Enumerating points on a line no further than a certain distance apart

gistfile1.txt

func enumeratePointsOnLine(startPoint: CGPoint, endPoint: CGPoint, maxDistance: CGFloat, block: (point: CGPoint)->())
{
	// for single point we don't iterate anything
	guard !CGPointEqualToPoint(startPoint, endPoint) else
	{
		block(point: startPoint)
		return
	}
	
	let deltaX = endPoint.x - startPoint.x
	let deltaY = endPoint.y - startPoint.y
	let length = sqrt(deltaX * deltaX + deltaY * deltaY)
	
	let parts = ceil(length / maxDistance)
	
	let partDeltaX = deltaX / parts
	let partDeltaY = deltaY / parts
	
	for i in 0 ... Int(parts)
	{
		let thisPoint = CGPoint(x: startPoint.x + CGFloat(i) * partDeltaX, y: startPoint.y + CGFloat(i) * partDeltaY)
		
		block(point: thisPoint)
	}
}