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Dark GDK / Help with sprite collision

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negi
13
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Joined: 16th Feb 2011
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Posted: 22nd Dec 2011 23:42
Hay im making my own version of Asteroids and for some reason the collision isnt working. its not returning true.

here is the code for the classes i made to contol the asteroids and bullets

Bullet Class


Asteroid Class


I even tryed to check for a collision not even using the classes so please tell me what im doing wrong

thanks for any help

All is revealed with time.
Hassan
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Posted: 23rd Dec 2011 08:40
how do you store/collect your bullets/asteroids?
this should work, if you're using vectors for example

this should be somewhere in your game loop

negi
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Posted: 23rd Dec 2011 09:02
Well im making them in an array of objects and the problem im having is when I use dbSpriteCollision() or dbSpriteHit() and they both keep returning true constantly even when the sprites arent colliding.

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JTK
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Posted: 23rd Dec 2011 14:47


First, are you sure that "HitId" is greater than zero?


GDK Docs say:

Quote: "If a target sprite has not been specified and a value of zero has been used, this command will return the sprite number of any sprite overlapping it.
"


So basically, if HitId == 0 and you have a background sprite, then the return value would be the background sprite's id. Try changing your code to:



This way, you can place a break-point on the line and see what the real return value is. The reason it's important to know the real value returned is becase any non-zero value will be true when converted to bool; only zero will be false when converted. So, if any other value besides zero is returned by dbSpriteCollision(), your BulletHit() method will return true.

I hope this helps,

JTK
negi
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Posted: 23rd Dec 2011 21:05
It did help but I tryed loading another image not using a class and cheking if there is a collision with she sprite I have as the ship and the return is still true. so I made a seperate game using the same two sprites and code for collision and it works just fine so it must be a problem with my game.

I will upload the whole project file to see if you can see what I must be missing. And thanks so much for your help

All is revealed with time.

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bad ass little venom
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Joined: 28th Dec 2011
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Posted: 29th Dec 2011 21:09 Edited at: 30th Dec 2011 07:58
i cant solve this post easily but ok u have a sprite 30 by 30. 30 is to the top and 30 is to the bottom ur image within this might only be 10 by 25 but in dark gdk what u dont see by the color key is still there and the size of the image is the endge were the collision will happen being 30 30

spider

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