feat: Segmentize for GeosCapi geometries.

README.md

@@ -43,8 +43,7 @@ RGeo works with the following Ruby implementations:
 
 Some features also require the following:
 
-*   GEOS 3.2 or later is highly recommended. (3.3.3 or later preferred.) Some
-    functions will not be available without it. This C/C++ library may be
+*   GEOS 3.10 or later is highly recommended. Some functions will not be available without it. This C/C++ library may be
     available via your operating system's package manager (`sudo aptitude
     install libgeos-dev` for debian based Linux distributions, `yum install geos geos-devel` for redhat based Linux distributions), or you can
     download it from http://trac.osgeo.org/geos

ext/geos_c_impl/geometry.c

@@ -740,6 +740,27 @@ method_geometry_buffer(VALUE self, VALUE distance)
   return result;
 }
 
+static VALUE
+method_geometry_segmentize(VALUE self, VALUE max_segment_length)
+{
+  VALUE result;
+  RGeo_GeometryData* self_data;
+  const GEOSGeometry* self_geom;
+  VALUE factory;
+
+  result = Qnil;
+  self_data = RGEO_GEOMETRY_DATA_PTR(self);
+  self_geom = self_data->geom;
+  if (self_geom) {
+    factory = self_data->factory;
+    result = rgeo_wrap_geos_geometry(
+      factory,
+      GEOSDensify(self_geom, rb_num2dbl(max_segment_length)),
+      Qnil);
+  }
+  return result;
+}
+
 static VALUE
 method_geometry_buffer_with_style(VALUE self,
                                   VALUE distance,
@@ -1308,6 +1329,8 @@ rgeo_init_geos_geometry()
     geos_geometry_methods, "make_valid", method_geometry_make_valid, 0);
   rb_define_method(
     geos_geometry_methods, "polygonize", method_geometry_polygonize, 0);
+  rb_define_method(
+    geos_geometry_methods, "segmentize", method_geometry_segmentize, 1);
 }
 
 RGEO_END_C

test/geos_capi/line_string_test.rb

@@ -52,4 +52,11 @@ def test_polygonize_dangle
 
     assert_equal expected, input.polygonize
   end
+
+  def test_segmentize
+    input = @factory.parse_wkt("LINESTRING(0 0, 0 10)")
+    expected = @factory.parse_wkt("LINESTRING (0 0, 0 5, 0 10)")
+
+    assert_equal expected, input.segmentize(5)
+  end
 end

test/geos_capi/polygon_test.rb

@@ -179,4 +179,11 @@ def test_polygonize
 
     assert_equal expected, input.polygonize
   end
+
+  def test_segmentize
+    input = @factory.parse_wkt("POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0))")
+    expected = @factory.parse_wkt("POLYGON ((0 0, 5 0, 10 0, 10 5, 10 10, 5 10, 0 10, 0 5, 0 0))")
+
+    assert_equal expected, input.segmentize(5)
+  end
 end