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Module geom reference
geom module contains utilities to manage geometries
Note
To get more information about Geometry methods see Geometry javadoc
Commons geometries methods
Interface Geometry: This interface is equivalent to the GM_Object specified in ISO 19107. A geometric object shall be a combination of a coordinate geometry and a coordinate reference system.
- area(): Return geometry area
- buffer(distance): Computes a buffer area around this geometry having the given width
- centroid(): Return geometry centroid
- distance(geometry): Returns the minimum distance between this Geometry and the specified geometry.
- getEnvelope(): Returns the minimum bounding box for this Geometry.
- getGeometryType(): Instance of the GeometryType associated to this geometry
- getDimension(): Returns the largest number n such that each direct position in a geometric set can be associated with a subset that has the direct position in its interior and is similar (isomorphic) to Rn, Euclidean n-space
Geometry types
Point
This interface is equivalent to the GM_Point specified in ISO 19107. It is one of the basic data type for a geometric object consisting of one and only one point. They do not have volume, area, length, or any other higher-dimensional analogue.
- getX(): Returns the X coordinate
- getY(): Returns the Y coordinate
- getCoordinateAt(dimension): Gets the coordinate in a concrete dimension
- param dimension: Dimension coordinate to get
- type dimension: integer
- allowed values: 0=X, 1=Y, 2=Z
- setX(value): Sets the X coordinate
- param value: Value of the dimension X
- type value: double
- setY(value): Sets the Y coordinate
- param value: Value of the dimension Y
- type value: double
- setCoordinateAt(dimension, value): Sets a ordinate in a concrete dimension
- param dimension: Dimension coordinate to set
- type dimension: integer
- param value: Value of the dimension
- type value: double
Line
This interface is equivalent to the GM_OrientableCurve specified in ISO 19107. Curves are continuous, connected, and have a measurable length in terms of the coordinate system.
- addVertex(point): Adds a vertex to the curve
- param point: Point to addLayer
- type: Point
- getNumVertices(): Gets the number of vertex of the curve
- getVertex(index): Gets a vertex
- param index: Geometry vertex index
- type index: integer
Polygon
This interface is equivalent to the GM_Surface specified in ISO 19107. This is the basis for 2-dimensional geometry
- addVertex(point): Adds a vertex to the curve
- param point: Point to addLayer
- type: Point
- getNumVertices(): Gets the number of vertex of the curve
- getVertex(index): Gets a vertex
- param index: Geometry vertex index
- type index: integer
- getSurfaceAppearance(): Gets surface appearance
- setSurfaceAppearance(appearance): Sets surface appearance
Multigeometry
This interface is equivalent to the GM_Aggregate specified in ISO 19107
- getPrimitiveAt(int i): Returns one of the Primitive's that is in a concrete position. - param i: geometry position - type i: integer
- getPrimitivesNumber(): Returns the number of Primitive's that composes this multi geometry.
Geometry util functions
- createGeometry(type[, subtype]): Create a new geometry with a concrete type
and subtype
- param type: geometry type
- type type: integer
- param subtype: (Optional) geometry subtype
- type type: integer
- return: geometry
- rtype: Geometry
- createPoint([x][, y][, subtype]): Create a new point with a subtype dimensions
and sets the value for 'X' and 'Y' coordinates. If is used without parameters
will return new Point2D with (0,0) coordinates
- param x:(Optional) X coordinate value
- type x: double
- param y:(Optional) Y coordinate value
- type y: double
- param subtype: (Optional) geometry dimensions
- type: integer
- return: Point
- rtype: Point
- createMultiPoint(points[, subtype]): Create a new multipoint with a
subtype from a list values of X and Y like ([x1, y1], [x2, y2], ...., [xn, yn])
- param points: list of tuples with X and Y values
- type points: list
- param subtype: (Optional) geometry dimensions
- type: integer
- return: multipoint
- rtype: multipoint
