AGK Random Function - GameCreators Forum

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DannyD

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Posted: 28th Apr 2019 13:38

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Hi

I use the random and Random2 functions to place 6 sprites randomly on the screen without success.
It doesn't spread the sprites nicely. (See attached images)
Anyone with a better solution / example code to Spread the sprite "better"

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Jambo B

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Posted: 28th Apr 2019 16:22

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How about this. Before placing a new sprite, loop through the others, checking how far away they are from the one you are about to place. If one of them is too close, grab another random number and try that. In case there are loads of sprites, to avoid getting stuck in the loop, you could limit the number of 'tries' the program has at getting an empty space.

Just a thought!

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fubarpk

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Posted: 28th Apr 2019 17:17

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they look like 3D objects to me
but I would check for sprite collisions when you are randomly
placing them if they overlap then assign a new random position

similarly you could check within your own sprite bounds
ie SpritePositionbybyOffsetX-100 and SpritePositionbyOffsetX + 100

so you would need a loop to place your sprites where a function
could be called to check if its in bounds of one of the other sprites
if the function returns 1 for example it proceeds to place next sprite

just some ideas to try

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PSY

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Posted: 28th Apr 2019 19:42

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The issue might be your random code. Maybe you chose bad random intervalls.
Have you got some code to show?

PSY LABS Games
Coders don't die, they just gosub without return

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DannyD

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Posted: 29th Apr 2019 00:16

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@PSY
It's just images of 3D objects, but not 3D. Can be any image...

Normal for/next loop

+ Code Snippet

			for b = 1 to 6
				sprite[b]=number[b]+1000   // ASSIGN MY OWN NUMBER ID TO THE SPRITE (Need to know the number  later)
			       loadimage (sprite[b] , str(number[b])+".png")
				createsprite(sprite[b],sprite[b])
				//SetRandomSeed ( 47 )
				SetSpritePosition(sprite[b],random2(500,1150),random2(-5,550))
			next a

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Virtual Nomad

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Posted: 29th Apr 2019 02:56 Edited at: 29th Apr 2019 03:03

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Quote: "It doesn't spread the sprites nicely."

i think you want quasi-random or low-descrepancy sequences (vs truly random or pseudo-random). i've seen the term "scatter", too.

while i wouldn't begin to know what all that math is about, i would fake it by dividing the area you want the sprites to fall in into what i'll call "quadrants" (or some other form of dividing the area you want the sprites to fall in).

then, randomly pick a quadrant, randomly place the sprite inside the quadrant, mark the quadrant as "occupied" then move on to the next sprite.

if the number of sprites > than the number of quadrants, add 1 to each quadrant as the sprites are placed and use the quadrant "counts" as "weight" for subsequent choices.

it's been awhile since i wrote code to "uniformly scatter" (dunno what the real term is), but i feel the theory is sound