Figuring out the geometry
The CCDrawNode class provides just three functions. These functions are drawDot, drawSegment, and drawPolygon, which enable you to draw a color-filled circle, a color-filled segment, and a color-filled polygon with a separate border, respectively. We will write a simple yet extremely resourceful function to help us with the generation of vertices for our game elements. However, before we write this utilitarian function, let's take a closer look at each element and the vertices they contain:
|
Game element |
Visual |
Visual with vertices |
|---|---|---|
|
Player |
 |
 |
|
Enemy |
 |
 |
|
Shield |
 |
 |
|
Bomb |
 |
 |
|
Missile launcher |
 |
 |
I have highlighted the vertices on each of these shapes to underline a basic geometrical object that we will use to our advantage in this game—the regular polygon. As most of you may know, a regular polygon is a polygon that is equiangular and equilateral. The interesting thing about a regular polygon is that we can use the parametric equation of a circle...
