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AppGameKit Classic Chat / Asteroids ship wrap around while using SetSpritePhysicsImpulse

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Scotty1973
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Location: Burton-on-Trent, uk
Posted: 28th Sep 2014 11:25
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Hi

I'm having a problem with SetSpritePhysicsImpulse. What i'm trying to do is, move a space ship round the screen using percentage system.
The ship is moved via SetSpritePhysicsImpulse command and this works fine, but the problem i'm having is that I want to wrap the ship round the screen. So if it goes off the top it will appear at the bottom, or if it goes off the right it will appear on the left and vice versa.
The problem is when I reset the ship position the impulse power is lost and I have no way to find out how much power was left as the ship left the screen.
Wow this sounds long winded lol.
Basic = asteroids(atari 2600) type game where using SetSpritePhysicsImpulse to power ship.


Many thanks

Scotty
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Daniel TGC
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Posted: 28th Sep 2014 11:40
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Just use the commands GetSpritePhysicsVelocityX and GetSpritePhysicsVelocityY store them in a couple of tmp Identifiers and then use the command SetSpritePhysicsVelocity after you use the SetSpritePosition command to restore the velocity.
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Scotty1973
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Location: Burton-on-Trent, uk
Posted: 28th Sep 2014 12:09 Edited at: 28th Sep 2014 12:23
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Cheers Daniel

Missed your live broadcast yesterday and watched on you tube. Great stuff and can't wait for next one. Did think velocity but was trying to put it into the impulse command and getting super fast ship lol.

Thanks

Scotty
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Kenjar
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Posted: 29th Sep 2014 10:28
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Yes Physics can get out of control, I usually just do a simple hardline limiter. I.e. if velocity > x then limit to x I also do the same thing on angular velocity.

Another thing you can do is adjust the mass of the object, objects with higher mass are less affected by collisions.
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Scotty1973
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Posted: 29th Sep 2014 21:13
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You are right Kenjar I did limit the angular velocity may do the same with normal velocity. Thanks for you help.

Scotty
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