org.eclipse.linuxtools.tracing.examples/src/org/eclipse/linuxtools/tracing/examples/ui/viewers/histogram/NewHistogramViewer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2013, 2014 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Alexandre Montplaisir - Initial API and implementation
  11  *   Bernd Hufmann - Updated to new TMF chart framework
  12  *******************************************************************************/
  13 package org.eclipse.linuxtools.tracing.examples.ui.viewers.histogram;
  14
  15 import java.util.Arrays;
  16 import java.util.List;
  17
  18 import org.eclipse.linuxtools.tmf.core.statistics.ITmfStatistics;
  19 import org.eclipse.linuxtools.tmf.core.statistics.TmfStatisticsModule;
  20 import org.eclipse.linuxtools.tmf.core.trace.ITmfTrace;
  21 import org.eclipse.linuxtools.tmf.core.trace.TmfTraceManager;
  22 import org.eclipse.linuxtools.tmf.ui.viewers.xycharts.barcharts.TmfBarChartViewer;
  23 import org.eclipse.swt.SWT;
  24 import org.eclipse.swt.widgets.Composite;
  25 import org.eclipse.swt.widgets.Display;
  26 import org.swtchart.Chart;
  27 import org.swtchart.IAxis;
  28 import org.swtchart.ISeries;
  29 import org.swtchart.LineStyle;
  30
  31 /**
  32  * Histogram Viewer implementation based on TmfBarChartViewer.
  33  *
  34  * @author Alexandre Montplaisir
  35  * @author Bernd Hufmann
  36  */
  37 public class NewHistogramViewer extends TmfBarChartViewer {
  38
  39     /**
  40      * Creates a Histogram Viewer instance.
  41      * @param parent
  42      *            The parent composite to draw in.
  43      */
  44     public NewHistogramViewer(Composite parent) {
  45         super(parent, null, null, null, TmfBarChartViewer.MINIMUM_BAR_WIDTH);
  46
  47         Chart swtChart = getSwtChart();
  48
  49         IAxis xAxis = swtChart.getAxisSet().getXAxis(0);
  50         IAxis yAxis = swtChart.getAxisSet().getYAxis(0);
  51
  52         /* Hide the grid */
  53         xAxis.getGrid().setStyle(LineStyle.NONE);
  54         yAxis.getGrid().setStyle(LineStyle.NONE);
  55
  56         /* Hide the legend */
  57         swtChart.getLegend().setVisible(false);
  58
  59         addSeries("Number of events", Display.getDefault().getSystemColor(SWT.COLOR_BLUE).getRGB()); //$NON-NLS-1$
  60     }
  61
  62     @Override
  63     protected void readData(final ISeries series, final long start, final long end, final int nb) {
  64         if (getTrace() != null) {
  65             final double y[] = new double[nb];
  66
  67             Thread thread = new Thread("Histogram viewer update") { //$NON-NLS-1$
  68                 @Override
  69                 public void run() {
  70                     double x[] = getXAxis(start, end, nb);
  71                     final long yLong[] = new long[nb];
  72                     Arrays.fill(y, 0.0);
  73
  74                     /* Add the values for each trace */
  75                     for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
  76                         /* Retrieve the statistics object */
  77                         final TmfStatisticsModule statsMod =
  78                                trace.getAnalysisModuleOfClass(TmfStatisticsModule.class, TmfStatisticsModule.ID);
  79                         if (statsMod == null) {
  80                             /* No statistics module available for this trace */
  81                             continue;
  82                         }
  83                         statsMod.waitForInitialization();
  84                         final ITmfStatistics stats = statsMod.getStatistics();
  85                         if (stats == null) {
  86                             /*
  87                              * Should not be null after waitForInitialization()
  88                              * is called.
  89                              */
  90                             throw new IllegalStateException();
  91                         }
  92                         List<Long> values = stats.histogramQuery(start, end, nb);
  93
  94                         for (int i = 0; i < nb; i++) {
  95                             yLong[i] += values.get(i);
  96                         }
  97                     }
  98
  99                     for (int i = 0; i < nb; i++) {
 100                         y[i] += yLong[i]; /* casting from long to double */
 101                     }
 102
 103                     /* Update the viewer */
 104                     drawChart(series, x, y);
 105                 }
 106             };
 107             thread.start();
 108         }
 109         return;
 110     }
 111 }