Hi guys, first of all please forgive me, I’m a noob… I’m trying to get an enemy to fly down from the top right hand side of the screen, to the left, bounce off of the ground and fly back up off somewhere on the left side of the screen. I have tried many versions of the following conditional statement, but I can’t quite seem to get it right. Not sure if my rudimentary logic skills are faulty or if something else is going on:
-- A really long chunk of code
function update(self, dt)
local p = go.get_position()
-- x stuff...
if p.x < -500 then -- this is related to spawning this object from a factory
msg.post("/level/controller#script", "delete_bugs", { id = go.get_id() })
end
p.x = p.x - speed * dt
go.set_position(p)
-- y stuff...
local down = true -- start by moving down
local top_limit = 700
local bottom_limit = 100
if down then
p.y = p.y - speed * dt
go.set_position(p)
if p.y <= bottom_limit then
down = false
--print(p.y)
--print(down)
end
end
if not down then
print("p.y before new velocity:", p.y)
p.y = p.y + speed * dt
go.set_position(p)
print("p.y after new velocity:", p.y)
if p.y >= top_limit then
down = true
print(down)
print(p.y)
end
end
end -- end of really long chunk of code
In this particular version, the enemy drops on an angle from the top right hand side of the screen, hits the ground and just stays at that level, floating across to the left hand side of the screen. The system seems to be reaching the “if not down” statement, at which point p.y = 99.999855041504 and then after the “p.y = p.y + speed * dt” line is executed p.y = 113.33319091797, but like I say it just stays there. I would expect that p.y would keep increasing until we hit the top_limit. Any input would be greatly appreciated. Thanks.
