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Implemented ST_Buffer. Had to write our own parsing logic to make it compatible with C. Also ran clang-format and fixed up a few bad infos. Release note (sql change): Implement ST_Buffer for geometry and string variants.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // Copyright 2020 The Cockroach Authors. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the file licenses/BSL.txt. | ||
| // | ||
| // As of the Change Date specified in that file, in accordance with | ||
| // the Business Source License, use of this software will be governed | ||
| // by the Apache License, Version 2.0, included in the file | ||
| // licenses/APL.txt. | ||
|
|
||
| package geomfn | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/cockroachdb/cockroach/pkg/geo" | ||
| "github.com/cockroachdb/cockroach/pkg/geo/geos" | ||
| "github.com/cockroachdb/errors" | ||
| ) | ||
|
|
||
| // BufferParams is a wrapper around the geos.BufferParams. | ||
| type BufferParams struct { | ||
| p geos.BufferParams | ||
| } | ||
|
|
||
| // MakeDefaultBufferParams returns the default BufferParams/ | ||
| func MakeDefaultBufferParams() BufferParams { | ||
| return BufferParams{ | ||
| p: geos.BufferParams{ | ||
| EndCapStyle: geos.BufferParamsEndCapStyleRound, | ||
| JoinStyle: geos.BufferParamsJoinStyleRound, | ||
| SingleSided: false, | ||
| QuadrantSegments: 8, | ||
| MitreLimit: 5.0, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // WithQuadrantSegments returns a copy of the BufferParams with the quadrantSegments set. | ||
| func (b BufferParams) WithQuadrantSegments(quadrantSegments int) BufferParams { | ||
| ret := b | ||
| ret.p.QuadrantSegments = quadrantSegments | ||
| return ret | ||
| } | ||
|
|
||
| // ParseBufferParams parses the given buffer params from a SQL string into | ||
| // the BufferParams form. | ||
| // The string must be of the same format as specified by https://postgis.net/docs/ST_Buffer.html. | ||
| // Returns the BufferParams, as well as the modified distance. | ||
| func ParseBufferParams(s string, distance float64) (BufferParams, float64, error) { | ||
| p := MakeDefaultBufferParams() | ||
| fields := strings.Fields(s) | ||
| for _, field := range fields { | ||
| fParams := strings.Split(field, "=") | ||
| if len(fParams) != 2 { | ||
| return BufferParams{}, 0, errors.Newf("unknown buffer parameter: %s", fParams) | ||
| } | ||
| f, val := fParams[0], fParams[1] | ||
| switch strings.ToLower(f) { | ||
| case "quad_segs": | ||
| valInt, err := strconv.ParseInt(val, 10, 64) | ||
| if err != nil { | ||
| return BufferParams{}, 0, errors.Wrapf(err, "invalid int for %s: %s", f, val) | ||
| } | ||
| p.p.QuadrantSegments = int(valInt) | ||
| case "endcap": | ||
| switch strings.ToLower(val) { | ||
| case "round": | ||
| p.p.EndCapStyle = geos.BufferParamsEndCapStyleRound | ||
| case "flat", "butt": | ||
| p.p.EndCapStyle = geos.BufferParamsEndCapStyleFlat | ||
| case "square": | ||
| p.p.EndCapStyle = geos.BufferParamsEndCapStyleSquare | ||
| default: | ||
| return BufferParams{}, 0, errors.Newf("unknown endcap: %s (accepted: round, flat, square)", val) | ||
| } | ||
| case "join": | ||
| switch strings.ToLower(val) { | ||
| case "round": | ||
| p.p.JoinStyle = geos.BufferParamsJoinStyleRound | ||
| case "mitre", "miter": | ||
| p.p.JoinStyle = geos.BufferParamsJoinStyleMitre | ||
| case "bevel": | ||
| p.p.JoinStyle = geos.BufferParamsJoinStyleBevel | ||
| default: | ||
| return BufferParams{}, 0, errors.Newf("unknown join: %s (accepted: round, mitre, bevel)", val) | ||
