maybe this is a stupid question, but I'm trying to apply a transformation to a path as simple as this:
let path = UIBezierPath(rect: CGRect(x: 10, y: 10, width: 20, height: 20))
path.apply(CGAffineTransform(rotationAngle: 2.0))
"colorLiteral".setFill()
path.fill()
And seems like the fact of adding the "apply" line, completely erases the shape on the view, whereas if I don't include that line, the shape appears on its place correctly.
I'm quite new at Swift so I guess I'm missing an important step on this?
Thanks all!
Try this and remember rotationAngle takes Radians.
let bounds = CGRect(x: 10, y: 10, width: 20, height: 20)
let path = UIBezierPath(rect: bounds)
path.apply(CGAffineTransform(translationX: -bounds.midX, y: -bounds.midY))
path.apply(CGAffineTransform(rotationAngle: CGFloat.pi / 4))
path.apply(CGAffineTransform(translationX: bounds.midX, y: bounds.midY))
Using CATransform3D
shapeLayer.transform = CATransform3DMakeScale(1, -1, 1)
Transforming path,
let shapeBounds = shapeLayer.bounds
let mirror = CGAffineTransform(scaleX: 1,
y: -1)
let translate = CGAffineTransform(translationX: 0,
y: shapeBounds.size.height)
let concatenated = mirror.concatenating(translate)
bezierPath.apply(concatenated)
shapeLayer.path = bezierPath.cgPath
Transforming layer,
let shapeFrame = CGRect(x: -120, y: 120, width: 350, height: 350)
let mirrorUpsideDown = CGAffineTransform(scaleX: 1,
y: -1)
shapeLayer.setAffineTransform(mirrorUpsideDown)
shapeLayer.frame = shapeFrame
Related
How can I give corner radius in one side to Imageview like zig zag?
like in image
In this image I want like a large image witch is highlighted in Blue line.
If anyone know about this Please help me.
And I apologize if I could not explane my problem properly.
Solve the problem using bezier path
Study the bezier path principle and find the appropriate control point
Here is the sample code
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height/3))
let path = UIBezierPath()
path.move(to: CGPoint(x: 0.0, y: 0.0))
path.addLine(to: CGPoint(x: self.view.frame.width, y: 0))
path.addLine(to: CGPoint(x: self.view.frame.width, y: self.view.frame.size.height/3))
path.addCurve(to: CGPoint(x: 0, y: self.view.frame.size.height/3 - 50),
controlPoint1: CGPoint(x: 200, y: self.view.frame.size.height/3 - 20),
controlPoint2: CGPoint(x: self.view.frame.width/2, y: self.view.frame.size.height/3 - 100))
path.close()
let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath
imageView.layer.mask = shapeLayer
imageView.image = UIImage(named: "spider.jpg")
self.view.addSubview(imageView)
I've managed to draw a speech bubble with following code:
override func draw(_ rect: CGRect) {
let rounding:CGFloat = rect.width * 0.01
//Draw the main frame
let bubbleFrame = CGRect(x: 0, y: 0, width: rect.width, height: rect.height * 6 / 7)
let bubblePath = UIBezierPath(roundedRect: bubbleFrame,
byRoundingCorners: UIRectCorner.allCorners,
cornerRadii: CGSize(width: rounding, height: rounding))
//Color the bubbleFrame
color.setStroke()
color.setFill()
bubblePath.stroke()
bubblePath.fill()
//Add the point
let context = UIGraphicsGetCurrentContext()
//Start the line
context!.beginPath()
context?.move(to: CGPoint(x: bubbleFrame.minX + bubbleFrame.width * 1/2 - 8, y: bubbleFrame.maxY))
//Draw a rounded point
context?.addArc(tangent1End: CGPoint(x: rect.maxX * 1/2 + 4, y: rect.maxY), tangent2End: CGPoint(x:bubbleFrame.maxX , y: bubbleFrame.minY), radius: 0)
//Close the line
context?.addLine(to: CGPoint(x: bubbleFrame.minX + bubbleFrame.width * 1/2 + 16, y: bubbleFrame.maxY))
context!.closePath()
//fill the color
context?.setFillColor(UIColor.white.cgColor)
context?.fillPath()
context?.saveGState()
context?.setShadow(offset:CGSize(width: 1, height: 1), blur: 2, color: UIColor.gray.cgColor)
UIColor.gray.setStroke()
bubblePath.lineWidth = 0.5
bubblePath.stroke()
context?.restoreGState()
}
At the moment, it looks like this:
I seem to be having trouble adding a shadow effect to the speech bubble. I want the point at the bottom to have the shadow effect, no just the rectangle above. Also, the shadow/border at the top is too thick. This is the end result I'm looking to achieve:
I have a UIBezierPath thats a rounded square. It somewhat looks like this:
Here's my code for the shape:
let shape = SKShapeNode()
shape.path = UIBezierPath(roundedRect: CGRect(x:(0), y: (0), width: (250), height: (400)), cornerRadius: 64).cgPath
shape.position = CGPoint(x: 0, y: 0)
print(shape.position)
shape.fillColor = UIColor.white
shape.strokeColor = UIColor.white
shape.lineWidth = 5
addChild(shape)
I want to center it in the middle of the screen, but using
shape.position = CGPoint(x: self.frame.width, y: self.frame.height)
doesn't work. Thanks!
I suggest that you center the UIBezierPath within the shape node. For example,
let width:CGFloat = 250
let height:CGFloat = 400
shape.path = UIBezierPath(roundedRect: CGRect(x:-width/2, y: -height/2, width: width, height: height), cornerRadius: 64).cgPath
You can center the shape in the scene by setting its position to (0, 0).
