Mercurial > gemma
view pkg/controllers/cross.go @ 1234:1a5564655f2a
refac: Sidebar reorganized
In order to make context switches between administrative tasks
which are map related and those which are system related, we now have
a category "administration" and "systemadministration".
The Riverbedmorphology does nothing than display the map, so it is
renamed to that (map). In case the context of "systemadministration"
is chosen, the "map" brings you just back to the map.
author | Thomas Junk <thomas.junk@intevation.de> |
---|---|
date | Tue, 20 Nov 2018 09:54:53 +0100 |
parents | 936dd3714325 |
children | d753ce6cf588 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package controllers import ( "context" "database/sql" "fmt" "log" "net/http" "time" "gemma.intevation.de/gemma/pkg/models" "gemma.intevation.de/gemma/pkg/octree" ) const WGS84 = 4326 func reproject( rp *models.Reprojector, src models.GeoJSONLineCoordinates, ctx context.Context, ) (models.GeoJSONLineCoordinates, error) { dst := make(models.GeoJSONLineCoordinates, len(src)) for i, s := range src { var err error if dst[i].Lat, dst[i].Lon, err = rp.Reproject( s.Lat, s.Lon, ctx, ); err != nil { return nil, err } } return dst, nil } const projectBackSQL = ` SELECT ST_AsBinary( ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))` func projectBack( line octree.MultiLineStringZ, epsg uint32, conn *sql.Conn, ctx context.Context, ) (models.GeoJSONMultiLineCoordinatesZ, error) { var mls models.GeoJSONMultiLineCoordinatesZ err := conn.QueryRowContext( ctx, projectBackSQL, epsg, line.AsWKB(), ).Scan(&mls) return mls, err } func crossSection( input interface{}, req *http.Request, conn *sql.Conn, ) (jr JSONResult, err error) { csi := input.(*models.CrossSectionInput) start := time.Now() tree, err := octree.Cache.Get( csi.Properties.Bottleneck, csi.Properties.Date.Time, conn, req.Context()) log.Printf("loading octree took: %s\n", time.Since(start)) if err != nil { return } if tree == nil { err = JSONError{ Code: http.StatusNotFound, Message: fmt.Sprintf("Cannot find survey for %s/%s.", csi.Properties.Bottleneck, csi.Properties.Date.Time), } return } // The coordinate system of the octree is an UTM projection. // The input coordinates are in WGS84. // So we need to reproject them. start = time.Now() var rp *models.Reprojector if rp, err = models.NewReprojector( conn, req.Context(), WGS84, tree.EPSG, ); err != nil { return } defer rp.Close() coords, err := reproject(rp, csi.Geometry.Coordinates, req.Context()) log.Printf("transforming input coords took: %s\n", time.Since(start)) if err != nil { return } start = time.Now() var segments octree.MultiLineStringZ for i := 0; i < len(coords)-1; i++ { c1 := &coords[i] c2 := &coords[i+1] verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon) var line octree.MultiLineStringZ tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) { if ls := verticalLine.Intersection(t); len(ls) > 0 { line = append(line, ls) } }) if len(line) > 0 { log.Printf("line length: %d\n", len(line)) // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon). // Sort them by project them on this line. joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon) log.Printf("joined length: %d\n", len(joined)) segments = append(segments, joined...) } } log.Printf("octree traversal took: %s\n", time.Since(start)) start = time.Now() var joined models.GeoJSONMultiLineCoordinatesZ joined, err = projectBack( segments, tree.EPSG, conn, req.Context(), ) log.Printf("projecting back took: %s\n", time.Since(start)) if err != nil { return } jr = JSONResult{ Result: &models.CrossSectionOutput{ Type: "Feature", Geometry: models.CrossSectionOutputGeometry{ Type: "MultiLineString", Coordinates: joined, }, Properties: map[string]interface{}{}, }, } return }