Staredit Network > Forums > SC1 UMS Theory and Ideas > Topic: Relative Distance Detection
Relative Distance Detection
Jan 3 2019, 3:52 am
By: goobie  

Jan 3 2019, 3:52 am goobie Post #1

Hi All!

I've not seen anything on the forums or wiki that provides quite this functionality, so I thought I'd share it. I've created a system that will determine the distance between two units' x and y coordinates. It utilizes location shifting to ignore one coordinate at a time. In my sample map you can see this happening along the top and left edges of the map. Your zergling and marine's movements are tracked by burrowed zerglings. Then it's a simple pseudo-grid (It can't place a location at a specified destination, only detect units) to compare the distance between the x-zerglings and the y-zerglings. The advantage is that this pseudo-grid utilizes 30 locations, but can cover most of the map!

The sample map can determine the distance between x and y coordinates up to 224 pixels (7 tiles) with an accuracy of 8 pixels, rounded down. A pixel accurate version could be created using more locations. I've used zerglings, which are 16x16 pixels, so to detect distances smaller than 8 pixels I would need to use inverted locations. I believe a hybrid with a static grid along the axes could be used to increase the maximum distance detectable to the map size, at the cost of units.

I used the trigger generator LIT, so I'm including the lua file and a link to CecilSunkure's thread for LIT.


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Post has been edited 2 time(s), last time on Jan 3 2019, 4:04 am by goobie.

There's got to be something more to life than being really, really, ridiculously good looking...

Jan 3 2019, 8:45 am Lanthanide Post #2

Do you know that SCR supports EUD actions, such as being able to read and write the specific Left/Right/Top/Bottom positions of locations?


Jan 3 2019, 10:06 am goobie Post #3

I'm trying to avoid EUDs as in my experience they break replay and save functionality in SC remaster. But it is good to know EUDs can access location data directly, I was not aware of that!

There's got to be something more to life than being really, really, ridiculously good looking...

Jan 3 2019, 10:57 am Pr0nogo Post #4

Yes, EUDs break saves, replays, extended unit limits, and several triggers like set next scenario as far as I remember. Maybe someone has a complete list of functions that are disabled by using EUDs in 1.2+.

Jan 3 2019, 1:23 pm jjf28 Post #5

Cartography Artisan

I like this, a simple way of grabbing coordinate differences; here's one existing alternative:

You should be able to get single coordinate accuracy using Exact Coordinate Detection then calculating the difference (which is the leftover amount when doing a binary countoff to zero e.g. if a > 4096 && b > 4096 then a -= 4096, b -= 4096; difference can be easily optimized).

I knitted together that, Precise Location Placement, and some EUD conditions to make a little shooter.

I've moved this thread to theories.

TheNitesWhoSay - Clan Aura - github

Reached the top of StarCraft theory crafting 2:12 AM CST, August 2nd, 2014.

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