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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 MapOpportunities: View {
let mapSize: CGSize
let lineWidth: CGFloat
let vertexSize: CGSize
let opportunities: [Opportunity]
let arrowheadSize = CGFloat(10.0)
var body: some View {
ForEach(opportunities, 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 multiplier = CGFloat(edge.destination.x > edge.origin.x ? 1.0 : -1.0)
let upperAngle = -CGFloat.pi / 4.0
let lowerAngle = CGFloat.pi / 4.0
let offsetOrigin = CGPoint(x: origin.x + multiplier * (vertexSize.width / 2.0), y: origin.y)
let offsetDestination = CGPoint(
x: destination.x - multiplier * (vertexSize.width / 2.0), y: destination.y)
path.move(to: offsetOrigin)
path.addLine(to: offsetDestination)
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)
).strokedPath(StrokeStyle(lineWidth: lineWidth / 4, dash: [10.0])).stroke(
Color.map.opportunityColor)
}
}
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 {
MapOpportunities(
mapSize: CGSize(width: 400.0, height: 400.0), lineWidth: 1.0,
vertexSize: CGSize(width: 25.0, height: 25.0),
opportunities: [
Opportunity(id: 1, origin: CGPoint(x: 2.0, y: 34.0), destination: CGPoint(x: 23.0, y: 76.2))
])
}
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