64 lines
1.5 KiB
Go
64 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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type CoordSeq struct {
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v *C.GEOSCoordSequence
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}
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func (this *Geos) CreateCoordSeq(size, dim uint32) (*CoordSeq, error) {
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result := C.GEOSCoordSeq_create_r(this.v, C.uint(size), C.uint(dim))
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if result == nil {
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return nil, CreateError("could not create CoordSeq")
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}
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return &CoordSeq{result}, nil
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}
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func (this *CoordSeq) SetXY(handle *Geos, i uint32, x, y float64) error {
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if C.GEOSCoordSeq_setX_r(handle.v, this.v, C.uint(i), C.double(x)) == 0 {
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return Error("unable to SetY")
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}
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if C.GEOSCoordSeq_setY_r(handle.v, this.v, C.uint(i), C.double(y)) == 0 {
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return Error("unable to SetX")
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}
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return nil
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}
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func (this *CoordSeq) AsPoint(handle *Geos) (*Geom, error) {
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geom := C.GEOSGeom_createPoint_r(handle.v, this.v)
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if geom == nil {
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return nil, CreateError("unable to create Point")
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}
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return &Geom{geom}, nil
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}
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func (this *CoordSeq) AsLineString(handle *Geos) (*Geom, error) {
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geom := C.GEOSGeom_createLineString_r(handle.v, this.v)
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if geom == nil {
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return nil, CreateError("unable to create LineString")
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}
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return &Geom{geom}, nil
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}
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func (this *CoordSeq) AsLinearRing(handle *Geos) (*Geom, error) {
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ring := C.GEOSGeom_createLinearRing_r(handle.v, this.v)
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if ring == nil {
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return nil, CreateError("unable to create LinearRing")
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}
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return &Geom{ring}, nil
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}
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func (this *Geos) DestroyCoordSeq(coordSeq *CoordSeq) {
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if coordSeq.v != nil {
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C.GEOSCoordSeq_destroy_r(this.v, coordSeq.v)
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coordSeq.v = nil
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} else {
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panic("double free?")
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}
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}
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