Example #1
0
        public ICollection <CelestialObject> Search(SkyContext c, string searchString, Func <CelestialObject, bool> filterFunc, int maxCount = 50)
        {
            var match = searchRegex.Match(searchString.ToLowerInvariant());

            if (match.Success)
            {
                int    tyc1 = int.Parse(match.Groups["tyc1"].Value);
                short? tyc2 = match.Groups["tyc2"].Success ? short.Parse(match.Groups["tyc2"].Value) : (short?)null;
                string tyc3 = match.Groups["tyc3"].Value;
                if (tyc1 > 0 && tyc1 <= 9537)
                {
                    Tycho2Region region = IndexRegions.ElementAt(tyc1 - 1);
                    var          stars  = GetStarsInRegion(region, c, tyc2, tyc3);
                    return(stars.Where(filterFunc).Take(maxCount).ToArray());
                }
            }
            return(new CelestialObject[0]);
        }
Example #2
0
        public ICollection <SearchResultItem> Search(SkyContext c, string searchString, int maxCount = 50)
        {
            var match = searchRegex.Match(searchString.ToLowerInvariant());

            if (match.Success)
            {
                int    tyc1 = int.Parse(match.Groups["tyc1"].Value);
                short? tyc2 = match.Groups["tyc2"].Success ? short.Parse(match.Groups["tyc2"].Value) : (short?)null;
                string tyc3 = match.Groups["tyc3"].Value;

                if (tyc1 > 0 && tyc1 <= 9537)
                {
                    Tycho2Region region = IndexRegions.ElementAt(tyc1 - 1);
                    var          stars  = GetStarsInRegion(region, c, tyc2, tyc3);

                    return(stars.Take(maxCount).Select(s => new SearchResultItem(s, s.ToString())).ToList());
                }
            }

            return(new List <SearchResultItem>());
        }
Example #3
0
        private ICollection <Tycho2Star> GetStarsInRegion(Tycho2Region region, SkyContext c, short?tyc2, string tyc3)
        {
            // seek reading position
            CatalogReader.BaseStream.Seek(CATALOG_RECORD_LEN * (region.FirstStarId - 1), SeekOrigin.Begin);

            // count of records in current region
            int count = (int)(region.LastStarId - region.FirstStarId);

            // read region in memory for fast access
            byte[] buffer = CatalogReader.ReadBytes(CATALOG_RECORD_LEN * count);

            var stars = new List <Tycho2Star>();

            for (int i = 0; i < count && stars.Count < 50; i++)
            {
                Tycho2Star star = GetStar(c, buffer, i * CATALOG_RECORD_LEN, tyc2, tyc3);
                if (star != null)
                {
                    stars.Add(star);
                }
            }

            return(stars);
        }
Example #4
0
        private ICollection <Tycho2Star> GetStarsInRegion(SkyContext c, Tycho2Region region, CrdsEquatorial eq, double angle, Func <float, bool> magFilter)
        {
            // seek reading position
            CatalogReader.BaseStream.Seek(CATALOG_RECORD_LEN * (region.FirstStarId - 1), SeekOrigin.Begin);

            // count of records in current region
            int count = (int)(region.LastStarId - region.FirstStarId);

            // read region in memory for fast access
            byte[] buffer = CatalogReader.ReadBytes(CATALOG_RECORD_LEN * count);

            var stars = new List <Tycho2Star>();

            for (int i = 0; i < count; i++)
            {
                Tycho2Star star = GetStar(c, buffer, i * CATALOG_RECORD_LEN, eq, angle, magFilter);
                if (star != null)
                {
                    stars.Add(star);
                }
            }

            return(stars);
        }