[Graham]

The help file says that a v-layers size can be up to about 16.7 million chars large and to change its size with the counter vlayer_size. When I try to set it to 65536 ( I want a width of 512 and height of 128), it resets to 0. If I set it to 32768 it changes it to -32768. If I change it to 32767 it stays at that size.

The way I read the directions in help, I first set vlayer_size, then I can define vlayer_width and vlayer_height. So setting width and height before defining size is useless right? Or am I not understanding it correctly?

This post has been edited by Graham: 06 July 2017 - 08:30 PM

[Dr Lancer-X]

You're correct. What do you mean that it 'changes it to -32768'? Obviously the vlayer size can't be -32768. If you mean the number in the robot editor is changing to -32768, that's because you need to express larger numbers in an expression as the bytecode format limits values to the range -32768-32767.

[Graham]

Dr Lancer-X, on 06 July 2017 - 12:44 PM, said:

You're correct. What do you mean that it 'changes it to -32768'? Obviously the vlayer size can't be -32768. If you mean the number in the robot editor is changing to -32768, that's because you need to express larger numbers in an expression as the bytecode format limits values to the range -32768-32767.

Oh, that's right! I've never had to deal with a counter larger than 32678. I forgot that was the limit. So to make vlayer_size = 65536, I would want to create an expression such as (32768+32768)?

[Lachesis]

Just this should do:

set "vlayer_size" "(65536)"

[Graham]

Oh ok, thanks

[Wervyn]

I usually prefer to express stuff like this in more explicitly marked powers of 2 anyway with an expression like

set "vlayer_size" to "(1<<16)"

Well, I say "prefer" like I actually use MZX anymore. I have preferred in the past.

[Lachesis]

usually i set it to the exact size i need

set "VLAYER_SIZE" to "('w'*3+80*'max(136),('h'*2)')"
set "VLAYER_WIDTH" to "('w'*3+80)"
put "@d/vlayer.mzm" Image_file p02 at 0 2