Understanding this Line from RTS

kevindekever · 10-10-2016 07:01 AM

File: Unit

float unique=RandomF();

atlas->add(_pos, scale, move_path.elms() ? atlas_move[Trunc(Time.time()*5+unique)&1] : attacking ? atlas_attack[Time.time()-last_action_time>=AttackDuration*0.5] : 0, mirror);

This is the important line for changing Images/Sprites. But don't understanding the red part.

Zervox · 10-10-2016 08:30 AM

Although there are other ways of doing it than is done there.

Have you tried logging the results to see the difference, that alone could tell plenty,

Code:

time = Time.time()

result = time*5+unique

LogN(S+(time*5+unique) + " : "+Trunc(time*5+unique)+ " : "+(Trunc(time*5+unique)&1));

kevindekever · 10-10-2016 09:10 AM

thanks for reply
i understand it generates 0 or 1
but why "*5" and "+unique"

trying to raise "2 Sprites" to "10 Sprites" for 1 Animation.
so replaced the "&1" with "&9" but this doesnt work....my new Zombie Unit flickers
it seems, that i have to write a new animation class

**Esenthel** · 10-10-2016 09:17 AM

*5 is animation speed
unique is a unique value for every unit, this is to avoid all units on the screen animating the same frame in the same time

kevindekever · 10-10-2016 09:22 AM

ahh

thank you
i will use modulo and this helped me

Trunc(Time.time()*5+unique)%10

i dont know what "&1" do but until "&7" works fine but "&9" gaves me strange behavior (flicker)
so mod is the better way for me

**Esenthel** · 10-10-2016 11:49 PM

&1 is %2
&7 is %8
you can use & only for power of 2's

kevindekever · 10-11-2016 07:45 AM

Never used bitwise AND before in projects. Thanks for your explanation.
My Zombies are under control grin

Understanding this Line from RTS
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