Shape.js

'use strict';

class Shape{
    constructor(width, height, tip){
        this._points = [];
        this._points.push('0,0');
        this._points.push(width + ',0');
        this._points.push(width + tip + ',' + (height / 2));
        this._points.push(width + ',' + height);
        this._points.push('0,' + height);
    }

    get coordinates(){
        return this._points;
    }
}

class RootShape extends Shape{
    constructor(width, height, tip){
        super(width, height, tip);
        super.coordinates.push(tip + ',' + height/2);
    }

    get coordinates(){
        return super.coordinates;
    }
}

//Commenting out ES6 export for the time being as Node is yet to support it
//export {Shape, RootShape};