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// Copyright (C) 2024 Rubén Beltrán del Río
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see https://map.tranquil.systems.
import SwiftUI
struct MapVertices: View {
let mapSize: CGSize
let vertexSize: CGSize
let vertices: [Vertex]
let labelPositions: [Int: CGPoint]
let padding = CGFloat(5.0)
@State private var offset = CGSize.zero
@State private var draggingVertex: Vertex? = nil
var onDragVertex: (Vertex, CGFloat, CGFloat) -> Void = { _, _, _ in }
var body: some View {
ZStack(alignment: .topLeading) {
ForEach(vertices, id: \.id) { vertex in
ZStack(alignment: .topLeading) {
getVertexShape(vertex)
.fill(Color.Theme.Map.vertexColor)
.offset(
x: vertex == draggingVertex ? offset.width : 0,
y: vertex == draggingVertex ? offset.height : 0)
// Drag Hit box. Path bounds seem to be infinite.
Rectangle()
.fill(Color.black.opacity(0.001))
.frame(width: vertexSize.width, height: vertexSize.height)
.offset(x: w(vertex.position.x), y: h(vertex.position.y))
.onHover { isHovering in
if isHovering {
NSCursor.pointingHand.set()
} else {
NSCursor.arrow.set()
}
}
.gesture(
DragGesture()
.onChanged { value in
offset = value.translation
draggingVertex = vertex
NSCursor.closedHand.set()
}
.onEnded { value in
let newX = mw(w(vertex.position.x) + value.translation.width)
let newY = mh(h(vertex.position.y) + value.translation.height)
onDragVertex(vertex, newX, newY)
NSCursor.pointingHand.set()
}
)
Text(vertex.label.replacingOccurrences(of: "\\n", with: "\n"))
.font(.Theme.Map.vertexLabel)
.lineSpacing(
Dimensions.LineHeight.Map.vertexLabel - Dimensions.FontSize.Map.vertexLabel
)
.foregroundColor(.Theme.Map.labelColor)
.offset(
CGSize(
width: labelPositions[vertex.id]?.x
?? (w(vertex.position.x) + vertexSize.width + padding),
height: labelPositions[vertex.id]?.y ?? (h(vertex.position.y) + 7.0))
)
.offset(
x: vertex == draggingVertex ? offset.width : 0,
y: vertex == draggingVertex ? offset.height : 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))
}
func mh(_ dimension: CGFloat) -> CGFloat {
max(0.0, min(100, dimension * 100 / mapSize.height))
}
func mw(_ dimension: CGFloat) -> CGFloat {
max(0.0, min(100, dimension * 100 / mapSize.width))
}
func getVertexShape(_ vertex: Vertex) -> Path {
switch vertex.shape {
case .circle:
return Path { path in
path.addEllipse(
in: CGRect(
origin: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)), size: vertexSize
))
}
case .square:
return Path { path in
path.addRect(
CGRect(
x: w(vertex.position.x), y: h(vertex.position.y), width: vertexSize.width,
height: vertexSize.height
))
}
case .triangle:
return Path { path in
path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
path.addLine(
to: CGPoint(
x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
)
path.addLine(
to: CGPoint(x: w(vertex.position.x) + vertexSize.width / 2.0, y: h(vertex.position.y)))
path.addLine(
to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
path.closeSubpath()
}
case .xMark:
return Path { path in
path.move(to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y)))
path.addLine(
to: CGPoint(
x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y) + vertexSize.height)
)
path.closeSubpath()
path.move(to: CGPoint(x: w(vertex.position.x) + vertexSize.width, y: h(vertex.position.y)))
path.addLine(
to: CGPoint(x: w(vertex.position.x), y: h(vertex.position.y) + vertexSize.height))
path.closeSubpath()
}.strokedPath(StrokeStyle(lineWidth: 2.0, lineCap: .butt))
}
}
}
#Preview {
MapVertices(
mapSize: CGSize(width: 400.0, height: 400.0), vertexSize: CGSize(width: 25.0, height: 25.0),
vertices: [
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: .xMark),
],
labelPositions: [:])
}
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