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  • mTween运动函数以及tween运动方式函数

    mTween运动函数

    //obj运动对象
    //attr运动元素
    //target运动目标点
    //duration 运动时间
    //fx 运动方式
    //callBack回调函数
    
    function mTween(obj,attr,target,duration,fx,callBack){
    	//获取起始位置
    	var begin = parseFloat(getComputedStyle(obj)[attr]);
    	//算出总距离
    	var count = target - begin;
    	//var time = new Date().getTime();
    	//记录时间
    	var time = +new Date();
    	//防止定时器冲突,所以每次开启先清除。
    	clearInterval(obj[attr])
    	obj[attr] = setInterval(function(){
    		//获取已过去的时间
    		var t = +new Date() - time ;
    		// console.log(1);
    		//已过去时间超出总时间代表运动结束
    		if(t>=duration){
    			t = duration;
    			//清除定时器
    			clearInterval(obj[attr]);
    			
    		}
    		//var value = count*t/duration + begin;
    		//根据传入的运动方式算出obj应该运动的值
    		var value = Tween[fx](t,begin,count,duration);
    		
    		obj.style[attr] = value + 'px';
    		
    		if(t == duration){
    			//如果有回调函数就执行回调
    			callBack&&callBack();
    		}
    	},16)
    }
    

    tween运动方式函数

    /*
    * t : time 已过时间
    * b : begin 起始值
    * c : count 总的运动值
    * d : duration 持续时间
    *
    * 曲线方程
    *
    * http://www.cnblogs.com/bluedream2009/archive/2010/06/19/1760909.html
    * */
    
    //Tween.linear();
    
    var Tween = {
    	linear: function (t, b, c, d){  //匀速
    		return c*t/d + b;
    	},
    	easeIn: function(t, b, c, d){  //加速曲线
    		return c*(t/=d)*t + b;
    	},
    	easeOut: function(t, b, c, d){  //减速曲线
    		return -c *(t/=d)*(t-2) + b;
    	},
    	easeBoth: function(t, b, c, d){  //加速减速曲线
    		if ((t/=d/2) < 1) {
    			return c/2*t*t + b;
    		}
    		return -c/2 * ((--t)*(t-2) - 1) + b;
    	},
    	easeInStrong: function(t, b, c, d){  //加加速曲线
    		return c*(t/=d)*t*t*t + b;
    	},
    	easeOutStrong: function(t, b, c, d){  //减减速曲线
    		return -c * ((t=t/d-1)*t*t*t - 1) + b;
    	},
    	easeBothStrong: function(t, b, c, d){  //加加速减减速曲线
    		if ((t/=d/2) < 1) {
    			return c/2*t*t*t*t + b;
    		}
    		return -c/2 * ((t-=2)*t*t*t - 2) + b;
    	},
    	elasticIn: function(t, b, c, d, a, p){  //正弦衰减曲线(弹动渐入)
    		if (t === 0) { 
    			return b; 
    		}
    		if ( (t /= d) == 1 ) {
    			return b+c; 
    		}
    		if (!p) {
    			p=d*0.3; 
    		}
    		if (!a || a < Math.abs(c)) {
    			a = c; 
    			var s = p/4;
    		} else {
    			var s = p/(2*Math.PI) * Math.asin (c/a);
    		}
    		return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    	},
    	elasticOut: function(t, b, c, d, a, p){    //*正弦增强曲线(弹动渐出)
    		if (t === 0) {
    			return b;
    		}
    		if ( (t /= d) == 1 ) {
    			return b+c;
    		}
    		if (!p) {
    			p=d*0.3;
    		}
    		if (!a || a < Math.abs(c)) {
    			a = c;
    			var s = p / 4;
    		} else {
    			var s = p/(2*Math.PI) * Math.asin (c/a);
    		}
    		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
    	},    
    	elasticBoth: function(t, b, c, d, a, p){
    		if (t === 0) {
    			return b;
    		}
    		if ( (t /= d/2) == 2 ) {
    			return b+c;
    		}
    		if (!p) {
    			p = d*(0.3*1.5);
    		}
    		if ( !a || a < Math.abs(c) ) {
    			a = c; 
    			var s = p/4;
    		}
    		else {
    			var s = p/(2*Math.PI) * Math.asin (c/a);
    		}
    		if (t < 1) {
    			return - 0.5*(a*Math.pow(2,10*(t-=1)) * 
    					Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    		}
    		return a*Math.pow(2,-10*(t-=1)) * 
    				Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;
    	},
    	backIn: function(t, b, c, d, s){     //回退加速(回退渐入)
    		if (typeof s == 'undefined') {
    		   s = 1.70158;
    		}
    		return c*(t/=d)*t*((s+1)*t - s) + b;
    	},
    	backOut: function(t, b, c, d, s){
    		if (typeof s == 'undefined') {
    			s = 3.70158;  //回缩的距离
    		}
    		return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
    	}, 
    	backBoth: function(t, b, c, d, s){
    		if (typeof s == 'undefined') {
    			s = 1.70158; 
    		}
    		if ((t /= d/2 ) < 1) {
    			return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
    		}
    		return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
    	},
    	bounceIn: function(t, b, c, d){    //弹球减振(弹球渐出)
    		return c - Tween['bounceOut'](d-t, 0, c, d) + b;
    	},       
    	bounceOut: function(t, b, c, d){//*
    		if ((t/=d) < (1/2.75)) {
    			return c*(7.5625*t*t) + b;
    		} else if (t < (2/2.75)) {
    			return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
    		} else if (t < (2.5/2.75)) {
    			return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
    		}
    		return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
    	},      
    	bounceBoth: function(t, b, c, d){
    		if (t < d/2) {
    			return Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b;
    		}
    		return Tween['bounceOut'](t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
    	}
    }
    

      

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  • 原文地址:https://www.cnblogs.com/yangxue72/p/7992275.html
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