Calculating the distance CGPoint travelled from one place to another

Question

What method do I have to use for calculating the distance that CGPoint travelled from its old position to new position?

var point: CGPoint = CGPointMake(x:50.0, y:50.0)

...and there is a method for dragging a point with LMB:

func mouseDragged(event: NSEvent) {

    var pointDragged = self.convertPoint(event.locationInWindow, fromView: nil)
}

Do you need to find X offset? – Alexander Doloz Sep 06 '16 at 15:54 — Alexander Doloz, Sep 06 '16 at 15:54

score 1 · Accepted Answer · edited Jul 07 '17 at 14:41

Use Pythagorean theorem and mouseLocation = event.mouseLocation() where event in your case is of type NSEvent.

let point1: CGPoint = CGPoint(x: 2.0, y: 9.0)
let point2: CGPoint = CGPoint(x: 4.0, y: 13.0)

let xDist = (point1.x - point2.x)
let yDist = (point1.y - point2.y)
let distance = sqrt((xDist * xDist) + (yDist * yDist))

print(distance)

point1 would be your starting position and you can obtain the position where the user clicked - point2, from the NSEvent in your mouseDragged function:

mouseLocation = event.mouseLocation()
point2 = CGPointMake(mouseLocation.x, mouseLocation.y)

Calculating the distance CGPoint travelled from one place to another

1 Answers1