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import ConcaveHull
import SwiftUI
struct MapGroup: View {
let mapSize: CGSize
let vertexSize: CGSize
let group: [Vertex]
let color: Color
let cornerSize = CGSize(width: 2.0, height: 2.0)
var strokeSize: CGFloat { 1.75 * vertexSize.width }
var hull: [CGPoint] {
let groupList = group.map({ vertex in
return [Double(vertex.position.x), Double(vertex.position.y)]
})
let hull = Hull()
let hullPoints = hull.hull(groupList, nil)
return hullPoints.compactMap({ object in
if let point = object as? [Double] {
return CGPoint(x: point[0], y: point[1])
}
return nil
})
}
var body: some View {
Path { path in
var initialMove: CGPoint?
for point in hull {
let offsetPoint = CGPoint(x: w(point.x), y: h(point.y))
if initialMove == nil {
path.move(to: offsetPoint)
initialMove = offsetPoint
} else {
path.addLine(to: offsetPoint)
}
}
if let initialMove = initialMove {
path.addLine(to: initialMove)
}
}
.applying(
CGAffineTransform(translationX: vertexSize.width / 2.0, y: vertexSize.height / 2.0)
)
.fill(color)
.stroke(
color,
style: StrokeStyle(
lineWidth: strokeSize,
lineCap: .round,
lineJoin: .round,
miterLimit: 0,
dash: [],
dashPhase: 0
)
)
}
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 {
MapGroup(
mapSize: CGSize(width: 400.0, height: 400.0), vertexSize: CGSize(width: 25.0, height: 25.0),
group: [
Vertex(id: 0, label: "A Circle", position: CGPoint(x: 50.0, y: 50.0)),
Vertex(id: 1, label: "A Square", position: CGPoint(x: 10.0, y: 20.0), shape: .square),
Vertex(id: 2, label: "A triangle", position: CGPoint(x: 25, y: 32.0), shape: .triangle),
Vertex(id: 3, label: "An X", position: CGPoint(x: 70.0, y: 70.0), shape: .x),
], color: .red)
}
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