DBot/KStarbound
DBot/KStarbound
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bring back very thin boxes instead of lines

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DBotThePony 2023-12-01 13:47:44 +07:00
parent 4db69db0cd
commit 2793154bbb
Signed by: DBot
GPG Key ID: DCC23B5715498507
1 changed files with 14 additions and 6 deletions
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20
src/main/kotlin/ru/dbotthepony/kstarbound/world/physics/Poly.kt
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@ -26,18 +26,26 @@ import kotlin.math.sin
private fun calculateEdges(points: List<Vector2d>): Pair<ImmutableList<Poly.Edge>, ImmutableList<Vector2d>> { private fun calculateEdges(points: List<Vector2d>): Pair<ImmutableList<Poly.Edge>, ImmutableList<Vector2d>> {
require(points.size >= 2) { "Provided poly is invalid (only ${points.size} points are defined)" } require(points.size >= 2) { "Provided poly is invalid (only ${points.size} points are defined)" }
val edges = ImmutableList.Builder<Poly.Edge>()
if (points.size == 2) { if (points.size == 2) {
// line, to make it one faced, we need to make only one edge // line...
// while double edged line seems to work fine
// for more stable collision detection lets make it a very thin rectangle
val newPoints = ImmutableList.Builder<Vector2d>()
val (p0, p1) = points val (p0, p1) = points
val diff = (p1 - p0).unitVector val diff = (p1 - p0).unitVector
val normal = Vector2d(-diff.y, diff.x) val normal = Vector2d(-diff.y, diff.x)
edges.add(Poly.Edge(p0, p1, normal)) newPoints.add(p0 + normal * 0.001)
newPoints.add(p1 + normal * 0.001)
newPoints.add(p1 - normal * 0.001)
newPoints.add(p0 - normal * 0.001)
return calculateEdges(newPoints.build())
} else { } else {
val edges = ImmutableList.Builder<Poly.Edge>()
for (i in points.indices) { for (i in points.indices) {
val p0 = points[i] val p0 = points[i]
val p1 = points[(i + 1) % points.size] val p1 = points[(i + 1) % points.size]
@ -47,9 +55,9 @@ private fun calculateEdges(points: List<Vector2d>): Pair<ImmutableList<Poly.Edge
edges.add(Poly.Edge(p0, p1, normal)) edges.add(Poly.Edge(p0, p1, normal))
} }
}
return edges.build() to ImmutableList.copyOf(points) return edges.build() to ImmutableList.copyOf(points)
}
} }
private fun rotate(point: Vector2d, sin: Double, cos: Double): Vector2d { private fun rotate(point: Vector2d, sin: Double, cos: Double): Vector2d {