| | 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 MapEdges: View { |
| | 18 | |
| | 19 | let mapSize: CGSize |
| | 20 | let lineWidth: CGFloat |
| | 21 | let vertexSize: CGSize |
| | 22 | let edges: [MapEdge] |
| | 23 | |
| | 24 | let arrowheadSize = CGFloat(10.0) |
| | 25 | |
| | 26 | var body: some View { |
| | 27 | ForEach(edges, 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 slope = (destination.y - origin.y) / (destination.x - origin.x) |
| | 35 | let angle = atan(slope) |
| | 36 | let multiplier = CGFloat(slope < 0 ? -1.0 : 1.0) |
| | 37 | let upperAngle = angle - CGFloat.pi / 4.0 |
| | 38 | let lowerAngle = angle + CGFloat.pi / 4.0 |
| | 39 | |
| | 40 | let offsetOrigin = CGPoint( |
| | 41 | x: origin.x + multiplier * (vertexSize.width / 2.0) * cos(angle), |
| | 42 | y: origin.y + multiplier * (vertexSize.height / 2.0) * sin(angle)) |
| | 43 | let offsetDestination = CGPoint( |
| | 44 | x: destination.x - multiplier * (vertexSize.width / 2.0) * cos(angle), |
| | 45 | y: destination.y - multiplier * (vertexSize.height / 2.0) * sin(angle)) |
| | 46 | |
| | 47 | path.move(to: offsetOrigin) |
| | 48 | path.addLine(to: offsetDestination) |
| | 49 | |
| | 50 | if edge.arrowhead { |
| | 51 | path.move(to: offsetDestination) |
| | 52 | path.addLine( |
| | 53 | to: CGPoint( |
| | 54 | x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle), |
| | 55 | y: |
| | 56 | offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle))) |
| | 57 | |
| | 58 | path.move(to: offsetDestination) |
| | 59 | path.addLine( |
| | 60 | to: CGPoint( |
| | 61 | x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle), |
| | 62 | y: |
| | 63 | offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle))) |
| | 64 | } |
| | 65 | path.move(to: offsetDestination) |
| | 66 | path.closeSubpath() |
| | 67 | }.applying( |
| | 68 | CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0) |
| | 69 | ).stroke(Color.Map.vertexColor, lineWidth: lineWidth) |
| | 70 | } |
| | 71 | } |
| | 72 | |
| | 73 | func h(_ dimension: CGFloat) -> CGFloat { |
| | 74 | max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0)) |
| | 75 | } |
| | 76 | |
| | 77 | func w(_ dimension: CGFloat) -> CGFloat { |
| | 78 | max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0)) |
| | 79 | } |
| | 80 | } |
| | 81 | |
| | 82 | #Preview { |
| | 83 | MapEdges( |
| | 84 | mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0, |
| | 85 | vertexSize: CGSize(width: 25.0, height: 25.0), |
| | 86 | edges: [ |
| | 87 | MapEdge( |
| | 88 | id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2), |
| | 89 | arrowhead: true) |
| | 90 | ]) |
| | 91 | } |
git.r.bdr.sh / rbdr / map / blame_incremental