Mercurial > gemma

annotate cmd/octree2contour/loader.go @ 726:5af9ab39e715

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Renamed a few types to uppercase names to prepare the move to the octree package.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 22 Sep 2018 21:34:12 +0200
parents 9db4ae29ded9
children
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120a82bd9953 octree: Added loading frame for contour generation.
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1 package main
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2
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3 import (
120a82bd9953 octree: Added loading frame for contour generation.
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4 "bufio"
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5 "encoding/binary"
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6 "log"
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7 "os"
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8
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9 "github.com/golang/snappy"
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10 )
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11
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5af9ab39e715 Renamed a few types to uppercase names to prepare the move to the octree package.
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12 func loadOctreeReader(r *bufio.Reader) (*Octree, error) {
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13 tree := new(Octree)
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14
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15 if err := binary.Read(r, binary.LittleEndian, &tree.EPSG); err != nil {
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16 return nil, err
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17 }
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18
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19 log.Printf("EPSG: %d\n", tree.EPSG)
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20
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21 if err := tree.Min.read(r); err != nil {
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22 return nil, err
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23 }
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24
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25 if err := tree.Max.read(r); err != nil {
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26 return nil, err
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27 }
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28
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29 log.Printf("BBOX: [[%f, %f, %f], [%f, %f, %f]]\n",
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30 tree.Min.x, tree.Min.y, tree.Min.z,
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31 tree.Max.x, tree.Max.y, tree.Max.z)
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32
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33 var numVertices uint32
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34 if err := binary.Read(r, binary.LittleEndian, &numVertices); err != nil {
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35 return nil, err
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36 }
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37
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38 log.Printf("vertices: %d\n", numVertices)
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39
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40 vertices := make([]Vertex, numVertices)
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41 tree.vertices = vertices
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42
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43 for i := range vertices {
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44 if err := vertices[i].read(r); err != nil {
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45 return nil, err
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46 }
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47 }
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48
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49 var numTriangles uint32
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50 if err := binary.Read(r, binary.LittleEndian, &numTriangles); err != nil {
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51 return nil, err
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52 }
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53
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54 log.Printf("triangles: %d\n", numTriangles)
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55
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56 indices := make([]int32, 3*numTriangles)
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57 triangles := make([][]int32, numTriangles)
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58 tree.triangles = triangles
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59
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60 var last int32
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61
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62 for i := range triangles {
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63 tri := indices[:3]
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64 indices = indices[3:]
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65 triangles[i] = tri
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66 for j := range tri {
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67 v, err := binary.ReadVarint(r)
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68 if err != nil {
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69 return nil, err
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70 }
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71 value := int32(v) + last
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72 tri[j] = value
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73 last = value
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74 }
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75 }
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76
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77 var numNodes uint32
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78 if err := binary.Read(r, binary.LittleEndian, &numNodes); err != nil {
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79 return nil, err
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80 }
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81
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82 log.Printf("num nodes: %d\n", numNodes)
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83
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84 tree.index = make([]int32, numNodes)
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85 entries := tree.index[1:]
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86
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87 last = 0
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88 for i := range entries {
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89 v, err := binary.ReadVarint(r)
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90 if err != nil {
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91 return nil, err
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92 }
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93 value := int32(v) + last
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94 entries[i] = value
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95 last = value
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96 }
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97
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98 return tree, nil
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99 }
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100
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101 func LoadOctree(fname string) (*Octree, error) {
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102
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103 f, err := os.Open(fname)
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104 if err != nil {
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105 return nil, err
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106 }
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107 defer f.Close()
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108 return loadOctreeReader(bufio.NewReader(snappy.NewReader(f)))
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109 }