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Fabian Prasser
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<?xml version="1.0" encoding="UTF-8"?> | ||
<classpath> | ||
<classpathentry kind="src" path="src/main"/> | ||
<classpathentry kind="src" path="src/swt"/> | ||
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/> | ||
<classpathentry kind="lib" path="lib/swt-4.2.1-gtk-linux-x86_64.jar"/> | ||
<classpathentry kind="output" path="bin"/> | ||
</classpath> |
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<?xml version="1.0" encoding="UTF-8"?> | ||
<projectDescription> | ||
<name>JHeatMapControl</name> | ||
<comment></comment> | ||
<projects> | ||
</projects> | ||
<buildSpec> | ||
<buildCommand> | ||
<name>org.eclipse.jdt.core.javabuilder</name> | ||
<arguments> | ||
</arguments> | ||
</buildCommand> | ||
</buildSpec> | ||
<natures> | ||
<nature>org.eclipse.jdt.core.javanature</nature> | ||
</natures> | ||
</projectDescription> |
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add_header=true | ||
add_todo=false | ||
eclipse.preferences.version=1 | ||
header_text=/*\n* JHC - Java Heatmap Control\n* Copyright (C) 2014 Fabian Prasser\n*\n* This program is free software\: you can redistribute it and/or modify\n* it under the terms of the GNU General Public License as published by\n* the Free Software Foundation, either version 3 of the License, or\n* (at your option) any later version.\n*\n* This program is distributed in the hope that it will be useful,\n* but WITHOUT ANY WARRANTY; without even the implied warranty of\n* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n* GNU General Public License for more details.\n*\n* You should have received a copy of the GNU General Public License\n* along with this program. If not, see <http\://www.gnu.org/licenses/>.\n*/ | ||
mode=mode_replace | ||
multi_header=true | ||
project_specific_settings=true | ||
replace_header=true | ||
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eclipse.preferences.version=1 | ||
formatter_profile=_eclipse-cs FLASH | ||
formatter_settings_version=12 |
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eclipse.preferences.version=1 | ||
org.jboss.ide.eclipse.as.core.singledeployable.deployableList=\n |
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GNU LESSER GENERAL PUBLIC LICENSE | ||
Version 3, 29 June 2007 | ||
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Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> | ||
Everyone is permitted to copy and distribute verbatim copies | ||
of this license document, but changing it is not allowed. | ||
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This version of the GNU Lesser General Public License incorporates | ||
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As used herein, "this License" refers to version 3 of the GNU Lesser | ||
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You may convey a covered work under sections 3 and 4 of this License | ||
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JHC - Java Heatmap Control | ||
==== | ||
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This project implements a widget/control that displays [heat maps](https://en.wikipedia.org/wiki/Heat_map). | ||
JHMC is available for all major Java toolkits, the Standard Widget Toolkit (SWT), Swing and the Abstract Window Toolkit (AWT). For rendering, | ||
the native interfaces of the toolkits are used (avoiding the infamous SWT_AWT bridge). The main feature of JHC is that it is able | ||
to display very large heat maps efficiently. | ||
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[![Screenshot-1](https://raw.github.com/prasser/jhc/master/img/screenshot1.png)](https://raw.github.com/prasser/jhc/master/img/screenshot1.png) | ||
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Introduction | ||
------ | ||
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In JHC heat maps are not represented as two-dimensional arrays but as sets of points. This allows to only sparsely populate the space | ||
defined by the domains of the attributes involved. Moreover, heat maps are computed on-demand for the current size of the widget, | ||
respecting a pre-defined maximal size. In case of very large heat maps, the data itself is scaled down instead of a rendered image. | ||
Computations are performed in a background thread, allowing time-consuming processes, e.g. extensive disk access, when rendering a heat map. | ||
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When scaling heat maps down, JHC currently uses the arithmetic mean to aggregate values and dynamically | ||
adjusts the minimum and maximum of the scale to these aggregates. In future releases, it is planned to | ||
