commonMain.Region2.kt Maven / Gradle / Ivy

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package org.openrndr.kartifex

import org.openrndr.kartifex.utils.regions.Clip

class Region2(val rings: Array) {
    val bounds: Box2

    constructor(rings: Iterable) : this(
        rings.toList().toTypedArray()
    )

    fun test(p: Vec2): Ring2.Result {
        for (r in rings) {
            val result: Ring2.Result = r.test(p)
            if (result.inside) {
                return if (result.curve == null && r.isClockwise) Ring2.Result.OUTSIDE else result
            }
        }
        return Ring2.Result.OUTSIDE
    }

    operator fun contains(p: Vec2): Boolean {
        return test(p).inside
    }

    /// transforms and set operations
    fun transform(m: Matrix3): Region2 {
        return Region2(
            rings
                .map { r: Ring2 ->
                    r.transform(
                        m
                    )
                }.toTypedArray()
        )
    }

    fun intersection(region: Region2): Region2 {
        return Clip.intersection(this, region)
    }

    fun union(region: Region2): Region2 {
        return Clip.union(this, region)
    }

    fun difference(region: Region2): Region2 {
        return Clip.difference(this, region)
    }

    companion object {
        fun of(vararg rings: Ring2): Region2 {
            return Region2(rings.toList())
        }
    }

    init {
        rings.sortBy { it.area }

        bounds = rings.
            map { r: Ring2 -> r.bounds }
            .fold(Box2.EMPTY) { obj, b -> obj.union(b) }
    }
}