我在互联网上发现了这个插件，并将它用于我的任务，但它有一个问题，例如我有4个标志的图像，云旋转木马插件将使这些标志在圆圈转，但当它停止前面旗帜和后旗不停在中心，我的意思是4旗的位置不正确，我不知道如何更清楚地谈论它，但请看图像你会明白我得到的问题。另外，我不擅长数学，我不知道如何像插件一样计算。请看一下建议我一些解决方案。提前谢谢！
这是问题的图像：
http://www.mediafire.com/i/?onvaklt5kbqgxt8
or
http://imageshack.us/photo/my-images/4/imgproblem.png/
这是一个正确的例子：
http://www.mediafire.com/i/?uqk4c1ndyeo50q2
or
http://imageshack.us/photo/my-images/135/examplecd.jpg/
这里是html代码：
<div class="circle" id="carousel">
<img class="cloudcarousel" src="images/flag_spain.png" title="Treatment with Baraclude was generally well tolerated and no patients discontinued treatment due to AEs.1"
alt="ORIENTE Study (n=190)" />
<img class="cloudcarousel" src="images/flag_italy.png" title="No major safety issues were recorded; none of the patients had to stop or reduce the dose during the study.2 "
alt="Italian Cohort (n=418) " />
<img class="cloudcarousel" src="images/flag_eu.png" title="[Baraclude] was safe and didn’t affect renal function or cause lactic acidosis.3"
alt="VIRGIL Study - Naïve cohort (n=243)" />
<img class="cloudcarousel" src="images/flag_hongkong.png" title="There were no serious adverse events related to the drug.4"
alt="Hong Kong Study (n=222)" />
<p id="title-box">
</p>
<div id="all-box">
</div>
<span id="alt-box"></span>
</div>
这是css代码：
.circle {
background:url(../images/circle.png) no-repeat;
/*width:445px;
height:138px;
position:absolute;
top:315px;
left:288px;*/
width:650px;
height:475px;
position:absolute;
top:165px;
left:185px;
}
#title-box {
background-image:url(../images/title_bg.png);
color: #000;
font-size: 2em;
height: 100px;
padding: 24px 20px 20px 20px;
text-align: center;
width: 610px;
}
#alt-box
{
bottom: 0;
height: 25px;
left: 0;
position: absolute;
width: 650px;
}
.cloudcarousel {
opacity: 0;
}
这是插件的代码，我编辑了一些。
//////////////////////////////////////////////////////////////////////////////////
// CloudCarousel V1.0.5
// (c) 2011 by R Cecco. <http://www.professorcloud.com>
// MIT License
//
// reflection code based on plugin by Christophe Beyls <http://www.digitalia.be>
//
// Please retain this copyright header in all versions of the software
//////////////////////////////////////////////////////////////////////////////////
(function ($) {
// START reflection object.
// Creates a reflection for underneath an image.
// IE uses an image with IE specific filter properties, other browsers use the Canvas tag.
// The position and size of the reflection gets updated by updateAll() in controller.
function reflection(img, reflHeight, opacity) {
var reflect, cntx, imageWidth = img.width, imageHeight = img.width, gradient, parent;
parent = $(img.parentNode);
this.element = reflect = parent.append("<canvas class='reflection' style='position:absolute'/>").find(':last')[0];
if (!reflection.getContext && $.browser.msie) {
this.element = reflection = parent.append("<img class='reflection' style='position:absolute'/>").find(':last')[0];
reflect.src = img.src;
reflect.style.filter = "flipv progid:DXImageTransform.Microsoft.Alpha(opacity=" + (opacity * 100) + ", style=1, finishOpacity=0, startx=0, starty=0, finishx=0, finishy=" + (reflHeight / imageHeight * 100) + ")";
} else {
cntx = reflection.getContext("2d");
try {
$(reflect).attr({ width: imageWidth, height: reflHeight });
cntx.save();
cntx.translate(0, imageHeight - 1);
cntx.scale(1, -1);
cntx.drawImage(img, 0, 0, imageWidth, imageHeight);
cntx.restore();
cntx.globalCompositeOperation = "destination-out";
gradient = cntx.createLinearGradient(0, 0, 0, reflHeight);
gradient.addColorStop(0, "rgba(255, 255, 255, " + (1 - opacity) + ")");
gradient.addColorStop(1, "rgba(255, 255, 255, 1.0)");
cntx.fillStyle = gradient;
cntx.fillRect(0, 0, imageWidth, reflHeight);
} catch (e) {
return;
}
}
// Store a copy of the alt and title attrs into the reflection
$(reflect).attr({ 'alt': $(img).attr('alt'), title: $(img).attr('title') });
} //END reflection object
// START item object.
// A wrapper object for items within the carousel.
var item = function (imgIn, options) {
this.orgWidth = imgIn.width;
this.orgHeight = imgIn.height;
this.image = imgIn;
this.reflection = null;
this.alt = imgIn.alt;
this.title = imgIn.title;
this.imageOK = false;
this.options = options;
this.imageOK = true;
if (this.options.reflHeight > 0) {
this.reflection = new reflection(this.image, this.options.reflHeight, this.options.reflOpacity);
}
$(this.image).css('position', 'absolute'); // Bizarre. This seems to reset image width to 0 on webkit!
