Mercurial > gemma
annotate pkg/models/reproject.go @ 1879:9a2fbeaabd52 dev-pdf-generation
merging in from branch default
author | Bernhard Reiter <bernhard@intevation.de> |
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date | Tue, 15 Jan 2019 10:07:10 +0100 |
parents | d753ce6cf588 |
children | 1222b777f51f |
rev | line source |
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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) 2018 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 models |
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15 |
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16 import ( |
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17 "context" |
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18 "database/sql" |
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19 ) |
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20 |
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21 const reprojectSQL = ` |
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22 SELECT ST_X(p), ST_Y(p) |
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23 FROM ST_Transform(ST_SetSRID(ST_MakePoint($1, $2), $3::integer), $4::integer) AS p` |
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24 |
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25 type Reprojector struct { |
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26 stmt *sql.Stmt |
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27 FromEPSG uint32 |
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28 ToEPSG uint32 |
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29 } |
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30 |
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31 func NewReprojector( |
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32 ctx context.Context, |
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33 conn *sql.Conn, |
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34 fromEPSG, toEPSG uint32, |
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35 ) (*Reprojector, error) { |
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36 stmt, err := conn.PrepareContext(ctx, reprojectSQL) |
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37 if err != nil { |
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38 return nil, err |
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39 } |
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40 return &Reprojector{ |
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41 stmt: stmt, |
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42 FromEPSG: fromEPSG, |
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43 ToEPSG: toEPSG, |
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44 }, nil |
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45 } |
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46 |
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47 func (r *Reprojector) Close() error { |
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48 if s := r.stmt; s != nil { |
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49 r.stmt = nil |
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50 return s.Close() |
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51 } |
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52 return nil |
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53 } |
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54 |
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55 func (r *Reprojector) Reproject( |
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56 ctx context.Context, |
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57 x, y float64, |
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58 ) (v, w float64, err error) { |
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59 err = r.stmt.QueryRowContext(ctx, x, y, r.FromEPSG, r.ToEPSG).Scan(&v, &w) |
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60 return |
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61 } |