1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
package de.lmu.ifi.dbs.elki.visualization.visualizers;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import org.w3c.dom.Element;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreEvent;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreListener;
import de.lmu.ifi.dbs.elki.result.Result;
import de.lmu.ifi.dbs.elki.result.ResultListener;
import de.lmu.ifi.dbs.elki.visualization.VisualizationTask;
import de.lmu.ifi.dbs.elki.visualization.VisualizerContext;
import de.lmu.ifi.dbs.elki.visualization.svg.SVGPlot;
/**
* Abstract base class for visualizations.
*
* @author Erich Schubert
* @apiviz.excludeSubtypes
*/
public abstract class AbstractVisualization implements Visualization, ResultListener {
/**
* The visualization task we do.
*/
protected final VisualizationTask task;
/**
* Our context
*/
protected final VisualizerContext context;
/**
* The plot we are attached to
*/
protected final SVGPlot svgp;
/**
* Pending redraw
*/
protected Runnable pendingRedraw = null;
/**
* Layer storage
*/
protected Element layer;
/**
* Constructor.
*
* @param task Visualization task
*/
public AbstractVisualization(VisualizationTask task) {
super();
this.task = task;
this.context = task.getContext();
this.svgp = task.getPlot();
this.layer = null;
// Note: we do not auto-add listeners, as we don't know what kind of
// listeners a visualizer needs, and the visualizer might need to do some initialization first
}
@Override
public void destroy() {
// Always unregister listeners, as this is easy to forget otherwise
// TODO: remove destroy() overrides that are redundant?
context.removeResultListener(this);
if (this instanceof DataStoreListener) {
context.removeDataStoreListener((DataStoreListener) this);
}
}
@Override
public Element getLayer() {
if(layer == null) {
incrementalRedraw();
}
return layer;
}
/**
* Get the width
*
* @return the width
*/
protected double getWidth() {
return task.getWidth();
}
/**
* Get the height
*
* @return the height
*/
protected double getHeight() {
return task.getHeight();
}
/**
* Trigger a redraw, but avoid excessive redraws.
*/
protected final void synchronizedRedraw() {
Runnable pr = new Runnable() {
@Override
public void run() {
if(AbstractVisualization.this.pendingRedraw == this) {
AbstractVisualization.this.pendingRedraw = null;
AbstractVisualization.this.incrementalRedraw();
}
}
};
pendingRedraw = pr;
svgp.scheduleUpdate(pr);
}
/**
* Redraw the visualization (maybe incremental).
*
* Optional - by default, it will do a full redraw, which often is faster!
*/
protected void incrementalRedraw() {
Element oldcontainer = null;
if(layer != null && layer.hasChildNodes()) {
oldcontainer = layer;
layer = (Element) layer.cloneNode(false);
}
redraw();
if(oldcontainer != null && oldcontainer.getParentNode() != null) {
oldcontainer.getParentNode().replaceChild(layer, oldcontainer);
}
}
/**
* Perform a full redraw.
*/
protected abstract void redraw();
@Override
public void resultAdded(Result child, Result parent) {
// Ignore by default
}
@Override
public void resultChanged(Result current) {
// Default is to redraw when the result we are attached to changed.
if(task.getResult() == current) {
synchronizedRedraw();
}
}
@Override
public void resultRemoved(Result child, Result parent) {
// Ignore by default.
}
/**
* Default implementation for
* {@link de.lmu.ifi.dbs.elki.database.datastore.DataStoreListener#contentChanged}
*
* Not enabled or used by default, but saves redundant code.
*
* @param e Data store event
*/
public void contentChanged(DataStoreEvent e) {
synchronizedRedraw();
}
}
|
