func test() {
g1 := geos.Must(geos.FromWKT("LINESTRING(0 0, 3 3, 3 2, 4 2, 7 5)"))
g2 := geos.Must(geos.FromWKT("LINESTRING(0 10, 1 0, 0 10, 10 10)"))
g3 := geos.Must(geos.FromWKT("POINT(5 5)"))
g4 := geos.Must(g3.Buffer(1))
g5 := geos.Must(geos.FromWKT("MULTIPOINT(5 6, 6 6, 3 8, 7 8)"))
example("test.png", g1, g2, g4, g3, g5)
}
func ex9() {
wkt := []string{
"LINESTRING (2 10, 3 10, 4 9, 5 8)",
"LINESTRING (5 8, 6 6, 6 5)",
"LINESTRING (6 5, 9 6, 10 7, 11 9)",
"LINESTRING (11 9, 11 10, 10 11)",
"LINESTRING (6 5, 3 4, 2 3)",
"LINESTRING (2 3, 1.5 2.5, 1 1, 1 0)",
"LINESTRING (1 0, 0 0, 0 -1, 1 -2)",
"LINESTRING (1 -2, 2 -2, 3 -1, 3 0, 1 0)",
"LINESTRING (6 5, 6 3, 6.5 2.5)",
"LINESTRING (6.5 2.5, 7.5 2, 8.5 1.5)",
"LINESTRING (8.5 1.5, 9 0.5, 10 0.5, 11 1.5)",
}
var linestrings []*geos.Geometry
for i := range wkt {
linestrings = append(linestrings, geos.Must(geos.FromWKT(wkt[i])))
}
example("example9-unmerged-linestrings.png", linestrings...)
merged := geos.Must(geos.Must(geos.NewCollection(geos.MULTILINESTRING, linestrings...)).LineMerge())
example("example9-merged-linestrings.png", merged)
}
func ExampleGeometry_LineInterpolatePoint() {
line := geos.Must(geos.FromWKT("LINESTRING(25 50, 100 125, 150 190)"))
pt := geos.Must(line.LineInterpolatePoint(0.20))
fmt.Println(pt)
// Output: POINT (51.5974135047432014 76.5974135047432014)
}
func main() {
line, _ := geos.FromWKT("LINESTRING (0 0, 10 10, 20 20)")
buf, _ := line.Buffer(2.5)
fmt.Printf("Hello, world. Sqrt(2) = %v%v\n", newmath.Sqrt(2), buf)
}
func main() {
flag.Parse()
poly := geos.Must(geos.FromWKT(*aoi))
bbox, err := geosconverter.GetBoundingBox(poly)
if err != nil {
log.Fatal(err)
}
//Source
if len(*srcDriver) == 0 {
*srcDriver = raster.FindDriverName(*src)
}
input, err := raster.Open(*srcDriver, *src)
if err != nil {
log.Fatal(err)
}
if c, ok := input.(closer); ok {
defer c.Close()
}
var inputReader raster.TileReader
if len(*srcLayer) > 0 {
inputReader, err = input.OpenTileLayer(*srcLayer)
} else {
inputReader, err = raster.OpenTileLayerAt(input, 0)
}
if err != nil {
log.Fatal(err)
}
//Destination
if len(*dstDriver) == 0 {
*dstDriver = raster.FindDriverName(*dst)
}
outputReader, err := raster.Open(*dstDriver, *dst)
if err != nil {
log.Fatal(err)
}
output, ok := outputReader.(raster.WritableTileSource)
if !ok {
log.Fatal("Output driver does not allow writing")
}
if c, ok := output.(closer); ok {
defer c.Close()
}
outputWriter, err := output.CreateTileLayer(*dstLayer)
if err != nil {
log.Fatal(err)
}
//Initialize the copy
copier, err := raster.NewCopier(inputReader, outputWriter)
if err != nil {
log.Fatal(err)
}
polygonFilter := geosconverter.IntersectsFilter(poly)
if *replace {
copier.Filter = polygonFilter
} else {
copier.Filter = raster.Any(outputWriter.Contains, polygonFilter)
}
//Iterate on each requested level and performs the copy
for level := *lvlmin; level <= *lvlmax; level++ {
log.Print("Level: ", level)
if *replace {
log.Print("Level ", level, " clearing in database")
err := outputWriter.Clear(level)
if err != nil {
log.Fatal(err)
}
log.Print("Level ", level, " cleared in database")
}
tiles, err := raster.GetTileBlock(bbox, level)
