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copied!<p>The following code should give you an idea on how to do this. Basically, you have to get the <code>chartArea</code> of the <code>chart</code>, add the listeners for <code>SWT.MouseDown</code> and <code>SWT.MouseUp</code> and remember the position of both events. To answer your comment: Yes, you can add a "highlight" functionality by using the <code>SWT.Paint</code> listener.</p> <pre><code>import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.swtchart.Chart; import org.swtchart.IAxis; import org.swtchart.ILineSeries; import org.swtchart.ISeries.SeriesType; /** * An example for area chart. */ public class AreaChartExample { private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 }; private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 }; /* Used to remember location point of mouse down */ private static double startX; private static double startY; private static int startXPos; private static int startYPos; private static int currentX; private static int currentY; private static boolean drag = false; /** * The main method. * * @param args * the arguments */ public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Area Chart"); shell.setSize(500, 400); shell.setLayout(new FillLayout()); createChart(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) { display.sleep(); } } display.dispose(); } /** * create the chart. * * @param parent * The parent composite * @return The created chart */ static public Chart createChart(Composite parent) { // create a chart final Chart chart = new Chart(parent, SWT.NONE); // set titles chart.getTitle().setText("Area Chart"); // create line series ILineSeries lineSeries1 = (ILineSeries) chart.getSeriesSet() .createSeries(SeriesType.LINE, "line series 1"); lineSeries1.setYSeries(ySeries1); lineSeries1.setLineColor(Display.getDefault().getSystemColor( SWT.COLOR_RED)); lineSeries1.enableArea(true); ILineSeries lineSeries2 = (ILineSeries) chart.getSeriesSet() .createSeries(SeriesType.LINE, "line series 2"); lineSeries2.setYSeries(ySeries2); lineSeries2.enableArea(true); // adjust the axis range chart.getAxisSet().adjustRange(); /* Get the plot area and add the mouse listeners */ final Composite plotArea = chart.getPlotArea(); plotArea.addListener(SWT.MouseDown, new Listener() { @Override public void handleEvent(Event event) { IAxis xAxis = chart.getAxisSet().getXAxis(0); IAxis yAxis = chart.getAxisSet().getYAxis(0); startX = xAxis.getDataCoordinate(event.x); startY = yAxis.getDataCoordinate(event.y); startXPos = event.x; startYPos = event.y; drag = true; } }); plotArea.addListener(SWT.MouseUp, new Listener() { @Override public void handleEvent(Event event) { IAxis xAxis = chart.getAxisSet().getXAxis(0); IAxis yAxis = chart.getAxisSet().getYAxis(0); double endX = xAxis.getDataCoordinate(event.x); double endY = yAxis.getDataCoordinate(event.y); System.out.println(startX + " " + endX); System.out.println(startY + " " + endY); drag = false; plotArea.redraw(); } }); plotArea.addListener(SWT.MouseMove, new Listener() { @Override public void handleEvent(Event event) { if(drag) { currentX = event.x; currentY = event.y; plotArea.redraw(); } } }); plotArea.addListener(SWT.Paint, new Listener() { @Override public void handleEvent(Event event) { if(drag) { GC gc = event.gc; gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_RED)); gc.setAlpha(128); int minX = Math.min(startXPos, currentX); int minY = Math.min(startYPos, currentY); int maxX = Math.max(startXPos, currentX); int maxY = Math.max(startYPos, currentY); int width = maxX - minX; int height = maxY - minY; gc.fillRectangle(minX, minY, width, height); } } }); return chart; } } </code></pre>

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