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 10-14-2003 14:38
Posted by:
Miles
Location:
Australia
 
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Ok I'm not sure if this is a problem with TNT or it's just that I'm not going about this the right way, but I seem to have absolutely no control over which sprites appear over other sprites during TNT games.
Most of the time the sprites seem to appear in the order of their indexes, but then they often switch mid-program.
I've tryed putting 'Set Sprite Priority' before the 'Sprite ... ", after, before AND after, before the 'Draw Frame', at the start of the program and every frame, but to no avail. The sprites flop haphazardly over each other, randomly shuffling once every minute or so. They seem completely obvilious to their supposed priorities.
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10-14-2003 15:11
Posted by:
someone
Location:
Quebec ( Canada )
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you must use set sprite priority.
e.g.
while true
sprite 1,x,y,image
set sprite priority 1,100
sprite 2,x2,y2,image2
set sprite priority 2,50
sprite 3,x3,y3,image2
draw frame
wend
Sprite 3 will be under sprite 2, sprite 2 will be under sprite 1. I hope this helps.
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10-14-2003 19:02
Posted by:
MapMaker
Location:
Edmonton, Alberta (Canada)
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And if that what you were doing....
I have no clue, but I have also run into similar problems sometimes. I re-arranged the code, and then it usually worked fine, but I never found out what caused it. (Might be a bug or somethng)
Sorry.
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10-15-2003 00:19
Posted by:
eekaydee
Location:
CA, USA
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If you're using variables for the "set sprite priority"s check to make sure that the variables don't change their value. And make sure that you aren't giving the sprites the same priorities of course. Other then that I don't know what could be wrong.
If you can post your code I can look at it.
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10-15-2003 06:10
Posted by:
Miles
Location:
Australia
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Well, I definitely don't use variables for sprite priorities, and although it says in the help file that negative numbers are OK as sprite priorities, i've tried without negative numbers too, and that didn't change anything.
the only limited success i've had is by putting the 'Set Sprite Priority' before 'Draw Frame', making it re-set the sprite priorities EVERY frame, and oddly enough that seemed to work for about 20 seconds... and then all the sprite priorities randomised again...
the only thing i could possibly think of which might be the problem is: Does EVERY sprite require a unique sprite priority?
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10-15-2003 06:25
Posted by:
Miles
Location:
Australia
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OK. I am beginning to seriously doubt it's a problem with my code. I think it's either something wrong with my computer or with TNT. I just tried writing a really simple program...
***
Graphics mode 640,480
Load Images 128
set sprite priority 1,50
Sprite 1,50,50,0
set sprite priority 1,100
Sprite 2,50,50,1
Draw Frame
while not mouse button
wend
***
and no matter what i declare the Sprite Priorities to be, sprite 1 ALWAYS appears in front of sprite 2.
even if i change sprite 1 to be sprite 3 (and, obviously, change the set sprite priority command to 3), that particular image always, without fail, appears in front of the other one. for some reason, TNT on my computer seems to rely of the index of the image in the image bank (like 0, 1, 2 etc) to decide who goes on top. no matter what image resides in index 0 and 1 of image bank 128, image 0 always gets drawn on top.
now this is weird, but at least i can use this knowledge to get my sprites drawn correctly.
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10-15-2003 22:33
Posted by:
someone
Location:
Quebec ( Canada )
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I experienced similar trouble too. I rearranged the code and it fixed it but I never knew why. I'm pretty sure there is a bug somewhere. I remember someonesaying the priority system going down if you set a sprite to the same value it is already...
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10-15-2003 22:56
Posted by:
eekaydee
Location:
CA, USA
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Umm...
quote:
set sprite priority 1,50
Sprite 1,50,50,0
set sprite priority 1,100
Sprite 2,50,50,1
You set sprite 1's priority twice but didn't set sprite 2's.
I think that might make a difference :)
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10-16-2003 02:25
Posted by:
Miles
Location:
Australia
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Oops...
lol, yep, it did. ^_^;;
well, that typed out correctly, the test actually did work... so i guess i've made a mistake somewhere in my game code, but i cannot figure out what....
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