H5实现可拖动的360度环拍物品展示（2）

痛定思痛。 2021-12-11 15:04 208阅读 0赞

之前通过**treesixty.js 插件**实现了可拖拽的360度环拍物品展示[ H5实现可拖动的360度环拍物品展示（1）][H5_360_1]

现在使用另外一个方法来实现类似的效果。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNzg3NjE5_size_16_color_FFFFFF_t_70][]

需要用到的图片为：

一张初始视角jpg图片和一张高相同的长条图，长条图包含每张角度物品图片。

![20190709115838635.png][]

实现过程

html

<!doctype html>
    <html lang="en" class="no-js">
    <head>
    	<meta charset="UTF-8">
    	<meta name="viewport" content="width=device-width, initial-scale=1">
    	 
    	<link rel="stylesheet" href="css/style.css"> 
      	
    	<title>360 Degrees</title>
    </head>
    <body>
    
    <div class="cd-product-viewer-wrapper" data-frame="34" data-friction="0.33"> 
    	<div>
    		<figure class="product-viewer">
    			<img src="img/whtiecarView.jpg" alt="Product Preview">
    			<div class="product-sprite" data-image="img/whitecar.png"></div>
    		</figure> 
    	</div> 
    </div> 
    	
    <script src="js/jquery-2.1.4.js"></script>
    
    <script src="js/main.js"></script> 
    </body>
    </html>

css

html * {
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    *, *::after, *::before {
      box-sizing: border-box;
    }
    
    html {
      font-size: 62.5%;
    }
    
    body {
      font-size: 1.6rem;
      font-family: "Lato", sans-serif;
      color: #ffffff;
      background-color: #f6f6f6;
      /* overflow: hidden; */
    }
    
    a {
      color: #b54240;
      text-decoration: none;
    }
    
    img {
      max-width: 100%;
    }
    .cd-product-viewer-wrapper {
      text-align: center;
    }
    .cd-product-viewer-wrapper > div {
      display: inline-block;
    }
    .cd-product-viewer-wrapper .product-viewer {
      position: relative;
      z-index: 1;
      display: inline-block;
      overflow: hidden;
    }
    .cd-product-viewer-wrapper img {
      display: block;
      position: relative;
      z-index: 1;
    }
    .cd-product-viewer-wrapper .product-sprite {
      position: absolute;
      z-index: 2;
      top: 0;
      left: 0;
      height: 100%;
      width: 3400%;    /*注意：这里的宽度也是小图片的数量*100%*/
      background: url(../img/whitecar.png) no-repeat center center;
      background-size: 100%;
      opacity: 0;
      -webkit-transition: opacity 0.3s;
      -moz-transition: opacity 0.3s;
      transition: opacity 0.3s;
    }
    .cd-product-viewer-wrapper.loaded .product-sprite {
      opacity: 1;
      cursor: ew-resize;
    }

main.js

jQuery(document).ready(function($){
    
    	var productViewer = function(element) {
    		this.element = element;
    		this.handleContainer = this.element.find('.cd-product-viewer-handle');
    		this.handleFill = this.handleContainer.children('.fill');
    		this.handle = this.handleContainer.children('.handle');
    		this.imageWrapper = this.element.find('.product-viewer');
    		this.slideShow = this.imageWrapper.children('.product-sprite');
    		this.frames = this.element.data('frame');
    		//increase this value to increase the friction while dragging on the image - it has to be bigger than zero
    		this.friction = this.element.data('friction');
    		this.visibleFrame = 0;
    		this.loaded = false;
    		this.animating = false;
    		this.xPosition = 0;
    		this.loadFrames();
    	} 
    
    	productViewer.prototype.loadFrames = function() {
    		var self = this,
    			imageUrl = this.slideShow.data('image'),
    			newImg = $('<img/>');
    		this.loading('0.5');
    		//you need this to check if the image sprite has been loaded
    		newImg.attr('src', imageUrl).load(function() {
    			$(this).remove();
      			self.loaded = true;
      		}).each(function(){
      			image = this;
    			if(image.complete) {
    		    	$(image).trigger('load');
    		  	}
    		});
    	}
    
    	productViewer.prototype.loading = function(percentage) {
    		var self = this;
    		transformElement(this.handleFill, 'scaleX('+ percentage +')');
    		setTimeout(function(){
    			if( self.loaded ){
    				//sprite image has been loaded
    				self.element.addClass('loaded');
    				transformElement(self.handleFill, 'scaleX(1)');
    				self.dragImage();
    				if(self.handle) self.dragHandle();
    			} else {
    				//sprite image has not been loaded - increase self.handleFill scale value
    				var newPercentage = parseFloat(percentage) + .1;
    				if ( newPercentage < 1 ) {
    					self.loading(newPercentage);
    				} else {
    					self.loading(parseFloat(percentage));
    				}
    			}
    		}, 500);
    	}
    	//draggable funtionality - credits to http://css-tricks.com/snippets/jquery/draggable-without-jquery-ui/
    	productViewer.prototype.dragHandle = function() {
    		//implement handle draggability
    		var self = this;
    		self.handle.on('mousedown vmousedown', function (e) {
    			//console.log("dragHandle")
    	        self.handle.addClass('cd-draggable');
    	        var dragWidth = self.handle.outerWidth(),
    	            containerOffset = self.handleContainer.offset().left,
    	            containerWidth = self.handleContainer.outerWidth(),
    	            minLeft = containerOffset - dragWidth/2,
    	            maxLeft = containerOffset + containerWidth - dragWidth/2;
    
    	        self.xPosition = self.handle.offset().left + dragWidth - e.pageX;
    
    	        self.element.on('mousemove vmousemove', function (e) {
    	        	if( !self.animating) {
    	        		self.animating =  true;
    		        	( !window.requestAnimationFrame )
    		        		? setTimeout(function(){self.animateDraggedHandle(e, dragWidth, containerOffset, containerWidth, minLeft, maxLeft);}, 100)
    		        		: requestAnimationFrame(function(){self.animateDraggedHandle(e, dragWidth, containerOffset, containerWidth, minLeft, maxLeft);});
    	        	}
    	        }).one('mouseup vmouseup', function (e) {
    	            self.handle.removeClass('cd-draggable');
    	            self.element.off('mousemove vmousemove');
    	        });
    
    	        e.preventDefault();
    
