CODEWITHSUNDEEP
objective-ccocos2d-iphonecgpoint
Mario
Mario

Reputation: 3379

CGPoint returning method

i try to return a CGPoint but i do something wrong:

Here is my method:

- (CGPoint)calculatePointOnCircleFrom:(CGPoint)pointA PointB:(CGPoint)pointB radius:(float)rd {
    float sryy = pointA.y - pointB.y;
    float srxx = pointA.x - pointB.x;
    float sry = pointA.y + sryy;
    float srx = pointA.x + srxx;
    float kpx = pointA.x + cos(atan2(pointA.y - sry, pointA.x - srx)) * rd;
    float kpy = pointA.y + sin(atan2(pointA.y - sry, pointA.x - srx)) * rd;

    return CGPointMake(kpx, kpy);
}

The code in the method works fine but i do something wrong with the initialization.

Here i call the method:

    point1.position = [self calculatePointOnCircleFrom:Player.position PointB:touchPos radius:64];

and get fooling error: "incompatible type for argument 1 of 'setPosition:'"

Upvotes: 0

Views: 2060

Answers (4)

Mario
Mario

Reputation: 3379

I solved the problem on a not perfect way but it works.

I return know a NSValue:

- (NSValue *)calculatePointOnCircleFrom:(CGPoint)pointA PointB:(CGPoint)pointB radius:(float)rd {
   float sryy = pointA.y - pointB.y;
   float srxx = pointA.x - pointB.x;
   float sry = pointA.y + sryy;
   float srx = pointA.x + srxx;
   float kpx = pointA.x + cos(atan2(pointA.y - sry, pointA.x - srx)) * rd;
   float kpy = pointA.y + sin(atan2(pointA.y - sry, pointA.x - srx)) * rd;

   return [NSValue valueWithCGPoint:CGPointMake(kpx, kpy)];
}

and call method like so:

NSValue *pos = [self calculatePointOnCircleFrom:Player.position PointB:touchPos radius:64];
CGPoint cgpos = [pos CGPointValue];
point1.position = cgpos;

Thanks for every ones help :D

Upvotes: 0

Chuck
Chuck

Reputation: 237110

There's probably also a warning that it can't find the method declaration. It sounds like the compiler doesn't know what type the method returns and is defaulting to id.

Upvotes: 0

Marplesoft
Marplesoft

Reputation: 6240

If you look closely you'll see that the message is about an incompatible type for argument 1 of a method called setPosition, not the calculatePointOnCircleFrom method. The setPosition is the setter for the position property.

So the problem is with the point1.position = part of the line, not the call to the calculatePointOnCircleFrom method. I suspect the position property of the point1 variable is not of type CGPoint since that's what the calculatePointOnCircleFrom method is returning.

Alternatively, you may not be calling the method you think you're calling.

Upvotes: 2

David Gelhar
David Gelhar

Reputation: 27900

That error message is telling you that the type returned by [self calculatePointOnCircleFrom:Player.position PointB:touchPos radius:64] does not match the type of point1.position. Is position a CGPoint?

Upvotes: 0

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