edu.umn.cs.spatialHadoop.visualization

Class Rasterizer

java.lang.Object

edu.umn.cs.spatialHadoop.visualization.Rasterizer

Direct Known Subclasses:

GeometricPlot.GeometricRasterizer, HDFPlot2.HDFRasterizer, HeatMapPlot.HeatMapRasterizer, RoadNetworkPlot.GeometricRasterizer, SVGPlot.SVGRasterizer

public abstract class Rasterizer
extends java.lang.Object

An abstract interface for a component that rasterizes shapes

Constructor Summary

Constructors

Constructor and Description
Rasterizer()

Method Summary

Methods

Modifier and Type	Method and Description
void	configure(Configuration conf) Configures this rasterizer according to the MapReduce program.
abstract RasterLayer	createRaster(int width, int height, Rectangle mbr) Creates an empty raster layer of the given width and height.
int	getRadius() Returns the radius in pixels that one object might affect in the image.
java.lang.Class<? extends RasterLayer>	getRasterClass() Returns the raster class associated with this rasterizer
static Rasterizer	getRasterizer(Configuration job)
boolean	isSmooth() Tells whether this rasterizer supports a smooth function or not.
abstract void	merge(RasterLayer finalLayer, RasterLayer intermediateLayer) Merges an intermediate layer into the final layer based on its location
void	rasterize(RasterLayer layer, java.lang.Iterable<? extends Shape> shapes) Rasterizes a set of shapes to the given layer
void	rasterize(RasterLayer layer, java.util.Iterator<? extends Shape> shapes) Rasterize a set of records by calling the rasterize function on each one.
abstract void	rasterize(RasterLayer layer, Shape shape) Rasterizes one shape to the given layer
static void	setRasterizer(Configuration job, java.lang.Class<? extends Rasterizer> rasterizerClass)
<S extends Shape> java.lang.Iterable<S>	smooth(java.lang.Iterable<S> r) Smooth a set of records that are spatially close to each other and returns a new set of smoothed records.
abstract void	writeImage(RasterLayer layer, java.io.DataOutputStream out, boolean vflip) Writes a raster layer as an image to the output.

Methods inherited from class java.lang.Object

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

Constructor Detail

Rasterizer

public Rasterizer()

Method Detail

setRasterizer

public static void setRasterizer(Configuration job,
                 java.lang.Class<? extends Rasterizer> rasterizerClass)

getRasterizer

public static Rasterizer getRasterizer(Configuration job)

configure

public void configure(Configuration conf)

Configures this rasterizer according to the MapReduce program.

Parameters:

conf -

createRaster

public abstract RasterLayer createRaster(int width,
                       int height,
                       Rectangle mbr)

Creates an empty raster layer of the given width and height.

Parameters:

width - - Width of the created layer in pixels

height - - Height of the created layer in pixels

mbr - - The minimal bounding rectangle of the layer in the input

Returns:

rasterize

public void rasterize(RasterLayer layer,
             java.lang.Iterable<? extends Shape> shapes)

Rasterizes a set of shapes to the given layer

Parameters:

layer - - the layer to rasterize to. This layer has to be created using the method createRaster(int, int, Rectangle).

shapes - - a set of shapes to rasterize

rasterize

public void rasterize(RasterLayer layer,
             java.util.Iterator<? extends Shape> shapes)

Rasterize a set of records by calling the rasterize function on each one.

Parameters:

layer -

shapes -

rasterize

public abstract void rasterize(RasterLayer layer,
             Shape shape)

Rasterizes one shape to the given layer

Parameters:

layer - - the layer to rasterize to. This layer has to be created using the method createRaster(int, int, Rectangle).

shape - - the shape to rasterize

getRasterClass

public java.lang.Class<? extends RasterLayer> getRasterClass()

Returns the raster class associated with this rasterizer

Returns:

merge

public abstract void merge(RasterLayer finalLayer,
         RasterLayer intermediateLayer)

Merges an intermediate layer into the final layer based on its location

Parameters:

finalLayer -

intermediateLayer -

writeImage

public abstract void writeImage(RasterLayer layer,
              java.io.DataOutputStream out,
              boolean vflip)
                         throws java.io.IOException

Writes a raster layer as an image to the output.

Parameters:

layer - - the layer to be written to the output as an image

out - - the output stream to which the image will be written

vflip - - if true, the image is vertically flipped before written

Throws:

java.io.IOException

getRadius

public int getRadius()

Returns the radius in pixels that one object might affect in the image. This is used to ensure that each image is generated correctly by using all records in the buffer area.

Returns:

smooth

public <S extends Shape> java.lang.Iterable<S> smooth(java.lang.Iterable<S> r)

Smooth a set of records that are spatially close to each other and returns a new set of smoothed records. This method is called on the original raw data before it is visualized. The results of this function are the records that are visualized.

Parameters:

r -

Returns:

isSmooth

public boolean isSmooth()

Tells whether this rasterizer supports a smooth function or not.

Returns: