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HTML5 Canvas Apprenticeship - Part -2 - Understanding how to set canvas size

The second post in this video series gives a simple example to understand how to set canvas size.  Basically there are two ways to set the canvas size, using canvas elements properties and by using the CSS.  Watch the video to understand more.


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JavaScript - The this keyword

"this" is one of the most misunderstood construct in JavaScript.  To understand this first lets go through how to create a construction function in JavaScript.  A constructor function is a function which is used to create instances of objects in JavaScript.

You define a constructor function using the same notation that you use to define a normal JavaScript function.  The convention to follow is to capitalize the first letter of the function name.

This requirement is not enforced by the JavaScript language but it is a generally accepted practice and there are many benefits which we will shortly discuss.

Let's define a constructor function to hold our menu information.

function Menu() { }
So, in the above snippet you have a constructor function named Menu defined. At present this function doesn't do anything good.

Let's see how to invoke this function

var menu = new Menu();
Let's add some public properties to this function.
function Menu() { this.menuName = &…