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AppGameKit Classic Chat / sprite at rest?

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Ched80
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Joined: 18th Sep 2010
Location: Peterborough, UK
Posted: 2nd Mar 2012 16:21
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Hi,
I.was wondering if anyone had any ideas of how I can detect if a sprite is resting on top of another sprite?
I'll give you some context as I can't just use getspritevelocity.
My application is a bit like Tetris, but uses gravity to control the sprites falling. The sprites also bounce when they hit the bottom. I would like to determine the maximum height of the sprites so I was hoping to cycle through the active sprites and only consider the positions of those at rest and on top of another sprite. I can't seem to find a command that will help me.

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baxslash
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Location: Duffield
Posted: 2nd Mar 2012 17:12
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You could just check its current velocity using getSpritePhysicsVelocityX() and getSpritePhysicsVelocityY()...

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BraindeaD
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Posted: 2nd Mar 2012 17:12
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Hi Ched80
why not using a sensor below the falling piece. If the sensor collides with another sprite set the gravity to 0 a put the y coordinate of falling piece just above the collided sprite. Just an idea.
You can use raycast, too...
Hope it helps a bit.

regards
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Ched80
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Posted: 2nd Mar 2012 17:26
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@baxslash, I tried that route first, but when a sprite got to the top of it's bounce it triggered in error.

@BraindeaD, I forgot about raycasting. Don't want to change the gravity as the bouncing sprites are part of the fun. I'll try combining raycasts with a timer.

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baxslash
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Posted: 2nd Mar 2012 17:29
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What about replacing sprites at rest with static / kinematic sprites?

(I say replace because you can't edit the state of a sprite you have to replace it with a new sprite)

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Ched80
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Posted: 2nd Mar 2012 17:41
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Sorry, I don't want to do that because I want the sprites to fall again if the spires below disappear.

Is there a way to detect if the sprite is sitting on another? If I could combine that with velocity I'd have a winner!

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baxslash
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Posted: 2nd Mar 2012 17:46 Edited at: 2nd Mar 2012 17:48
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Have you tried using the contact loop?

You might be able to use the data retrieved to get what you want?

EDIT: That version is to check for contacts for a specific sprite. You might find using the other version faster:


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Ched80
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Posted: 2nd Mar 2012 18:29
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Cheers B, I'll try them and let you know how I get on.

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