[BlitzBasic] blit outside bitmap error

[Raislin77it]

hi, i have a problem with this simple proggy :

NEWTYPE .bullets
x.q
y.q
End NEWTYPE



LoadShape 0,"q:bullet1",0

DEFTYPE .bullets bullet



BLITZ

BitMap 0,320,256,8
InitCopList 0,44,256,$10018,8,256,0
DisplayPalette 0,0
DisplayBitMap 0,0
CreateDisplay 0



bullet\x=1
bullet\y=1

Blit 0,bullet\x,bullet\y


Repeat
VWait                        ;
Until Joyb(0)=1              ;
End

the blitz compiler tells me... blit outside bitmap, but if the x and y of the blit is at 1,1 ? why?

also changing the blit to everything but 0,0 is incorrect

pls help me ;(

[Lonewolf10]

Not into Blitz so I could be 'barking up the wrong tree', but is the handle for the bullets at the top-left corner of the bullet graphic or the centre? If it's at the centre it would explain the error (as the left side of the bullet would be outside the bitmap).

[Raislin77it]

Originally Posted by Lonewolf10

Not into Blitz so I could be 'barking up the wrong tree', but is the handle for the bullets at the top-left corner of the bullet graphic or the centre? If it's at the centre it would explain the error (as the left side of the bullet would be outside the bitmap).

honestly i don't know, but even if it's in the middle, the 0,0 position would make an error, instead it's the only choice who doesn't summon an "exception"

[Graham Humphrey]

This might sound incredibly stupid but... did you save your shape graphic as a brush first and not as a whole image? That's the only thing I can think of off the top of my head - that would explain why it would blit at 0,0 (because at 320x256 it would exactly fit the bitmap) but why it flags an error at any other co-ordinates.

[Coagulus]

just to check, does it work if you use Clipblit instead?

[Raislin77it]

Originally Posted by Graham Humphrey

This might sound incredibly stupid but... did you save your shape graphic as a brush first and not as a whole image? That's the only thing I can think of off the top of my head - that would explain why it would blit at 0,0 (because at 320x256 it would exactly fit the bitmap) but why it flags an error at any other co-ordinates.

here the file

http://www.sendspace.com/file/nk6c1y

i have saved it with redshapez, an it tells 10x10 pixels so i don't think it has saved the original 320x256 image

Originally Posted by Coagulus

just to check, does it work if you use Clipblit instead?

i haven't checked, tomorrow i will check

[Raislin77it]

Originally Posted by Raislin77it

here the file

http://www.sendspace.com/file/nk6c1y

i have saved it with redshapez, an it tells 10x10 pixels so i don't think it has saved the original 320x256 image

oh my god! if i create a bitmap 640x256 i can draw the shape even at x=100.......

so the shape is great than the iff file, but i've grabbed it...







i don't know what to think

[Coagulus]

That file is (according to Dpaint) 320x256 in 256 colours that would be why 1,1 isn't working. I'd load the brush as a picture into dpaint/ppaint, then grab it in there in the correct size and save it.

[Raislin77it]

Originally Posted by Coagulus

That file is (according to Dpaint) 320x256 in 256 colours that would be why 1,1 isn't working. I'd load the brush as a picture into dpaint/ppaint, then grab it in there in the correct size and save it.

yes, saving with ppaint the bullet as a brush works, i need to investigate why with redshapez i wasn't able to save only the correct shape.

thanks to all