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[orx-shapes] Add simple alphaShape interface

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Edwin Jakobs
2021-11-20 23:53:01 +01:00
parent 085bca0106
commit 43b78954e5
1 changed files with 22 additions and 15 deletions
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11
orx-shapes/src/jvmMain/kotlin/AlphaShape.kt
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@@ -8,6 +8,13 @@ import kotlin.math.min
import kotlin.math.pow import kotlin.math.pow
import kotlin.math.sqrt import kotlin.math.sqrt
/**
* Create an alpha shape from list of [Vector2]
*/
fun List<Vector2>.alphaShape(): Shape {
return AlphaShape(this).createShape()
}
private fun circumradius(p1: Vector2, p2: Vector2, p3: Vector2): Double { private fun circumradius(p1: Vector2, p2: Vector2, p3: Vector2): Double {
val a = (p2 - p1).length val a = (p2 - p1).length
val b = (p3 - p2).length val b = (p3 - p2).length
@@ -96,8 +103,8 @@ class AlphaShape(val points: List<Vector2>) {
* As alpha goes to infinity, the alpha shape becomes equal to the convex hull of the input points. * As alpha goes to infinity, the alpha shape becomes equal to the convex hull of the input points.
* @return A list of [LineSegment]s representing the perimeter of the alpha shape. * @return A list of [LineSegment]s representing the perimeter of the alpha shape.
*/ */
fun createSegments(alpha: Double): List<LineSegment> fun createSegments(alpha: Double): List<LineSegment> =
= createBase(alpha).map { LineSegment(getVec(it.first), getVec(it.second)) } createBase(alpha).map { LineSegment(getVec(it.first), getVec(it.second)) }
private fun getVec(i: Int) = Vector2(delaunay.points[i], delaunay.points[i + 1]) private fun getVec(i: Int) = Vector2(delaunay.points[i], delaunay.points[i + 1])