65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package geom
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import (
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"gogeos"
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"goposm/element"
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)
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func PointWKB(geos *gogeos.GEOS, node element.Node) ([]byte, error) {
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coordSeq, err := geos.CreateCoordSeq(1, 2)
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if err != nil {
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return nil, err
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}
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// coordSeq inherited by LineString
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coordSeq.SetXY(geos, 0, nd.Long, nd.Lat)
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geom, err := coordSeq.AsPoint(geos)
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if err != nil {
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return nil, err
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}
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defer geos.Destroy(geom)
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return geos.AsWKB(geom)
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}
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func LineStringWKB(geos *gogeos.GEOS, nodes []element.Node) ([]byte, error) {
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coordSeq, err := geos.CreateCoordSeq(uint32(len(nodes)), 2)
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if err != nil {
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return nil, err
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}
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// coordSeq inherited by LineString
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for i, nd := range nodes {
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coordSeq.SetXY(geos, uint32(i), nd.Long, nd.Lat)
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}
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geom, err := coordSeq.AsLineString(geos)
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if err != nil {
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return nil, err
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}
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defer geos.Destroy(geom)
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return geos.AsWKB(geom)
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}
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func PolygonWKB(geos *gogeos.GEOS, nodes []element.Node) ([]byte, error) {
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coordSeq, err := geos.CreateCoordSeq(uint32(len(nodes)), 2)
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if err != nil {
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return nil, err
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}
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// coordSeq inherited by LineString, no destroy
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for i, nd := range nodes {
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err := coordSeq.SetXY(geos, uint32(i), nd.Long, nd.Lat)
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if err != nil {
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return nil, err
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}
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}
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geom, err := coordSeq.AsLinearRing(geos)
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if err != nil {
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return nil, err
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}
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// geom inherited by Polygon, no destroy
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geom = geos.CreatePolygon(geom, nil)
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if err != nil {
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return nil, err
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}
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defer geos.Destroy(geom)
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return geos.AsWKB(geom)
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}
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