fuookami.ospf.kotlin.utils.math.geometry.Triangle.kt Maven / Gradle / Ivy
package fuookami.ospf.kotlin.utils.math.geometry
import fuookami.ospf.kotlin.utils.math.*
class Triangle, D : Dimension>(
val p1: P,
val p2: P,
val p3: P
) {
init {
assert(p1.size == p2.size)
assert(p2.size == p3.size)
}
val e1: Edge get() = Edge(p1, p2)
val e2: Edge get() = Edge(p2, p3)
val e3: Edge get() = Edge(p3, p1)
// Heron's formula
val area: Flt64 by lazy {
val a = e1.length
val b = e2.length
val c = e3.length
val p = (a + b + c) / Flt64.two
val s = p * (p - a) * (p - b) * (p - c)
s.sqrt().toFlt64()
}
val illegal: Boolean by lazy {
for (i in (0 until p1.size)) {
if (p1[i] eq p2[i] && p2[i] eq p3[i]) {
return@lazy true
}
}
false
}
}
typealias Triangle2 = Triangle
typealias Triangle3 = Triangle