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annotate pkg/controllers/cross.go @ 1182:936dd3714325

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cross sections: As the triangles in the octree are already clipped against the area of the soundind result there is no need to clip the cross section result against this area.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 15 Nov 2018 15:50:02 +0100
parents a244b18cb916
children d753ce6cf588
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 controllers
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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 "fmt"
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20 "log"
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21 "net/http"
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22 "time"
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23
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24 "gemma.intevation.de/gemma/pkg/models"
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25 "gemma.intevation.de/gemma/pkg/octree"
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26 )
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27
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28 const WGS84 = 4326
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29
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30 func reproject(
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31 rp *models.Reprojector,
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32 src models.GeoJSONLineCoordinates,
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33 ctx context.Context,
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34 ) (models.GeoJSONLineCoordinates, error) {
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35
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36 dst := make(models.GeoJSONLineCoordinates, len(src))
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37 for i, s := range src {
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38 var err error
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39 if dst[i].Lat, dst[i].Lon, err = rp.Reproject(
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40 s.Lat, s.Lon, ctx,
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41 ); err != nil {
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42 return nil, err
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43 }
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44 }
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45 return dst, nil
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46 }
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47
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48 const projectBackSQL = `
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49 SELECT ST_AsBinary(
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50 ST_Transform(ST_GeomFromWKB($2, $1::integer), 4326))`
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51
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52 func projectBack(
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53 line octree.MultiLineStringZ,
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54 epsg uint32,
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55 conn *sql.Conn,
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56 ctx context.Context,
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57 ) (models.GeoJSONMultiLineCoordinatesZ, error) {
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58
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59 var mls models.GeoJSONMultiLineCoordinatesZ
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60 err := conn.QueryRowContext(
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61 ctx, projectBackSQL,
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62 epsg, line.AsWKB(),
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63 ).Scan(&mls)
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64
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65 return mls, err
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66 }
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67
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68 func crossSection(
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69 input interface{},
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70 req *http.Request,
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71 conn *sql.Conn,
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72 ) (jr JSONResult, err error) {
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73
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74 csi := input.(*models.CrossSectionInput)
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75
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76 start := time.Now()
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77
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78 tree, err := octree.Cache.Get(
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79 csi.Properties.Bottleneck, csi.Properties.Date.Time,
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80 conn, req.Context())
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81
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82 log.Printf("loading octree took: %s\n", time.Since(start))
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83 if err != nil {
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84 return
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85 }
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86
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87 if tree == nil {
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88 err = JSONError{
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89 Code: http.StatusNotFound,
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90 Message: fmt.Sprintf("Cannot find survey for %s/%s.",
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91 csi.Properties.Bottleneck,
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92 csi.Properties.Date.Time),
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93 }
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94 return
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95 }
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96
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97 // The coordinate system of the octree is an UTM projection.
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98 // The input coordinates are in WGS84.
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99 // So we need to reproject them.
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100
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101 start = time.Now()
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102
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103 var rp *models.Reprojector
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104 if rp, err = models.NewReprojector(
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105 conn, req.Context(),
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106 WGS84, tree.EPSG,
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107 ); err != nil {
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108 return
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109 }
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110 defer rp.Close()
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111
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112 coords, err := reproject(rp, csi.Geometry.Coordinates, req.Context())
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113
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114 log.Printf("transforming input coords took: %s\n", time.Since(start))
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115 if err != nil {
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116 return
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117 }
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118
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119 start = time.Now()
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120
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121 var segments octree.MultiLineStringZ
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122
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123 for i := 0; i < len(coords)-1; i++ {
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124 c1 := &coords[i]
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125 c2 := &coords[i+1]
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126
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127 verticalLine := octree.NewVerticalLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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128
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129 var line octree.MultiLineStringZ
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130 tree.Vertical(c1.Lat, c1.Lon, c2.Lat, c2.Lon, func(t *octree.Triangle) {
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131 if ls := verticalLine.Intersection(t); len(ls) > 0 {
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132 line = append(line, ls)
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133 }
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134 })
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135
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136 if len(line) > 0 {
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137 log.Printf("line length: %d\n", len(line))
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138 // They are all on the segment (c1.Lat, c1.Lon) - (c2.Lat, c2.Lon).
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139 // Sort them by project them on this line.
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140 joined := line.JoinOnLine(c1.Lat, c1.Lon, c2.Lat, c2.Lon)
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141 log.Printf("joined length: %d\n", len(joined))
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142 segments = append(segments, joined...)
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143 }
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144
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145 }
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146 log.Printf("octree traversal took: %s\n", time.Since(start))
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147
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148 start = time.Now()
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149
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150 var joined models.GeoJSONMultiLineCoordinatesZ
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151 joined, err = projectBack(
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152 segments, tree.EPSG,
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153 conn, req.Context(),
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154 )
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155
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156 log.Printf("projecting back took: %s\n", time.Since(start))
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157 if err != nil {
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158 return
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159 }
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160
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161 jr = JSONResult{
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162 Result: &models.CrossSectionOutput{
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163 Type: "Feature",
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164 Geometry: models.CrossSectionOutputGeometry{
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165 Type: "MultiLineString",
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166 Coordinates: joined,
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167 },
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168 Properties: map[string]interface{}{},
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169 },
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170 }
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parents:
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171
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parents:
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172 return
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173 }