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annotate pkg/controllers/cross.go @ 801:b6a1779ffb42

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Removed old cross section controller.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 27 Sep 2018 13:18:50 +0200
parents pkg/controllers/octreecross.go@0cc97135717c
children e10a8a682297
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package controllers
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2
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3 import (
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4 "context"
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5 "database/sql"
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6 "log"
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7 "net/http"
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8 "time"
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9
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10 "gemma.intevation.de/gemma/pkg/models"
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11 "gemma.intevation.de/gemma/pkg/octree"
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12 )
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13
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14 const WGS84 = 4326
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15
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16 func reproject(
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17 rp *models.Reprojector,
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18 src models.GeoJSONLineCoordinates,
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19 ctx context.Context,
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20 ) (models.GeoJSONLineCoordinates, error) {
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21
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22 dst := make(models.GeoJSONLineCoordinates, len(src))
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23 for i, s := range src {
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24 var err error
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25 if dst[i].Lat, dst[i].Lon, err = rp.Reproject(
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26 s.Lat, s.Lon, ctx,
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27 ); err != nil {
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28 return nil, err
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29 }
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30 }
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31 return dst, nil
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32 }
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33
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34 func projectBack(
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35 rp *models.Reprojector,
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36 lines octree.MultiLineStringZ,
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37 ctx context.Context,
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38 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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39
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40 out := make(models.GeoJSONMultiLineCoordinatesZ, len(lines))
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41
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42 for i, segment := range lines {
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43
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44 coords := make(models.GeoJSONLineCoordinatesZ, len(segment))
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45 out[i] = coords
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46 for j, v := range segment {
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47 lat, lon, err := rp.Reproject(v.X, v.Y, ctx)
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48 if err != nil {
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49 return nil, err
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50 }
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51 coords[j] = models.GeoJSONCoordinateZ{Lat: lat, Lon: lon, Z: v.Z}
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52 }
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53 }
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54 return out, nil
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55 }
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56
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57 func crossSection(
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58 input interface{},
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59 req *http.Request,
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60 conn *sql.Conn,
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61 ) (jr JSONResult, err error) {
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62
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63 csi := input.(*models.CrossSectionInput)
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64
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65 start := time.Now()
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66
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67 tree, err := octree.Cache.Get(
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68 csi.Properties.Bottleneck, csi.Properties.Date.Time,
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69 conn, req.Context())
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70
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71 log.Printf("loading octree took: %s\n", time.Since(start))
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72 if err != nil {
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73 return
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74 }
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75
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76 // The coordinate system of the octree is an UTM projection.
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77 // The input coordinates are in WGS84.
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78 // So we need to reproject them.
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79
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80 start = time.Now()
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81
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82 var rp *models.Reprojector
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83 if rp, err = models.NewReprojector(
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84 conn, req.Context(),
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85 WGS84, tree.EPSG,
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86 ); err != nil {
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87 return
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88 }
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89 defer rp.Close()
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90
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91 coords, err := reproject(rp, csi.Geometry.Coordinates, req.Context())
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92
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93 log.Printf("transforming input coords took: %s\n", time.Since(start))
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94 if err != nil {
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95 return
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96 }
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97
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98 start = time.Now()
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99
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100 var segments octree.MultiLineStringZ
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101
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102 for i := 0; i < len(coords)-1; i++ {
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103 c1 := &coords[i]
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104 c2 := &coords[i+1]
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105
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106 verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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107
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108 var line octree.MultiLineStringZ
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109 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) {
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110 if ls := verticalLine.Intersection(t); len(ls) > 0 {
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111 line = append(line, ls)
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112 }
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113 })
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114
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115 if len(line) > 0 {
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116 log.Printf("line length: %d\n", len(line))
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117 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon).
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118 // Sort them by project them on this line.
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 787
diff changeset
119 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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parents: 787
diff changeset
120 log.Printf("joined length: %d\n", len(joined))
0cc97135717c More fixes to vertical triangle intersection.
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parents: 787
diff changeset
121 segments = append(segments, joined...)
763
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
122 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
123
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
124 }
d05bc3e34338 More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
125 log.Printf("octree traversal took: %s\n", time.Since(start))
766
afc635ab9f5b Project the result data of the cross sections which are calculated in UTM back to WGS84.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 763
diff changeset
126
afc635ab9f5b Project the result data of the cross sections which are calculated in UTM back to WGS84.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 763
diff changeset
127 // The result have to be WGS84. So project the result back.
763
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
128 start = time.Now()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
129
766
afc635ab9f5b Project the result data of the cross sections which are calculated in UTM back to WGS84.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 763
diff changeset
130 rp.FromEPSG, rp.ToEPSG = tree.EPSG, WGS84
afc635ab9f5b Project the result data of the cross sections which are calculated in UTM back to WGS84.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 763
diff changeset
131
763
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
132 var joined models.GeoJSONMultiLineCoordinatesZ
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
133 joined, err = projectBack(rp, segments, req.Context())
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
134
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
135 log.Printf("projecting back took: %s\n", time.Since(start))
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
136 if err != nil {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
137 return
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
138 }
d05bc3e34338 More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
139
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
140 jr = JSONResult{
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
141 Result: &models.CrossSectionOutput{
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
142 Type: "Feature",
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
143 Geometry: models.CrossSectionOutputGeometry{
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
144 Type: "MultiLineString",
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
145 Coordinates: joined,
d05bc3e34338 More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
146 },
d05bc3e34338 More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
147 Properties: map[string]interface{}{},
d05bc3e34338 More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 762
diff changeset
148 },
753
e6f8d58434f4 Added stub for octree based cross sections.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 }
e6f8d58434f4 Added stub for octree based cross sections.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150
e6f8d58434f4 Added stub for octree based cross sections.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 return
e6f8d58434f4 Added stub for octree based cross sections.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 }