Item Data
| Packet ID | Direction | Mojang Name | MCP Name |
|---|---|---|---|
0x83 | Clientbound | ComplexItemDataPacket | Packet131MapData |
Used for sending custom binary data to the client. In Beta 1.7.3 this is only ever used for updating the Map Item. As a result, the following labels may only apply to it.
Clientbound
| Field | Type | Description |
|---|---|---|
| Item ID | Short | ID of the modified Item |
| Map ID | Short | ID of the map that should be displayed |
| Data Size | Byte | Size of the data array |
| Data | Byte Array | Array containing the data |
The data that results from this has a format completely unique to it.
The first byte determines if the sent data is map graphics data (0) or map icon data (1).
Map Data
If the sent data is map data, the next two Bytes are the X and Y offset of the updated map region.
After this follows the map data.
Icon Data
Each icon uses 3 bytes of data.
| # | Data |
|---|---|
| 0 | Rotation (upper 4-bits), Icon Sprite (lower 4-bits) |
| 1 | X offset |
| 2 | Y offset |
Valid icon rotation values range from 0 - 15 and maps to 0.0 - 360.0.
A map can, at most, have (256 - 1) / 3 = 85 icons.
Example packet
| Field | Value |
|---|---|
| Item ID | 358 (Map) |
| Map ID | 1 |
| Data Size | 4 |
| Data | 1, 0, 5, 7 |