ScalaCheck Polymorphic Generators for Latitude and Longitude

CoordinateGen.scala

import org.scalacheck.Gen._

def latitudeGen[T](implicit num: Numeric[T], c: Choose[T]): Gen[T] = {
  import num._
  val min = fromInt(-90)
  val max = fromInt(90)
  Gen.sized(n => c.choose(min, max))
}

def longitudeGen[T](implicit num: Numeric[T], c: Choose[T]): Gen[T] = {
  import num._
  val min = fromInt(-180)
  val max = fromInt(180)
  Gen.sized(n => c.choose(min, max))
}
  
// Example Usage

// Concrete type is inferred (Float)
val x: Float = latitudeGen.sample.get

case class Coordinate(lat: Double, lon: Double)

// Can also supply type (Double)
val coordinateGen: Gen[Coordinate] = for {
  lat <- latitudeGen[Double]
  lon <- longitudeGen[Double]
} yield Coordinate(lat, lon)