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Shay Paustovsky
4,281 PointsHaving hard time understand the concept behind 'points' func in swift
func points(inRange range: Int = 1) -> [Point] {
var results: [Point] = []
let lowerBoundOfXRange = x-range
let upperBoundOfXRange = x+range
let lowerBoundOfYRange = y-range
let upperBoundOfYRange = y+range
for xCooardinate in lowerBoundOfXRange...upperBoundOfXRange {
for yCooardinate in lowerBoundOfYRange...upperBoundOfYRange {
let cooardinatePoint = Point(x: xCooardinate, y: yCooardinate)
results.append(cooardinatePoint)
}
}
return results
I understand the initial idea & concept but not much the implementation Pasan Premaratne
Thanks for any replies in advance
2 Answers
Shay Paustovsky
4,281 PointsThank you so much for taking the time to answer my question, I've understood the concept behind it by re-watching the lessons again...and again... until it was clear
Robert Conti
23,274 PointsBeen there! No problem, best of luck!
Robert Conti
23,274 PointsRobert Conti
23,274 PointsSo the function,
points, is passed a value forrange, which is 1 by default. So if our tower can only shoot 1 grid space away from itself, it's range is 1. When we pass the range of the tower topoints, the function does some simple math to create an array of x,y coordinates, telling us what coordinates our tower can fire upon.Now why would we use this?
Because the game checks that array of x,y coordinates to see whether or not the tower and the enemy are within striking distance. So anytime you place a new tower at a new location, you can call
pointsto see where that tower can fire upon.If you want to create a new tower object with a greater range, for instance 2, then you can pass this value to the function and it will give you an array of coordinates for a tower with a range of 2. This makes our code flexible and reusable for different kinds of objects. Theoretically, you could use
pointsfor enemies to determine where they are allowed to move. So if they are only allowed to move one space at a time, then the range of the enemy would be 1. And so on...