I am trying to add a SKNode
between two points like picture below.
I count the distance between those two points with this code (works fine):
func distanceCount(_ point: CGPoint) -> CGFloat { return abs(CGFloat(hypotf(Float(point.x - x), Float(point.y - y)))) }
Then I count the middle point(also works fine)
func middlePointCount(_ point: CGPoint) -> CGPoint { return CGPoint(x: CGFloat((point.x + x) / 2), y: CGFloat((point.y + y) / 2)) }
Finally this function adds my object ( SKNode
) :
func addBlock(_ size:CGSize, rotation:CGFloat, point: CGPoint) -> SKNode{
let block = SKSpriteNode(color: UIColor.lightGray , size: size)
block.physicsBody = SKPhysicsBody(rectangleOf: block.frame.size)
block.position = point //This is my middle point
block.physicsBody!.affectedByGravity = false
block.physicsBody!.isDynamic = false
block.zRotation = rotation
return block
}
Summary : My addBlock
function adds object with right width and centred on the right place , but angle is wrong.
Note : I have tried to create functions which should count the angle but they were all wrong :/ .
My question: How can I get the right angle , or is there some other how can I reach my goal?
If you need more details just let me know.
Thank you :)
The midpoint between 2 points A
and B
is defined as
midpoint = {(A.x + B.x) / 2, (A.y + B.y) / 2}
So let's create and extension of CGPoint
to easily build a Midpoint
starting from 2 points
extension CGPoint {
init(midPointBetweenA a: CGPoint, andB b: CGPoint) {
self.x = (a.x + b.x) / 2
self.y = (a.y + b.y) / 2
}
}
Now let's test it
let a = CGPoint(x: 1, y: 4)
let b = CGPoint(x: 2, y: 3)
let c = CGPoint(midPointBetweenA: a, andB: b) // {x 1,5 y 3,5}
Looks good right?
Now given your 2 points you just need to calculate the midpoint and assign it to the position of your SKNode
.
let nodeA: SKNode = ...
let nodeB: SKNode = ...
let nodeC: SKNode = ...
nodeC.position = CGPoint(midPointBetweenA: nodeA.position, andB: nodeB.position)
要获得两点之间的角度,您需要使用以下内容
atan2(p2.y-p1.y, p2.x-p1.x)
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