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import SwiftUI
struct MapEdges: View {
let mapSize: CGSize
let lineWidth: CGFloat
let vertexSize: CGSize
let edges: [MapEdge]
let arrowheadSize = CGFloat(10.0)
var body: some View {
ForEach(edges, id: \.id) { edge in
Path { path in
// First we transform edges from percentage to map coordinates
let origin = CGPoint(x: w(edge.origin.x), y: h(edge.origin.y))
let destination = CGPoint(x: w(edge.destination.x), y: h(edge.destination.y))
let slope = (destination.y - origin.y) / (destination.x - origin.x)
let angle = atan(slope)
let multiplier = CGFloat(slope < 0 ? -1.0 : 1.0)
let upperAngle = angle - CGFloat.pi / 4.0
let lowerAngle = angle + CGFloat.pi / 4.0
let offsetOrigin = CGPoint(
x: origin.x + multiplier * (vertexSize.width / 2.0) * cos(angle),
y: origin.y + multiplier * (vertexSize.height / 2.0) * sin(angle))
let offsetDestination = CGPoint(
x: destination.x - multiplier * (vertexSize.width / 2.0) * cos(angle),
y: destination.y - multiplier * (vertexSize.height / 2.0) * sin(angle))
path.move(to: offsetOrigin)
path.addLine(to: offsetDestination)
if edge.arrowhead {
path.move(to: offsetDestination)
path.addLine(
to: CGPoint(
x: offsetDestination.x - multiplier * arrowheadSize * cos(upperAngle),
y:
offsetDestination.y - multiplier * arrowheadSize * sin(upperAngle)))
path.move(to: offsetDestination)
path.addLine(
to: CGPoint(
x: offsetDestination.x - multiplier * arrowheadSize * cos(lowerAngle),
y:
offsetDestination.y - multiplier * arrowheadSize * sin(lowerAngle)))
}
path.move(to: offsetDestination)
path.closeSubpath()
}.applying(
CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
).stroke(Color.map.vertexColor, lineWidth: lineWidth)
}
}
func h(_ dimension: CGFloat) -> CGFloat {
max(0.0, min(mapSize.height, dimension * mapSize.height / 100.0))
}
func w(_ dimension: CGFloat) -> CGFloat {
max(0.0, min(mapSize.width, dimension * mapSize.width / 100.0))
}
}
#Preview {
MapEdges(
mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
vertexSize: CGSize(width: 25.0, height: 25.0),
edges: [
MapEdge(
id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2),
arrowhead: true)
])
}
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