kscript example for how to create ImgLib2 cached cell images and show them in BDV

cachged-image-example.kts

#!/usr/bin/env kscript

@file:MavenRepository("scijava.public", "https://maven.scijava.org/content/groups/public")
@file:DependsOn("sc.fiji:bigdataviewer-vistools:1.0.0-beta-11")

import kotlin.math.pow

import bdv.util.BdvFunctions
import bdv.util.volatiles.VolatileViews
import net.imglib2.Localizable
import net.imglib2.cache.img.CachedCellImg
import net.imglib2.cache.img.RandomAccessibleCacheLoader
import net.imglib2.cache.ref.SoftRefLoaderCache
import net.imglib2.img.basictypeaccess.AccessFlags
import net.imglib2.img.basictypeaccess.array.DoubleArray
import net.imglib2.img.basictypeaccess.volatiles.array.VolatileDoubleArray
import net.imglib2.img.cell.Cell
import net.imglib2.img.cell.CellGrid
import net.imglib2.position.FunctionRandomAccessible
import net.imglib2.type.numeric.RealType
import net.imglib2.type.numeric.real.DoubleType
import java.util.function.BiConsumer
import java.util.function.Supplier

// choose some values
fun RealType<*>.pow(power: Double) = setReal(getRealDouble().pow(power))

fun Localizable.prod(target: RealType<*>, power: Double, factor: Double = 500.0) {
    target.setOne()
    for (d in 0 until this.numDimensions())
        target.mul(factor * this.getDoublePosition(d))
    target.pow(power)
}

val nDim = 3
val power = 1.0 / nDim.toDouble()
val image = FunctionRandomAccessible(
    nDim,
    Supplier { BiConsumer { l: Localizable, t: DoubleType -> l.prod(t, power) } },
    Supplier { DoubleType() })
val grid = CellGrid(longArrayOf(175, 225, 200), intArrayOf(16, 16, 16))
val loader = RandomAccessibleCacheLoader.get<DoubleType, DoubleArray, VolatileDoubleArray>(
    grid,
    image,
    AccessFlags.setOf(AccessFlags.VOLATILE))
val cachedImage = CachedCellImg(
    grid,
    DoubleType(),
    SoftRefLoaderCache<Long, Cell<VolatileDoubleArray>>().withLoader(loader),
    VolatileDoubleArray(1, true))
BdvFunctions.show(VolatileViews.wrapAsVolatile(cachedImage), "image")