git.r.bdr.sh - rbdr/map/blob - Map/Presentation/Base Components/MapRender/MapVertices.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 MapVertices: View {
  20
  21   let mapSize: CGSize
  22   let vertexSize: CGSize
  23   let vertices: [Vertex]
  24   let padding = CGFloat(5.0)
  25
  26   var onDragVertex: (Vertex, CGFloat, CGFloat) -> Void = { _, _, _ in }
  27
  28   var body: some View {
  29     ZStack(alignment: .topLeading) {
  30       ForEach(vertices, id: \.id) { vertex in
  31         ZStack(alignment: .topLeading) {
  32           getVertexShape(vertex).fill(Color.map.vertexColor)
  33           Text(vertex.label.replacingOccurrences(of: "\\n", with: "\n")).font(.theme.vertexLabel)
  34             .foregroundColor(.map.labelColor)
  35             .shadow(color: .white, radius: 0, x: -0.5, y: -0.5)
  36             .shadow(color: .white, radius: 0, x: 0.5, y: 0.5)
  37             .offset(
  38               CGSize(
  39                 width: w(vertex.position.x) + vertexSize.width + padding,
  40                 height: h(vertex.position.y) + 7.0))
  41         }.gesture(
  42           DragGesture()
  43             .onChanged { value in
  44               let deltaX = value.startLocation.x - value.location.x
  45               let deltaY = value.startLocation.y - value.location.y
  46               onDragVertex(vertex, deltaX, deltaY)
  47             }
  48         )
  49       }
  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   func getVertexShape(_ vertex: Vertex) -> Path {
  62     switch vertex.shape {
  63     case .circle:
  64       return Path { path in
  65         path.addEllipse(
  66           in: CGRect(
  67             origin: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)), size: vertexSize
  68           ))
  69       }
  70     case .square:
  71       return Path { path in
  72         path.addRect(
  73           CGRect(
  74             x: w(vertex.position.x), y: h(vertex.position.y), width: vertexSize.width,
  75             height: vertexSize.height
  76           ))
  77       }
  78     case .triangle:
  79       return Path { path in
  80         path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
  81         path.addLine(
  82           to: CGPoint(
  83             x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
  84         )
  85         path.addLine(
  86           to: CGPoint(x: w(vertex.position.x) + vertexSize.width / 2.0, y: h(vertex.position.y)))
  87         path.addLine(
  88           to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
  89         path.closeSubpath()
  90       }
  91     case .x:
  92       return Path { path in
  93         path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)))
  94         path.addLine(
  95           to: CGPoint(
  96             x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
  97         )
  98         path.closeSubpath()
  99         path.move(to: CGPoint(x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y)))
 100         path.addLine(
 101           to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
 102         path.closeSubpath()
 103       }.strokedPath(StrokeStyle(lineWidth: 2.0, lineCap: .butt))
 104     }
 105   }
 106 }
 107
 108 #Preview {
 109   MapVertices(
 110     mapSize: CGSize(width: 400.0, height: 400.0), vertexSize: CGSize(width: 25.0, height: 25.0),
 111     vertices: [
 112       Vertex(id: 0, label: "A Circle", position: CGPoint(x: 50.0, y: 50.0)),
 113       Vertex(id: 1, label: "A Square", position: CGPoint(x: 10.0, y: 20.0), shape: .square),
 114       Vertex(id: 2, label: "A triangle", position: CGPoint(x: 25, y: 32.0), shape: .triangle),
 115       Vertex(id: 3, label: "An X", position: CGPoint(x: 70.0, y: 70.0), shape: .x),
 116     ])
 117 }