82 lines
1.5 KiB
Go
82 lines
1.5 KiB
Go
package geos
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/*
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#cgo LDFLAGS: -lgeos_c
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#include "geos_c.h"
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#include <stdlib.h>
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*/
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import "C"
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import (
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"unsafe"
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)
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func (this *Geos) FromWkt(wkt string) *Geom {
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wktC := C.CString(wkt)
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defer C.free(unsafe.Pointer(wktC))
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geom := C.GEOSGeomFromWKT_r(this.v, wktC)
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if geom == nil {
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return nil
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}
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return &Geom{geom}
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}
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func (this *Geos) FromWkb(wkb []byte) *Geom {
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if len(wkb) == 0 {
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return nil
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}
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geom := C.GEOSGeomFromWKB_buf_r(this.v, (*C.uchar)(&wkb[0]), C.size_t(len(wkb)))
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if geom == nil {
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return nil
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}
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return &Geom{geom}
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}
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func (this *Geos) AsWkt(geom *Geom) string {
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str := C.GEOSGeomToWKT_r(this.v, geom.v)
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if str == nil {
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return ""
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}
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result := C.GoString(str)
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C.free(unsafe.Pointer(str))
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return result
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}
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func (this *Geos) AsWkb(geom *Geom) []byte {
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var size C.size_t
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buf := C.GEOSGeomToWKB_buf_r(this.v, geom.v, &size)
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if buf == nil {
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return nil
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}
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result := C.GoBytes(unsafe.Pointer(buf), C.int(size))
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C.free(unsafe.Pointer(buf))
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return result
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}
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func (this *Geos) AsEwkbHex(geom *Geom) []byte {
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if this.wkbwriter == nil {
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this.wkbwriter = C.GEOSWKBWriter_create_r(this.v)
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if this.wkbwriter == nil {
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return nil
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}
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if this.srid != 0 {
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C.GEOSWKBWriter_setIncludeSRID_r(this.v, this.wkbwriter, C.char(1))
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}
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}
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if this.srid != 0 {
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C.GEOSSetSRID_r(this.v, geom.v, C.int(this.srid))
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}
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var size C.size_t
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buf := C.GEOSWKBWriter_writeHEX_r(this.v, this.wkbwriter, geom.v, &size)
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if buf == nil {
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return nil
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}
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result := C.GoBytes(unsafe.Pointer(buf), C.int(size))
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C.free(unsafe.Pointer(buf))
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return result
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}
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