}; // END item object
// controller object.
// This handles moving all the items, dealing with mouse clicks etc.
var controller = function (container, images, options) {
var items = [], funcSin = Math.sin, funcCos = Math.cos, ctx = this;
this.controlTimer = 0;
this.stopped = false;
//this.imagesLoaded = 0;
this.container = container;
this.xRadius = options.xRadius;
this.yRadius = options.yRadius;
this.showFrontTextTimer = 0;
this.autoRotateTimer = 0;
if (options.xRadius === 0) {
this.xRadius = ($(container).width() / 2.3);
console.log(this.xRadius);
}
if (options.yRadius === 0) {
this.yRadius = ($(container).height() / 6);
}
this.xCentre = options.xPos;
this.yCentre = options.yPos;
this.frontIndex = 0; // Index of the item at the front
// Start with the first item at the front.
this.rotation = this.destRotation = Math.PI / 2;
this.timeDelay = 1000 / options.FPS;
// Turn on the infoBox
if (options.altBox !== null) {
$(options.altBox).css('display', 'block');
$(options.titleBox).css('display', 'block');
}
// Turn on relative position for container to allow absolutely positioned elements
// within it to work.
$(container).css({ position: 'relative', overflow: 'hidden' });
$(options.buttonLeft).css('display', 'inline');
$(options.buttonRight).css('display', 'inline');
// Setup the buttons.
$(options.buttonLeft).bind('mouseup', this, function (event) {
event.data.rotate(-1);
return false;
});
$(options.buttonRight).bind('mouseup', this, function (event) {
event.data.rotate(1);
return false;
});
// You will need this plugin for the mousewheel to work: http://plugins.jquery.com/project/mousewheel
// if (options.mouseWheel) {
// $(container).bind('mousewheel', this, function (event, delta) {
// event.data.rotate(delta);
// return false;
// });
// }
$(container).bind('click', this, function (event) {
clearInterval(event.data.autoRotateTimer); // Stop auto rotation if mouse over.
var text = $(event.target).attr('alt');
// If we have moved over a carousel item, then show the alt and title text.
if (text !== undefined && text !== null) {
clearTimeout(event.data.showFrontTextTimer);
//if (event.type == 'click') {
$(options.altBox).html(($(event.target).attr('alt')));
$(options.titleBox).html(($(event.target).attr('title')));
//}
//if (options.bringToFront && event.type == 'click') {
if (options.bringToFront) {
var idx = $(event.target).data('itemIndex');
var frontIndex = event.data.frontIndex;
//var diff = idx - frontIndex;
var diff = (idx - frontIndex) % images.length;
if (Math.abs(diff) > images.length / 2) {
diff += (diff > 0 ? -images.length : images.length);
}
event.data.rotate(-diff);
console.log(-diff);
}
}
});
$(options.specialBox).bind('click', this, function (event) {
event.data.rotate(0.5);
});
// If we have moved out of a carousel item (or the container itself),
// restore the text of the front item in 1 second.
// $(container).bind('mouseout', this, function (event) {
// var context = event.data;
// clearTimeout(context.showFrontTextTimer);
// context.showFrontTextTimer = setTimeout(function () { context.showFrontText(); }, 1000);
// context.autoRotate(); // Start auto rotation.
// });
// Prevent items from being selected as mouse is moved and clicked in the container.
$(container).bind('mousedown', this, function (event) {
event.data.container.focus();
return false;
});
container.onselectstart = function () { return false; }; // For IE.
this.innerWrapper = $(container).wrapInner('<div style="position:absolute;width:100%;height:100%;"/>').children()[0];
// Shows the text from the front most item.
this.showFrontText = function () {
if (items[this.frontIndex] === undefined) { return; } // Images might not have loaded yet.
$(options.titleBox).html($(items[this.frontIndex].image).attr('title'));
$(options.altBox).html($(items[this.frontIndex].image).attr('alt'));
};
this.go = function () {
if (this.controlTimer !== 0) { return; }
var context = this;
this.controlTimer = setTimeout(function () { context.updateAll(); }, this.timeDelay);
};
this.stop = function () {
clearTimeout(this.controlTimer);
this.controlTimer = 0;
};
// Starts the rotation of the carousel. Direction is the number (+-) of carousel items to rotate by.
this.rotate = function (direction) {
this.frontIndex -= direction;
this.frontIndex %= items.length;
this.destRotation += (Math.PI / items.length) * (2 * direction);
this.showFrontText();
this.go();
};
this.autoRotate = function () {
if (options.autoRotate !== 'no') {
var dir = (options.autoRotate === 'right') ? 1 : -1;
this.autoRotateTimer = setInterval(function () { ctx.rotate(dir); }, options.autoRotateDelay);
}
};
// This is the main loop function that moves everything.
this.updateAll = function () {
var minScale = options.minScale; // This is the smallest scale applied to the furthest item.
var smallRange = (1 - minScale) * 0.4;
var w, h, x, y, scale, item, sinVal;
var change = (this.destRotation - this.rotation);
var absChange = Math.abs(change);
this.rotation += change * options.speed;
if (absChange < 0.001) { this.rotation = this.destRotation; }
var itemsLen = items.length;
var spacing = (Math.PI / itemsLen) * 2;
//var wrapStyle = null;
var radians = this.rotation;
var isMSIE = $.browser.msie;
// Turn off display. This can reduce repaints/reflows when making style and position changes in the loop.
