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DarkBASIC Professional Discussion / Why do I need a double sync ?

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Trev C
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Joined: 18th Feb 2003
Location: United Kingdom
Posted: 28th Apr 2003 13:09
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Hi,

Can someone look at this code (source button) and tell me why I need to do two sync statements to get the text to appear?

The screen stays blank if I only have the one sync statement, but if I put in the second it displays what I am expecting.

Any ideas? or is it a bug with DBPro?

cheers,
Trev C
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AtomR
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Posted: 28th Apr 2003 13:26 Edited at: 28th Apr 2003 13:27
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:-s

Here, It doesn't display anyway.

Take care
AtomR
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Nilrem
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Posted: 28th Apr 2003 13:58
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I'm not sure, but I think it's because you have to update the information that's just been (sync on etc) and the information after (printing to the screen etc) so you can put the sync just after the else statement, and leave the other sync where it is, that way if I am correct in what I believe (doubt it) your code is easier to read.

I hear and I forget. I see and I remember. I do and I understand.
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Trev C
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Posted: 28th Apr 2003 14:43
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AtomR: Now try and delete the REM statement away from the second Sync command and run it again. The text then appears. I'm assuming you left it in, which is why you say it didn't work.

The example shows you what I am talking about, with one sync I get a blank screen, two sync's and you get the text?

Is it not correct that in theory the single Sync should force a screen refresh, hence updating the display to show the new printed text?

I have something similar in my Asteroids clone which I ported from DBC. After the game finishes in DBPro I need to do a double sync to get the 'game over' screen to display correctly.

I suspect this problem is also causing bugs with the main game loop too.

Trev C
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roswell
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Posted: 28th Apr 2003 16:34
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Actually, it looks like you only need the sync once. I ran this code as you have it and it worked just like you said -- the text wouldn't appear without the second sync. However, I took the second sync out and re-ran the code. While I was looking at the blank screen, I reselected your program in windows using Alt-Tab. After re-selecting the program, the text appeared. Why it did this, I have no idea, but that could explain a few things for me as well.

/* You are not expected to understand this. */

Dual Athlon 2.0/1GB RAM/GeForce Ti4200-128/Win2000 Pro
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CloseToPerfect
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Posted: 29th Apr 2003 03:44
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Your using patch 4 arn't you? Using patch 3.1 it works fine, for some reason patch 4 screwed up something with print and text commands.

CTP

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Easily Confused
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Posted: 29th Apr 2003 03:53
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Should be corrected in Patch 5, well I hope

Programming anything is an art, and you can't rush art.
Unless your name is Bob Ross, then you can do it in thirty minutes.
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Trev C
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Posted: 29th Apr 2003 13:02
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Ah, that explains it all, yet another Patch 4 feature :-s

They'll get it right one day

Trev C
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