Blitz- cannot blit a shape

[peceha]

Hi,
Where do I have a mistake in the following code?
At the end, there is a BLIT command which shows nothing.... but... When I replace it with BLOCK everything works.

BLITZ
BlitzKeys On
InitCopList 0,$0014
CreateDisplay 0

BitMap 0,320,256,4
DisplayBitMap 0,0

InitShape 0,32,16,4
ShapesBitMap 0,1
BitMapOutput 1
Locate 0,0
Print "test" 
Free BitMap 1

Use BitMap 0

While Joyb(0)=0
 If RawStatus($45) Then Goto finito
 If RawStatus($50) Then Blit 0,0,0 ;BLOCK works here
Wend

finito:
End

[Shatterhand]

I believe you have to add a displaybitmap command inside your while loop to see the result of the blit on the.bitmap

[peceha]

Originally Posted by Shatterhand

I believe you have to add a displaybitmap command inside your while loop to see the result of the blit on the.bitmap

Hi,
Just added DisplayBitMap after Blit but it did not change anything. Still Block command seems to work but Blit doesnt.
There is one more thing, if I get and use a shape with GetaShape command (from pre-made graphics) then Blit works fine

[E-Penguin]

I've never had initshape / shapebitmap working. It works the other way around - draw to a bitmap and get the shape.

[peceha]

Looks like a good idea.
Thanks

[peceha]

Originally Posted by E-Penguin

I've never had initshape / shapebitmap working. It works the other way around - draw to a bitmap and get the shape.

Well, it's been long time since that post but I think it is worth mentioning.

Looks like quite accidentally I found the way to make ShapesBitMap work.

The wrong way:

BitMap 1,16,16,4
GetaShape 1,0,0,15,15
Free BitMap 1

ShapesBitMap 1,1
Use Bitmap 1
Boxf 0,0,15,15,5            ;<-- this will never show up on shape 1
Free Bitmap 1

correct way:

BitMap 1,16,16,4
Boxf 0,0,15,15,7            ;<--- this line is required, that's all
GetaShape 1,0,0,15,15       ;the new shape cannot be transparrent
Free BitMap 1               ;for ShapesBitMap to work

ShapesBitMap 1,1
Use Bitmap 1
Boxf 0,0,15,15,5
Free Bitmap 1

[Daedalus]

Totally missed this thread back in the day, but it's probably that your shape doesn't have a cookie associated with it, meaning when you blit it, it's transparent. Drawing the box forces it because it's not transparent from the start, but try adding

MakeCookie 1

(where 1 is the shape number) after you draw to the blank shape, and it should blit just fine, even with transparent areas.

[peceha]

Ha,
you are right!
MakeCookie is the way to go.

[Nightshft]

Related to this:

Can you blit shapes opaque (so colour 0 gets written to target and is not transparent) without using "block"?

What I tried:
When you turn Autocookie off before GetAShape, so the shape is without cookie and blit the shape normally, you wont see anything. I expected the blit to be full-size and opaque without cookie, but seems that in that case it doesnt blit anything. (Which matches your post #7 Daedalus).

Changing blitmode to solidMode didnt help either. All the pixels contained in the cookie received the highest colour (all the bitplanes get switched to 1). Is this intended behaviour or do I miss something?

It works with block but is there a way using a normal blit command?