and initial positions tooishk.sx = ishk.nx;ishk.sy = ishk.ny;// start loopingthis.shake();},// refreshing mouse positionsmousemove : function(e) {this.xm = e.clientX;this.ym = e.clientY;},// sub init of initial positions, plus, in case of window resizing - repeat tooresize : function() {var o = ishk.mobj;for (ishk.nx = 0, ishk.ny = 0; o != null; o = o.offsetParent)ishk.nx += o.offsetLeft, ishk.ny += o.offsetTop;ishk.nw = ishk.mobj.offsetWidth;ishk.nh = ishk.mobj.offsetHeight;},// main shaking functionshake : function() {// in case of mouse move and dragging - change center positionif (ishk.drag) {ishk.sx = ishk.xm;ishk.sy = ishk.ym;} else { // otherwise - attenuationishk.svx = ishk.speedD * ishk.svx - (ishk.sx - ishk.xd - ishk.nx) / ishk.speedX;ishk.svy = ishk.speedD * ishk.svy - (ishk.sy - ishk.yd - ishk.ny) / ishk.speedY;ishk.sx += ishk.svx;ishk.sy += ishk.svy;}// calculation new widths and heights of our div`s and imagesvar w0 = Math.max(0, Math.round(ishk.sx) - ishk.nx);var h0 = Math.max(0, Math.round(ishk.sy) - ishk.ny);var w1 = Math.max(0, ishk.nw - (Math.round(ishk.sx) - ishk.nx));var h1 = Math.max(0, ishk.nh - (Math.round(ishk.sy) - ishk.ny));var w2 = Math.max(0, Math.round((w0 * ishk.nw) / ishk.xd));var h2 = Math.max(0, Math.round((h0 * ishk.nh) / ishk.yd));var w3 = Math.max(0, Math.round((w1 * ishk.nw) / (ishk.nw - ishk.xd)));var h3 = Math.max(0, Math.round((h1 * ishk.nh) / (ishk.nh - ishk.yd)));// apply new widthsishk.d[0].width = w0 + 'px';ishk.d[1].width = w1 + 'px';ishk.d[2].width = w0 + 'px';ishk.d[3].width = w1 + 'px';ishk.d[0].height = h0 + 'px';ishk.d[1].height = h0 + 'px';ishk.d[2].height = h1 + 'px';ishk.d[3].height = h1 + 'px';ishk.i[0].width = w2 + 'px';ishk.i[1].width = w3 + 'px';ishk.i[2].width = w2 + 'px';ishk.i[3].width = w3 + 'px';ishk.i[0].height = h2 + 'px';ishk.i[1].height = h2 + 'px';ishk.i[2].height = h3 + 'px';ishk.i[3].height = h3 + 'px';// looping current functionsetTimeout(ishk.shake, 20); // 1/50*1000 = 20ms (for 50 fps) :)}
};
window.onload = function() {ishk.init(); // first initialization// binding mouse move eventdocument.onmousemove = function(e) {if (window.event) e = window.event; // for IEishk.mousemove(e);}// binding onresize eventwindow.onresize = ishk.resize;
}


