I have that sync[ing] feeling - GameCreators Forum

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Tobo

19

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Joined: 12th May 2005

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Posted: 10th Sep 2011 23:46

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Dear all,

My code...

+ Code Snippet

set display mode 640,480,32

sync on

'create shape
line 30,30,45,15
line 45,15,60,30
line 45,15,45,60

'grab the image
get image 1,30,15,60,60

'use it as a sprite
sprite 1,50,50,1

paste sprite 1,100,100
'sync
text 300,200,"Fin."
sync

wait key
end

Doesn't seem to show the drawn arrow or the text, even though I have the SYNC command after them both.

However, if you take un-rem the sync above the TEXT command, it seems to work.

Can anyone tell me why please?

Many thanks.

T
(I did search first, but searching on this site is a bleedin' nightmare)

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Neuro Fuzzy

17

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Joined: 11th Jun 2007

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Posted: 11th Sep 2011 01:10

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sync is meant to be used in a loop. I think the first time it's called, it performs some setup operations. I always call "sync" right after I say "sync on".

I think a lot of people have had trouble with this before.

Why does blue text appear every time you are near?

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LBFN

17

Years of Service

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Joined: 7th Apr 2007

Location: USA

Posted: 11th Sep 2011 02:08

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Try this:

+ Code Snippet

set display mode 640,480,32

sync on : sync rate 60
hide mouse
'create shape
line 30,30,45,15
line 45,15,60,30
line 45,15,45,60

'grab the image
get image 1,30,15,60,60

'use it as a sprite
sprite 1,50,50,1

repeat
      sprite 1,mousex(),mousey(),1
      text 200,180,"mouse sprite around with the mouse"
      text 200,200,"press any mouse button to exit."
      sync
until mouseclick() > 0
text 300,200,"Fin."
sync

wait key
end

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Tobo

19

Years of Service

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Joined: 12th May 2005

Location:

Posted: 11th Sep 2011 09:26

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Thank you, both.

If SYNC does indeed do some original setup during its first execution, it would certainly explain why it's required more than once (or in a loop).

...and here's the line from the help file I'm usually so quick to criticise, "It is important to note the very first SYNC will only render the back buffer and reveal the contents of that buffer on the second SYNC command, as the system is based on a double buffered refresh."

This makes perfect sense.

Thanks again.

T

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