improve tests and interfaces

Author: SimonDanisch

src/basic_types.jl

@@ -165,6 +165,8 @@ end
 Base.show(io::IO, x::LineP) = print(io, "Line(", x[1], " => ", x[2], ")")
 
 """
+    LineString(points::AbstractVector{<:AbstractPoint})
+
 A LineString is a geometry of connected line segments
 """
 struct LineString{
@@ -177,6 +179,7 @@ end
 
 coordinates(x::LineString) = x.points
 
+Base.copy(x::LineString) = LineString(copy(x.points))
 Base.size(x::LineString) = size(coordinates(x))
 Base.getindex(x::LineString, i) = getindex(coordinates(x), i)
 
@@ -231,6 +234,12 @@ function LineString(points::AbstractVector{<: AbstractPoint}, indices::AbstractV
     return LineString(points, faces)
 end
 
+
+"""
+    Polygon(exterior::AbstractVector{<:Point})
+    Polygon(exterior::AbstractVector{<:Point}, interiors::Vector{<:AbstractVector{<:AbstractPoint}})
+
+"""
 struct Polygon{
         Dim, T <: Real,
         P <: AbstractPoint{Dim, T},
@@ -241,6 +250,8 @@ struct Polygon{
     interiors::V
 end
 
+Base.copy(x::Polygon) = Polygon(copy(x.exterior), copy(x.interiors))
+
 Base.:(==)(a::Polygon, b::Polygon) = (a.exterior == b.exterior) && (a.interiors == b.interiors)
 
 function Polygon(exterior::E, interiors::AbstractVector{E}) where E <: AbstractVector{LineP{Dim, T, P}} where {Dim, T, P}
@@ -261,7 +272,9 @@ function Polygon(exterior::AbstractVector{P}, faces::AbstractVector{<: LineFace}
     return Polygon(LineString(exterior, faces))
 end
 
-
+"""
+    MultiPolygon(polygons::AbstractPolygon)
+"""
 struct MultiPolygon{
         Dim, T <: Real,
         Element <: AbstractPolygon{Dim, T},