FF7/Coordinates encoding - Revision history

BukTop: 5 revisions imported

2019-05-23T02:11:12Z

5 revisions imported

my_wiki>BukTop: 4 revisions imported

2018-04-04T09:34:16Z

4 revisions imported

my_wiki>Akari at 11:19, 2 October 2010

2010-10-02T11:19:46Z

my_wiki>FeuFeu: /* How to decode coordinates in C */

2006-04-12T10:31:20Z

‎How to decode coordinates in C

my_wiki>FeuFeu at 14:54, 7 April 2006

2006-04-07T14:54:05Z

my_wiki>FeuFeu at 14:40, 7 April 2006

2006-04-07T14:40:13Z

New page

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 :
<pre>[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 |</pre>

Second DWord :
<pre>[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 |</pre>

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.

{| border="1" cellspacing="1" cellpadding="3" align="center" style="border: 1px solid black; border-collapse: collapse;"
|+'''Table: Object ID'''
! style="background:rgb(204,204,204)" align="center" | Value
! style="background:rgb(204,204,204)" align="center" | Object
|-
| 0x00
| Party
|-
| 0x03
| Highwind
|-
| 0x05
| Tiny Bronco
|-
| 0x06
| Buggy
|-
| 0x0D
| Submarine
|-
| 0x13
| Chocobo
|-
| 0x1D
| Weapon
|}

== How to decode coordinates in C ==

Assuming ''1st'' and ''2nd'' are respectively the first and second DWords :
<pre>X = 1st & 0x7FFFF
Y = 2nd & 0x3FFFF
Z = 2nd >> 0x12 // shift arithmetic right
ID = (1st >> 0x13) & 0x1F
DIR = (1st >> 0x14) & 0x0FF0</pre>

← Older revision		Revision as of 10:31, 12 April 2006
Line 44:		Line 44:


−	== How to decode coordinates ~~in C~~ ==	+	== 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 :

← Older revision	Revision as of 02:11, 23 May 2019
(No difference)

← Older revision	Revision as of 09:34, 4 April 2018
(No difference)

@@ Line 22: / Line 22: @@
 |-
 | 0x00
-| Party
+| Cloud
 |-
 | 0x03
 | Highwind
 |-
 | 0x05
@@ Line 32: / Line 41: @@
 | 0x06
 | Buggy
 |-
 | 0x0D
 | Submarine
 |-
 | 0x13
 | Chocobo
 |-
 | 0x1D

@@ Line 13: / Line 13: @@
 * 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.
+* 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