Custom type embedded loop
Blitz3D Forums/Blitz3D Beginners Area/Custom type embedded loop
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| Is it possible to iterate through a list of a custom type with a "for each" loop and then do the same within that loop? For instance, say I have a custom type called particle. Type particle Field x,y,w,h End Type Now I create a bunch of particles and I want to run collision routines on them. for p.particle = each particle for c.particle = each particle if c <> p and rectsoverlap(p\x,p\y,p\w,p\h,c\x,c\y,c\w,c\h) then ; collision takes place end if next next I'm trying to do something like this but as soon as I reference the variable c I get an error about it not being a custom type. Is there a different way to do this? |
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| You should be able to do that fine. It must be something in your collision code. For instance, if you collide and end up deleting a type object, whilst the other is using it, it won't exist. for instance: p.particle = 4th object c.particle = 3rd object No collision p.particle = 4th object c.particle = 4th object Collision! Delete c.particle! This would delete the object p.particle is pointing to, therefore upon : p.particle = 4th object c.particle = 5th object p.particle no longer exists. This problem will occur till the outer loop , p.particle, has moved on to the next object in the type list, assuming it hasn't been deleted that is. To prove it works: Type part Field x,y End Type For loop = 1 To 200 p.part = New part p\x = Rand(0,20) p\y = Rand(0,20) Next For p.part = Each part For c.part = Each part If c\x = p\x Then Print p\x End If Next Next |
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