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refactored codebase
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@Asheshp23
Asheshp23 committed Nov 8, 2022
1 parent 767340b commit 0abbc2e
Showing 1 changed file with 52 additions and 23 deletions.
75 changes: 52 additions & 23 deletions Sources/GeoJSONSwiftHelper/GridHelper.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -7,17 +7,29 @@ import GEOSwift
public struct GridHelper {
typealias LineCoordinates = (start: CLLocationCoordinate2D, end: CLLocationCoordinate2D)

public static func calcGridLines(bounds: CoordinateBounds, center: CLLocationCoordinate2D, rotationDegrees: Double, offset: SizeInMeters, acreInMeters: Double) -> [GridLineOverlay] {
/// This method will calculate the horizontal and verticle grid lines from the overlay's center to the overlay's bound with the provided rotation and offset.
/// - Parameters:
/// - bounds: The overlay's bounding rectangle.
/// - center: The overlay's center.
/// - rotation: Rotaion should be in degrees and it rotates the grid line as per the provided rotation.
/// - offset: Offset should be in SizeInMeters and it moves the grid line as per the provided offset.
/// - gridCellSize: GridCellSize should be in meters and it is the distance between two grid line.
/// - Returns: The array of GridLineOverlay.
public static func calcGridLines(bounds: CoordinateBounds,
center: CLLocationCoordinate2D,
rotation: Double,
offset: SizeInMeters,
gridCellSize: Double) -> [GridLineOverlay] {
var hLines : [GridLineOverlay] = []
var vLines : [GridLineOverlay] = []

let origin = center.movedBy(latitudinalMeters: offset.height, longitudinalMeters: offset.width)
let gridSize = bounds.northwest.distance(from: bounds.southeast)
var numOfLines = Int(ceil(gridSize / acreInMeters))
var numOfLines = Int(ceil(gridSize / gridCellSize))
numOfLines = numOfLines % 2 == 0 ? numOfLines : numOfLines + 1
let lineLength = Double(numOfLines) * acreInMeters
let lineLength = Double(numOfLines) * gridCellSize

let rotationRadians = (rotationDegrees * Double.pi / 180)
let rotationRadians = (rotation * Double.pi / 180)
let vLineMvmtDirection = (Double.pi / 2.0) + rotationRadians
let hLineMvmtDirection = (Double.pi) + rotationRadians

Expand All @@ -33,7 +45,7 @@ public struct GridHelper {

// Fill the bounds
for num in 1...Int(numOfLines / 2) {
let mvmt = acreInMeters * Double(num)
let mvmt = gridCellSize * Double(num)

// Vertical lines
let vNegLineStart = originVLineStart.movedBy(distanceMeters: -mvmt, bearingRadians: vLineMvmtDirection)
Expand All @@ -59,22 +71,34 @@ public struct GridHelper {
return [vLines.sorted(), hLines.sorted()].flatMap({ $0 })
}

public static func calcGridPolygons(bounds: CoordinateBounds, center: CLLocationCoordinate2D, rotationDegrees: Double, offset: SizeInMeters, acreInMeters: Double) -> [GridPolygonOverlay] {
/// This method will calculate the grid polygons from the overlay's center to the overlay's bound with the provided rotation and offset.
/// - Parameters:
/// - bounds: The overlay's bounding rectangle.
/// - center: The overlay's center.
/// - rotation: Rotaion should be in degrees and it rotates the grid polygon as per the provided rotation.
/// - offset: Offset should be in SizeInMeters and it moves the grid polygon as per the provided offset.
/// - gridCellSize: GridCellSize should be in meters and it is the distance between two grid line.
/// - Returns: The array of GridPolygonOverlay.
public static func calcGridPolygons(bounds: CoordinateBounds,
center: CLLocationCoordinate2D,
rotation: Double,
offset: SizeInMeters,
gridCellSize: Double) -> [GridPolygonOverlay] {
var polygons : [GridPolygonOverlay] = []