| } | ||
| case "mitre_limit", "miter_limit": | ||
| valFloat, err := strconv.ParseFloat(val, 64) | ||
| if err != nil { | ||
| return BufferParams{}, 0, errors.Wrapf(err, "invalid float for %s: %s", f, val) | ||
| } | ||
| p.p.MitreLimit = valFloat | ||
| case "side": | ||
| switch strings.ToLower(val) { | ||
| case "both": | ||
| p.p.SingleSided = false | ||
| case "left": | ||
| p.p.SingleSided = true | ||
| case "right": | ||
| p.p.SingleSided = true | ||
| distance *= -1 | ||
| default: | ||
| return BufferParams{}, 0, errors.Newf("unknown side: %s (accepted: both, left, right)", val) | ||
| } | ||
| default: | ||
| return BufferParams{}, 0, errors.Newf("unknown field: %s (accepted fields: quad_segs, endcap, join, mitre_limit, side)", f) | ||
| } | ||
| } | ||
| return p, distance, nil | ||
| } | ||
|
|
||
| // Buffer buffers a given Geometry by the supplied parameters. | ||
| func Buffer(g *geo.Geometry, params BufferParams, distance float64) (*geo.Geometry, error) { | ||
| bufferedGeom, err := geos.Buffer(g.EWKB(), params.p, distance) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return geo.ParseGeometryFromEWKB(bufferedGeom) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // Copyright 2020 The Cockroach Authors. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the file licenses/BSL.txt. | ||
| // | ||
| // As of the Change Date specified in that file, in accordance with | ||
| // the Business Source License, use of this software will be governed | ||
| // by the Apache License, Version 2.0, included in the file | ||
| // licenses/APL.txt. | ||
|
|
||
| package geomfn | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/cockroachdb/cockroach/pkg/geo/geos" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestParseBufferParams(t *testing.T) { | ||
| testCases := []struct { | ||
| s string | ||
| d float64 | ||
|
|
||
| expected BufferParams | ||
| expectedD float64 | ||
| }{ | ||
| { | ||
| s: "", | ||
| d: 100, | ||
| expected: BufferParams{p: geos.BufferParams{ | ||
| EndCapStyle: geos.BufferParamsEndCapStyleRound, | ||
| JoinStyle: geos.BufferParamsJoinStyleRound, | ||
| SingleSided: false, | ||
| QuadrantSegments: 8, | ||
| MitreLimit: 5.0, | ||
| }}, | ||
| expectedD: 100, | ||
| }, | ||
| { | ||
| s: "endcap=flat join=mitre quad_segs=4", | ||
| d: 100, | ||
| expected: BufferParams{p: geos.BufferParams{ | ||
| EndCapStyle: geos.BufferParamsEndCapStyleFlat, | ||
| JoinStyle: geos.BufferParamsJoinStyleMitre, | ||
| SingleSided: false, | ||
| QuadrantSegments: 4, | ||
| MitreLimit: 5.0, | ||
| }}, | ||
| expectedD: 100, | ||
| }, | ||
| { | ||
| s: "side=left", | ||
| d: 100, | ||
| expected: BufferParams{p: geos.BufferParams{ | ||
| EndCapStyle: geos.BufferParamsEndCapStyleRound, | ||
| JoinStyle: geos.BufferParamsJoinStyleRound, | ||
| SingleSided: true, | ||
| QuadrantSegments: 8, | ||
| MitreLimit: 5.0, | ||
| }}, | ||
| expectedD: 100, | ||
| }, | ||
| { | ||
| s: "side=right", | ||
| d: 100, | ||
| expected: BufferParams{p: geos.BufferParams{ | ||
| EndCapStyle: geos.BufferParamsEndCapStyleRound, | ||
| JoinStyle: geos.BufferParamsJoinStyleRound, | ||
| SingleSided: true, | ||
| QuadrantSegments: 8, | ||
| MitreLimit: 5.0, | ||
| }}, | ||
| expectedD: -100, | ||
| }, | ||
| } | ||
|
|
||
| for _, tc := range testCases { | ||
| t.Run(tc.s, func(t *testing.T) { | ||
| s, d, err := ParseBufferParams(tc.s, tc.d) | ||
| require.NoError(t, err) | ||
| require.Equal(t, tc.expected, s) | ||
| require.Equal(t, tc.expectedD, d) | ||
| }) | ||
| } | ||
| } |
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