Mercurial > gemma
annotate pkg/wkb/data.go @ 4296:95786a675d70
WIP: Started with downloading stretches as ESRI shapes.
GET /api/data/stretch/shape/{stretch}
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 30 Aug 2019 18:34:27 +0200 |
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children | 8b730ee6f17b |
rev | line source |
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4296
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WIP: Started with downloading stretches as ESRI shapes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2019 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package wkb |
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15 |
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16 import ( |
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17 "bytes" |
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18 "encoding/binary" |
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19 "fmt" |
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20 "log" |
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21 ) |
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22 |
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23 type ( |
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24 PointGeom struct { |
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25 X float64 |
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26 Y float64 |
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27 } |
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28 LinearRingGeom []PointGeom |
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29 PolygonGeom []LinearRingGeom |
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30 MultiPolygonGeom []PolygonGeom |
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31 ) |
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32 |
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33 func (mpg *MultiPolygonGeom) FromWKB(data []byte) error { |
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34 r := bytes.NewReader(data) |
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35 |
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36 endian, err := r.ReadByte() |
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37 |
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38 var order binary.ByteOrder |
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39 |
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40 switch { |
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41 case err != nil: |
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42 return err |
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43 case endian == NDR: |
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44 order = binary.LittleEndian |
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45 case endian == XDR: |
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46 order = binary.BigEndian |
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47 default: |
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48 return fmt.Errorf("unknown byte order %x", endian) |
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49 } |
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50 |
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51 var geomType uint32 |
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52 err = binary.Read(r, order, &geomType) |
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53 |
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54 switch { |
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55 case err != nil: |
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56 return err |
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57 case geomType != MultiPolygon: |
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58 return fmt.Errorf("unknown geometry type %x", geomType) |
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59 } |
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60 |
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61 var numPolygons int32 |
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62 if err := binary.Read(r, order, &numPolygons); err != nil { |
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63 return err |
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64 } |
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65 log.Printf("info: num polygons: %d\n", numPolygons) |
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66 |
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67 polygons := make([]PolygonGeom, numPolygons) |
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68 |
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69 // TODO: Parse the polygons. |
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70 |
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71 *mpg = polygons |
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72 return nil |
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73 } |