After spending several hours trying to figure out how to check if one object is within a certain angle limit of another object. I finally found a solution, and thought i would share it here as i could imagine others might run into the same problem.

To quickly explain where I ran into the problem, and so its easier to understand what im talking about. I am working on a tower defence game, and i made a simple tower that track the closest enemy as they come within range. To make sure that the tower doesnt shoot before its actually aiming at an enemy, i wanted to test if an enemy was within 15 degree of the towers cannon angle.

Since Angle(X1,Y1,X2,Y2) return a value in degree between the 2 objects, and the tower cannon angle is an clockwise degree value (think thats correct ). I ran into problems with towers not wanting to shoot, based on where they were placed in comparison to the enemy. Hope it make sense so far as im not really good at these math things.)

And therefore the credit of this doesnt go to me, im just sharing information, and i wont be able to explain exactly what it means, but I will link to the original page in the end for those that want to know the details.

__However to implement it in construct 2 you can do the following:__

To the object that need to have a limited angle of firing (My case cannon):

- Add "is within angle" conditions.

- In the "within" field add your limit.

- In the "Angle" field you add:

(360 + Angle(X1,Y1,X2,Y2)% 360)% 360

(As far as i understand it, it will make sure that the Angle(X1,Y1,X2,Y2) result will always be in positiv degree from [0 to 360], matching return value of the object.Angle that you want to test.....however might be completely wrong )

Source: Is an angle between two other angles?