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cocosboy
Member
Hi,
I am using chipmunk for my project. I wish to cast a ray from one point to an other I searched this link from for help. But how to proceed with this segment queries. please guide me to use them.
Actually I wish to cast a ray from enemy to my player to see if there is any hurdle in between them (I have added some hurdles in game play).
thanks in advance
cocosboy
cpShape *shape = cpSpaceSegmentQueryFirst(_space, start, end, layers, group, NULL);
if (shape != player && shape != enemy)
{
//hurdle was hit!
}...where start and end would just be the positions of the player and enemy in question, layers and group would probably be CP_ALL_LAYERS and CP_NO_GROUP respectively.
[Edit] Now I'm realizing this just returns the first shape hit, which will probably be player or enemy.... unless you adjust the start and end points to not be inside either of them... hmmm have you looked at SpaceManager?
cocosboy
Member
I could not understand about CP_ALL_LAYERS and CP_NO_GROUP.
this is layer that we add while adding shape like this?
MyShape->layers = 1;
MyShape->group = 1;if so that I will have to keep the group and layer same for enemy, hurdle, player.
right?
and i have not checked about space manager can it help good then this raycast?
Well by default all shapes get assigned to CP_ALL_LAYERS and CP_NO_GROUP... however you bring to light a good point, if you put all your hurdles in the same group/layer and then call that function with the correct group/layer value everything should be peachy, in fact it simplifies things greatly.
I mentioned SpaceManager because it wraps a lot of chipmunk functionality like this into arguably "simpler" objective-c style methods.
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