Finding Distance

[Corlen]

Isn't the formula for finding the distance between two objects (X1+X2)-(Y1+Y2)? I can't remember off hand what it is and can't find the place I read it from before.

[Werbad]

Sqr((X1-X2) pow 2 + (Y1-Y2) pow 2)

[Peter]

You could also use the "distance between two objects" expression of the clickteam movement controller.

Regards Peter

[Pixelthief]

thats an inefficient algorithm. If you use it heavily, it will slow down your problem, because square roots take a while to calculate. Use this approximation algorithm from sketchy's snippet manager:

((Max(Abs((X(">Object 1<") - X(">Object 2<"))), Abs((Y(">Object 1<") - Y(">Object 2<"))))) * 0.941246) + ((Min(Abs((X(">Object 1<") - X(">Object 2<")) ), Abs((Y(">Object 1<") - Y(">Object 2<"))))) * 0.41)

[Looki]

Sorry to disappoint you, Pixelthief, but that formula seems to be slower.

A: Sqr((Random(1000)-Random(1000)) pow 2+(Random(1000)-Random(1000)) pow 2)
B: ((Max(Abs((Random(1000)-Random(1000))), Abs((Random(1000)-Random(1000)))))*0.941246)+((Min(Abs((Random(1000)-Random(1000))), Abs((Random(1000)-Random(1000)))))*0.41)

Set counter to *formula*, 50000 loops.

A: 0.41 seconds
B: 0.45 seconds

The result differs of course, but I've tested it about 10 times - B was always slower.

If you insist, I can upload my mfa. It utilizes QueryPerformaceCounter(), a WINAPI function that is very precise (using the DLL object).

I've tested it with constants as well - same result.

[Dynasoft]

This is due to MMF's expression parsing being slower than performing a square root, and one expression being much more complex than the other.

In MMF, I think "(X1-X2) pow 2" even manages to be faster than "(X1-X2) * (X1-X2)", when the reverse is true in compiled languages (e.g. c++).

[Looki]

Yeah, I thought so.

[Crian]

Hm, looks very interesting.

Someone can put an example!
please.
_________________________
Crian

[UrbanMonk]

This is another reason to use lua.

[RickyRombo]

Why not use ADO? (Advanced Direction Object)
or Clickteam Movement controller as mentioned above?