175 lines
8.4 KiB
Swift
175 lines
8.4 KiB
Swift
import Swift2D
|
|
|
|
struct RectangleProcessor {
|
|
|
|
let rectangle: Rectangle
|
|
|
|
func commands(clockwise: Bool) -> [Path.Command] {
|
|
var rx = rectangle.rx
|
|
var ry = rectangle.ry
|
|
|
|
if let _rx = rx, _rx > (rectangle.width / 2.0) {
|
|
rx = rectangle.width / 2.0
|
|
}
|
|
|
|
if let _ry = ry, _ry > (rectangle.height / 2.0) {
|
|
ry = rectangle.height / 2.0
|
|
}
|
|
|
|
var commands: [Path.Command] = []
|
|
|
|
switch (rx, ry) {
|
|
case (.some(let radiusX), .some(let radiusY)) where radiusX != radiusY:
|
|
// Use Cubic Bezier Curve to form rounded corners
|
|
// TODO: Verify that the control points are right
|
|
|
|
var cp1: Point = .zero
|
|
var cp2: Point = .zero
|
|
var point: Point = Point(x: rectangle.x + radiusX, y: rectangle.y)
|
|
|
|
commands.append(.moveTo(point: point))
|
|
|
|
if clockwise {
|
|
point = .init(x: rectangle.x + rectangle.width - radiusX, y: rectangle.y)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x + rectangle.width, y: rectangle.y)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + radiusY)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height - radiusY)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + rectangle.width - radiusX, y: rectangle.y + rectangle.height)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x + radiusX, y: rectangle.y + rectangle.height)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x, y: rectangle.y + rectangle.height)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x, y: rectangle.y + rectangle.height - radiusY)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x, y: rectangle.y + radiusY)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x, y: rectangle.y)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + radiusX, y: rectangle.y)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
} else {
|
|
cp1 = .init(x: rectangle.x, y: rectangle.y)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x, y: rectangle.y + radiusY)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x, y: rectangle.y + rectangle.height - radiusY)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x, y: rectangle.y + rectangle.height)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + radiusX, y: rectangle.y + rectangle.height)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width - radiusX, y: rectangle.y + rectangle.height)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height - radiusY)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + radiusY)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp1 = .init(x: rectangle.x + rectangle.width, y: rectangle.y)
|
|
cp2 = cp1
|
|
point = .init(x: rectangle.x + rectangle.width - radiusX, y: rectangle.y)
|
|
commands.append(.cubicBezierCurve(cp1: cp1, cp2: cp2, point: point))
|
|
}
|
|
case (.some(let radius), .none), (.none, .some(let radius)), (.some(let radius), _):
|
|
// use Quadratic Bezier Curve to form rounded corners
|
|
|
|
var cp: Point = .zero
|
|
var point: Point = Point(x: rectangle.x + radius, y: rectangle.y)
|
|
|
|
commands.append(.moveTo(point: point))
|
|
|
|
if clockwise {
|
|
point = .init(x: (rectangle.x + rectangle.width) - radius, y: rectangle.y)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x + rectangle.width, y: rectangle.y)
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + radius)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width, y: (rectangle.y + rectangle.height) - radius)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)
|
|
point = .init(x: rectangle.x + rectangle.width - radius, y: rectangle.y + rectangle.height)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x + radius, y: rectangle.y + rectangle.height)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x, y: rectangle.y + rectangle.height)
|
|
point = .init(x: rectangle.x, y: rectangle.y + rectangle.height - radius)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x, y: rectangle.y + radius)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x, y: rectangle.y)
|
|
point = .init(x: rectangle.x + radius, y: rectangle.y)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
} else {
|
|
cp = .init(x: rectangle.x, y: rectangle.y)
|
|
point = .init(x: rectangle.x, y: rectangle.y + radius)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x, y: rectangle.y + rectangle.height - radius)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x, y: rectangle.y + rectangle.height)
|
|
point = .init(x: rectangle.x + radius, y: rectangle.y + rectangle.height)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width - radius, y: rectangle.y + rectangle.height)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height - radius)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
|
|
point = .init(x: rectangle.x + rectangle.width, y: rectangle.y + radius)
|
|
commands.append(.lineTo(point: point))
|
|
|
|
cp = .init(x: rectangle.x + rectangle.width, y: rectangle.y)
|
|
point = .init(x: rectangle.x + rectangle.width - radius, y: rectangle.y)
|
|
commands.append(.quadraticBezierCurve(cp: cp, point: point))
|
|
}
|
|
case (.none, .none):
|
|
// draw three line segments.
|
|
commands.append(.moveTo(point: Point(x: rectangle.x, y: rectangle.y)))
|
|
|
|
if clockwise {
|
|
commands.append(.lineTo(point: Point(x: rectangle.x + rectangle.width, y: rectangle.y)))
|
|
commands.append(.lineTo(point: Point(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)))
|
|
commands.append(.lineTo(point: Point(x: rectangle.x, y: rectangle.y + rectangle.height)))
|
|
} else {
|
|
commands.append(.lineTo(point: Point(x: rectangle.x, y: rectangle.y + rectangle.height)))
|
|
commands.append(.lineTo(point: Point(x: rectangle.x + rectangle.width, y: rectangle.y + rectangle.height)))
|
|
commands.append(.lineTo(point: Point(x: rectangle.x + rectangle.width, y: rectangle.y)))
|
|
}
|
|
}
|
|
|
|
commands.append(.closePath)
|
|
|
|
return commands
|
|
}
|
|
}
|