程序包 org.wowtools.giscat.vector.mvt

类 MvtBuilder

java.lang.Object

org.wowtools.giscat.vector.mvt.MvtBuilder

public class MvtBuilder
extends Object

mvt瓦片构造器

作者:

liuyu

createdate

2022/4/24

字段概要

字段

修饰符和类型	字段	说明
protected int	extent
protected org.wowtools.giscat.util.analyse.TileClip	tileClip

构造器概要

构造器

构造器	说明
MvtBuilder(int z, int x, int y, int extent, int clipBuffer, org.locationtech.jts.geom.GeometryFactory geometryFactory)	Create with the given extent value.
MvtBuilder(int z, int x, int y, org.locationtech.jts.geom.GeometryFactory geometryFactory)

方法概要

修饰符和类型	方法	说明
org.wowtools.giscat.util.analyse.Bbox	getBbox()
MvtLayer	getOrCreateLayer(String layerName)	新建或获取一个图层，不对geometry进行简化
MvtLayer	getOrCreateLayer(String layerName, int simplifyDistance)	新建或获取一个图层，按simplifyDistance的值简化geometry
byte[]	toBytes()	转为 bytes

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

extent

protected final int extent

tileClip

protected final org.wowtools.giscat.util.analyse.TileClip tileClip

构造器详细资料

MvtBuilder

public MvtBuilder(int z,
                  int x,
                  int y,
                  org.locationtech.jts.geom.GeometryFactory geometryFactory)

MvtBuilder

public MvtBuilder(int z,
                  int x,
                  int y,
                  int extent,
                  int clipBuffer,
                  org.locationtech.jts.geom.GeometryFactory geometryFactory)

Create with the given extent value.

The extent value control how detailed the coordinates are encoded in the vector tile. 4096 is a good default, 256 can be used to reduce density.

The clip buffer value control how large the clipping area is outside of the tile for geometries. 0 means that the clipping is done at the tile border. 8 is a good default.

参数:

extent - a int with extent value. 4096 is a good value.

clipBuffer - a int with clip buffer size for geometries. 8 is a good value.

方法详细资料

getOrCreateLayer

public MvtLayer getOrCreateLayer(String layerName,
                                 int simplifyDistance)

新建或获取一个图层，按simplifyDistance的值简化geometry

参数:

layerName - 图层名

simplifyDistance - 对geometry进行简化的长度,单位是瓦片像素，取值范围[0,extent+clipBuffer]，为0时表示不做简化

返回:

若已有同名图层则返回现有图层，否则新建一个

getOrCreateLayer

public MvtLayer getOrCreateLayer(String layerName)

新建或获取一个图层，不对geometry进行简化

参数:

layerName - 图层名

返回:

若已有同名图层则返回现有图层，否则新建一个

getBbox

public org.wowtools.giscat.util.analyse.Bbox getBbox()

toBytes

public byte[] toBytes()

转为 bytes

返回:

bytes