CGrectContainPoints & Touches queries - iphone

Question

Im getting straight to the point. I have static coordinates stored as array and i want to compare this coordinates with user touch.
//touch handling
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchPoint = [touch locationInView:touch.view];
//comparing touches
if (CGRectContainsPoint((CGRectMake(x1, y1, w, h)) , touchPoint)) {
// do something
// this is where i got stuck coz i got 2 more sets of x & y. (x2-y2 & x3-y3)
but right now im stuck here coz i dont know how to structure my codes and i want to compare 3 save location touches to user touches so that when they hit the right spot points/score will be added but when they hit the wrong spot life will be deducted. Thanks.

Answer 1

If you had points stored like this . . .
CGPoint p1 = CGPointMake(100,100);
CGPoint p2 = CGPointMake(200,200);
try something like this :
// Get the location of the user's touch
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchPoint = [touch locationInView:touch.view];
float maxDistance = 10;
// Is it in the right place?
if (distanceBetween(touchPoint, p1) < maxDistance)
NSLog(#"touched point 1");
else
if (distanceBetween(touchPoint, p2) < maxDistance)
NSLog(#"touched point 2");
where distanceBetween is a function that looks something like (some maths)
// Distance between two CGPoints
float distanceBetween(CGPoint p1, CGPoint p2) {
float dx = p1.x-p2.x;
float dy = p1.y-p2.y;
return sqrt( dx*dx + dy*dy);
}
Hope that helps,
Sam