git.r.bdr.sh - rbdr/map/blob - Map/Presentation/Base Components/MapRender/MapGroup.swift

   1 import ConcaveHull
   2 import SwiftUI
   3
   4 struct MapGroup: View {
   5
   6   let mapSize: CGSize
   7   let vertexSize: CGSize
   8   let group: [Vertex]
   9   let color: Color
  10
  11   let cornerSize = CGSize(width: 2.0, height: 2.0)
  12   var strokeSize: CGFloat { 1.75 * vertexSize.width }
  13
  14   var hull: [CGPoint] {
  15     let groupList = group.map({ vertex in
  16       return [Double(vertex.position.x), Double(vertex.position.y)]
  17     })
  18     let hull = Hull()
  19     let hullPoints = hull.hull(groupList, nil)
  20     return hullPoints.compactMap({ object in
  21       if let point = object as? [Double] {
  22         return CGPoint(x: point[0], y: point[1])
  23       }
  24       return nil
  25     })
  26   }
  27
  28   var body: some View {
  29     Path { path in
  30       var initialMove: CGPoint?
  31
  32       for point in hull {
  33         let offsetPoint = CGPoint(x: w(point.x), y: h(point.y))
  34
  35         if initialMove == nil {
  36           path.move(to: offsetPoint)
  37           initialMove = offsetPoint
  38         } else {
  39           path.addLine(to: offsetPoint)
  40         }
  41       }
  42
  43       if let initialMove = initialMove {
  44         path.addLine(to: initialMove)
  45       }
  46
  47     }
  48     .applying(
  49       CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
  50     )
  51     .fill(color)
  52     .stroke(
  53       color,
  54       style: StrokeStyle(
  55         lineWidth: strokeSize,
  56         lineCap: .round,
  57         lineJoin: .round,
  58         miterLimit: 0,
  59         dash: [],
  60         dashPhase: 0
  61       )
  62     )
  63   }
  64
  65   func h(_ dimension: CGFloat) -> CGFloat {
  66     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  67   }
  68
  69   func w(_ dimension: CGFloat) -> CGFloat {
  70     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  71   }
  72 }
  73
  74 #Preview {
  75   MapGroup(
  76     mapSize: CGSize(width: 400.0, height: 400.0), vertexSize: CGSize(width: 25.0, height: 25.0),
  77     group: [
  78       Vertex(id: 0, label: "A Circle", position: CGPoint(x: 50.0, y: 50.0)),
  79       Vertex(id: 1, label: "A Square", position: CGPoint(x: 10.0, y: 20.0), shape: .square),
  80       Vertex(id: 2, label: "A triangle", position: CGPoint(x: 25, y: 32.0), shape: .triangle),
  81       Vertex(id: 3, label: "An X", position: CGPoint(x: 70.0, y: 70.0), shape: .x),
  82     ], color: .red)
  83 }