    	    }).on('mouseup vmouseup', function (e) {
    	        self.handle.removeClass('cd-draggable');
    	    });
    	}
    
    	productViewer.prototype.animateDraggedHandle = function(e, dragWidth, containerOffset, containerWidth, minLeft, maxLeft) {
    		// console.log("animateDraggedHandle")
    		var self = this;
    		var leftValue = e.pageX + self.xPosition - dragWidth;
    	    // constrain the draggable element to move inside his container
    	    if (leftValue < minLeft) {
    	        leftValue = minLeft;
    	    } else if (leftValue > maxLeft) {
    	        leftValue = maxLeft;
    	    }
    
    	    var widthValue = Math.ceil( (leftValue + dragWidth / 2 - containerOffset) * 1000 / containerWidth)/10;
    	    self.visibleFrame = Math.ceil( (widthValue * (self.frames-1))/100 );
    
    	    //update image frame
    	    self.updateFrame();
    	    //update handle position
    	    $('.cd-draggable', self.handleContainer).css('left', widthValue + '%').one('mouseup vmouseup', function () {
    	        $(this).removeClass('cd-draggable');
    	    });
    
    	    self.animating = false;
    	}
    
    	productViewer.prototype.dragImage = function() {
    		//implement image draggability
    		var self = this;
    		self.slideShow.on('mousedown vmousedown', function (e) {
    	        self.slideShow.addClass('cd-draggable');
    	        var containerOffset = self.imageWrapper.offset().left,
    	            containerWidth = self.imageWrapper.outerWidth(),
    	            minFrame = 0,
    				maxFrame = self.frames - 1;
    
    	        self.xPosition = e.pageX;
    
    	        self.element.on('mousemove vmousemove', function (e) {
    	        	if( !self.animating) {
    	        		self.animating =  true;
    		        	( !window.requestAnimationFrame )
    		        		? setTimeout(function(){self.animateDraggedImage(e, containerOffset, containerWidth);}, 100)
    		        		: requestAnimationFrame(function(){self.animateDraggedImage(e, containerOffset, containerWidth);});
    		        }
    	        }).one('mouseup vmouseup', function (e) {
    	            self.slideShow.removeClass('cd-draggable');
    	            self.element.off('mousemove vmousemove');
    	            self.updateHandle();
    	        });
    
    	        e.preventDefault();
    
    	    }).on('mouseup vmouseup', function (e) {
    	        self.slideShow.removeClass('cd-draggable');
    	    });
    	}
    
    	productViewer.prototype.animateDraggedImage = function(e, containerOffset, containerWidth) {
    		var self = this;
    		var leftValue = self.xPosition - e.pageX;
            var widthValue = Math.ceil( (leftValue) * 100 / ( containerWidth * self.friction ));
    		var frame = (widthValue * (self.frames-1))/100;
            if( frame > 0 ) {
            	frame = Math.floor(frame);
            } else {
            	frame = Math.ceil(frame);
    		}
    
            var newFrame = self.visibleFrame + frame;
    
            if (newFrame < 0) {
                newFrame = self.frames - 1;
            } else if (newFrame > self.frames - 1) {
                newFrame = 0;
            }
    		
    		if (newFrame == 0 || newFrame == 15){
    			console.log(newFrame,"yes")
    		}
            if( newFrame != self.visibleFrame ) {
            	self.visibleFrame = newFrame;
            	self.updateFrame();
            	self.xPosition = e.pageX;
            }
    
            self.animating =  false;
    	}
    
    	productViewer.prototype.updateHandle = function() {
    		if(this.handle) {
    			var widthValue = 100*this.visibleFrame/this.frames;
    			this.handle.animate({'left': widthValue + '%'}, 0);//进度条更新延迟
    		}
    	}
    
    	productViewer.prototype.updateFrame = function() {
    		var transformValue = - (100 * this.visibleFrame/this.frames);
    		console.log("1111",transformValue)
    		// if(-93.75<transformValue && transformValue<-0){
    			transformElement(this.slideShow, 'translateX('+transformValue+'%)');
    		// }
    	}
    
    	function transformElement(element, value) {
    		element.css({
    			'-moz-transform': value,
    		    '-webkit-transform': value,
    			'-ms-transform': value,
    			'-o-transform': value,
    			'transform': value,
    		});
    	}
    
    	var productToursWrapper = $('.cd-product-viewer-wrapper');
    	productToursWrapper.each(function(){
    		new productViewer($(this));
    	});
    });

[H5_360_1]: https://blog.csdn.net/qq_41787619/article/details/95175819
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNzg3NjE5_size_16_color_FFFFFF_t_70]: /images/20211211/acab581bfd8547e4a2f7ffc4b30345e0.png
[20190709115838635.png]: /images/20211211/400803ea5ff046169694414214638e24.png