Module: QuadTile

Defined in:
lib/quad_tile.rb,
lib/quad_tile/version.rb,
ext/quad_tile/quad_tile.c

Constant Summary collapse

VERSION = 
"1.0.1"

Class Method Summary collapse

Class Method Details

.iterate_tiles_for_area(bbox) ⇒ Object 



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# File 'ext/quad_tile/quad_tile.c', line 91

static VALUE iterate_tiles_for_area(VALUE self, VALUE bbox)
{
   unsigned int minx = lon2x(NUM2DBL(rb_iv_get(bbox, "@min_lon")));
   unsigned int maxx = lon2x(NUM2DBL(rb_iv_get(bbox, "@max_lon")));
   unsigned int miny = lat2y(NUM2DBL(rb_iv_get(bbox, "@min_lat")));
   unsigned int maxy = lat2y(NUM2DBL(rb_iv_get(bbox, "@max_lat")));
   tilelist_t   tl = tilelist_for_area(minx, miny, maxx, maxy);

   if (tl.tilec > 0)
   {
      unsigned int first;
      unsigned int last;
      unsigned int t;
      VALUE        a = rb_ary_new();

      qsort(tl.tilev, tl.tilec, sizeof(unsigned int), tile_compare);

      first = last = tl.tilev[0];

      for (t = 1; t < tl.tilec; t++)
      {
         unsigned int tile = tl.tilev[t];

         if (tile == last + 1)
         {
            last = tile;
         }
         else
         {
            rb_ary_store(a, 0, UINT2NUM(first));
            rb_ary_store(a, 1, UINT2NUM(last));
            rb_yield(a);

            first = last = tile;
         }
      }

      rb_ary_store(a, 0, UINT2NUM(first));
      rb_ary_store(a, 1, UINT2NUM(last));
      rb_yield(a);
   }

   free(tl.tilev);

   return Qnil;
}

.sql_for_area(bbox, prefix) ⇒ Object 



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# File 'lib/quad_tile.rb', line 5

def self.sql_for_area(bbox, prefix)
  sql = []
  single = []

  iterate_tiles_for_area(bbox) do |first, last|
    if first == last
      single.push(first)
    else
      sql.push("#{prefix}tile BETWEEN #{first} AND #{last}")
    end
  end

  sql.push("#{prefix}tile IN (#{single.join(',')})") unless single.empty?

  "( " + sql.join(" OR ") + " )"
end

.tile_for_point(lat, lon) ⇒ Object 



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# File 'ext/quad_tile/quad_tile.c', line 58

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));
}

.tile_for_xy(x, y) ⇒ Object 



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# File 'ext/quad_tile/quad_tile.c', line 86

static VALUE tile_for_xy(VALUE self, VALUE x, VALUE y)
{
   return UINT2NUM(xy2tile(NUM2UINT(x), NUM2UINT(y)));
}

.tiles_for_area(bbox) ⇒ Object 



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# File 'ext/quad_tile/quad_tile.c', line 66

static VALUE tiles_for_area(VALUE self, VALUE bbox)
{
   unsigned int minx = lon2x(NUM2DBL(rb_iv_get(bbox, "@min_lon")));
   unsigned int maxx = lon2x(NUM2DBL(rb_iv_get(bbox, "@max_lon")));
   unsigned int miny = lat2y(NUM2DBL(rb_iv_get(bbox, "@min_lat")));
   unsigned int maxy = lat2y(NUM2DBL(rb_iv_get(bbox, "@max_lat")));
   tilelist_t   tl = tilelist_for_area(minx, miny, maxx, maxy);
   VALUE        tiles = rb_ary_new();
   unsigned int t;

   for (t = 0; t < tl.tilec; t++)
   {
      rb_ary_push(tiles, UINT2NUM(tl.tilev[t]));
   }

   free(tl.tilev);

   return tiles;
}