CLEAN camera transitions x,y to x,y

[Tomfloria]

I've just read through your code Aino, and pasted it straight into my level 1 copying everything (I've made a backup) and it starts, I had to take the globals out though cause it's different for iPad, when loading it up nothing happens, but then I added a few SetCameraTarget(10000,10000) just to test, but nothing happens....

I also changed the

Code: [Select]

CameraStart = {x = 0, y = 0};
to

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CameraStart = {x = 10000, y = 0};
And it starts up at 0,0 It's got to be an iPad Limitation.

[annikk.exe]

Code: [Select]

function LevelSetup()


-- some random globals..  can't remember what I all need...
Globals.G.Asteroids=(0)
Globals.G.EnemyFactionsMin=(0)
Globals.G.EnemyFactionsMax=(0)
Globals.G.MinAsteroidSeparation=500
Globals.G.MaxAsteroidNeighbourDist=3500
Globals.G.StartingSeedlings=(10)
Globals.G.GreysProbability=0

-- add some asteroids... a start roid
a = AddAsteroidWithAttribs(0,0, 1,1,1)
a.Name = "Start"
a.Owner = 1
s = a:AddDysonTree()

-- and a destination roid... we need some roids so we can
--  have some kind of fixed, known frame of reference to
-- test the transition effect..
a = AddAsteroidWithAttribs(2000,-1000, 1,1,1)
a.Name = "Destination"
a.Owner = 1
s = a:AddDysonTree()

end

function LevelLogic()

-- initialise variables
startTransition = true
p = 0
camX = GetCameraX()
camY = GetCameraY()

startX = camX
startY = camY
destX = 2000
destY = -1000

-- begin shenanigans

while GameRunning() do

-- Hallo !  Is this the start?  Are we transitioning ?
if startTransition then

-- if we are, start incrementing the counter...
p = p + 0.02

-- if we've reached the end of the transition..
if (p > 1) then

-- set p to a nice round 1, and flip the latch so the base conditional will no longer trigger.
p = 1
startTransition = false

end

-- time to set the camera distance.
-- camera position = start coordinate + ((destination coordinate - start coordinate) * the counter)
camX = startX + ((destX - startX) * p)
camY = startY + ((destY - startY) * p)

-- set the camera to the newly calculated coordinates
SetCameraPosition(camX, camY)

end
  
coroutine.yield()
end


end
Here is code for a complete working level with the screen transition thing.
Does this work for you?

[annikk.exe]

Also, get the basic one working first before you dive into the math.sin stuff !

On that, I've since found out that my assumption that the average Y value of the sine line where 0 < X < math.pi() is not 0.5... it's actually about 0.67 or something, or more accurately, 2 / math.pi().
So that means my code for the smoothed transition is wrong. :>  It will work kind of, but it will either overshoot the intended coordinates, or fall some way short.... I'm not quite sure which.  In any case, I will see about fixing that at some point...

[Tomfloria]

:O it works

[annikk.exe]

The problem I found with the code I copied largely verbatim from your original post, was that you wrote:

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while gamerunning() do

instead of

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while GameRunning() do


It turned out it didn't even favour the incorrect bracket precendence in the maths, so this was the only problem all along.

Nice thread it spawned though.. :>

[annikk.exe]

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    camX = startX + (((destX - startX) / steps) * (math.sin(p) / (2 / math.pi())))
    camY = startY + (((destY - startY) / steps) * (math.sin(p) / (2 / math.pi())))

This... I think...  maybe..
It needs the other supporting code too I guess.

I try it :>

[Tomfloria]

Just check this though, I don't just want one camera position, I want one, then something, then another.

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-- initialise variables
    startTransition = true
    p = 0
    camX = GetCameraX()
    camY = GetCameraY()

    startX = camX
    startY = camY
    destX = 2000
    destY = -1000

WaitReal(3)
destX = 0
    destY = 0
the only thing I added to the whole file you added me was

Code: [Select]

WaitReal(3)
destX = 0
    destY = 0
and thats stopped the transition working, even for the first one.

[annikk.exe]

Heh, doesn't work.

Back to conceptual stuff I guess.





Anyways...

Just check this though, I don't just want one camera position, I want one, then something, then another.

Code: [Select]

-- initialise variables
    startTransition = true
    p = 0
    camX = GetCameraX()
    camY = GetCameraY()

    startX = camX
    startY = camY
    destX = 2000
    destY = -1000

WaitReal(3)
destX = 0
    destY = 0
the only thing I added to the whole file you added me was

Code: [Select]

WaitReal(3)
destX = 0
    destY = 0
and thats stopped the transition working, even for the first one.

Because you haven't defined a function called WaitReal(), perhaps?

[annikk.exe]

Add this in at the very very bottom of the level file:

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function WaitReal(number)
MessageBox(number)
end

Then it will work, because the WaitReal function has been defined.  Not sure what you wanted it to do exactly, but currently it will produce a messagebox containing the number 3!

[Tomfloria]

In the iOS version it's already defined in support.lua which defines many functions

[annikk.exe]

Never heard of it :>

I'd recommend testing the gametime instead to find out if it's time to transition or not.

[annikk.exe]

For example:

Code: [Select]

function LevelSetup()


-- some random globals..  can't remember what I all need...
Globals.G.Asteroids=(0)
Globals.G.EnemyFactionsMin=(0)
Globals.G.EnemyFactionsMax=(0)
Globals.G.MinAsteroidSeparation=500
Globals.G.MaxAsteroidNeighbourDist=3500
Globals.G.StartingSeedlings=(10)
Globals.G.GreysProbability=0

-- add some asteroids... a start roid
a = AddAsteroidWithAttribs(0,0, 1,1,1)
a.Name = "Start"
a.Owner = 1
s = a:AddDysonTree()

-- and a destination roid... we need some roids so we can
--  have some kind of fixed, known frame of reference to
-- test the transition effect..
a = AddAsteroidWithAttribs(2000,-1000, 1,1,1)
a.Name = "Destination"
a.Owner = 1
s = a:AddDysonTree()

end

function LevelLogic()

-- initialise variables
    startTransition = true
    p = 0
    camX = GetCameraX()
    camY = GetCameraY()

    startX = camX
    startY = camY
    destX = 2000
    destY = -1000

-- begin shenanigans

while GameRunning() do


-- Hallo !  Is this the start?  Are we transitioning ?
if startTransition == true and GetGameTime() > 3 then

-- if we are, start incrementing the counter...
p = p + 0.02

-- if we've reached the end of the transition..
if (p > 1) then

-- set p to a nice round 1, and flip the latch so the base conditional will no longer trigger.
p = 1
startTransition = false

end

-- time to set the camera distance.
-- camera position = start coordinate + ((destination coordinate - start coordinate) * the counter)
camX = startX + ((destX - startX) * p)
camY = startY + ((destY - startY) * p)

-- set the camera to the newly calculated coordinates
SetCameraPosition(camX, camY)

   end
  
coroutine.yield()
    end


end
Again, fully working level.


The only change I needed to make was this line:

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if startTransition then

I changed it to this:

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if startTransition == true and GetGameTime() > 3 then

if startTransition and if startTransition == true are the same, I just prefer the latter because I think it's clearer. :>

[Tomfloria]

WaitReal(1) would be wait 1 game time second

[annikk.exe]

Well you've told me that the level doesn't work if you use the WaitReal command, so as above, my suggestion is to find a different way to implement the delay. :>

[Tomfloria]

What I'm going to do, is focus on getting the levels done, and then when there done ill do the extra sexy bits like this, Thanks Annikk!