no.arktekk.atom.extension.georss.Polygon.scala Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2012 Arktekk AS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package no.arktekk.atom.extension.georss


/**
 * http://georss.org/simple
 *
 * @author Erlend Hamnaberg
 */
case class Polygon private[georss](points: Seq[Point]) {
  def toValue(format: String) = points.map(_.toValue(format)).mkString(" ")
}

object Polygon {
  def apply(first: Point, second: Point, third: Point, rest: Point*): Polygon = {
    if (rest.lastOption == Some(first)) {
      Polygon(List(first, second, third) ++ rest)
    }
    else {
      Polygon(List(first, second, third) ++ rest ++ List(first))
    }
  }

  def apply(input: String): Option[Polygon] = {
    val seq = input.trim().split(" ").grouped(2).map {
      case Array(x, y) => Point(x.toDouble, y.toDouble)
      case x => sys.error("Unexpected length of array, expected 2 but was: " + x.length)
    }.toList
    seq match {
      case a :: b :: c :: rest if (rest.lastOption == Some(a)) => Some(Polygon(a :: b :: c :: rest))
      case _ => None
    }
  }
}