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actually using (and rediscovering) the kdtree

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This commit is contained in:
minjaesong
2019-04-18 23:42:54 +09:00
parent 21e14babb9
commit c89f602c06
5 changed files with 111 additions and 44 deletions
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45
src/net/torvald/aa/KDHeapifiedTree.kt
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@@ -17,7 +17,7 @@ import net.torvald.terrarum.sqr
* Remarks:
* - NOT using the fullCodePage with 2x2 mode makes it slower... skewed tree generation?
*/
class KDHeapifiedTree() {
class KDHeapifiedTree(actors: List<ActorWBMovable>) {
private val dimension = 2
private val initialSize = 128
@@ -25,8 +25,8 @@ class KDHeapifiedTree() {
private val root: Int = 0
fun findNearest(query: Point2d) =
getNearest(root, query, 0).get()!!
fun findNearestActor(query: Point2d): ActorWBMovable =
getNearest(root, query, 0).getActor()!!
private fun Int.get() = nodes[this]?.feetPosPoint
private fun Int.getActor() = nodes[this]
@@ -38,6 +38,10 @@ class KDHeapifiedTree() {
private val zeroPoint = Point2d(0.0, 0.0)
init {
create(actors, 0, 0)
}
private fun create(points: List<ActorWBMovable?>, depth: Int, index: Int): ActorWBMovable? {
if (points.isEmpty()) {
index.set(null)
@@ -101,38 +105,3 @@ class KDHeapifiedTree() {
private operator fun Point2d.get(index: Int) = if (index == 0) this.x else this.y
}
fun intLog2(number: Int): Int {
var number = number
if (number == 0) return 0
var log = 0
if (number and 0xffff0000.toInt() != 0) {
number = number ushr 16
log = 16
}
if (number >= 256) {
number = number ushr 8
log += 8
}
if (number >= 16) {
number = number ushr 4
log += 4
}
if (number >= 4) {
number = number ushr 2
log += 2
}
return log + number.ushr(1)
}
fun nextPowerOfTwo(number: Int): Int {
var number = number - 1
number = number or (number shr 1)
number = number or (number shr 2)
number = number or (number shr 4)
number = number or (number shr 8)
number = number or (number shr 16)
number++
number += if (number == 0) 1 else 0
return number
}