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POBar Chart with MouseOver handling
 

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  1. POBar Chart with MouseOver handling
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    <p>I have found <a href="http://www.swtchart.org" rel="nofollow">SWTChart library</a> and I tried to implement a box with the info about the y-value when you go over the bar chart like in this <a href="http://teethgrinder.co.uk/open-flash-chart/gallery-bar.php" rel="nofollow">example</a>. </p> <p>However, the following code does not show any information about the y value.</p> <pre><code>package org.swtchart.examples; 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.IBarSeries; import org.swtchart.ISeries; import org.swtchart.ISeries.SeriesType; /** * An example for bar chart. */ public class BarChartExampleMouseOver { private static final double[] ySeries = { 0.2, 1.1, 1.9, 2.3, 1.8, 1.5, 1.8, 2.6, 2.9, 3.2 }; /* Used to remember the location of the highlight point */ private static int highlightX; private static int highlightY; protected static boolean highlight; /** * The main method. * * @param args * the arguments */ public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setText("Bar 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("Bar Chart"); chart.getAxisSet().getXAxis(0).getTitle().setText("Data Points"); chart.getAxisSet().getYAxis(0).getTitle().setText("Amplitude"); // create bar series IBarSeries barSeries = (IBarSeries) chart.getSeriesSet().createSeries( SeriesType.BAR, "bar series"); barSeries.setYSeries(ySeries); // adjust the axis range chart.getAxisSet().adjustRange(); /* Get the plot area and add the mouse listeners */ final Composite plotArea = chart.getPlotArea(); plotArea.addListener(SWT.MouseHover, new Listener() { @Override public void handleEvent(Event event) { IAxis xAxis = chart.getAxisSet().getXAxis(0); IAxis yAxis = chart.getAxisSet().getYAxis(0); double x = xAxis.getDataCoordinate(event.x); double y = yAxis.getDataCoordinate(event.y); ISeries[] series = chart.getSeriesSet().getSeries(); double closestX = 0; double closestY = 0; double minDist = Double.MAX_VALUE; /* over all series */ for (ISeries serie : series) { double[] xS = serie.getXSeries(); double[] yS = serie.getYSeries(); /* check all data points */ for (int i = 0; i &lt; xS.length; i++) { /* compute distance to mouse position */ double newDist = Math.sqrt(Math.pow((x - xS[i]), 2) + Math.pow((y - yS[i]), 2)); /* if closer to mouse, remember */ if (newDist &lt; minDist) { minDist = newDist; closestX = xS[i]; closestY = yS[i]; } } } /* set tooltip of closest data point */ plotArea.setToolTipText(closestX + " " + closestY); /* remember closest data point */ highlightX = xAxis.getPixelCoordinate(closestX); highlightY = yAxis.getPixelCoordinate(closestY); highlight = true; /* trigger repaint (paint highlight) */ plotArea.redraw(); } }); plotArea.addListener(SWT.MouseMove, new Listener() { @Override public void handleEvent(Event arg0) { highlight = false; plotArea.redraw(); } }); plotArea.addListener(SWT.Paint, new Listener() { @Override public void handleEvent(Event event) { if (highlight) { GC gc = event.gc; gc.setBackground(Display.getDefault().getSystemColor( SWT.COLOR_RED)); gc.setAlpha(128); gc.fillOval(highlightX - 5, highlightY - 5, 10, 10); } } }); return chart; } } </code></pre> <p>Thank you in advance</p>
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    1. USuser977828
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      1. POBar Chart with MouseOver handling
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    2. COHow is it possible to do [this](http://teethgrinder.co.uk/open-flash-chart/gallery-bar.php) with [SWTChart library](http://www.swtchart.org)?
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      1. POBar Chart with MouseOver handling
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