git.r.bdr.sh - rbdr/map/blob - Map/MapRenderComponents/MapOpportunities.swift

   1 //
   2 //  MapEdges.swift
   3 //  Map
   4 //
   5 //  Created by Ruben Beltran del Rio on 2/2/21.
   6 //
   7
   8 import SwiftUI
   9
  10 struct MapOpportunities: View {
  11
  12   @Environment(\.colorScheme) var colorScheme
  13
  14   let mapSize: CGSize
  15   let lineWidth: CGFloat
  16   let vertexSize: CGSize
  17   let opportunities: [Opportunity]
  18
  19   let arrowheadSize = CGFloat(10.0)
  20
  21   var color: Color {
  22     MapColor.colorForScheme(colorScheme).opportunity
  23   }
  24
  25   var body: some View {
  26     ForEach(opportunities, id: \.id) { edge in
  27       Path { path in
  28
  29         // First we transform edges from percentage to map coordinates
  30         let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y))
  31         let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y))
  32
  33         let multiplier = CGFloat(edge.destination.x > edge.origin.x ? 1.0 : -1.0)
  34         let upperAngle = -CGFloat.pi / 4.0
  35         let lowerAngle = CGFloat.pi / 4.0
  36
  37         let offsetOrigin = CGPoint(x: origin.x + multiplier * (vertexSize.width / 2.0), y: origin.y)
  38         let offsetDestination = CGPoint(
  39           x: destination.x - multiplier * (vertexSize.width / 2.0), y: destination.y)
  40
  41         path.move(to: offsetOrigin)
  42         path.addLine(to: offsetDestination)
  43
  44         path.move(to: offsetDestination)
  45         path.addLine(
  46           to: CGPoint(
  47             x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle),
  48             y:
  49               offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle)))
  50
  51         path.move(to: offsetDestination)
  52         path.addLine(
  53           to: CGPoint(
  54             x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle),
  55             y:
  56               offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle)))
  57
  58         path.move(to: offsetDestination)
  59         path.closeSubpath()
  60       }.applying(
  61         CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
  62       ).strokedPath(StrokeStyle(lineWidth: lineWidth * 2, dash: [10.0])).stroke(color)
  63     }
  64   }
  65
  66   func h(_ dimension: CGFloat) -> CGFloat {
  67     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  68   }
  69
  70   func w(_ dimension: CGFloat) -> CGFloat {
  71     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  72   }
  73 }
  74
  75 struct MapOpportunities_Previews: PreviewProvider {
  76   static var previews: some View {
  77     MapOpportunities(
  78       mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
  79       vertexSize: CGSize(width: 25.0, height: 25.0),
  80       opportunities: [
  81         Opportunity(id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2))
  82       ])
  83   }
  84 }