| | 1 | import SwiftUI |
| | 2 | |
| | 3 | struct MapEdges: View { |
| | 4 | |
| | 5 | let mapSize: CGSize |
| | 6 | let lineWidth: CGFloat |
| | 7 | let vertexSize: CGSize |
| | 8 | let edges: [MapEdge] |
| | 9 | |
| | 10 | let arrowheadSize = CGFloat(10.0) |
| | 11 | |
| | 12 | var body: some View { |
| | 13 | ForEach(edges, id: \.id) { edge in |
| | 14 | Path { path in |
| | 15 | |
| | 16 | // First we transform edges from percentage to map coordinates |
| | 17 | let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y)) |
| | 18 | let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y)) |
| | 19 | |
| | 20 | let slope = (destination.y - origin.y) / (destination.x - origin.x) |
| | 21 | let angle = atan(slope) |
| | 22 | let multiplier = CGFloat(slope < 0 ? -1.0 : 1.0) |
| | 23 | let upperAngle = angle - CGFloat.pi / 4.0 |
| | 24 | let lowerAngle = angle + CGFloat.pi / 4.0 |
| | 25 | |
| | 26 | let offsetOrigin = CGPoint( |
| | 27 | x: origin.x + multiplier * (vertexSize.width / 2.0) * cos(angle), |
| | 28 | y: origin.y + multiplier * (vertexSize.height / 2.0) * sin(angle)) |
| | 29 | let offsetDestination = CGPoint( |
| | 30 | x: destination.x - multiplier * (vertexSize.width / 2.0) * cos(angle), |
| | 31 | y: destination.y - multiplier * (vertexSize.height / 2.0) * sin(angle)) |
| | 32 | |
| | 33 | path.move(to: offsetOrigin) |
| | 34 | path.addLine(to: offsetDestination) |
| | 35 | |
| | 36 | if edge.arrowhead { |
| | 37 | path.move(to: offsetDestination) |
| | 38 | path.addLine( |
| | 39 | to: CGPoint( |
| | 40 | x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle), |
| | 41 | y: |
| | 42 | offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle))) |
| | 43 | |
| | 44 | path.move(to: offsetDestination) |
| | 45 | path.addLine( |
| | 46 | to: CGPoint( |
| | 47 | x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle), |
| | 48 | y: |
| | 49 | offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle))) |
| | 50 | } |
| | 51 | path.move(to: offsetDestination) |
| | 52 | path.closeSubpath() |
| | 53 | }.applying( |
| | 54 | CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0) |
| | 55 | ).stroke(Color.map.vertexColor, lineWidth: lineWidth) |
| | 56 | } |
| | 57 | } |
| | 58 | |
| | 59 | func h(_ dimension: CGFloat) -> CGFloat { |
| | 60 | max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0)) |
| | 61 | } |
| | 62 | |
| | 63 | func w(_ dimension: CGFloat) -> CGFloat { |
| | 64 | max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0)) |
| | 65 | } |
| | 66 | } |
| | 67 | |
| | 68 | struct MapEdges_Previews: PreviewProvider { |
| | 69 | static var previews: some View { |
| | 70 | MapEdges( |
| | 71 | mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0, |
| | 72 | vertexSize: CGSize(width: 25.0, height: 25.0), |
| | 73 | edges: [ |
| | 74 | MapEdge( |
| | 75 | id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2), |
| | 76 | arrowhead: true) |
| | 77 | ]) |
| | 78 | } |
| | 79 | } |
git.r.bdr.sh / rbdr / map / blame_incremental