frontend101/design pattern/strategy pattern/index.html at master · hkjpotato/frontend101 · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: #f5f5f5;
  color: #4d4d4d;
  font-weight: 300;
}

#ball {
	width: 50px;
	height: 50px;
	border-radius: 50%;
	background-color: lightgrey;
	position: absolute;
}
</style>
<body>
<div id="ball"></div>
<script type="text/javascript">

var div = document.getElementById("ball");


//t = time, b = begin, c = change, d = duration
var linear = function(t, b, c, d) {
	return c * t / d + b;
}

var easeIn = function(t, b, c, d) {
	return c * (t /= d) * t + b;
}

var strongEaseIn = function(t, b, c, d) {
	return c * (t /= d ) * t * t * t * t + b;
}

var strongEaseOut = function(t, b, c, d) {
	return c * ((t = t/d - 1) * t * t * t * t + 1) + b;
}

var sineaseIn = function(t, b, c, d) {
	return c * (t /= d) * t * t + b;
}


var sineaseOut = function(t, b, c, d) {
	return c * ((t = t/d - 1) * t * t + 1) + b;
}

var tween = {
	linear: linear,
	easeIn: easeIn,
	strongEaseIn: strongEaseIn,
	strongEaseOut: strongEaseOut,
	sineaseIn: sineaseIn,
	sineaseOut: sineaseOut
}


var Animate = function(dom) {
	this.dom = dom;
	this.startTime = 0;
	this.startPos = 0;
	this.endPos = 0;
	this.propertName = null;
	this.easing = null;
	this.duration = null;
}

Animate.prototype.start = function(propertName, endPos, duration, easing) {
	this.startTime = +new Date;
	this.startPos = this.dom.getBoundingClientRect()[propertName];
	this.propertName = propertName;
	this.endPos = endPos;
	this.duration = duration;
	this.easing = tween[easing];

	//similar to while loop
	var timeId = setInterval(function() {
		if (this.step() === false) {
			clearInterval(timeId);
		}
	}.bind(this), 19);
}

Animate.prototype.step = function() {
	var t = +new Date();
	if (t > this.startTime + this.duration) {
		this.update(this.endPos);
		return false;
	}

	var pos = this.easing(t - this.startTime, this.startPos, this. endPos - this.startPos, this.duration);

	this.update(pos);
}

Animate.prototype.update = function(pos) {
	this.dom.style[this.propertName] = pos + "px";
}

Animate.prototype.startRAF = function(propertName, endPos, duration, easing) {
	this.startTime = +new Date;
	this.startPos = this.dom.getBoundingClientRect()[propertName];
	this.propertName = propertName;
	this.endPos = endPos;
	this.duration = duration;
	this.easing = tween[easing];
	this.paintByStep();
}

Animate.prototype.paintByStep = function() {
	var t = + new Date();
	if (t > this.startTime + this.duration) {
		this.update(this.endPos);
		return false;
	} else {
		var pos = this.easing(t - this.startTime, this.startPos, this. endPos - this.startPos, this.duration);
		this.update(pos);
		requestAnimationFrame(this.paintByStep.bind(this));
	}
}


var animate = new Animate(div);

animate.startRAF("left", 500, 1000, "strongEaseOut");


</script>
<script type="text/javascript">
// var GetRegularGasPrice = function() {}
// GetRegularGasPrice.prototype.calculate = function(gallons) {
// 	return gallons * 1.9;
// }

// var GetMidgradeGasPrice = function() {}
// GetMidgradeGasPrice.prototype.calculate = function(gallons) {
// 	return gallons * 2.3;
// }

// var GetPremiumGasPrice = function() {}
// GetPremiumGasPrice.prototype.calculate = function(gallons) {
// 	return gallons * 2.9;
// }

// var GetDieselGasPrice = function() {}
// GetDieselGasPrice.prototype.calculate = function(gallons) {
// 	return gallons * 2.1;
// }

// var GasCalculator = function() {
// 	this.gallons = 0;
// 	this.strategy = null;
// }
// GasCalculator.prototype.setGallons = function(gallons) {
// 	this.gallons = gallons;
// }

// GasCalculator.prototype.setStrategy = function(strategy) {
// 	this.strategy = strategy;
// }

// GasCalculator.prototype.getPrice = function() {
// 	return this.strategy.calculate(this.gallons);
// }


// var gasCalculator = new GasCalculator();
// gasCalculator.setGallons(10);
// gasCalculator.setStrategy(new GetRegularGasPrice());

// console.log(gasCalculator.getPrice());
</script>