de.lmu.ifi.dbs.elki.visualization.visualizers.scatterplot.selection

Class DistanceFunctionVisualization

java.lang.Object

de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisFactory

de.lmu.ifi.dbs.elki.visualization.visualizers.scatterplot.selection.DistanceFunctionVisualization

All Implemented Interfaces:

VisualizationProcessor, VisFactory

public class DistanceFunctionVisualization
extends AbstractVisFactory

Factory for visualizers to generate an SVG-Element containing dots as markers representing the kNN of the selected Database objects. To use this, add a kNN preprocessor index to your database!

Author:

Erich Schubert, Robert Rödler

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	DistanceFunctionVisualization.Instance Instance, visualizing a particular set of kNNs

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME A short name characterizing this Visualizer.

Constructor Summary

Constructors

Constructor and Description
DistanceFunctionVisualization() Constructor

Method Summary

Methods

Modifier and Type	Method and Description
static Element	drawCosine(SVGPlot svgp, Projection2D proj, NumberVector mid, double angle) Visualizes Cosine and ArcCosine distance functions
static double	getLPNormP(AbstractMaterializeKNNPreprocessor<?> kNN) Get the "p" value of an Lp norm.
static boolean	isAngularDistance(AbstractMaterializeKNNPreprocessor<?> kNN) Test whether the given preprocessor used an angular distance function
Visualization	makeVisualization(VisualizationTask task, VisualizationPlot plot, double width, double height, Projection proj) Produce a visualization instance for the given task
void	processNewResult(VisualizerContext context, Object start) Add visualizers for the given result (tree) to the context.

Methods inherited from class de.lmu.ifi.dbs.elki.visualization.visualizers.AbstractVisFactory

allowThumbnails, makeVisualizationOrThumbnail

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

A short name characterizing this Visualizer.

See Also:

Constant Field Values

Constructor Detail

DistanceFunctionVisualization

public DistanceFunctionVisualization()

Constructor

Method Detail

makeVisualization

public Visualization makeVisualization(VisualizationTask task,
                              VisualizationPlot plot,
                              double width,
                              double height,
                              Projection proj)

Description copied from interface: VisFactory

Produce a visualization instance for the given task

Specified by:

makeVisualization in interface VisFactory

Specified by:

makeVisualization in class AbstractVisFactory

Parameters:

task - Visualization task

plot - Plot

width - Width

height - Height

proj - Projection

Returns:

Visualization

processNewResult

public void processNewResult(VisualizerContext context,
                    Object start)

Description copied from interface: VisFactory

Add visualizers for the given result (tree) to the context.

Parameters:

context - Visualization context

start - Result to process

getLPNormP

public static double getLPNormP(AbstractMaterializeKNNPreprocessor<?> kNN)

Get the "p" value of an Lp norm.

Parameters:

kNN - kNN preprocessor

Returns:

p of LP norm, or NaN

isAngularDistance

public static boolean isAngularDistance(AbstractMaterializeKNNPreprocessor<?> kNN)

Test whether the given preprocessor used an angular distance function

Parameters:

kNN - kNN preprocessor

Returns:

true when angular

drawCosine

public static Element drawCosine(SVGPlot svgp,
                 Projection2D proj,
                 NumberVector mid,
                 double angle)

Visualizes Cosine and ArcCosine distance functions

Parameters:

svgp - SVG Plot

proj - Visualization projection

mid - mean vector

angle - Opening angle in radians

Returns:

path element