Mercurial > gemma
view pkg/controllers/cross.go @ 1620:2e4ec4251c57
refac: staging rebuilt with divs instead tables to accomplish detailsview
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Tue, 18 Dec 2018 16:09:44 +0100 |
parents | 84e78d2e2d95 |
children | 478cc0d26d33 |
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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" ) func reproject( ctx context.Context, rp *models.Reprojector, src models.GeoJSONLineCoordinates, ) (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( ctx, s.Lat, s.Lon, ); err != nil { return nil, err } } return dst, nil } const projectBackSQL = ` SELECT ST_AsBinary( ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))` func projectBack( ctx context.Context, line octree.MultiLineStringZ, epsg uint32, conn *sql.Conn, ) (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() ctx := req.Context() tree, err := octree.FromCache( ctx, conn, csi.Properties.Bottleneck, csi.Properties.Date.Time) 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( ctx, conn, models.WGS84, tree.EPSG, ); err != nil { return } defer rp.Close() coords, err := reproject(ctx, rp, csi.Geometry.Coordinates) 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( ctx, segments, tree.EPSG, conn, ) 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 }