Day 20. First attempt at visualization
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Alexander Gehrke
parent
c51316a773
commit
06d7128ac1
4 changed files with 193 additions and 1 deletions
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input/2021/day20-sample1.txt
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@ -2,5 +2,84 @@ package de.qwertyuiop.aoc.`2021`
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import de.qwertyuiop.aoc.lib.*
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import cats.*, cats.implicits.given
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import Vectors.*
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import CanYouEnhanceThat.*
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def day20(using InputSource): Unit = ???
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import java.nio.file.{Files, Paths}
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type Image = Map[Vec2D[Int], Char]
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def day20(using InputSource): Unit =
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val algo :: _ :: values = input(_.map(c => (if c == '#' then '1' else '0')).toVector)
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val image = (for (line, x) <- values.zipWithIndex ; (chr, y) <- line.zipWithIndex yield Vec2D(x, y) -> chr).toMap
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// ZOOM (out), ENHANCE!
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def enhanceN(steps: Int) = enhance(algo, image, 0, values.size - 1)(steps)(renderPBM(-steps, values.size - 1 + steps))
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val (enhanced, enhancedRenders) = enhanceN(2)
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val (veryEnhanced, veryEnhancedRenders) = enhanceN(50)
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/* Visualization!
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* Uncomment, run this, then run:
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*
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* % ffmpeg -r 5 -f image2 -s ${size}x${size} -i /tmp/%02d.pbm -vcodec libx264 -crf 25 -pix_fmt yuv420p ENHANCE.mp4
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*
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* where $size = iterations * 2 + values.size
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*/
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//veryEnhancedRenders.reverse.zipWithIndex.foreach((pbm, i) => Files.writeString(Paths.get(f"/tmp/$i%02d.pbm"), pbm))
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println(s"After 2 iterations: ${enhanced.count((_, c) => c == '1')} lights on")
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println(s"After 50 iterations: ${veryEnhanced.count((_, c) => c == '1')} lights on")
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object CanYouEnhanceThat:
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extension (c: Char)
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def flip = if c == '1' then '0' else '1'
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def enhance[T](algo: Vector[Char], image: Image, min: Int, max: Int, outer: Char = '0', renders: List[T] = Nil)(steps: Int)(renderer: Image => T): (Image, List[T]) =
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def lookup(pos: Vec2D[Int]) =
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val binStr = pos.kernel3x3.map(p => image.getOrElse(p, outer)).mkString
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algo(Integer.parseInt(binStr, 2))
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val rendersNew = renderer(image) :: renders
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if(steps == 0) (image, rendersNew)
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else
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val newImage = (
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for
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x <- (min - 1) to (max + 1)
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y <- (min - 1) to (max + 1)
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yield
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val p = Vec2D(x,y)
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p -> lookup(p)
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).toMap
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enhance(algo, newImage, min - 1, max + 1, if algo(0) == '1' then outer.flip else outer, rendersNew)(steps - 1)(renderer)
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/**
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* Output an Image to the terminal
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*/
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def printImage(image: Image) =
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val min = image.keys.minBy(_.x).x
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val max = image.keys.maxBy(_.x).x
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print("\u001B[H")
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for x <- min - 2 to max + 2 do
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for y <- min - 2 to max + 2 do
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print(image.get(Vec2D(x,y)).map(c => if c == '1' then '#' else ' ').getOrElse(' '))
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println()
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/**
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* Render image as a PBM file. min and max set the range of coordinates to render.
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* This doesn't take the blinking outer part into account, to prevent seizures.
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*/
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def renderPBM(min: Int, max: Int)(image: Image) =
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val width = max - min + 1
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val even = width % 2
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s"P1\n${width + even} ${width + even}\n" +
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(
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for x <- min to max + even yield
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(
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for y <- min to max + even yield image.getOrElse(Vec2D(x,y), '0')
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).mkString(" ")
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).mkString("\n")
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def noop(image: Image): Null = null
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@ -118,6 +118,10 @@ object Vectors:
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def neighbours: Vector[Vec2D[T]] =
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neighbourCoords(2).map(n => a + (n(0), n(1)))
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def kernel3x3: Vector[Vec2D[T]] =
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val (pre,post) = neighbours.splitAt(4)
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pre.appended(a) ++ post
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def orthoNeighbours(sizeX: T, sizeY: T)(using Ordering[T]): Vector[Vec2D[T]] =
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val n = summon[Numeric[T]]
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import math.Ordering.Implicits.infixOrderingOps
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Reference in a new issue