TypeScript: Mouse Odometer

gistfile1.coffee

class MultiVector {
	values: number[];
	size: number;
	constructor(values: number[], size: number) {
		this.values = values;
		this.size = size;		
	}	
	distance(previous : MultiVector): number {
		var temp = 0; 
		for (var i:number = 0; i< this.size; i++){
			var itemElement = this.values[i] - previous.values[i];			
			temp += itemElement * itemElement;  			
		}
		return 	Math.sqrt(temp);	
	};
}

class MouseOdometer {
	display : any;
	distance : number;
	lastPoint : MultiVector;
	constructor() {
		this.display = document.createElement("div");
		this.display.innerText = "0"
		this.distance = 0;
		document.body.appendChild(this.display);		
		window.onmousemove = e=> {
			var newPoint = new MultiVector([e.clientX, e.clientY], 2);
			this.distance += newPoint.distance(this.lastPoint || new MultiVector([0,0], 2));						
			this.lastPoint = newPoint;
			this.display.innerText = this.distance.toString(); 
		}				
		
	}	
}
var x = new MouseOdometer();