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

   1 /*
   2  Copyright (C) 2024 Rubén Beltrán del Río
   3
   4  This program is free software: you can redistribute it and/or modify
   5  it under the terms of the GNU General Public License as published by
   6  the Free Software Foundation, either version 3 of the License, or
   7  (at your option) any later version.
   8
   9  This program is distributed in the hope that it will be useful,
  10  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  GNU General Public License for more details.
  13
  14  You should have received a copy of the GNU General Public License
  15  along with this program. If not, see https://map.tranquil.systems.
  16  */
  17 import SwiftUI
  18
  19 struct MapOpportunities: View {
  20
  21   let mapSize: CGSize
  22   let lineWidth: CGFloat
  23   let vertexSize: CGSize
  24   let opportunities: [Opportunity]
  25
  26   let arrowheadSize = CGFloat(10.0)
  27
  28   var body: some View {
  29     ForEach(opportunities, id: \.id) { edge in
  30       Path { path in
  31
  32         // First we transform edges from percentage to map coordinates
  33         let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y))
  34         let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y))
  35
  36         let multiplier = CGFloat(edge.destination.x > edge.origin.x ? 1.0 : -1.0)
  37         let upperAngle = -CGFloat.pi / 4.0
  38         let lowerAngle = CGFloat.pi / 4.0
  39
  40         let offsetOrigin = CGPoint(x: origin.x + multiplier * (vertexSize.width / 2.0), y: origin.y)
  41         let offsetDestination = CGPoint(
  42           x: destination.x - multiplier * (vertexSize.width / 2.0), y: destination.y)
  43
  44         path.move(to: offsetOrigin)
  45         path.addLine(to: offsetDestination)
  46
  47         path.move(to: offsetDestination)
  48         path.addLine(
  49           to: CGPoint(
  50             x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle),
  51             y:
  52               offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle)))
  53
  54         path.move(to: offsetDestination)
  55         path.addLine(
  56           to: CGPoint(
  57             x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle),
  58             y:
  59               offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle)))
  60
  61         path.move(to: offsetDestination)
  62         path.closeSubpath()
  63       }.applying(
  64         CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
  65       ).strokedPath(StrokeStyle(lineWidth: lineWidth / 4, dash: [10.0])).stroke(
  66         Color.map.opportunityColor)
  67     }
  68   }
  69
  70   func h(_ dimension: CGFloat) -> CGFloat {
  71     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  72   }
  73
  74   func w(_ dimension: CGFloat) -> CGFloat {
  75     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  76   }
  77 }
  78
  79 #Preview {
  80   MapOpportunities(
  81     mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
  82     vertexSize: CGSize(width: 25.0, height: 25.0),
  83     opportunities: [
  84       Opportunity(id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2))
  85     ])
  86 }