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Make Point and Size honest to goodness structs

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This commit is contained in:
Eryn Wells 2018-11-10 13:50:28 -05:00
parent 5607f01ac1
commit 6b6e317a9c
2 changed files with 61 additions and 57 deletions
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58
Terrain2/Algorithms.swift
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@ -125,18 +125,20 @@ class RandomAlgorithm: Kernel, TerrainGenerator {
/// Implementation of the Diamond-Squares algorithm.
/// - https://en.wikipedia.org/wiki/Diamond-square_algorithm
public class DiamondSquareAlgorithm: TerrainGenerator {
public struct Box {
public typealias Point = (x: Int, y: Int)
public typealias Size = (w: Int, h: Int)
public struct Point {
let x: Int
let y: Int
}
public struct Size {
let w: Int
let h: Int
}
public struct Box {
let origin: Point
let size: Size
init(origin o: Point, size s: Size) {
origin = o
size = s
}
var corners: [Point] {
return [northwest, southwest, northeast, northwest]
}
@ -146,19 +148,19 @@ public class DiamondSquareAlgorithm: TerrainGenerator {
}
var north: Point {
return (x: origin.x + (size.w / 2 + 1), y: origin.y)
return Point(x: origin.x + (size.w / 2 + 1), y: origin.y)
}
var west: Point {
return (x: origin.x, y: origin.y + (size.h / 2 + 1))
return Point(x: origin.x, y: origin.y + (size.h / 2 + 1))
}
var south: Point {
return (x: origin.x + (size.w / 2 + 1), y: origin.y + size.h)
return Point(x: origin.x + (size.w / 2 + 1), y: origin.y + size.h)
}
var east: Point {
return (x: origin.x + size.w, y: origin.y + (size.h / 2 + 1))
return Point(x: origin.x + size.w, y: origin.y + (size.h / 2 + 1))
}
var northwest: Point {
@ -166,19 +168,19 @@ public class DiamondSquareAlgorithm: TerrainGenerator {
}
var southwest: Point {
return (x: origin.x, y: origin.y + size.h)
return Point(x: origin.x, y: origin.y + size.h)
}
var northeast: Point {
return (x: origin.x + size.w, y: origin.y)
return Point(x: origin.x + size.w, y: origin.y)
}
var southeast: Point {
return (x: origin.x + size.w, y: origin.y + size.h)
return Point(x: origin.x + size.w, y: origin.y + size.h)
}
var midpoint: Point {
return (x: origin.x + (size.w / 2 + 1), y: origin.y + (size.h / 2 + 1))
return Point(x: origin.x + (size.w / 2 + 1), y: origin.y + (size.h / 2 + 1))
}
var subdivisions: [Box] {
@ -186,12 +188,12 @@ public class DiamondSquareAlgorithm: TerrainGenerator {
return []
}
let midp = midpoint
let newSize = (w: midp.x - origin.x, h: midp.y - origin.y)
let newSize = Size(w: midp.x - origin.x, h: midp.y - origin.y)
return [
Box(origin: origin, size: newSize),
Box(origin: (origin.x + newSize.w, origin.y), size: newSize),
Box(origin: (origin.x, origin.y + newSize.h), size: newSize),
Box(origin: (origin.x + newSize.w, origin.y + newSize.h), size: newSize)
Box(origin: Point(x: origin.x + newSize.w, y: origin.y), size: newSize),
Box(origin: Point(x: origin.x, y: origin.y + newSize.h), size: newSize),
Box(origin: Point(x: origin.x + newSize.w, y: origin.y + newSize.h), size: newSize)
]
}
@ -230,14 +232,14 @@ public class DiamondSquareAlgorithm: TerrainGenerator {
func render() {
let size = DiamondSquareAlgorithm.textureSize
func ptToIndex(_ pt: Box.Point) -> Int {
func ptToIndex(_ pt: Point) -> Int {
return pt.y * size.width + pt.x
}
var heightMap = [Float](repeating: 0, count: size.width * size.height)
// 0. Set the corners to initial values if they haven't been set yet.
let box = Box(origin: (0, 0), size: (size.width, size.height))
let box = Box(origin: Point(x: 0, y: 0), size: Size(w: size.width, h: size.height))
for p in box.corners {
let idx = ptToIndex(p)
if heightMap[idx] == 0.0 {
@ -303,6 +305,18 @@ public class DiamondSquareAlgorithm: TerrainGenerator {
}
}
extension DiamondSquareAlgorithm.Point: Equatable {
public static func == (lhs: DiamondSquareAlgorithm.Point, rhs: DiamondSquareAlgorithm.Point) -> Bool {
return lhs.x == rhs.x && lhs.y == rhs.y
}
}
extension DiamondSquareAlgorithm.Size: Equatable {
public static func == (lhs: DiamondSquareAlgorithm.Size, rhs: DiamondSquareAlgorithm.Size) -> Bool {
return lhs.w == rhs.w && lhs.h == rhs.h
}
}
extension DiamondSquareAlgorithm.Box: Equatable {
public static func == (lhs: DiamondSquareAlgorithm.Box, rhs: DiamondSquareAlgorithm.Box) -> Bool {
return lhs.origin == rhs.origin && lhs.size == rhs.size