openlayers 3 -ol3中的缓冲区分析依赖于ol.extent的方法

ol.extent

Methods

ol.extent.applyTransform(extent, transformFn, opt_extent){ol.Extent}

src/ol/extent.js, line 863

Apply a transform function to the extent.

Name	Type	Description
extent	ol.Extent	Extent.
transformFn	ol.TransformFunction	Transform function. Called with [minX, minY, maxX, maxY] extent coordinates.
extent	ol.Extent	Destination extent.

Returns:

Extent. 

ol.extent.boundingExtent(coordinates){ol.Extent}

src/ol/extent.js, line 54

Build an extent that includes all given coordinates.

Name	Type	Description
coordinates	Array.<ol.Coordinate>	Coordinates.

Returns:

Bounding extent. 

ol.extent.buffer(extent, value, opt_extent){ol.Extent}

src/ol/extent.js, line 89

Return extent increased by the provided value.

Name	Type	Description
extent	ol.Extent	Extent.
value	number	The amount by which the extent should be buffered.
extent	ol.Extent	Extent.

Returns:

Extent. 

ol.extent.containsCoordinate(extent, coordinate){boolean}

src/ol/extent.js, line 161

Check if the passed coordinate is contained or on the edge of the extent.

Name	Type	Description
extent	ol.Extent	Extent.
coordinate	ol.Coordinate	Coordinate.

Returns:

The coordinate is contained in the extent. 

ol.extent.containsExtent(extent1, extent2){boolean}

src/ol/extent.js, line 178

Check if one extent contains another.

An extent is deemed contained if it lies completely within the other extent, including if they share one or more edges.

Name	Type	Description
extent1	ol.Extent	Extent 1.
extent2	ol.Extent	Extent 2.

Returns:

The second extent is contained by or on the edge of the first. 

ol.extent.containsXY(extent, x, y){boolean}

src/ol/extent.js, line 193

Check if the passed coordinate is contained or on the edge of the extent.

Name	Type	Description
extent	ol.Extent	Extent.
x	number	X coordinate.
y	number	Y coordinate.

Returns:

The x, y values are contained in the extent. 

ol.extent.createEmpty(){ol.Extent}

src/ol/extent.js, line 235

Create an empty extent.

Returns:

Empty extent. 

ol.extent.equals(extent1, extent2){boolean}

src/ol/extent.js, line 341

Determine if two extents are equivalent.

Name	Type	Description
extent1	ol.Extent	Extent 1.
extent2	ol.Extent	Extent 2.

Returns:

The two extents are equivalent. 

ol.extent.extend(extent1, extent2){ol.Extent}

src/ol/extent.js, line 354

Modify an extent to include another extent.

Name	Type	Description
extent1	ol.Extent	The extent to be modified.
extent2	ol.Extent	The extent that will be included in the first.

Returns:

A reference to the first (extended) extent. 

ol.extent.getBottomLeft(extent){ol.Coordinate}

src/ol/extent.js, line 500

Get the bottom left coordinate of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Bottom left coordinate. 

ol.extent.getBottomRight(extent){ol.Coordinate}

src/ol/extent.js, line 511

Get the bottom right coordinate of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Bottom right coordinate. 

ol.extent.getCenter(extent){ol.Coordinate}

src/ol/extent.js, line 522

Get the center coordinate of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Center. 

ol.extent.getHeight(extent){number}

src/ol/extent.js, line 599

Get the height of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Height. 

ol.extent.getIntersection(extent1, extent2, opt_extent){ol.Extent}

src/ol/extent.js, line 623

Get the intersection of two extents.

Name	Type	Description
extent1	ol.Extent	Extent 1.
extent2	ol.Extent	Extent 2.
extent	ol.Extent	Optional extent to populate with intersection.

Returns:

Intersecting extent. 

ol.extent.getSize(extent){ol.Size}

src/ol/extent.js, line 666

Get the size (width, height) of an extent.

Name	Type	Description
extent	ol.Extent	The extent.

Returns:

The extent size. 

ol.extent.getTopLeft(extent){ol.Coordinate}

src/ol/extent.js, line 677

Get the top left coordinate of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Top left coordinate. 

ol.extent.getTopRight(extent){ol.Coordinate}

src/ol/extent.js, line 688

Get the top right coordinate of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Top right coordinate. 

ol.extent.getWidth(extent){number}

src/ol/extent.js, line 699

Get the width of an extent.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Width. 

ol.extent.intersects(extent1, extent2){boolean}

src/ol/extent.js, line 711

Determine if one extent intersects another.

Name	Type	Description
extent1	ol.Extent	Extent 1.
extent2	ol.Extent	Extent.

Returns:

The two extents intersect. 

ol.extent.isEmpty(extent){boolean}

src/ol/extent.js, line 725

Determine if an extent is empty.

Name	Type	Description
extent	ol.Extent	Extent.

Returns:

Is empty.