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annotate chapter10/Spiral.scala @ 0:b316eec6fa7a draft default tip

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add sample files
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 08 Jan 2013 16:41:46 +0900
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 import Element.elem
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3 object Spiral {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4 val space = elem(" ")
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 val corner = elem("+")
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 def spiral(nEdges: Int, direction: Int): Element = {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 if (nEdges == 1)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 elem("+")
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 else {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 val sp = spiral(nEdges - 1, (direction + 3) % 4)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 def verticalBar = elem('|', 1, sp.height)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 def horizontalBar = elem('-', sp.width, 1)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 if (direction == 0)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 (corner beside horizontalBar) above (sp beside space)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 else if (direction == 1)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 (sp above space) beside (corner above verticalBar)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 else if (direction == 2)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 (space beside sp) above (horizontalBar beside corner)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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20 (verticalBar above corner) beside (space above sp)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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21 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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23 def main(args: Array[String]) {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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24 val nSides = args(0).toInt
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25 println(spiral(nSides, 0))
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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26 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 }