1 /*

     2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    17 

    18 #include "graphdatacontainer.h"

    19 #include "enginewrapper.h"

    20 

    21 #include <QPainter>

    22 #include <QFontMetrics>

    23 

    24 const int amountOfMicroSecondsFitsScreen = 20 * 1000000;

    25 const int microToSecondMultiplier = 1000000;

    26 

    27 GraphDataContainer::GraphDataContainer(const EngineWrapper& engine, QGraphicsItem *parent) :

    28     DataContainer(engine, parent)

    29 {

    30     HbFontSpec spec(HbFontSpec::Secondary);

    31     mFont = spec.font();

    32     mFont.setPixelSize(12);

    33 }

    34 

    35 void GraphDataContainer::paint (QPainter *painter,

    36     const QStyleOptionGraphicsItem *option,

    37     QWidget *widget)

    38 {

    39     Q_UNUSED(option);

    40     Q_UNUSED(widget);

    41 

    42     // set proper font and prepare font metrics for text width / height calculation

    43     painter->setFont(mFont);

    44     QFontMetricsF metrics(mFont);

    45 

    46     // fill background with black color

    47     painter->fillRect(rect(), Qt::black);

    48 

    49     // calculate time factor

    50     qreal scaleFactor = rect().width() / (qreal) amountOfMicroSecondsFitsScreen;

    51 

    52     // calculate area height which is used to draw the grpahs

    53     qreal drawAreaHeight = rect().height() - 2 * metrics.height();

    54 

    55 

    56     const QList<SampleEntry> sampleEntries = engine().sampleEntries();

    57 

    58     // check if sample array has been constructed

    59     if (sampleEntries.length())

    60     {

    61         // draw vertical time lines first

    62         int verticalBarPeriodInSecs = engine().settings().graphVerticalBarPeriod();

    63 

    64         if (verticalBarPeriodInSecs >= 1 && sampleEntries.first().sampleCount() > 0)

    65         {

    66             // get time from the first sample

    67             const SampleData& firstSample = sampleEntries.first().sample(0);

    68             qint64 currentMicroSeconds = firstSample.mTimeFromStart;

    69 

    70             // calculate amount of microseconds exceeding value by using the modulo operator

    71             int remainderInMicroSeconds = currentMicroSeconds % (verticalBarPeriodInSecs * 1000000);

    72 

    73             // calculate first x pos

    74             qreal vbarXpos = rect().width() - (remainderInMicroSeconds * scaleFactor);

    75 

    76             // calculate the amount in seconds

    77             int barSeconds = (currentMicroSeconds - remainderInMicroSeconds) / microToSecondMultiplier;

    78 

    79             // continue drawing periodically the vertical lines

    80             while (vbarXpos >= 0 && barSeconds >= 0)

    81             {

    82                 // draw vertical line

    83                 painter->setPen(Qt::darkRed);

    84                 painter->drawLine(QPointF(vbarXpos, metrics.height() + 1),

    85                                   QPointF(vbarXpos, rect().height() - metrics.height()));

    86 

    87                 // draw seconds value

    88                 painter->setPen(Qt::darkGray);

    89                 QString secsText = QString("%1s").arg(barSeconds);

    90                 QPointF secsPos(vbarXpos - metrics.width(secsText) / 2,

    91                                 rect().height());

    92                 painter->drawText(secsPos, secsText);

    93 

    94                 // calculate new position

    95                 vbarXpos -= verticalBarPeriodInSecs * 1000000 * scaleFactor;

    96                 barSeconds -= verticalBarPeriodInSecs;

    97             }

    98         }

    99 

   100         // draw the basic grid

   101         painter->setPen(Qt::darkGray);

   102 

   103         qreal axisY = metrics.height();

   104         painter->drawLine(QPointF(0, axisY), QPointF(rect().width(), axisY)); // upper line

   105         painter->drawText(QPointF(0, axisY), tr("100%"));

   106 

   107         axisY = rect().height() / 2;

   108         painter->drawLine(QPointF(0, axisY), QPointF(rect().width(), axisY)); // mid line

   109         painter->drawText(QPointF(0, axisY), tr("50%"));

   110 

   111         axisY = rect().height() - metrics.height();

   112         painter->drawLine(QPointF(0, axisY), QPointF(rect().width(), axisY)); // bottom line

   113         painter->drawText(QPointF(0, axisY), tr("0%"));

   114 

   115         int c = 0;

   116         // draw graphs for each sampled type

   117         for (int i=0; i<sampleEntries.length(); i++)

   118         {

   119             // check if this setting has been enabled and it has some data

   120             if (engine().settings().graphSources().isEnabled(i) &&

   121                 sampleEntries.at(i).sampleCount() > 0)

   122             {

   123                 // set pen color for the graph

   124                 painter->setPen(sampleEntries.at(i).graphColor());

   125 

   126                 // remember the position where drawing started

   127                 qreal currentXPos(rect().width()); // start drawing from right

   128                 qreal currentYPos(0.);

   129 

   130                 // draw samples

   131                 for (int j=0; j<sampleEntries.at(i).sampleCount()-1; j++)

   132                 {

   133                     const SampleData& currentSample = sampleEntries.at(i).sample(j);

   134                     const SampleData& previousSample = sampleEntries.at(i).sample(j+1);

   135 

   136                     // calculate X position for previous (j+1)

   137                     qreal previousXPos = currentXPos -

   138                         qAbs(previousSample.mTimeFromStart - currentSample.mTimeFromStart) * scaleFactor;

   139 

   140 

   141                     // calculate initial Y position

   142                     if (j==0)

   143                     {

   144                         currentYPos = currentSample.mSize > 0 ?

   145                             drawAreaHeight * currentSample.mFree / currentSample.mSize + metrics.height() :

   146                             rect().height() - metrics.height();

   147                     }

   148 

   149                     // calculate Y position for previous (j+1)

   150                     qreal previousYPos = previousSample.mSize > 0 ?

   151                         drawAreaHeight * previousSample.mFree / previousSample.mSize + metrics.height() :

   152                         rect().height() - metrics.height();

   153 

   154 

   155                     // draw a line between the previous and current

   156                     painter->drawLine(QPointF(previousXPos, previousYPos),

   157                                       QPointF(currentXPos, currentYPos));

   158 

   159                     // draw current value in %

   160                     if (j==0) // draw the value of first sample

   161                     {

   162                         qreal perc = currentSample.mSize > 0 ?

   163                                      100. - 100. * currentSample.mFree / currentSample.mSize : 0;

   164                         QString percText = QString ("%1 %2%").

   165                                            arg(sampleEntries.at(i).description()).

   166                                            arg(perc, 0, 'f', 0);

   167 

   168                         painter->drawText(QPointF(0, metrics.height() * (c + 2)),

   169                                           percText);

   170                         c++;

   171                     }

   172 

   173 

   174                     // stop drawing if we have run out of space

   175                     if (previousXPos < 0)

   176                         break;

   177 

   178                     // remeber previous values

   179                     currentXPos = previousXPos;

   180                     currentYPos = previousYPos;

   181                 }

   182 

   183 

   184             }

   185         }

   186 

   187     }

   188 }