Add WKT

spec/geo/coord_spec.cr

@@ -111,6 +111,16 @@ describe Geo::Coord do
     geojson.should be_a(GeoJSON::Coordinates)
   end
 
+  describe "#to_wkt" do
+    it "generates a Well Known Text format" do
+      coord = Geo::Coord.new(50.004444, 36.231389)
+
+      ewkt = coord.to_wkt
+
+      ewkt.should eq "POINT(36.231389 50.004444)"
+    end
+  end
+
   describe "#to_ewkt" do
     it "generates an Extended Well Known Text format" do
       coord = Geo::Coord.new(50.004444, 36.231389)

src/geo/coord.cr

@@ -177,9 +177,8 @@ module Geo
     def to_ewkt(io : IO) : Nil
       # SRID 4326 is used for latitude and longitude
       # https://epsg.org/crs_4326/WGS-84.html
-      io << "SRID=4326;POINT("
-      io << lng << ' ' << lat
-      io << ')'
+      io << "SRID=4326;"
+      to_wkt io
     end
 
     def to_ewkb : Bytes
@@ -197,6 +196,16 @@ module Geo
       bytes
     end
 
+    def to_wkt : String
+      String.build { |str| to_wkt str }
+    end
+
+    def to_wkt(io : IO) : Nil
+      io << "POINT("
+      io << lng << ' ' << lat
+      io << ')'
+    end
+
     def ll
       {lat, lng}
     end