This appendix will cover some of the math concepts used in Chapter 5, On the Line – Rocket Through, in a little more detail.
First, let's do a quick refresh on vectors and the way you can use Cocos2d-x to deal with them.
So what is the difference between a vector and a point? At first, they seem to be the same. Consider the following point and vector:
The following figure illustrates a point and a vector:
In this figure, they each have the same value for x and y. So what's the difference?
With a vector, you always have extra information. It is as if, besides those ...