From 95b763556ea65f25efe93fce8607747609a9b5e2 Mon Sep 17 00:00:00 2001
From: Vasilii <kuznecov_vasilii@.mail.ru>
Date: Thu, 2 Oct 2014 15:34:19 +0600
Subject: [PATCH] Home work: traffic light + tram

---
 trafficlight.htm | 119 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 trafficlight.htm
diff --git a/trafficlight.htm b/trafficlight.htm
new file mode 100644
index 0000000..760f71f
--- /dev/null
+++ b/trafficlight.htm
@@ -0,0 +1,119 @@
+<!doctype html>
+<html>
+	<head>
+		<title>
+			Светофор
+		</title>
+	</head>
+	<body>
+		<script type="text/javascript">
+			
+function TrafficLight(config) {
+	this.greenTime = config.greenTime;
+	this.yellowTime = config.yellowTime;
+	this.redTime = config.redTime;
+	this.timeoutID = null;
+	this.switchDate = null;
+	this._state = null;
+	this.tram = false;
+								
+	TrafficLight.prototype.state = function() {
+		return (this.tram)?"green":this._state;
+	};
+				
+	TrafficLight.prototype.toRed = function() {
+		clearTimeout(this.timeoutID);
+		this._state = "red";
+		this.switchDate = new Date();
+		this.timeoutID = setTimeout(function() {this.toGreen();}.bind(this), this.redTime*1000);
+	};
+				
+	TrafficLight.prototype.toGreen = function() {
+		clearTimeout(this.timeoutID);
+		this._state = "green";
+		this.switchDate = new Date();
+		this.timeoutID = setTimeout(function() {this.toYellow();}.bind(this), this.greenTime*1000);
+	};
+				
+	TrafficLight.prototype.toYellow = function() {
+		clearTimeout(this.timeoutID);
+		this._state = "yellow";
+		this.switchDate = new Date();
+		this.timeoutID = setTimeout(function() {this.toRed();}.bind(this), this.yellowTime*1000);
+	};
+	
+	TrafficLight.prototype.letTramGo = function() {
+		setTimeout(function() {
+			this.tram = true;
+			setTimeout(function() {
+				this.tram = false;
+				if (this.switchDate - new Date() > 0.8*this[this._state + "Time"]) {
+					switch (this._state) {
+						case "green":
+							this.toYellow();
+							break;
+						case "yellow":
+							this.toRed();
+							break;
+						case "red":
+							this.toGreen();
+							break;
+					}
+				}
+			}.bind(this),10000);
+		}.bind(this),3000);
+	}
+
+	TrafficLight.prototype.subscribeTram = function(event) {
+		event.addListener(function() {this.letTramGo();}.bind(this));
+	}
+		
+}
+
+function tramEvent() {
+	this.listeners=[];
+	tramEvent.prototype.addListener = function(func) {
+		this.listeners.push(func);
+	}
+	tramEvent.prototype.removeListener = function(func) {
+		for(var i=0; i<this.listeners.length ; i++) {
+			if (this.listeners[i] === func) {
+				this.listeners.splice(i,1);
+			}			
+		}
+	}
+	tramEvent.prototype.emit = function() {
+		for(var i=0; i<this.listeners.length ; i++) {
+			setTimeout(this.listeners[i],0);	
+		}
+	}
+
+}
+
+var config = {
+	greenTime:	6,
+	yellowTime:	2,
+	redTime:	6
+}
+
+var trafficLight = new TrafficLight(config);
+var tram = new tramEvent();
+trafficLight.subscribeTram(tram);
+trafficLight.toGreen();
+
+/*setInterval(function() {alert("now is " + trafficLight.state());}, 2000); 
+
+setTimeout(function() {
+	tram.emit(); 
+	alert("tram is coming...");
+	setTimeout(function() {
+		alert("tram!");
+	},3000);
+	setTimeout(function() {
+		alert("tram passed");
+	},13000);
+}, 10000);
+*/			
+		</script>
+	</body>
+</html>
\ No newline at end of file
