Make randomised sprites in a specific co-ordinate do something - iphone

Question

I was wondering if anyone could help me with my program,
I have randomised my sprites into a specific set of co-ordinates.
I want one of the sprites that is at that specific co-ordinate, to be able to make them do something when they are at this random co-ordinate. The problem i am having is that i have to make a long list of if statements saying if this sprite is here do this if another sprite is here do the exact same thing.
if (red1.position.y>=0 && red1.position.y<=63) {
id r1animation = [CCMoveTo actionWithDuration:0.2 position:ccp(red1.position.x,33)];
[red1 runAction:r1animation];
}
if (red2.position.y>=0 && red2.position.y<=63) {
id r2animation = [CCMoveTo actionWithDuration:0.2 position:ccp(red2.position.x,33)];
[red2 runAction:r2animation];
}
i want to be able to say if any of the sprites are at that exact co-ordinate then move them to a point, in a short amount of code as possible. so basically grouping the sprites or something i'm not sure.
Thanks

Answer 1

i want to be able to say if any of the sprites are at that exact co-ordinate then move them to a point
Firstly, specify the 'hotspot' programatically:
CGPoint hotspot = ccp(32,32); // convenience macro,
//creates a CGPoint with x = 32, y = 32
You should store a reference to all your sprites in an array when you create them (you can use cocos2d's 'tagging' also, but I usually like to use an array for simplicity)
-(void)init {
//.. misc
// creating sprite returns a reference so keep it in an array
CCSprite* curSprite = [CCSprite spriteWithFile: //...etc]
[self.spriteArray addObject: curSprite];
// add all sprite references to your array
}
Now you can iterate over this array to see if any of the sprite's frames overlap the hotspot:
-(BOOL) checkAllSpritesForCollision
{
for (CCSprite *sp in self.spriteArray)
{
CGRect spriteRect = sp.frame;
if (CGRectContainsPoint(spriteRect,hotspot))
{
// run your action on sp...
}
}
// you might like to return YES if a collision happened?
}
This is a brute force method of checking whether every sprites frame contains a given point. There are many ways to skin this cat of course, but hopefully this will set you on a better path.

Answer 2

What you can do is to calculate the distance:
float pointX = thePoint.position.x;
float pointY = thePoint.position.y;
float pointDeltax = sprite.position.x-pointX;
float pointDeltay = sprite.position.y-pointY;
float pointDist = sqrt(pointDeltax*pointDeltax+pointDeltay*pointDeltay);
But maybe davbryns solution suits your purpose better.