simplify

package
v1.1.3 Latest Latest
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 Go to latest Published: Aug 30, 2022 License: LGPL-2.1 Imports: 9 Imported by: 0

Documentation

Overview

Package simplify define Douglas Peucker and Topology Preserving simplify.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func HasInteriorIntersection 

func HasInteriorIntersection(seg0, seg1 *matrix.LineSegment) bool

HasInteriorIntersection ..

func IsInLineSection 

func IsInLineSection(
	line *TaggedLineString,
	sectionIndex []int,
	seg *matrix.LineSegment) bool

IsInLineSection Tests whether a segment is in a section of a TaggedLineString

func Simplify 

func Simplify(geom matrix.Steric, distanceTolerance float64) matrix.Steric

Simplify Simplifies a geometry using a given tolerance.

Types

type DPTransformer 

type DPTransformer struct {
	*Transformer
	// contains filtered or unexported fields
}

DPTransformer ...

func (*DPTransformer) Transform 

func (d *DPTransformer) Transform(inputGeom matrix.Steric) (matrix.Steric, error)

Transform ...

type DouglasPeuckerLineSimplifier 

type DouglasPeuckerLineSimplifier struct {
	// contains filtered or unexported fields
}

DouglasPeuckerLineSimplifier Simplifies a linestring (sequence of points) using the standard Douglas-Peucker algorithm.

func (*DouglasPeuckerLineSimplifier) Simplify 

func (d *DouglasPeuckerLineSimplifier) Simplify() []matrix.Matrix

Simplify Simplifies a linestring (sequence of points) using the standard Douglas-Peucker algorithm.

type DouglasPeuckerSimplifier 

type DouglasPeuckerSimplifier struct {
	// contains filtered or unexported fields
}

DouglasPeuckerSimplifier Simplifies a Geometry using the Douglas-Peucker algorithm. 

Ensures that any polygonal geometries returned are valid.
Simple lines are not guaranteed to remain simple after simplification.
All geometry types are handled.
Empty and point geometries are returned unchanged.
Empty geometry components are deleted.

type LineSegmentIndex 

type LineSegmentIndex struct {
	// contains filtered or unexported fields
}

LineSegmentIndex An spatial index on a set of LineSegments. Supports adding and removing items.

func (*LineSegmentIndex) Add 

func (l *LineSegmentIndex) Add(line matrix.LineMatrix)

Add add a LineMatrix.

func (*LineSegmentIndex) AddSegment 

func (l *LineSegmentIndex) AddSegment(seg *matrix.LineSegment)

AddSegment add a LineSegment.

func (*LineSegmentIndex) Query 

func (l *LineSegmentIndex) Query(querySeg *matrix.LineSegment) []*matrix.LineSegment

Query query LineSegment returns array TaggedLineSegment.

func (*LineSegmentIndex) Remove 

func (l *LineSegmentIndex) Remove(seg *TaggedLineSegment)

Remove remove a TaggedLineSegment.

type LineStringMapBuilderFilter 

type LineStringMapBuilderFilter struct {
	// contains filtered or unexported fields
}

LineStringMapBuilderFilter A filter to add linear geometries to the linestring map 

with the appropriate minimum size constraint.
For all other linestrings, the minimum size is 2 points.

func (*LineStringMapBuilderFilter) Clear added in v1.0.2 

func (l *LineStringMapBuilderFilter) Clear()

Clear clear Matrixes.

func (*LineStringMapBuilderFilter) Filter added in v1.0.2 

func (l *LineStringMapBuilderFilter) Filter(geom matrix.Matrix)

Filter linear geometries.

func (*LineStringMapBuilderFilter) FilterMatrixes added in v1.0.2 

func (l *LineStringMapBuilderFilter) FilterMatrixes(matrixes []matrix.Matrix)

FilterMatrixes Performs an operation with the provided .

func (*LineStringMapBuilderFilter) IsChanged added in v1.0.2 

func (l *LineStringMapBuilderFilter) IsChanged() bool

IsChanged Returns the true when need change.

func (*LineStringMapBuilderFilter) Matrixes added in v1.0.2 

func (l *LineStringMapBuilderFilter) Matrixes() []matrix.Matrix

Matrixes Returns the gathered Matrixes.

type LineStringTransformer 

type LineStringTransformer struct {
	Transformer
	// contains filtered or unexported fields
}

LineStringTransformer Transformer A framework for processes which transform an input linestring into 

an output Geometry, possibly changing its structure and type(s).

func (*LineStringTransformer) Transform 

func (l *LineStringTransformer) Transform(inputGeom matrix.Steric) (matrix.Steric, error)

Transform ...

type TaggedLineSegment 

type TaggedLineSegment struct {
	*matrix.LineSegment
	Parent matrix.Steric
	Index  int
}

TaggedLineSegment A LineSegment which is tagged with its location in a parent Geometry. 

