Conventions

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "Define the Events constructor."

A block of code is set as follows:

var Events = function(canvasId){
    this.canvas = document.getElementById(canvasId);
    this.context = this.canvas.getContext("2d");
    this.stage = undefined;
    this.listening = false;
};

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

var Events = function(canvasId){
 this.canvas = document.getElementById(canvasId);
 this.context = this.canvas.getContext("2d");
    this.stage = undefined;
    this.listening = false;
};

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "It writes out the text Hello Logo! at the origin."