如何模糊 NSImage 蒙版的边界?
How to blur the border of the mask for an NSImage?
我正在尝试模糊 swift 中 NSImage 的蒙版边界,但我不知道该怎么做。掩码应该是从 CGMutablePath
创建的,因此可以通过编程方式更改它。这是它现在的样子:
这应该是这样的:
创建具有锐边的蒙版的代码如下:
class MyView: NSView {
override func draw(_ dirtyRect: NSRect) {
let bottomLayer = CALayer()
bottomLayer.bounds = self.bounds
bottomLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
bottomLayer.contents = NSImage(named: "bottom.jpg")
bottomLayer.contentsGravity = .resize
self.layer?.addSublayer(bottomLayer)
let path = CGMutablePath()
path.move(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2))
path.addCurve(to: CGPoint(x: 0.5*self.bounds.size.width, y: self.bounds.size.height), control1: CGPoint(x: 0.4*self.bounds.size.width, y: 0), control2: CGPoint(x: 0, y: self.bounds.size.height))
path.addCurve(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2), control1: CGPoint(x: self.bounds.size.width, y: self.bounds.size.height), control2: CGPoint(x: 0.8*self.bounds.size.width, y: 0))
path.closeSubpath()
let maskLayer = CAShapeLayer()
maskLayer.path = path
maskLayer.fillRule = .evenOdd
maskLayer.borderWidth = 20
let topLayer = CALayer()
topLayer.bounds = self.bounds
topLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
topLayer.contents = NSImage(named: "top.jpg")
topLayer.contentsGravity = .resize
topLayer.masksToBounds = true
topLayer.mask = maskLayer
self.layer?.addSublayer(topLayer)
}
}
我希望有一个好的解决方案:)
弗雷德里克
尝试添加 CAGradientLayer
而不是 CAShapeLayer
:
示例来源:
class MyView: NSView {
override func draw(_ dirtyRect: NSRect) {
let bottomLayer = CALayer()
bottomLayer.bounds = self.bounds
bottomLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
bottomLayer.contents = NSImage(named: "bottom")
bottomLayer.contentsGravity = .resize
self.layer?.addSublayer(bottomLayer)
let path = CGMutablePath()
path.move(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2))
path.addCurve(to: CGPoint(x: 0.5*self.bounds.size.width, y: self.bounds.size.height), control1: CGPoint(x: 0.4*self.bounds.size.width, y: 0), control2: CGPoint(x: 0, y: self.bounds.size.height))
path.addCurve(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2), control1: CGPoint(x: self.bounds.size.width, y: self.bounds.size.height), control2: CGPoint(x: 0.8*self.bounds.size.width, y: 0))
path.closeSubpath()
let maskLayer = CAGradientLayer()
maskLayer.shadowRadius = 4
maskLayer.shadowPath = path
maskLayer.shadowOpacity = 1
maskLayer.shadowOffset = CGSize.zero
maskLayer.shadowColor = NSColor.green.cgColor
let topLayer = CALayer()
topLayer.bounds = self.bounds
topLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
topLayer.contents = NSImage(named: "top")
topLayer.contentsGravity = .resize
topLayer.masksToBounds = true
topLayer.mask = maskLayer
self.layer?.addSublayer(topLayer)
}
}
输出
我正在尝试模糊 swift 中 NSImage 的蒙版边界,但我不知道该怎么做。掩码应该是从 CGMutablePath
创建的,因此可以通过编程方式更改它。这是它现在的样子:
创建具有锐边的蒙版的代码如下:
class MyView: NSView {
override func draw(_ dirtyRect: NSRect) {
let bottomLayer = CALayer()
bottomLayer.bounds = self.bounds
bottomLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
bottomLayer.contents = NSImage(named: "bottom.jpg")
bottomLayer.contentsGravity = .resize
self.layer?.addSublayer(bottomLayer)
let path = CGMutablePath()
path.move(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2))
path.addCurve(to: CGPoint(x: 0.5*self.bounds.size.width, y: self.bounds.size.height), control1: CGPoint(x: 0.4*self.bounds.size.width, y: 0), control2: CGPoint(x: 0, y: self.bounds.size.height))
path.addCurve(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2), control1: CGPoint(x: self.bounds.size.width, y: self.bounds.size.height), control2: CGPoint(x: 0.8*self.bounds.size.width, y: 0))
path.closeSubpath()
let maskLayer = CAShapeLayer()
maskLayer.path = path
maskLayer.fillRule = .evenOdd
maskLayer.borderWidth = 20
let topLayer = CALayer()
topLayer.bounds = self.bounds
topLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
topLayer.contents = NSImage(named: "top.jpg")
topLayer.contentsGravity = .resize
topLayer.masksToBounds = true
topLayer.mask = maskLayer
self.layer?.addSublayer(topLayer)
}
}
我希望有一个好的解决方案:)
弗雷德里克
尝试添加 CAGradientLayer
而不是 CAShapeLayer
:
示例来源:
class MyView: NSView {
override func draw(_ dirtyRect: NSRect) {
let bottomLayer = CALayer()
bottomLayer.bounds = self.bounds
bottomLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
bottomLayer.contents = NSImage(named: "bottom")
bottomLayer.contentsGravity = .resize
self.layer?.addSublayer(bottomLayer)
let path = CGMutablePath()
path.move(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2))
path.addCurve(to: CGPoint(x: 0.5*self.bounds.size.width, y: self.bounds.size.height), control1: CGPoint(x: 0.4*self.bounds.size.width, y: 0), control2: CGPoint(x: 0, y: self.bounds.size.height))
path.addCurve(to: CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2), control1: CGPoint(x: self.bounds.size.width, y: self.bounds.size.height), control2: CGPoint(x: 0.8*self.bounds.size.width, y: 0))
path.closeSubpath()
let maskLayer = CAGradientLayer()
maskLayer.shadowRadius = 4
maskLayer.shadowPath = path
maskLayer.shadowOpacity = 1
maskLayer.shadowOffset = CGSize.zero
maskLayer.shadowColor = NSColor.green.cgColor
let topLayer = CALayer()
topLayer.bounds = self.bounds
topLayer.position = CGPoint(x: self.bounds.size.width/2, y: self.bounds.size.height/2)
topLayer.contents = NSImage(named: "top")
topLayer.contentsGravity = .resize
topLayer.masksToBounds = true
topLayer.mask = maskLayer
self.layer?.addSublayer(topLayer)
}
}