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Basically, I have two points, A and B that are 10 miles apart if you drive. I draw a route using driving directions between them using MapKit.
I want to find point C's latitude and longitude, which is at the point on the route 2 miles from point A. This could also work based on a percentage(ex: 20% of the route is completed between point A and B).
Hopefully, this image can explain better then I can.
Does anyone have any idea on how to do this using Swift and MapKit?
Thanks!
You may want to check out the MKRoute response you receive from the MKDirections.
An MKRoute object defines the geometry for the route—that is, it contains line segments associated with specific map coordinates.
You will find the documentation for MKRoute here:
https://developer.apple.com/documentation/mapkit/mkroute
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I need to measure performance of different swift libraries without writing UI on iPhone. There are many examples of Swift/UI examples that are normally, multi-threaded in nature. So what I want to measure is raw performance without gui overhead, if possible. And the output can we printed into the Xcode 11 console window in debugger, for example. Could you please kindly point me where I could find such sample code ? I would greatly appreciate the help.
This is an example of how to measure the time of a sum of numbers
let numbersArray = [1,2,3,4,5,6,7,8,9,1,2,3,4,5,6]
func showBenchmarkTime(title:String, operation:()->()) {
let startTime = CFAbsoluteTimeGetCurrent()
operation()
let timeElapsed = CFAbsoluteTimeGetCurrent() - startTime
print("Time elapsed for \(title): \(timeElapsed) s.")
}
showBenchmarkTime(title: "sum an array of numbers") {
print(numbersArray.reduce(0, +))
}
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I am working with delphi.How do i get the total number of elements in a stack and retain the stack after the process.I am aware that this can also be achived by creating a temporary stack and copying the original stack to the new one (temp),so as to then pop the elements from the temp while counting, but i am not allowed to use this formular. Can somebody help me with an algorthm that achieves my task please!
If you are using the generic TStack collection class in Delphi XE4 then the number of elements currently in the stack is already exposed directly via the Count property:
var
myStack: TStack<Integer>;
begin
myStack := TStack<Integer>.Create;
myStack.Push(42);
ShowMessageFmt('Stack contains %d elements', [myStack.Count]);
myStack.Free;
end;
However, since you presumably have not found this property then it is possible you are using some other stack implementation.
Determining how best to access the same information about the stack from the implementation you are using is impossible without further details about that particular implementation.
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Is there a way in rails via some mapping API/gem where I can define map areas/map zones (with polygon bounds) and detect if an address falls within a particular zone/area.
This is easily done with geokit.
First construct a polygon from LatLng:
polygon = Geokit::Polygon.new([
Geokit::LatLng.new(0,0),
Geokit::LatLng.new(10,0),
Geokit::LatLng.new(10,10),
Geokit::LatLng.new(20,10),
Geokit::LatLng.new(20,0),
Geokit::LatLng.new(30,0),
Geokit::LatLng.new(30,20),
Geokit::LatLng.new(0,20)
])
Then you can test if the polygon contains a LatLng:
point = Geokit::LatLng.new(5,5)
polygon.contains?(point) # => true
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I have a problem:
My app allow user choose 2 options : Metric or Imperial.
If user select "Metric", height(cm), weight(kg).
If Select "Imperial: height(inch) and weight (lbs).
I need to change value of height from inch to centimeter and weight from lbs to kg.
Example :
user input : 70 (inch) and 120 (lbs) ==> convert to 177.8 (cm) and 54.5 (kg)
Thanks in advance.
The best example of unit convert is below link..
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I'm looking for a way, to get a notification/warning, whenever I'm approaching a certain location.
I'm using a locationManager for receiving new locations as-i-go, and i have an array of CLLocationCoordinate2D-objects. I want to be informed when i'm getting close to one of those objects - say 10 meters or so.
Any suggestions?
Thanks
Use CLLocation:
Create a new CLLocation Object:
- initWithLatitude:longitude:
To determine the distance use:
– distanceFromLocation:
Im not familiar with your code, but this example will push you in the right direction:
CLLocation* firstLocation = [[CLLocation alloc] initWithLatitude:53.481508 longitude:33.398438];
CLLocation* secondLocation = [[CLLocation alloc] initWithLatitude:-13.678013 longitude:-46.40625];
CLLocationDistance distance = [firstLocation distanceFromLocation:secondLocation];
if(distance < 10.00){
NSLog(#"Distance is smaller than 10 meters");
}