Position on map

[Supporter76]

How can i recalculate the position of a player on server ?

I have the database "characters" and their i have 5 columns ( for positions ):

Position_x | Position_y | Position_z | map | orientation

______________________________________________

-3064,61 | 2525,7 | 61,89 | 530 | 2,17

Now i wanna the x and y position of a player on the map.

Can somebody calculate position of this player and describe me then how he calculate it.

Thank you

[Schmoozerd]

that's a bunch (one for one map) of linear transformations, so quite simple

[Patman128]

Position_x | Position_y | Position_z | map | orientation

______________________________________________

-3064,61 | 2525,7 | 61,89 | 530 | 2,17

Now i wanna the x and y position of a player on the map.

Would it not be -3064.61 and 2525.7?

[Supporter76]

what that means for me now ... sry it is a stupid question, but can u tell me the final coords for this player ( x, y ) ?

Thank you

EDIT:

Position_x | Position_y | Position_z | map | orientation

______________________________________________

-3064,61 | 2525,7 | 61,89 | 530 | 2,17

Now i wanna the x and y position of a player on the map.

Would it not be -3064.61 and 2525.7?

x= -3064.61 , y = 2525.7 .... how can a coordinate be negative

[Patman128]

x= -3064.61 , y = 2525.7 .... how can a coordinate be negative

Teleport to 0,0 on the map. The origin is not always a corner of the map, it's in the middle. On 530 this is most likely in some netherspace area between Outland and BC starting zones. On 0 it is in the Alterac Mountains.

[Supporter76]

Patman thank you for reply ...

Hmm... know i have one problem i wanna convert this values in values like cartographer addon ... when i look in my database and see value of a player than i wanna convert it into x,y ( cartographer coordinates ) - than i can simple see ... ah the player is here and here

[Schmoozerd]

yes, as I said: affin linear transformation from R^2 -> R^2

all you need is to get the 4 entries of the corresponding matrix (for each map) and 2 entries for the affin part

(though infact the matrix looks like (0,a,b,0))

that's easiest handled with flying to {0%, 100%}^2 and then do .gps

then only you need to solve a system of linear equations.

You can simplify this if you retreat to 2 linear functions, px(y) = a*y + s and py(x) = b*x + t

(remark these funny blizzard developer somehow managed to go the y-axis from right to left, and the x-axis from south to north

[Patman128]

Or to put it into simpler terms, here is the mangos function for converting map co-ords (like the ones in DB) into zone co-ords (like Cartographer)

bool Map2ZoneCoordinates(float& x,float& y,uint32 zone)
{
   WorldMapAreaEntry const* maEntry = sWorldMapAreaStore.LookupEntry(zone);

   // if not listed then map coordinates (instance)
   if (!maEntry || maEntry->x2 == maEntry->x1 || maEntry->y2 == maEntry->y1)
       return false;

   x = (x-maEntry->x1)/((maEntry->x2-maEntry->x1)/100);
   y = (y-maEntry->y1)/((maEntry->y2-maEntry->y1)/100);    // client y coord from top to down
   std::swap(x,y);                                         // client have map coords swapped

   return true;
}

You need to look up the zone in WorldMapArea.dbc. This will give you 4 co-ordinates: x1, x2, y1, and y2. These are the limits for the zone's map. To get the zone co-ordinates, simply run:

x = (x1)/((x2-x1)/100);

y = (y1)/((y2-y1)/100);

and then switch x and y. (If you want to know which columns are x1, x2, etc, see struct WorldMapAreaEntry in DBCStructure.h)

[Supporter76]

Thank you so much - problem solved