Used to index the segments in a geometry and recover the segment locations
from the index.

func TaggedLineSegmentFour 

func TaggedLineSegmentFour(p0, p1 matrix.Matrix, parent matrix.Steric, index int) *TaggedLineSegment

TaggedLineSegmentFour four parameters create TaggedLineSegmentFour.

func TaggedLineSegmentTwo 

func TaggedLineSegmentTwo(p0, p1 matrix.Matrix) *TaggedLineSegment

TaggedLineSegmentTwo two parameters create TaggedLineSegmentFour.

type TaggedLineString 

type TaggedLineString struct {
	ParentLine matrix.LineMatrix
	Segs       []*TaggedLineSegment

	MinimumSize int
	// contains filtered or unexported fields
}

TaggedLineString Represents a LineString which can be modified to a simplified shape. 

This class provides an attribute which specifies the minimum allowable length for the modified result.

func (*TaggedLineString) AddToResult 

func (t *TaggedLineString) AddToResult(seg *matrix.LineSegment)

AddToResult ...

func (*TaggedLineString) AsLine 

func (t *TaggedLineString) AsLine() matrix.LineMatrix

AsLine ...

func (*TaggedLineString) GetParentMatrixes 

func (t *TaggedLineString) GetParentMatrixes() []matrix.Matrix

GetParentMatrixes ...

func (*TaggedLineString) GetResultMatrixes 

func (t *TaggedLineString) GetResultMatrixes() []matrix.Matrix

GetResultMatrixes ...

func (*TaggedLineString) GetResultSize 

func (t *TaggedLineString) GetResultSize() int

GetResultSize ...

func (*TaggedLineString) GetSegment 

func (t *TaggedLineString) GetSegment(i int) *TaggedLineSegment

GetSegment ...

type TaggedLineStringSimplifier 

type TaggedLineStringSimplifier struct {
	// contains filtered or unexported fields
}

TaggedLineStringSimplifier Simplifies a TaggedLineString, preserving topology 

(in the sense that no new intersections are introduced). Uses the recursive Douglas-Peucker algorithm.

func (*TaggedLineStringSimplifier) Remove 

func (t *TaggedLineStringSimplifier) Remove(line *TaggedLineString,
	start, end int)

Remove Remove the segs in the section of the line

func (*TaggedLineStringSimplifier) Simplify 

func (t *TaggedLineStringSimplifier) Simplify(line *TaggedLineString)

Simplify Simplifies the given TaggedLineString using the distance tolerance specified.

type TaggedLinesSimplifier 

type TaggedLinesSimplifier struct {
	// contains filtered or unexported fields
}

TaggedLinesSimplifier Simplifies a collection of TaggedLineStrings, preserving topology 

(in the sense that no new intersections are introduced).

func (*TaggedLinesSimplifier) Simplify 

func (t *TaggedLinesSimplifier) Simplify(taggedLines []*TaggedLineString)

Simplify Simplify a collection of TaggedLineStrings

type TopologyPreservingSimplifier 

type TopologyPreservingSimplifier struct {
	InputGeom matrix.Steric
	// contains filtered or unexported fields
}

TopologyPreservingSimplifier Simplifies a geometry and ensures that 

the result is a valid geometry having the
same dimension and number of components as the input,
and with the components having the same topological relationship.

func (*TopologyPreservingSimplifier) Simplify 

func (t *TopologyPreservingSimplifier) Simplify(geom matrix.Steric, distanceTolerance float64) matrix.Steric

Simplify ...

type Trans 

type Trans interface {
	// Transform ...
	Transform(inputGeom matrix.Steric) (matrix.Steric, error)
	// contains filtered or unexported methods
}

Trans A framework for processes which transform an input Geometry into 

an output  Geometry, possibly changing its structure and type(s).

type Transformer 

type Transformer struct {
	InputGeom matrix.Steric
	// contains filtered or unexported fields
}

Transformer A framework for processes which transform an input Geometry into 

an output  Geometry, possibly changing its structure and type(s).

func (*Transformer) Transform 

func (t *Transformer) Transform(inputGeom matrix.Steric) (matrix.Steric, error)

Transform ...

Source Files

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