extension CGPoint {
var coordx : String {
let xx = spherical(x * 10 * scaleFactor)/10 //No drawback right here
return "(xx)"
}
var coordy : String {
let yy = spherical(y * 10 * scaleFactor)/10 //No drawback right here
return "(yy)"
}
}
extension CGFloat {
var scaled : String {
let yy = spherical(self * 10 * scaleFactor)/10 //This generates an error.
return "(yy)"
}
var scaled2 : String {
return CGPoint(x: self, y: self).coordx //No drawback right here
}
}
Within the above code, I’ve marked with feedback which traces work high quality and which produces an error. There are three errors generated:
Can't convert worth of sort '()' to anticipated argument sort 'Int'
Can't convert worth of sort 'CGFloat' to anticipated argument sort 'FloatingPointRoundingRule'
Can't use mutating member on immutable worth: 'self' is immutable
Why would the CGPoint extension variables work high quality however not the CGFloat extension? I discover with a right-click the y or x variables, I get a popup indicating the variable is a Double. Altering the extension to Double as an alternative of CGFloat does not make a distinction.
The parts of a CGPoint are simply CGFloats, so I am confused why this does not work. I can use scaled2 as a workaround, nevertheless it appears absurd to make a CGPoint from a CGFloat simply to get this to work.
The aim of this code is to encode SVG output, which is finished with strings. I am certain there are different methods to perform this similar process, however I am making an attempt to grasp what’s actually occurring right here.
On different factor, once I option-click on the spherical perform that has an error, it says, doable match:
func spherical(FloatingPointRoundingRule)
If I option-click on the spherical perform of one of many ones that works, I as an alternative get:
func spherical<T>(_ x: T) -> T the place T : FloatingPoint
This means to me that the compiler has chosen a special spherical perform for the 2 eventualities. In an try and pressure one, I typed spherical( and ready for the popup to indicate up, after which I chosen it. That did not assist. Copy/pasting from one of many traces that works to the CGFloat extension after which altering the variable additionally did not work. So, what is going on on her?
