A collection of small utility functions to scratch some common itches.

libscratch.scala

package libscratch

object `package` {

  def floorDiv(p : Int, q : Int) : Int = 
    if (p < 0) {
      if (q < 0) {
        p / q
      } else {
        (p - q + 1) / q
      }
    } else {
      if (q < 0) {
        (p - q - 1) / q
      } else {
        p / q
      }
    }

  def ceilDiv(p : Int, q : Int) : Int = 
    if (p < 0) {
      if (q < 0) {
        (p + q + 1) / q
      } else {
        p / q
      }
    } else {
      if (q < 0) {
        p / q
      } else {
        (p + q - 1) / q
      }
    }

  def tiledRange(lo : Int, hi : Int, tileSize : Int) : Range =
    floorDiv(lo, tileSize) until ceilDiv(hi, tileSize)
}