// See http://dev.opera.com/articles/view/efficient-javascript/?page=3
this.innerWrapper.style.display = 'none';
var style;
var px = 'px', reflHeight;
var context = this;
for (var i = 0; i < itemsLen; i++) {
item = items[i];
sinVal = funcSin(radians);
scale = ((sinVal + 1) * smallRange) + minScale;
x = this.xCentre + (((funcCos(radians) * this.xRadius) - (item.orgWidth * 0.5)) * scale);
y = this.yCentre + (((sinVal * this.yRadius)) * scale);
if (item.imageOK) {
var img = item.image;
//w = img.width = item.orgWidth * scale;
//h = img.height = item.orgHeight * scale;
img.style.webkittransition = 'transform 0.5s linear, left 0.5s linear, top 0.5s linear';
img.style.webkitTransform = 'scale(' + scale + ')';
w = item.orgWidth * scale;
h = item.orgHeight * scale;
//x = x == 214 ? 235 : x;
//x = x == 249 ? 235 : x;
if (i == 0) {
console.log('x : ' + x);
console.log('absChange : ' + absChange);
}
img.style.left = x + px;
img.style.top = y + px;
img.style.zIndex = "" + (scale * 100) >> 0; // >>0 = Math.foor(). Firefox doesn't like fractional decimals in z-index.
if (item.reflection !== null) {
reflHeight = options.reflHeight * scale;
style = item.reflection.element.style;
style.left = x + px;
style.top = y + h + options.reflGap * scale + px;
style.width = w + px;
if (isMSIE) {
style.filter.finishy = (reflHeight / h * 100);
} else {
style.height = reflHeight + px;
}
}
}
radians += spacing;
}
// Turn display back on.
this.innerWrapper.style.display = 'block';
// If we have a preceptable change in rotation then loop again next frame.
if (absChange >= 0.001) {
this.controlTimer = setTimeout(function () { context.updateAll(); }, this.timeDelay);
} else {
// Otherwise just stop completely.
this.stop();
}
}; // END updateAll
// Create an item object for each image
// func = function(){return;ctx.updateAll();} ;
// Check if images have loaded. We need valid widths and heights for the reflections.
this.checkImagesLoaded = function () {
var i;
for (i = 0; i < images.length; i++) {
if ((images[i].width === undefined) || ((images[i].complete !== undefined) && (!images[i].complete))) {
return;
}
}
for (i = 0; i < images.length; i++) {
items.push(new item(images[i], options));
$(images[i]).data('itemIndex', i);
}
// If all images have valid widths and heights, we can stop checking.
clearInterval(this.tt);
this.showFrontText();
this.autoRotate();
this.updateAll();
for (i = 0; i < images.length; i++) {
images[i].style.opacity = 1;
}
};
this.tt = setInterval(function () { ctx.checkImagesLoaded(); }, 50);
}; // END controller object
// The jQuery plugin part. Iterates through items specified in selector and inits a controller class for each one.
$.fn.CloudCarousel = function (options) {
this.each(function () {
options = $.extend({}, {
reflHeight: 0,
reflOpacity: 0.5,
reflGap: 0,
minScale: 0.5,
xPos: 0,
yPos: 0,
xRadius: 0,
yRadius: 0,
specialBox: null,
altBox: null,
titleBox: null,
FPS: 30,
autoRotate: 'no',
autoRotateDelay: 1500,
speed: 0.2,
mouseWheel: false,
bringToFront: false
}, options);
// Create a controller for each carousel.
$(this).data('cloudcarousel', new controller(this, $('.cloudcarousel', $(this)), options));
});
return this;
};
})(jQuery);
// this is my code that implement the plugin above
$(document).bind('ready', function () {
$("#carousel").CloudCarousel({
minScale: 0.4,
xPos: 280,
yPos: 0,
xRadius: 260,
yRadius: 0,
FPS: 50,
specialBox: '#all-box',
titleBox: '#title-box',
altBox: '#alt-box',
autoRotate: 'no',
auted: 0.1,
bringToFront: true
});
});
答案 0 :(得分：3)
请将您正在拨打的电话发给CloudCarousel。您可以在此调用中轻松指定居中参数。
正是关于正确计算xPos的一切。让我试着告诉你如何计算它。
计算轮播容器的宽度（在您的情况下为650）;
通常通过将xPos指定为轮播容器宽度的一半，您应该获得正确的结果。
请参阅网站http://www.professorcloud.com/mainsite/carousel-integration.htm上提供的文档。这是不言自明的。