Tuto tiny-ecs 2d platformer Part 6 ECS Components
Components
As we have seen in the previous chapter, components are abilities we add to an Entity. Entities can and will share the same components.
Let's continue adding abilities to our player1.
BODY
The Body Component adds an Entity the ability to move both on the x and y axis. You can create a file called "cBody.lua" in the "_C" folder. The code:
CBody = Core.class()
function CBody:init(xmass, xspeed, xupspeed, xextra)
-- body physics properties
self.mass = xmass or 1
self.currmass = self.mass
self.vx = 0
self.vy = 0
self.speed = xspeed
self.currspeed = self.speed
self.upspeed = xupspeed
self.currupspeed = self.upspeed
if xextra then
self.inputbuffer = 1*8 -- 1*8, 2*8
self.currinputbuffer = self.inputbuffer
self.coyotetimer = 1.65*8 -- 1.5*8, 2*8, 12
self.currcoyotetimer = self.coyotetimer
self.jumpcount = 1 -- 2
self.currjumpcount = self.jumpcount
self.candash = true -- true, false XXX
self.dashtimer = 1*8 -- 1*8 -- 0.5*8
self.currdashtimer = self.dashtimer
self.dashmultiplier = 1.5 -- 1.5
self.dashcooldown = 4*8 -- 4*8, cooldown before performing another dash
self.currdashcooldown = self.dashcooldown
end
end
The CBody:init function signature has four parameters: the body mass, the speed on the x axis, the upspeed on the y axis and the extra body variables.
note: some entities will have a body but without the extra parameters, for example a moving platform
Components are usually small pieces of code, which is nice!
COLLISION BOX
The CollisionBox Component adds an Entity a collision box. You can create a file called "cCollisionBox.lua" in the "_C" folder. The code:
CCollisionBox = Core.class()
function CCollisionBox:init(xcollwidth, xcollheight)
self.w = xcollwidth
self.h = xcollheight
end
That's all we need to tell a System this Entity has a collision box. We store the Entity collision box width and height to be used by systems.
Shield
This is not an ECS component per se but I added some shield to the player1. I think I should have created a component for it but that will do for now.
When you press the shield action key, the shield is activated.
Next?
The player1 Entity and its components are done, now using almost the same components let's create our enemies...
Prev.: Tuto tiny-ecs 2d platformer Part 5 ePlayer1
Next: Tuto tiny-ecs 2d platformer Part 7 Enemies
Tutorial - tiny-ecs 2d platformer
