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

   1 import SwiftUI
   2
   3 struct MapOpportunities: View {
   4
   5   let mapSize: CGSize
   6   let lineWidth: CGFloat
   7   let vertexSize: CGSize
   8   let opportunities: [Opportunity]
   9
  10   let arrowheadSize = CGFloat(10.0)
  11
  12   var body: some View {
  13     ForEach(opportunities, id: \.id) { edge in
  14       Path { path in
  15
  16         // First we transform edges from percentage to map coordinates
  17         let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y))
  18         let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y))
  19
  20         let multiplier = CGFloat(edge.destination.x > edge.origin.x ? 1.0 : -1.0)
  21         let upperAngle = -CGFloat.pi / 4.0
  22         let lowerAngle = CGFloat.pi / 4.0
  23
  24         let offsetOrigin = CGPoint(x: origin.x + multiplier * (vertexSize.width / 2.0), y: origin.y)
  25         let offsetDestination = CGPoint(
  26           x: destination.x - multiplier * (vertexSize.width / 2.0), y: destination.y)
  27
  28         path.move(to: offsetOrigin)
  29         path.addLine(to: offsetDestination)
  30
  31         path.move(to: offsetDestination)
  32         path.addLine(
  33           to: CGPoint(
  34             x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle),
  35             y:
  36               offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle)))
  37
  38         path.move(to: offsetDestination)
  39         path.addLine(
  40           to: CGPoint(
  41             x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle),
  42             y:
  43               offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle)))
  44
  45         path.move(to: offsetDestination)
  46         path.closeSubpath()
  47       }.applying(
  48         CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
  49       ).strokedPath(StrokeStyle(lineWidth: lineWidth / 4, dash: [10.0])).stroke(Color.map.opportunityColor)
  50     }
  51   }
  52
  53   func h(_ dimension: CGFloat) -> CGFloat {
  54     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  55   }
  56
  57   func w(_ dimension: CGFloat) -> CGFloat {
  58     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  59   }
  60 }
  61
  62 struct MapOpportunities_Previews: PreviewProvider {
  63   static var previews: some View {
  64     MapOpportunities(
  65       mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
  66       vertexSize: CGSize(width: 25.0, height: 25.0),
  67       opportunities: [
  68         Opportunity(id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2))
  69       ])
  70   }
  71 }