git.r.bdr.sh - rbdr/map/blob - Map/Presentation/Base Components/MapRender/MapVertices.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 MapVertices: View {
  18
  19   let mapSize: CGSize
  20   let vertexSize: CGSize
  21   let vertices: [Vertex]
  22   let padding = CGFloat(5.0)
  23
  24   var onDragVertex: (Vertex, CGFloat, CGFloat) -> Void = { _, _, _ in }
  25
  26   var body: some View {
  27     ZStack(alignment: .topLeading) {
  28       ForEach(vertices, id: \.id) { vertex in
  29         ZStack(alignment: .topLeading) {
  30           getVertexShape(vertex).fill(Color.Map.vertexColor)
  31           Text(vertex.label.replacingOccurrences(of: "\\n", with: "\n")).font(.Theme.vertexLabel)
  32             .foregroundColor(.Map.labelColor)
  33             .shadow(color: .white, radius: 0, x: -0.5, y: -0.5)
  34             .shadow(color: .white, radius: 0, x: 0.5, y: 0.5)
  35             .offset(
  36               CGSize(
  37                 width: w(vertex.position.x) + vertexSize.width + padding,
  38                 height: h(vertex.position.y) + 7.0))
  39         }.gesture(
  40           DragGesture()
  41             .onChanged { value in
  42               let deltaX = value.startLocation.x - value.location.x
  43               let deltaY = value.startLocation.y - value.location.y
  44               onDragVertex(vertex, deltaX, deltaY)
  45             }
  46         )
  47       }
  48     }
  49   }
  50
  51   func h(_ dimension: CGFloat) -> CGFloat {
  52     max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
  53   }
  54
  55   func w(_ dimension: CGFloat) -> CGFloat {
  56     max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
  57   }
  58
  59   func getVertexShape(_ vertex: Vertex) -> Path {
  60     switch vertex.shape {
  61     case .circle:
  62       return Path { path in
  63         path.addEllipse(
  64           in: CGRect(
  65             origin: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)), size: vertexSize
  66           ))
  67       }
  68     case .square:
  69       return Path { path in
  70         path.addRect(
  71           CGRect(
  72             x: w(vertex.position.x), y: h(vertex.position.y), width: vertexSize.width,
  73             height: vertexSize.height
  74           ))
  75       }
  76     case .triangle:
  77       return Path { path in
  78         path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
  79         path.addLine(
  80           to: CGPoint(
  81             x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
  82         )
  83         path.addLine(
  84           to: CGPoint(x: w(vertex.position.x) + vertexSize.width / 2.0, y: h(vertex.position.y)))
  85         path.addLine(
  86           to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
  87         path.closeSubpath()
  88       }
  89     case .x:
  90       return Path { path in
  91         path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)))
  92         path.addLine(
  93           to: CGPoint(
  94             x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
  95         )
  96         path.closeSubpath()
  97         path.move(to: CGPoint(x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y)))
  98         path.addLine(
  99           to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
 100         path.closeSubpath()
 101       }.strokedPath(StrokeStyle(lineWidth: 2.0, lineCap: .butt))
 102     }
 103   }
 104 }
 105
 106 #Preview {
 107   MapVertices(
 108     mapSize: CGSize(width: 400.0, height: 400.0), vertexSize: CGSize(width: 25.0, height: 25.0),
 109     vertices: [
 110       Vertex(id: 0, label: "A Circle", position: CGPoint(x: 50.0, y: 50.0)),
 111       Vertex(id: 1, label: "A Square", position: CGPoint(x: 10.0, y: 20.0), shape: .square),
 112       Vertex(id: 2, label: "A triangle", position: CGPoint(x: 25, y: 32.0), shape: .triangle),
 113       Vertex(id: 3, label: "An X", position: CGPoint(x: 70.0, y: 70.0), shape: .x),
 114     ])
 115 }