make this process configurable (e.g. using static minima and maxima or different aggregate functions). | ||
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There are multiple ways in which data can be provided to JHC. Firstly, different variants of the static method JHCData.create(...) | ||
allow handling two-dimensional arrays of primitive Java data types. Secondly, the interface JHCDataProvider can be implemented | ||
to provide arbitrary two-dimensional data, e.g. from disk, via JHCData.create(...). Finally, the abstract class | ||
JHCData can itself be extended to implement a custom process for computing heat maps. To this end, the following classes must be implemented: | ||
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[![Classes](https://raw.github.com/prasser/jhc/master/img/classes.png)](https://raw.github.com/prasser/jhc/master/img/classes.png) | ||
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JHC will repeatedly call JHCData.getHeatmap(...) to retrieve an instance of the heat map for a specific | ||
size. This call will be performed from a background thread. As a result, an instance of JHCHeatmap must be returned | ||
that provides data points via an iterator over instances of the interface JHCHeatmap.Point. Each data point | ||
associates a value with an x-coordinate and a y-coordinate. Each coordinate represents one tick on the according | ||
axis. Associated labels must be returned from calls to JHCHeatmap.getXLabel(x) and getYLabel(y), respectively. | ||
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Customization | ||
------ | ||
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JHC currently supports a customizable layout as well as different gradients for the heat map. Gradients are | ||
inspired by [plotly](https://plot.ly/). See [here](http://nbviewer.ipython.org/github/plotly/python-user-guide/blob/master/s5_heatmaps/s5_heatmaps.ipynb#Plotly%27s-pre-defined-color-scales) | ||
for a description of the color scales currently implemented. | ||
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The class JHCLayout allows defining the following offsets and lengths: | ||
* Offsets: from left, right, top, bottom, between heat map and scale and between labels | ||
* Length: length of small and large ticks | ||
* Rotation: labels for ticks can be rotated and drawn within given maximal bounds | ||
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Compatibility | ||
------ | ||
JHC has been tested on all major platforms, MS Windows, Linux and OS X (with and without Retina-Displays), and all major toolkits, | ||
SWT, AWT and Swing. | ||
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Example (SWT) | ||
------ | ||
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```Java | ||
// Define scales | ||
JHCScale<String> xScale = new JHCScale.String(new String[] { "X1", "X2", "X3" }); | ||
JHCScale<String> yScale = new JHCScale.String(new String[] { "Y1", "Y2", "Y3" }); | ||
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// Configure | ||
JHCLayout layout = new JHCLayout(true, 20, true, 20); | ||
JHCConfiguration config = new JHCConfiguration("x-label", "y-label", JHCGradient.GRADIENT_HEAT, layout); | ||
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// Create array | ||
int[][] array = {{0,1,0}, {1,0,1}, {0,1,0}}; | ||
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// Create data object | ||
JHCData data = JHCData.create(array, xScale, yScale); | ||
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// Create JHC widget | ||
JHC jhc = new JHC(shell, SWT.NONE); | ||
jhc.setData(data, config); | ||
``` | ||
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Download | ||
------ | ||
A binary version for AWT is available for download [here](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-awt.jar) | ||
([Javadoc](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-awt-doc.jar)). | ||
A binary version for Swing is available for download [here](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-swing.jar) | ||
([Javadoc](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-swing-doc.jar)). | ||
A binary version for SWT is available for download [here](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-swt.jar) | ||
([Javadoc](https://rawgithub.com/prasser/jhc/master/jars/jhc-1.0.0-swt-doc.jar)). | ||
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Documentation | ||
------ | ||
Online Javadoc for AWT can be found [here](https://rawgithub.com/prasser/jhc/master/doc/awt/index.html). | ||
Online Javadoc for Swing can be found [here](https://rawgithub.com/prasser/jhc/master/doc/swing/index.html). | ||
Online Javadoc for SWT can be found [here](https://rawgithub.com/prasser/jhc/master/doc/swt/index.html). |
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