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Merge pull request #37 from boostcamp-2020/feature/kmeans/initialize-…
…centroids KMeans 중심값 생성 함수 추가 (BallCut)
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79 changes: 79 additions & 0 deletions
79
...C-Map/InteractiveClusteringMap/Clustering/KMeans/Centroids/BallCutCentroidGenerator.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // | ||
| // BallCutCentroidGenerator.swift | ||
| // InteractiveClusteringMap | ||
| // | ||
| // Created by Seungeon Kim on 2020/11/28. | ||
| // | ||
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| import Foundation | ||
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| final class BallCutCentroidGenerator: CentroidCreatable { | ||
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| private let coverage: Double | ||
| private let k: Int | ||
| private let points: [Coordinate] | ||
| private let mutiplier: Int = 5 | ||
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| init(k: Int, coverage: Double, coordinates: [Coordinate]) { | ||
| self.k = k | ||
| self.coverage = coverage | ||
| self.points = coordinates | ||
| } | ||
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| func centroids() -> [Coordinate] { | ||
| return recursiveClassify(k: k, coordinates: points) | ||
| } | ||
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| private func recursiveClassify(k: Int, coordinates: [Coordinate]) -> [Coordinate] { | ||
| var coordinates = coordinates | ||
| let container = createContainer(k: k, coordinates: coordinates) | ||
| var centroids: [Coordinate] = pickCentroids(k: k, distance: coverage, container: container) | ||
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| guard centroids.count == k else { return centroids } | ||
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| for coordinate in container { | ||
| guard let index = coordinates.firstIndex(of: coordinate) else { | ||
| return [] | ||
| } | ||
| coordinates.remove(at: index) | ||
| } | ||
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| centroids += recursiveClassify(k: k - centroids.count + 1, coordinates: coordinates) | ||
| return centroids | ||
| } | ||
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| private func createContainer(k: Int, coordinates: [Coordinate]) -> [Coordinate] { | ||
| var coordinates = coordinates | ||
| var container: [Coordinate] = [] | ||
| let count = k * mutiplier | ||
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| for _ in 0..<count { | ||
| guard let coordinate = coordinates.randomElement(), | ||
| let index = coordinates.firstIndex(of: coordinate) | ||
| else { | ||
| return [] | ||
| } | ||
| container.append(coordinate) | ||
| coordinates.remove(at: index) | ||
| } | ||
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| return container | ||
| } | ||
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| private func pickCentroids(k: Int, distance: Double, container: [Coordinate]) -> [Coordinate] { | ||
| var centroids: [Coordinate] = [] | ||
| var container = container | ||
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| for _ in 0..<k { | ||
| guard let centroid = container.randomElement() else { | ||
| return centroids | ||
| } | ||
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| container = container.filter { centroid.distanceTo($0) >= distance } | ||
| centroids.append(centroid) | ||
| } | ||
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| return centroids | ||
| } | ||
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| } |
32 changes: 32 additions & 0 deletions
32
...-C-Map/InteractiveClusteringMap/Clustering/KMeans/Centroids/RandomCentroidGenerator.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| // | ||
| // RandomCetroidGenerator.swift | ||
| // InteractiveClusteringMap | ||
| // | ||
| // Created by Seungeon Kim on 2020/11/28. | ||
| // | ||
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| import Foundation | ||
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| final class RandomCentroidGenerator: CentroidCreatable { | ||
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| private let k: Int | ||
| private let lats: ClosedRange<Double> | ||
| private let lngs: ClosedRange<Double> | ||
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| init(k: Int, rangeOfLat: ClosedRange<Double>, rangeOfLng: ClosedRange<Double>) { | ||
| self.k = k | ||
| self.lats = rangeOfLat | ||
| self.lngs = rangeOfLng | ||
| } | ||
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| func centroids() -> [Coordinate] { | ||
| var centroids: [Coordinate] = [] | ||
| for _ in 0..<k { | ||
| let cluster = Coordinate.randomGenerate(rangeOfLat: lats, rangeOfLng: lngs) | ||
| centroids.append(cluster) | ||
| } | ||
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| return centroids | ||
| } | ||
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| } |
62 changes: 62 additions & 0 deletions
62
...-C-Map/InteractiveClusteringMap/Clustering/KMeans/Centroids/ScreenCentroidGenerator.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // ScreenCentroidGenerator.swift | ||
| // InteractiveClusteringMap | ||
| // | ||
| // Created by Seungeon Kim on 2020/11/28. | ||
| // | ||
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| import Foundation | ||
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| final class ScreenCentroidGenerator: CentroidCreatable { | ||
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| private let topLeft: Coordinate | ||
| private let bottomRight: Coordinate | ||
| private let k: Int | ||
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| init(k: Int, topLeft: Coordinate, bottomRight: Coordinate) { | ||
| self.k = k | ||
| self.topLeft = topLeft | ||
| self.bottomRight = bottomRight | ||
| } | ||
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| func centroids() -> [Coordinate] { | ||
| let center = (topLeft + bottomRight) / 2.0 | ||
| let boundary = Coordinate(x: bottomRight.x - center.x, y: topLeft.y - center.y) | ||
| let pivot = center.findTheta(vertex: Coordinate(x: bottomRight.x, y: topLeft.y)) | ||
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| let increase = Degree.turn / Double(k) | ||
| var angle = increase | ||
| var coords: [Coordinate] = [] | ||
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| for _ in 0..<k { | ||
| let quadrant = Quadrant.findQuadrant(angle: angle) | ||
| let modulus = angle.truncatingRemainder(dividingBy: Degree.right) | ||
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| if modulus == 0 { | ||
| let distance = boundary / 2 | ||
| let coord = quadrant.degree(center: center, boundary: distance) | ||
| coords.append(coord) | ||
| } else { | ||
| let theta = quadrant.theta(angle: modulus) | ||
| let radian = theta * .pi / Degree.straight | ||
| var x: Double | ||
| var y: Double | ||
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| if theta > pivot { | ||
| y = boundary.y | ||
| x = y / tan(radian) | ||
| } else { | ||
| x = boundary.x | ||
| y = tan(radian) * x | ||
| } | ||
| let distance = Coordinate(x: x, y: y) / 2 | ||
| let coord = quadrant.convertToCoordinate(center: center, distance: distance) | ||
| coords.append(coord) | ||
| } | ||
| angle += increase | ||
| } | ||
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| return coords | ||
| } | ||
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| } |
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