maximum

[billybob884]

whats the max number of tiles you can copy at once? because i think i passed it...

[bluemonkmn]

Hm.  I didn't think there was a practical limit on copying.  I would have guessed maybe 32767 tiles wide or high would be the limit.  And the number of points in the path, I also would have guessed 32767.

[billybob884]

well, i was copying an area of like 7-8 wide, and probably close to 1500 high at the tiem of crash, so it was probably around 10k to 12k tiles. as for the path, i may have hit the 37k limit, i dont remember where i started/where it crashed. what i was trying to do was have a map that would be the "exact lenght of a song", like it would jstu be a sprite going down the map, and it would take the lenght of hte bgm (credits music) for the sprite to "complete" the map. what i ended up doing was jsut making a small straight path at teh beginning and having it set to path vector, so that worked.

[bluemonkmn]

I just managed to reproduce both the problems you described.  Here are the problems and the work-arounds:

1. Path segment longer than 32767 pixels causes an error.  Workaround: insert extra points along the path so that each segment of the path is no more that 32767 pixels long.

2. Copy rectangle is more than 32767 pixels high or 32767 pixels wide.  Workaround: Copy chunks of the map at a time, each of which are no wider that 32767 pixels and no taller than 32767 pixels.

[durnurd]

I assume you're using this sprite as the player sprite for the credits and that's why it needs to move down the map?  Otherwise, you could just have a point and a delay (Though I suppose if the delay were longer than 32767, it would still crash)

[billybob884]

what is it about that number? thats the max an inventory can be/have too

[durnurd]

it's (2^(16-1) - 1) if that's helpful.  Basically, an integer takes up 16 bits, or 2 bytes (in binary).  SGDK stores most information as integers.  So the maximum an integer can be is (2^16 - 1) = 65535.  I know what you're thinking.  "Why minus 1" and "That's not 32767".  First of all, minus 1... think of it this way.  Using one bit, you can represent 0 or 1.  Using two bits you can represent 0 (00), 1 (01), 2 (10), or 3 (11).  That is, 2^2 - 2 = 3.  Second of all, it's not 32767 because that's assuming it's an unsigned integer.  Basically, with 16 bits you can represent numbers 0 to 65535, OR you can use one of the bits to represent positive or negative, and represent numbers from -32768 to 32767.  That's what SGDK is doing.  So technically, you could have -32768 of an inventory