What i did / Steps to reproduce

The coordinate system is centered around one block.

Expected result

In the middle of the world there should be a 2x2 square between (0,0) and (-0,-0). This is how it works in Minecraft.

Actual result

There is a (0,0) block for the (0,0) block in MC itself, however, the (-0,-0) block in MC is the (-1,-1) block on BlueMap. This issue is of course also for the other two blocks of the square around (0,0).

Context

BlueMap Version:
1.4.2-fabric-1.16.4 (from the file name)

I think this is not a deal-breaking issue, but still.

In the middle of the world there should be a 2x2 square between (0,0) and (-0,-0). This is how it works in Minecraft.
@twboom

No it's not :)
If you read coordinates in F3 you need to always round down to get the blocks integer-coordinates.
0.3 -> 0
-0.3 -> -1

E.g. using the commands

/setblock 0 3 0 minecraft:blue_wool
/setblock -1 3 0 minecraft:red_wool

ingame, will result in 2 blocks exactly next to each other:

meaning that bluemap's coordinates are correct, right? :)