/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------------
* HeatMapUtilities.java
* ---------------------
* (C) Copyright 2009, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes:
* --------
* 28-Jan-2009 : Version 1 (DG);
*
*/
package org.jfree.data.general;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.image.BufferedImage;
import org.jfree.chart.renderer.PaintScale;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
/**
* A utility class for the {@link HeatMapDataset}.
*
* @since 1.0.13
*/
public abstract class HeatMapUtilities {
/**
* Returns a dataset containing one series that holds a copy of the (x, z)
* data from one row (y-index) of the specified dataset.
*
* @param dataset the dataset (<code>null</code> not permitted).
* @param row the row (y) index.
* @param seriesName the series name/key (<code>null</code> not permitted).
*
* @return The dataset.
*/
public static XYDataset extractRowFromHeatMapDataset(HeatMapDataset dataset,
int row, Comparable seriesName) {
XYSeries series = new XYSeries(seriesName);
int cols = dataset.getXSampleCount();
for (int c = 0; c < cols; c++) {
series.add(dataset.getXValue(c), dataset.getZValue(c, row));
}
XYSeriesCollection result = new XYSeriesCollection(series);
return result;
}
/**
* Returns a dataset containing one series that holds a copy of the (y, z)
* data from one column (x-index) of the specified dataset.
*
* @param dataset the dataset (<code>null</code> not permitted).
* @param column the column (x) index.
* @param seriesName the series name (<code>null</code> not permitted).
*
* @return The dataset.
*/
public static XYDataset extractColumnFromHeatMapDataset(
HeatMapDataset dataset, int column, Comparable seriesName) {
XYSeries series = new XYSeries(seriesName);
int rows = dataset.getYSampleCount();
for (int r = 0; r < rows; r++) {
series.add(dataset.getYValue(r), dataset.getZValue(column, r));
}
XYSeriesCollection result = new XYSeriesCollection(series);
return result;
}
/**
* Creates an image that displays the values from the specified dataset.
*
* @param dataset the dataset (<code>null</code> not permitted).
* @param paintScale the paint scale for the z-values (<code>null</code>
* not permitted).
*
* @return A buffered image.
*/
public static BufferedImage createHeatMapImage(HeatMapDataset dataset,
PaintScale paintScale) {
if (dataset == null) {
throw new IllegalArgumentException("Null 'dataset' argument.");
}
if (paintScale == null) {
throw new IllegalArgumentException("Null 'paintScale' argument.");
}
int xCount = dataset.getXSampleCount();
int yCount = dataset.getYSampleCount();
BufferedImage image = new BufferedImage(xCount, yCount,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = image.createGraphics();
for (int xIndex = 0; xIndex < xCount; xIndex++) {
for (int yIndex = 0; yIndex < yCount; yIndex++) {
double z = dataset.getZValue(xIndex, yIndex);
Paint p = paintScale.getPaint(z);
g2.setPaint(p);
g2.fillRect(xIndex, yCount - yIndex - 1, 1, 1);
}
}
return image;
}
}
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