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

   1 // Copyright (C) 2024 Rubén Beltrán del Río
   2
   3 // This program is free software: you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License as published by
   5 // the Free Software Foundation, either version 3 of the License, or
   6 // (at your option) any later version.
   7
   8 // This program is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 // GNU General Public License for more details.
  12
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program. If not, see https://map.tranquil.systems.
  15 import SwiftUI
  16
  17 struct MapOpportunities: View {
  18
  19   let mapSize: CGSize
  20   let lineWidth: CGFloat
  21   let vertexSize: CGSize
  22   let opportunities: [Opportunity]
  23
  24   let arrowheadSize = CGFloat(10.0)
  25
  26   var body: some View {
  27     ForEach(opportunities, id: \.id) { edge in
  28       Path { path in
  29
  30         // First we transform edges from percentage to map coordinates
  31         let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y))
  32         let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y))
  33
  34         let multiplier = CGFloat(edge.destination.x > edge.origin.x ? 1.0 : -1.0)
  35         let upperAngle = -CGFloat.pi / 4.0
  36         let lowerAngle = CGFloat.pi / 4.0
  37
  38         let offsetOrigin = CGPoint(x: origin.x + multiplier * (vertexSize.width / 2.0), y: origin.y)
  39         let offsetDestination = CGPoint(
  40           x: destination.x - multiplier * (vertexSize.width / 2.0), y: destination.y)
  41
  42         path.move(to: offsetOrigin)
  43         path.addLine(to: offsetDestination)
  44
  45         path.move(to: offsetDestination)
  46         path.addLine(
  47           to: CGPoint(
  48             x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle),
  49             y:
  50               offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle)))
  51
  52         path.move(to: offsetDestination)
  53         path.addLine(
  54           to: CGPoint(
  55             x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle),
  56             y:
  57               offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle)))
  58
  59         path.move(to: offsetDestination)
  60         path.closeSubpath()
  61       }.applying(
  62         CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
  63       ).strokedPath(StrokeStyle(lineWidth: lineWidth / 4, dash: [10.0])).stroke(
  64         Color.Map.opportunityColor)
  65     }
  66   }
  67
  68   func h(_ dimension: CGFloat) -> CGFloat {
  69     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  70   }
  71
  72   func w(_ dimension: CGFloat) -> CGFloat {
  73     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  74   }
  75 }
  76
  77 #Preview {
  78   MapOpportunities(
  79     mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
  80     vertexSize: CGSize(width: 25.0, height: 25.0),
  81     opportunities: [
  82       Opportunity(id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2))
  83     ])
  84 }