let origin = center.movedBy(latitudinalMeters: offset.height, longitudinalMeters: offset.width)
let gridSize = bounds.northwest.distance(from: bounds.southeast)
var numOfLines = Int(ceil(gridSize / acreInMeters))
var numOfLines = Int(ceil(gridSize / gridCellSize))
numOfLines = numOfLines % 2 == 0 ? numOfLines : numOfLines + 1

let rotationRadians = (rotationDegrees * Double.pi / 180)
let rotationRadians = (rotation * Double.pi / 180)
let vLineMvmtDirection = (Double.pi / 2.0) + rotationRadians
let hLineMvmtDirection = (Double.pi) + rotationRadians

for vIndex in 0...Int(numOfLines / 2) {
for hIndex in 0...Int(numOfLines / 2) {
let vMvmt = acreInMeters * Double(vIndex)
let hMvmt = acreInMeters * Double(hIndex)
let vMvmt = gridCellSize * Double(vIndex)
let hMvmt = gridCellSize * Double(hIndex)

if vIndex == 0 && hIndex == 0 {
polygons.append(
Expand All @@ -83,7 +107,7 @@ public struct GridHelper {
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters)
gridCellSize: gridCellSize)
)
} else if vIndex == 0 {
polygons.append(contentsOf: [
Expand All @@ -92,13 +116,13 @@ public struct GridHelper {
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters),
gridCellSize: gridCellSize),
buildPolygon(origin: origin,
vMvmt: vMvmt,
hMvmt: -hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters)
gridCellSize: gridCellSize)
])
} else if hIndex == 0 {
polygons.append(contentsOf: [
Expand All @@ -107,13 +131,13 @@ public struct GridHelper {
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters),
gridCellSize: gridCellSize),
buildPolygon(origin: origin,
vMvmt: -vMvmt,
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters)
gridCellSize: gridCellSize)
])
} else {
polygons.append(contentsOf: [
Expand All @@ -122,25 +146,25 @@ public struct GridHelper {
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters),
gridCellSize: gridCellSize),
buildPolygon(origin: origin,
vMvmt: -vMvmt,
hMvmt: hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters),
gridCellSize: gridCellSize),
buildPolygon(origin: origin,
vMvmt: vMvmt,
hMvmt: -hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters),
gridCellSize: gridCellSize),
buildPolygon(origin: origin,
vMvmt: -vMvmt,
hMvmt: -hMvmt,
vLineMvmtDirection: vLineMvmtDirection,
hLineMvmtDirection: hLineMvmtDirection,
acreInMeters: acreInMeters)
gridCellSize: gridCellSize)
])
}
}
Expand All @@ -149,16 +173,21 @@ public struct GridHelper {
return polygons
}

static private func buildPolygon(origin: CLLocationCoordinate2D, vMvmt: Double, hMvmt: Double, vLineMvmtDirection: Double, hLineMvmtDirection: Double, acreInMeters: Double) -> GridPolygonOverlay {
static private func buildPolygon(origin: CLLocationCoordinate2D,
vMvmt: Double,
hMvmt: Double,
vLineMvmtDirection: Double,
hLineMvmtDirection: Double,
gridCellSize: Double) -> GridPolygonOverlay {
let tl = origin.movedBy(distanceMeters: vMvmt,
bearingRadians: hLineMvmtDirection)
.movedBy(distanceMeters: hMvmt,
bearingRadians: vLineMvmtDirection)
let tr = tl.movedBy(distanceMeters: acreInMeters,
let tr = tl.movedBy(distanceMeters: gridCellSize,
bearingRadians: vLineMvmtDirection)
let bl = tr.movedBy(distanceMeters: acreInMeters,
let bl = tr.movedBy(distanceMeters: gridCellSize,
bearingRadians: hLineMvmtDirection)
let br = tl.movedBy(distanceMeters: acreInMeters,
let br = tl.movedBy(distanceMeters: gridCellSize,
bearingRadians: hLineMvmtDirection)

let coords = [tl, tr, bl, br, tl]
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