de.lmu.ifi.dbs.elki.visualization.parallel3d

Class Parallel3DRenderer<O extends NumberVector>

java.lang.Object

de.lmu.ifi.dbs.elki.visualization.parallel3d.Parallel3DRenderer<O>

Type Parameters:

O - Object type

@Reference(authors="Elke Achtert, Hans-Peter Kriegel, Erich Schubert, Arthur Zimek",
           title="Interactive Data Mining with 3D-Parallel-Coordinate-Trees",
           booktitle="Proc. 2013 ACM Int. Conf. on Management of Data (SIGMOD 2013)",
           url="https://doi.org/10.1145/2463676.2463696",
           bibkey="DBLP:conf/sigmod/AchtertKSZ13")
public class Parallel3DRenderer<O extends NumberVector>
extends java.lang.Object

Renderer for 3D parallel plots.

The tricky part here is the vertex buffer layout. We are drawing lines, so we need two vertices for each macro edge (edge between axes in the plot). We furthermore need the following properties: we need to draw edges sorted by depth to allow alpha and smoothing to work, and we need to be able to have different colors for clusters. An efficient batch therefore will consist of one edge-color combination. The input data comes in color-object ordering, so we need to seek through the edges when writing the buffer.

In total, we have 2 * obj.size * edges.size vertices.

Where obj.size = sum(col.sizes)

Reference:

Elke Achtert, Hans-Peter Kriegel, Erich Schubert, Arthur Zimek:
Interactive Data Mining with 3D-Parallel-Coordinate-Trees.
Proc. 2013 ACM Int. Conf. on Management of Data (SIGMOD 2013)

TODO: generalize to non-numeric features and scales.

Since:

0.6.0

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
(package private) DoubleIntPair[]	axes Axes sorting array.
(package private) float[]	colors Color table.
private int	completedTextures Number of completely rendered textures.
private int[]	dindex Depth indexes of axes.
(package private) int[]	frameBufferID Framebuffer for render-to-texture
private static Logging	LOG Logging class.
(package private) OpenGL3DParallelCoordinates.Instance.Shared<O>	shared Shared data.
private int[]	textures Prerendered textures.
(package private) int[]	vbi Vertex buffer.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Parallel3DRenderer(OpenGL3DParallelCoordinates.Instance.Shared<O> shared) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	drawParallelPlot(javax.media.opengl.GLAutoDrawable drawable, javax.media.opengl.GL2 gl)
protected void	forgetTextures(javax.media.opengl.GL gl)
protected int	prepare(javax.media.opengl.GL2 gl)
private void	prepareColors(StylingPolicy sp)
private void	renderLabels(javax.media.opengl.GL2 gl, IntIntPair[] edgesort)
(package private) void	renderTexture(javax.media.opengl.GL2 gl, int edge)
private void	sortAxes() Depth-sort the axes.
private IntIntPair[]	sortEdges(int[] dindex) Sort the edges for rendering.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final Logging LOG

Logging class.

shared

OpenGL3DParallelCoordinates.Instance.Shared<O extends NumberVector> shared

Shared data.

textures

private int[] textures

Prerendered textures.

completedTextures

private int completedTextures

Number of completely rendered textures.

dindex

private int[] dindex

Depth indexes of axes.

colors

float[] colors

Color table.

axes

DoubleIntPair[] axes

Axes sorting array.

vbi

int[] vbi

Vertex buffer.

frameBufferID

int[] frameBufferID

Framebuffer for render-to-texture

Constructor Detail

Parallel3DRenderer

protected Parallel3DRenderer(OpenGL3DParallelCoordinates.Instance.Shared<O> shared)

Constructor.

Parameters:

shared - Shared data.

Method Detail

prepare

protected int prepare(javax.media.opengl.GL2 gl)

drawParallelPlot

protected void drawParallelPlot(javax.media.opengl.GLAutoDrawable drawable,
                                javax.media.opengl.GL2 gl)

renderTexture

void renderTexture(javax.media.opengl.GL2 gl,
                   int edge)

prepareColors

private void prepareColors(StylingPolicy sp)

forgetTextures

protected void forgetTextures(javax.media.opengl.GL gl)

sortAxes

private void sortAxes()

Depth-sort the axes.

sortEdges

private IntIntPair[] sortEdges(int[] dindex)

Sort the edges for rendering. FIXME: THIS STILL HAS ERRORS SOMETIME!

Parameters:

dindex - depth index of axes.

Returns:

Sorted array of (minaxis, edgeid)

renderLabels

private void renderLabels(javax.media.opengl.GL2 gl,
                          IntIntPair[] edgesort)