Difference between revisions of "FF7/Coordinates encoding"
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* Y is an unsigned value ranging from 0 to 0x37FFF | * Y is an unsigned value ranging from 0 to 0x37FFF | ||
* Z is signed | * Z is signed | ||
| − | * Direction is multiplied by 0x10 after reading from save-game, but that's not affecting anything so we can think of it as a byte value. | + | * Direction is multiplied by 0x10 after reading from save-game, but that's not affecting anything so we can think of it as a byte value. e.g: 00: South, 40: East, 80: North, C0: West |
| Line 22: | Line 22: | ||
|- | |- | ||
| 0x00 | | 0x00 | ||
| − | | | + | | Cloud |
| + | |- | ||
| + | | 0x01 | ||
| + | | Tifa | ||
| + | |- | ||
| + | | 0x02 | ||
| + | | Cid | ||
|- | |- | ||
| 0x03 | | 0x03 | ||
| Highwind | | Highwind | ||
| + | |- | ||
| + | | 0x04 | ||
| + | | Yellow Chocobo | ||
|- | |- | ||
| 0x05 | | 0x05 | ||
| Line 32: | Line 41: | ||
| 0x06 | | 0x06 | ||
| Buggy | | Buggy | ||
| + | |- | ||
| + | | 0x07 | ||
| + | | Cannon from Junon | ||
| + | |- | ||
| + | | 0x0C | ||
| + | | Phoenix from Fort Condor | ||
|- | |- | ||
| 0x0D | | 0x0D | ||
| Submarine | | Submarine | ||
| + | |- | ||
| + | | 0x0E | ||
| + | | Gold Saucer | ||
| + | |- | ||
| + | | 0x0F | ||
| + | | Rocket | ||
| + | |- | ||
| + | | 0x10 | ||
| + | | Rocket launch pad | ||
|- | |- | ||
| 0x13 | | 0x13 | ||
| Chocobo | | Chocobo | ||
| + | |- | ||
| + | | 0x18 | ||
| + | | North crater dome | ||
| + | |- | ||
| + | | 0x19 | ||
| + | | Ancient Forest | ||
|- | |- | ||
| 0x1D | | 0x1D | ||
| Line 44: | Line 74: | ||
| − | == How to decode coordinates | + | == How to decode coordinates == |
Assuming ''1st'' and ''2nd'' are respectively the first and second DWords : | Assuming ''1st'' and ''2nd'' are respectively the first and second DWords : | ||
Latest revision as of 05:11, 23 May 2019
Coordinates on the world map are stored on 2 DWords and some basic decoding has to be done before you can manipulate them.
First DWord :
[1F 1E 1D 1C 1B 1A 19 18:17 16 15 14 13 12 11 10:0F 0E 0D 0C 0B 0A 09 08:07 06 05 04 03 02 01 00] | DIRECTION/0x10 | OBJECT'S ID | X COORDINATE OF THE OBJECT |
Second DWord :
[1F 1E 1D 1C 1B 1A 19 18:17 16 15 14 13 12 11 10:0F 0E 0D 0C 0B 0A 09 08:07 06 05 04 03 02 01 00] | Z COORDINATE OF THE OBJECT | Y COORDINATE OF THE OBJECT |
Notes :
- X is an unsigned value ranging from 0 to 0x47FFF
- Y is an unsigned value ranging from 0 to 0x37FFF
- Z is signed
- Direction is multiplied by 0x10 after reading from save-game, but that's not affecting anything so we can think of it as a byte value. e.g: 00: South, 40: East, 80: North, C0: West
| Value | Object |
|---|---|
| 0x00 | Cloud |
| 0x01 | Tifa |
| 0x02 | Cid |
| 0x03 | Highwind |
| 0x04 | Yellow Chocobo |
| 0x05 | Tiny Bronco |
| 0x06 | Buggy |
| 0x07 | Cannon from Junon |
| 0x0C | Phoenix from Fort Condor |
| 0x0D | Submarine |
| 0x0E | Gold Saucer |
| 0x0F | Rocket |
| 0x10 | Rocket launch pad |
| 0x13 | Chocobo |
| 0x18 | North crater dome |
| 0x19 | Ancient Forest |
| 0x1D | Weapon |
How to decode coordinates
Assuming 1st and 2nd are respectively the first and second DWords :
X = 1st & 0x7FFFF Y = 2nd & 0x3FFFF Z = 2nd >> 0x12 // shift arithmetic right ID = (1st >> 0x13) & 0x1F DIR = (1st >> 0x14) & 0x0FF0
