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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // | ||
| // Arrow.swift | ||
| // BChess | ||
| // | ||
| // Created by Jean Bovet on 5/17/21. | ||
| // Copyright © 2021 Jean Bovet. All rights reserved. | ||
| // | ||
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| import SwiftUI | ||
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| struct Arrow { | ||
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| var path = Path() | ||
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| init(start a: CGPoint, end b: CGPoint, length: CGFloat) { | ||
| let arrowLength = sqrt(pow(b.x-a.x, 2)+pow(b.y-a.y, 2)) | ||
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| let x = -(b.x - a.x)/arrowLength * length | ||
| let y = -(b.y - a.y)/arrowLength * length | ||
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| let alpha = CGFloat(deg2rad(25)) | ||
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| let c1x = b.x + (x*cos(alpha)-y*sin(alpha)) | ||
| let c1y = b.y + (x*sin(alpha)+y*cos(alpha)) | ||
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| let c2x = b.x + (x*cos(-alpha)-y*sin(-alpha)) | ||
| let c2y = b.y + (x*sin(-alpha)+y*cos(-alpha)) | ||
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| path.move(to: b) | ||
| path.addLine(to: CGPoint(x: c1x, y: c1y)) | ||
| path.addLine(to: CGPoint(x: c2x, y: c2y)) | ||
| path.addLine(to: b) | ||
| path.closeSubpath() | ||
| path.move(to: a) | ||
| path.addLine(to: b) | ||
| } | ||
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| private func deg2rad(_ number: Double) -> Double { | ||
| return number * .pi / 180 | ||
| } | ||
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| } | ||
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| struct Arrow_Previews: PreviewProvider { | ||
| static var previews: some View { | ||
| GeometryReader { geometry in | ||
| let p = Arrow(start: CGPoint(x: 10, y: 10), | ||
| end: CGPoint(x: geometry.size.width - 20, y: geometry.size.height - 20), | ||
| length: 20).path | ||
| p.fill(Color.blue) | ||
| p.stroke(Color.blue, lineWidth: 10) | ||
| } | ||
| } | ||
| } |
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