How to set gradient left to right?
let uiview : UIView = UIView.init(frame: CGRect(x: 50, y: 100, width: 100, height: 10))
let gradient = CAGradientLayer()
gradient.frame = uiview.bounds
gradient.colors = [UIColor.whiteColor().CGColor, UIColor.lightGrayColor().CGColor]
gradient.startPoint = CGPoint(x: 0, y: 0.5)
gradient.endPoint = CGPoint(x: 1, y: 0.5)
uiview.layer.insertSublayer(gradient, atIndex: 0)
self.view.addSubview(uiview)
Take a look at CAGradientLayer - Core Animation | Apple Developer Documentation
Try something like:
let radians: CGFloat = CGFloat.pi
let x: CGFloat = 0.0
let y: CGFloat = 0.0
let z: CGFloat = 1.0
gradient.transform = CATransform3DMakeRotation(radians, x, y, z)
Of course, you can play around with the values till you get the exact result you want.
I have a strange question. Even though I did read a lot of tutorials on how to do this, the final result only shows the bezier line, not any shadow whatsoever. My code is pretty simple :
let borderLine = UIBezierPath()
borderLine.moveToPoint(CGPoint(x:0, y: y! - 1))
borderLine.addLineToPoint(CGPoint(x: x!, y: y! - 1))
borderLine.lineWidth = 2
UIColor.blackColor().setStroke()
borderLine.stroke()
let shadowLayer = CAShapeLayer()
shadowLayer.shadowOpacity = 1
shadowLayer.shadowOffset = CGSize(width: 0,height: 1)
shadowLayer.shadowColor = UIColor.redColor().CGColor
shadowLayer.shadowRadius = 1
shadowLayer.masksToBounds = false
shadowLayer.shadowPath = borderLine.CGPath
self.layer.addSublayer(shadowLayer)
What am I doing wrong as I dont seem to see anything wrong but of course I am wrong since no shadow appears. The function is drawRect, basic UIVIew no extra anything in there, x and y are the width and height of the frame. Many thanks in advance!
I take this example straight from my PaintCode-app. Hope this helps.
//// General Declarations
let context = UIGraphicsGetCurrentContext()
//// Shadow Declarations
let shadow = UIColor.blackColor()
let shadowOffset = CGSizeMake(3.1, 3.1)
let shadowBlurRadius: CGFloat = 5
//// Bezier 2 Drawing
var bezier2Path = UIBezierPath()
bezier2Path.moveToPoint(CGPointMake(30.5, 90.5))
bezier2Path.addLineToPoint(CGPointMake(115.5, 90.5))
CGContextSaveGState(context)
CGContextSetShadowWithColor(context, shadowOffset, shadowBlurRadius, (shadow as UIColor).CGColor)
UIColor.blackColor().setStroke()
bezier2Path.lineWidth = 1
bezier2Path.stroke()
CGContextRestoreGState(context)
I prefer the way to add a shadow-sublayer. You can easily use the following function (Swift 3.0):
func createShadowLayer() -> CALayer {
let shadowLayer = CALayer()
shadowLayer.shadowColor = UIColor.red.cgColor
shadowLayer.shadowOffset = CGSize.zero
shadowLayer.shadowRadius = 5.0
shadowLayer.shadowOpacity = 0.8
shadowLayer.backgroundColor = UIColor.clear.cgColor
return shadowLayer
}
And finally, you just add it to your line path (CAShapeLayer):
let line = CAShapeLayer()
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: 0))
path.addLine(to: CGPoint(x: 50, y: 100))
path.addLine(to: CGPoint(x: 100, y: 50))
line.path = path.cgPath
line.strokeColor = UIColor.blue.cgColor
line.fillColor = UIColor.clear.cgColor
line.lineWidth = 2.0
view.layer.addSublayer(line)
let shadowSubLayer = createShadowLayer()
shadowSubLayer.insertSublayer(line, at: 0)
view.layer.addSublayer(shadowSubLayer)
I am using the shadow properties of my shape layer to add shadow to it. The best part of this approach is that I don't have to provide a path explicitly. The shadow follows the path of the layer. I am also animating the layer by changing path. In that case too the shadow animates seamlessly without a single line of code.
Here is what I am doing (Swift 4.2)
shapeLayer.path = curveShapePath(postion: initialPosition)
shapeLayer.strokeColor = UIColor.clear.cgColor
shapeLayer.fillColor = shapeBackgroundColor
self.layer.addSublayer(shapeLayer)
if shadow {
shapeLayer.shadowRadius = 5.0
shapeLayer.shadowColor = UIColor.gray.cgColor
shapeLayer.shadowOpacity = 0.8
}
The curveShapePath method is the one that returns the path and is defined as follows:
func curveShapePath(postion: CGFloat) -> CGPath {
let height: CGFloat = 37.0
let path = UIBezierPath()
path.move(to: CGPoint(x: 0, y: 0)) // start top left
path.addLine(to: CGPoint(x: (postion - height * 2), y: 0)) // the beginning of the trough
// first curve down
path.addCurve(to: CGPoint(x: postion, y: height),
controlPoint1: CGPoint(x: (postion - 30), y: 0), controlPoint2: CGPoint(x: postion - 35, y: height))
// second curve up
path.addCurve(to: CGPoint(x: (postion + height * 2), y: 0),
controlPoint1: CGPoint(x: postion + 35, y: height), controlPoint2: CGPoint(x: (postion + 30), y: 0))
// complete the rect
path.addLine(to: CGPoint(x: self.frame.width, y: 0))
path.addLine(to: CGPoint(x: self.frame.width, y: self.frame.height))
path.addLine(to: CGPoint(x: 0, y: self.frame.height))
path.close()
return path.cgPath
}