--- /dev/null
+#include "ruby.h"
+#include "quad_tile.h"
+
+static VALUE tile_for_point(VALUE self, VALUE lat, VALUE lon)
+{
+ unsigned int x = lon2x(NUM2DBL(lon));
+ unsigned int y = lat2y(NUM2DBL(lat));
+
+ return UINT2NUM(xy2tile(x, y));
+}
+
+static VALUE tiles_for_area(VALUE self, VALUE minlat, VALUE minlon, VALUE maxlat, VALUE maxlon)
+{
+ unsigned int minx = lon2x(NUM2DBL(minlon));
+ unsigned int maxx = lon2x(NUM2DBL(maxlon));
+ unsigned int miny = lat2y(NUM2DBL(minlat));
+ unsigned int maxy = lat2y(NUM2DBL(maxlat));
+ VALUE tiles = rb_ary_new();
+ unsigned int x;
+ unsigned int y;
+
+ for (x = minx; x <= maxx; x++)
+ {
+ for (y = miny; y <= maxy; y++)
+ {
+ rb_ary_push(tiles, UINT2NUM(xy2tile(x, y)));
+ }
+ }
+
+ return tiles;
+}
+
+static VALUE tile_for_xy(VALUE self, VALUE x, VALUE y)
+{
+ return UINT2NUM(xy2tile(NUM2UINT(x), NUM2UINT(y)));
+}
+
+void Init_quad_tile_so(void)
+{
+ VALUE m = rb_define_module("QuadTile");
+
+ rb_define_module_function(m, "tile_for_point", tile_for_point, 2);
+ rb_define_module_function(m, "tiles_for_area", tiles_for_area, 4);
+ rb_define_module_function(m, "tile_for_xy", tile_for_xy, 2);
+
+ return;
+}