Help needed with JQuery 3D carousel
Hi,
I'm trying to modify the Jquery 3D carousel found here:
http://www.professorcloud.com/mainsite/carousel.htm
I'm simply trying to move the front image over to the left by 200px so i can place some text to the right of it.
Here is all the code:
- (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 reflection, cntx, imageWidth = img.width, imageHeight = img.width, gradient, parent;
parent = $(img.parentNode);
if ($.browser.msie) {
this.element = reflection = parent.append("<img class='reflection' style='position:absolute'/>").find(':last')[0];
reflection.src = img.src;
reflection.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 {
this.element = reflection = parent.append("<canvas class='reflection' style='position:absolute'/>").find(':last')[0];
if (!reflection.getContext)
{
return;
}
cntx = reflection.getContext("2d");
try {
$(reflection).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
$(reflection).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);
}
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('mouseover',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);
$(options.altBox).html( ($(event.target).attr('alt') ));
$(options.titleBox).html( ($(event.target).attr('title') ));
}
});
// 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 to the neigbouring item.
this.rotate = function(direction)
{
this.frontIndex -= direction;
// Keep a note of the item at the front.
if (this.frontIndex<0) { this.frontIndex = items.length-1; }
if (this.frontIndex > items.length-1) { this.frontIndex=0; }
//
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) *0.5;
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.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 ) );
}
// If all images have valid widths and heights, we can stop checking.
clearInterval(this.tt);
this.showFrontText();
this.autoRotate();
this.updateAll();
};
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,
altBox:null,
titleBox:null,
FPS: 30,
autoRotate: 'no',
autoRotateDelay: 1500,
speed:0.2,
mouseWheel: false
},options );
// Create a Controller for each carousel.
$(this).data('cloudcarousel', new Controller( this, $('.cloudcarousel',$(this)), options) );
});
return this;
};
})(jQuery);
I think the key lines of code are these:
- // Keep a note of the item at the front.
if (this.frontIndex<0) { this.frontIndex = items.length-1; }
if (this.frontIndex > items.length-1) { this.frontIndex=0; }
//
Is there any way of adding a class to the front item, but then when it is no longer the front item to remove the class?
Many thanks in advance!