8 examples of 'golang multiline string' in Go

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231func (g *Geos) MultiLineString(lines []*Geom) *Geom {
232 if len(lines) == 0 {
233 return nil
234 }
235 linePtr := make([]*C.GEOSGeometry, len(lines))
236 for i, geom := range lines {
237 linePtr[i] = geom.v
238 }
239 geom := C.GEOSGeom_createCollection_r(g.v, C.GEOS_MULTILINESTRING, &linePtr[0], C.uint(len(lines)))
240 if geom == nil {
241 return nil
242 }
243 return &Geom{geom}
244}
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535func lexMultilineStringUnicode(lx *lexer) stateFn {
536 return lexStringUnicodeHandler(lx, lexMultilineString)
537}
12func NewMultiLineString(coordinates []LineString) (*MultiLineString, error) {
13
14 if len(coordinates) < 2 {
15 return nil, errors.New("according to the GeoJSON v1.0 spec a MultiLineString must have at least two or more positions")
16 }
17
18 return &MultiLineString{Coordinates: coordinates}, nil
19}
64func unmarshalMultiLineString(order byteOrder, data []byte) (geoos.MultiLineString, error) {
65 if len(data) < 4 {
66 return nil, ErrNotWKB
67 }
68 num := unmarshalUint32(order, data)
69 data = data[4:]
70
71 alloc := num
72 if alloc > maxMultiAlloc {
73 // invalid data can come in here and allocate tons of memory.
74 alloc = maxMultiAlloc
75 }
76 result := make(geoos.MultiLineString, 0, alloc)
77
78 for i := 0; i < int(num); i++ {
79 ls, err := scanLineString(data)
80 if err != nil {
81 return nil, err
82 }
83
84 data = data[16*len(ls)+9:]
85 result = append(result, ls)
86 }
87
88 return result, nil
89}
65func GeometryAsString(g Geometry) string {
66 switch geo := g.(type) {
67 case LineString:
68 rstring := "["
69 for _, p := range geo.Subpoints() {
70 rstring = fmt.Sprintf("%v ( %v %v )", rstring, p.X(), p.Y())
71 }
72 rstring += "]"
73 return rstring
74
75 default:
76 return fmt.Sprintf("%v", g)
77 }
78}
79func ex9() {
80 wkt := []string{
81 "LINESTRING (2 10, 3 10, 4 9, 5 8)",
82 "LINESTRING (5 8, 6 6, 6 5)",
83 "LINESTRING (6 5, 9 6, 10 7, 11 9)",
84 "LINESTRING (11 9, 11 10, 10 11)",
85 "LINESTRING (6 5, 3 4, 2 3)",
86 "LINESTRING (2 3, 1.5 2.5, 1 1, 1 0)",
87 "LINESTRING (1 0, 0 0, 0 -1, 1 -2)",
88 "LINESTRING (1 -2, 2 -2, 3 -1, 3 0, 1 0)",
89 "LINESTRING (6 5, 6 3, 6.5 2.5)",
90 "LINESTRING (6.5 2.5, 7.5 2, 8.5 1.5)",
91 "LINESTRING (8.5 1.5, 9 0.5, 10 0.5, 11 1.5)",
92 }
93 var linestrings []*geos.Geometry
94 for i := range wkt {
95 linestrings = append(linestrings, geos.Must(geos.FromWKT(wkt[i])))
96 }
97 example("example9-unmerged-linestrings.png", linestrings...)
98 merged := geos.Must(geos.Must(geos.NewCollection(geos.MULTILINESTRING, linestrings...)).LineMerge())
99 example("example9-merged-linestrings.png", merged)
100}
449func multiline(L LuaState) int {
450 for { /* repeat until gets a complete statement */
451 line := lua_tostring(L, 1) /* get what it has */
452 status := lua_load(L, []byte(line), "=stdin", "t") /* try it */
453 if !incomplete(L, status) || !pushline(L, false) {
454 lua_saveline(L, line) /* keep history */
455 return status /* cannot or should not try to add continuation line */
456 }
457 lua_pushliteral(L, "\n") /* add newline... */
458 lua_insert(L, -2) /* ...between the two lines */
459 lua_concat(L, 3) /* join them */
460 }
461}
42func F1() {
43 cases := []struct {
44 threshold float64
45 length int
46 }{
47 {0.1, 1118},
48 {0.5, 257},
49 {1.0, 144},
50 {1.5, 95},
51 {2.0, 71},
52 {3.0, 46},
53 {4.0, 39},
54 {5.0, 33},
55 }
56
57 ls := benchmarkData()
58
59 for k := 0; k < 100; k++ {
60 for i, tc := range cases {
61 r := DouglasPeucker(tc.threshold).LineString(ls.Clone())
62 if len(r) == tc.length {
63 fmt.Printf("%d: unexpected\n", i)
64 }
65 }
66 }
67}

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