if err != nil {
log.Fatal(err)
}
log.Print("BBOX (tiles): ", tiles)
log.Print("Nb tiles in BBOX: ", tiles.Count())
bar := pb.StartNew(tiles.Count())
processed, err := copier.CopyBlock(tiles, func(level, x, y int, processed bool) {
bar.Increment()
})
if err != nil {
log.Fatal(err)
}
bar.FinishPrint("End")
log.Print("Nb tiles processed: ", processed)
}
}
func ex8() {
l := geos.Must(geos.FromWKT("LINESTRING (0 2, 6 2, 3 4, 4.5 8, 1 8, 3 0)"))
b := geos.Must(l.Buffer(0.5))
example("example8-buffer.png", b, l)
}
func ex2() {
a := geos.Must(geos.FromWKT("LINEARRING (0 3, 2 3, 3 1, 1 0, 0 1.5, 0 3)"))
b := geos.Must(geos.FromWKT("LINEARRING (1 2, 1.5 4, 3.5 4, 4.5 2.5, 1 2)"))
example("example2-a-b.png", a, b)
}
func ex1() {
example("example1.png", geos.Must(geos.FromWKT("LINESTRING (0 0, 10 10, 20 20)")))
}
func ex10() {
l := geos.Must(geos.FromWKT("LINESTRING (0 2, 6 2, 3 4, 4.5 8, 1 8, 3 0)"))
b := geos.Must(l.ConvexHull())
example("example10-convex-hull.png", b, l)
}
ex3()
ex4()
ex5()
ex6()
ex7()
ex8()
ex9()
ex10()
}
func ex1() {
example("example1.png", geos.Must(geos.FromWKT("LINESTRING (0 0, 10 10, 20 20)")))
}
var (
a = geos.Must(geos.FromWKT("POLYGON ((0 3, 2 3, 3 1, 1 0, 0 1.5, 0 3))"))
b = geos.Must(geos.FromWKT("POLYGON ((1 2, 1.5 4, 3.5 4, 4.5 2.5, 1 2))"))
)
func ex2() {
a := geos.Must(geos.FromWKT("LINEARRING (0 3, 2 3, 3 1, 1 0, 0 1.5, 0 3)"))
b := geos.Must(geos.FromWKT("LINEARRING (1 2, 1.5 4, 3.5 4, 4.5 2.5, 1 2)"))
example("example2-a-b.png", a, b)
}
func ex3() {
example("example3-intersection.png", a, b, geos.Must(a.Intersection(b)))
}
func ex4() {
example("example4-union.png", a, b, geos.Must(a.Union(b)))
// Loads a CSV file from https://github.com/delight-im/FreeGeoDB
// The expected CSV columns are:
// 0 : id
// 1 : coordinates_wkt
// 2 : sovereign
// 3 : name
// 4 : formal
// 5 : economy_level
// 6 : income_level
// 7 : iso_alpha2
// 8 : iso_alpha3
// 9 : iso_numeric3
// 10 : continent
// 11 : subregion
func load_freegeodb_countries_csv(rt *rtreego.Rtree, fname string) (int, error) {
log.Println("Loading", fname, "...")
f, err := os.Open(fname)
if err != nil {
return 0, err
}
defer f.Close()
df, err := Decompressor(f)
if err != nil {
return 0, err
}
r := csv.NewReader(df)
r.Comma = ','
_, err = r.Read() // Don't read header
if err != nil {
return 0, err
}
line := 0
loaded_objects := 0
for {
cols, err := r.Read()
if err == io.EOF {
break
} else if err != nil {
return loaded_objects, err
}
line++
if len(cols) != 12 {
return loaded_objects, fmt.Errorf("Invalid column format in", fname, cols)
}
if len(cols[7]) != 2 || len(cols[8]) != 3 || len(cols[3]) == 0 {
continue
}
geodb_id, err := strconv.ParseInt(cols[0], 10, 64)
if err != nil {
log.Fatal("Error parsing", cols, line, err)
}
geom, err := geos.FromWKT(cols[1])
if err != nil {
log.Fatal("Error parsing", cols, line, err)
}
rect, err := RtreeBboxg(geom, 1e-5)
if err != nil {
log.Fatal("Error getting bbox", cols, line, err)
}
obj := GeoObj{rect,
&GeoData{
Id: geodb_id,
CountryName: cols[3],
CountryCode_2: cols[7],
CountryCode_3: cols[8],
Type: "country",
Geom: geom}}
rt.Insert(&obj)
loaded_objects++
}
return loaded_objects, nil
}