iOS animate/morph shape from circle to square

by

After playing with it for a little while in the playground I noticed that each arc adds two segments to the bezier path, not just one. Moreover, calling closePath adds two more. So to keep the number of segments consistent, I ended up with adding fake segments to my square path. The code is in Swift, but I think it doesn’t matter.

func circlePathWithCenter(center: CGPoint, radius: CGFloat) -> UIBezierPath {
    let circlePath = UIBezierPath()
    circlePath.addArcWithCenter(center, radius: radius, startAngle: -CGFloat(M_PI), endAngle: -CGFloat(M_PI/2), clockwise: true)
    circlePath.addArcWithCenter(center, radius: radius, startAngle: -CGFloat(M_PI/2), endAngle: 0, clockwise: true)
    circlePath.addArcWithCenter(center, radius: radius, startAngle: 0, endAngle: CGFloat(M_PI/2), clockwise: true)
    circlePath.addArcWithCenter(center, radius: radius, startAngle: CGFloat(M_PI/2), endAngle: CGFloat(M_PI), clockwise: true)
    circlePath.closePath()
    return circlePath
}

func squarePathWithCenter(center: CGPoint, side: CGFloat) -> UIBezierPath {
    let squarePath = UIBezierPath()
    let startX = center.x - side / 2
    let startY = center.y - side / 2
    squarePath.moveToPoint(CGPoint(x: startX, y: startY))
    squarePath.addLineToPoint(squarePath.currentPoint)
    squarePath.addLineToPoint(CGPoint(x: startX + side, y: startY))
    squarePath.addLineToPoint(squarePath.currentPoint)
    squarePath.addLineToPoint(CGPoint(x: startX + side, y: startY + side))
    squarePath.addLineToPoint(squarePath.currentPoint)
    squarePath.addLineToPoint(CGPoint(x: startX, y: startY + side))
    squarePath.addLineToPoint(squarePath.currentPoint)
    squarePath.closePath()
    return squarePath
}

enter image description here

More Related Contents:

  1. CABasicAnimation resets to initial value after animation completes
  2. How do I animate constraint changes?
  3. How do I apply a perspective transform to a UIView?
  4. Fast and Lean PDF Viewer for iPhone / iPad / iOS – tips and hints?
  5. How do I adjust the anchor point of a CALayer, when Auto Layout is being used?
  6. UIView with rounded corners and drop shadow?
  7. UIView Infinite 360 degree rotation animation?
  8. How to create a UIView bounce animation?
  9. Are NSLayoutConstraints animatable? [duplicate]
  10. UITableView row animation duration and completion callback
  11. UIStackView Hide View Animation
  12. UIImage from CALayer in iOS
  13. How to create a circular progress indicator for a count down timer
  14. UILabel layer cornerRadius negatively impacting performance
  15. How do you achieve a “clock wipe”/ radial wipe effect in iOS?
  16. CALayer with transparent hole in it
  17. Why masksToBounds = YES prevents CALayer shadow?
  18. UIView shake animation
  19. Showing pushviewcontroller animation look like presentModalViewController
  20. How to rotate image in Swift?
  21. How to animate the change of image in an UIImageView?
  22. add UIImage in CALayer
  23. Swift – Cut hole in shadow layer
  24. UIBezierPath Triangle with rounded edges
  25. How is the relation between UIView’s clipsToBounds and CALayer’s masksToBounds?
  26. SwiftUI withAnimation completion callback
  27. How to draw radial gradients in a CALayer?
  28. How to draw a circle path with color gradient stroke
  29. Sharing an Image between two viewControllers during a transition animation
  30. How to do a native “Pulse effect” animation on a UIButton – iOS

Leave a Comment