var ishk = {// variablesspeedD : .98, // degree of attenuationspeedX : 50, // speed by XspeedY : 60, // speed by X// inner variablesxm   : 0,ym   : 0,sx   : 1,sy   : 1,svx  : 0,svy  : 0,xd   : 1,yd   : 1,drag : false,// initializationinit : function() {// firstly we will pass through all inner div`s and its images and collect stylesthis.mobj = document.getElementById('main_object');var div = this.mobj.getElementsByTagName('div');this.d = [];this.i = [];for (var i = 0; i<4; i++) {this.d[i] = div[i].style;this.i[i] = div[i].getElementsByTagName('img')[0].style;}// set initial params of our generated resultthis.resize();// prevent text selection in IEdocument.onselectstart = function() {return false;}// prevent IE from trying to drag an imagethis.mobj.ondrag = function() {return false;}// mouse down event, we will set 'drag flag to true, change cursor and positionsthis.mobj.onmousedown = function() {ishk.drag = true;ishk.mobj.style.cursor = 'move';ishk.xd = ishk.xm - ishk.nx;ishk.yd = ishk.ym - ishk.ny;return false;}// on mouse up - release 'drag' flag, change pointerdocument.onmouseup = function() {ishk.drag = false;ishk.mobj.style.cursor = 'pointer';return false;}// set max sizes to last imagethis.i[3].width =  ishk.nw;this.i[3].height = ishk.nh;// and initial positions tooishk.sx = ishk.nx;ishk.sy = ishk.ny;// start loopingthis.shake();},// refreshing mouse positionsmousemove : function(e) {this.xm = e.clientX;this.ym = e.clientY;},// sub init of initial positions, plus, in case of window resizing - repeat tooresize : function() {var o = ishk.mobj;for (ishk.nx = 0, ishk.ny = 0; o != null; o = o.offsetParent)ishk.nx += o.offsetLeft, ishk.ny += o.offsetTop;ishk.nw = ishk.mobj.offsetWidth;ishk.nh = ishk.mobj.offsetHeight;},// main shaking functionshake : function() {// in case of mouse move and dragging - change center positionif (ishk.drag) {ishk.sx = ishk.xm;ishk.sy = ishk.ym;} else { // otherwise - attenuationishk.svx = ishk.speedD * ishk.svx - (ishk.sx - ishk.xd - ishk.nx) / ishk.speedX;ishk.svy = ishk.speedD * ishk.svy - (ishk.sy - ishk.yd - ishk.ny) / ishk.speedY;ishk.sx += ishk.svx;ishk.sy += ishk.svy;}// calculation new widths and heights of our div`s and imagesvar w0 = Math.max(0, Math.round(ishk.sx) - ishk.nx);var h0 = Math.max(0, Math.round(ishk.sy) - ishk.ny);var w1 = Math.max(0, ishk.nw - (Math.round(ishk.sx) - ishk.nx));var h1 = Math.max(0, ishk.nh - (Math.round(ishk.sy) - ishk.ny));var w2 = Math.max(0, Math.round((w0 * ishk.nw) / ishk.xd));var h2 = Math.max(0, Math.round((h0 * ishk.nh) / ishk.yd));var w3 = Math.max(0, Math.round((w1 * ishk.nw) / (ishk.nw - ishk.xd)));var h3 = Math.max(0, Math.round((h1 * ishk.nh) / (ishk.nh - ishk.yd)));// apply new widthsishk.d[0].width = w0 + 'px';ishk.d[1].width = w1 + 'px';ishk.d[2].width = w0 + 'px';ishk.d[3].width = w1 + 'px';ishk.d[0].height = h0 + 'px';ishk.d[1].height = h0 + 'px';ishk.d[2].height = h1 + 'px';ishk.d[3].height = h1 + 'px';ishk.i[0].width = w2 + 'px';ishk.i[1].width = w3 + 'px';ishk.i[2].width = w2 + 'px';ishk.i[3].width = w3 + 'px';ishk.i[0].height = h2 + 'px';ishk.i[1].height = h2 + 'px';ishk.i[2].height = h3 + 'px';ishk.i[3].height = h3 + 'px';// looping current functionsetTimeout(ishk.shake, 20); // 1/50*1000 = 20ms (for 50 fps) :)}
};
window.onload = function() {ishk.init(); // first initialization// binding mouse move eventdocument.onmousemove = function(e) {if (window.event) e = window.event; // for IEishk.mousemove(e);}// binding onresize eventwindow.onresize = ishk.resize;
}

It is rather simple. When the page loads – I initialize our main object, and link all the necessary events. Then, after initialization, I loop our main ‘shake’ function, which changing sizes of all our 4 images (sectors).

这很简单。页面加载时–我初始化我们的主对象，并链接所有必要的事件。然后，在初始化之后，我循环我们的主要“摇动”功能，该功能会更改所有4个图像(扇区)的大小。

步骤4.图片 (Step 4. Images)

For our demo I used only one image:

对于我们的演示，我只使用了一张图像：

现场演示

结论 (Conclusion)

Today I told you how to create easy shaking effect to images. Commonly – you can try to play with any another objects too. Hope our javascript lessons still interesting for you. Good luck!

今天，我告诉您如何对图像创建轻松的抖动效果。通常-您也可以尝试与其他任何物体一起玩。希望我们JavaScript课程对您仍然很有趣。祝好运！

翻译自: https://www.script-tutorials.com/cross-browser-image-shaking-effect-using-javascript/