/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

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

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  

*

*/

// INCLUDE FILES

#include "perfmon_graphscontainer.h"

#include "perfmon.hrh"

#include "perfmon_document.h"

#include "perfmon_appui.h"

#include "perfmon_model.h"

#include <aknutils.h>

const TInt KAmountOfMicroSecondsFitsScreen = 20 * 1000000;

#define KRgbCustomGrey TRgb(0x808080)

_LIT(K100p, "100%"); 

_LIT(K50p, "50%"); 

_LIT(K0p, "0%"); 

_LIT(KPercentageFormat,"%S %d%%");

const TInt KMicroToSecondMultiplier = 1000000;

// ===================================== MEMBER FUNCTIONS =====================================

void CPerfMonGraphsContainer::ConstructL(const TRect& aRect)

    {

    iModel = static_cast<CPerfMonDocument*>(reinterpret_cast<CEikAppUi*>(iEikonEnv->AppUi())->Document())->Model();

    //iFont = AknLayoutUtils::FontFromId(EAknLogicalFontPrimarySmallFont);

    iFont = LatinBold12();

    CreateWindowL();

    SetRect(aRect);

    SetBlank();

    ActivateL();

    }

// --------------------------------------------------------------------------------------------

CPerfMonGraphsContainer::~CPerfMonGraphsContainer()

    {

    }

// --------------------------------------------------------------------------------------------

void CPerfMonGraphsContainer::Draw(const TRect& aRect) const

    {

    // draw black background

    CWindowGc& gc = SystemGc();

    gc.SetBrushColor(KRgbBlack);

    gc.Clear(aRect);

    // activate font and get size

    gc.UseFont(iFont);

    TUint fontSize = iFont->FontMaxHeight();

    //TInt fontBaseOffset = iFont->DescentInPixels();

    // calculate time factor

    TReal scaleFactor = (TReal) aRect.Width() / (TReal) KAmountOfMicroSecondsFitsScreen;

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

    TInt drawAreaHeight = aRect.Height() - fontSize - fontSize;

    // check if sample array has been constructed

    if (iModel->SampleEntryArray())

        {

        // draw vertical time lines first

        TInt verticalBarPeriodInSecs = iModel->Settings().iGraphsVerticalBarPeriod;

        if (verticalBarPeriodInSecs >= 1 && iModel->SampleEntryArray()->At(0).iSampleDataArray->Count() > 0)

            {

            // get time from the first sample

            TSampleData& firstSample = iModel->SampleEntryArray()->At(0).iSampleDataArray->At(0);

            TInt64 currentMicroSeconds = firstSample.iTimeFromStart.Int64();

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

            TInt remainderInMicroSeconds = currentMicroSeconds % (verticalBarPeriodInSecs * 1000000); 

            // calculate first x pos

            TInt vbarXpos = aRect.Width() - (remainderInMicroSeconds * scaleFactor);

            // calculate the amount in seconds

            TInt barSeconds = (currentMicroSeconds - remainderInMicroSeconds) / KMicroToSecondMultiplier;

            // continue drawing periodically the vertical lines

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

                {

                // draw vertical line    

                gc.SetPenColor(KRgbDarkRed);

                gc.DrawLine(TPoint(vbarXpos,fontSize+1), TPoint(vbarXpos,aRect.Height()-fontSize));

                // draw seconds value

                gc.SetPenColor(KRgbCustomGrey);

                TBuf<16> secsBuf;

                secsBuf.AppendNum(barSeconds);    

                secsBuf.Append(_L("s"));

                gc.DrawText(secsBuf, TPoint(vbarXpos-(iFont->TextWidthInPixels(secsBuf)/2), aRect.Height()));    

                // calculate new position

                vbarXpos -= verticalBarPeriodInSecs * 1000000 * scaleFactor;

                barSeconds -= verticalBarPeriodInSecs;

                }

            }

        // draw the basic grid

        gc.SetPenColor(KRgbCustomGrey);

        gc.DrawLine(TPoint(0,fontSize), TPoint(aRect.Width(),fontSize));  // upper line

        gc.DrawText(K100p, TPoint(0,fontSize));

        gc.DrawLine(TPoint(0,aRect.Height()/2), TPoint(aRect.Width(),aRect.Height()/2));  // mid line

        gc.DrawText(K50p, TPoint(0,aRect.Height()/2));

        gc.DrawLine(TPoint(0,aRect.Height()-fontSize), TPoint(aRect.Width(),aRect.Height()-fontSize));  // bottom line

        gc.DrawText(K0p, TPoint(0,aRect.Height()-fontSize));

        TInt c(0);

        // draw graphs for each sampled type

        for (TInt i=0; i<iModel->SampleEntryArray()->Count(); i++)

            {

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

            if (iModel->Settings().iGraphsSources.iSrcEnabled[i] && iModel->SampleEntryArray()->At(i).iSampleDataArray->Count() > 0)

                {

                // set pen color for the graph

                gc.SetPenColor(iModel->SampleEntryArray()->At(i).iGraphColor);

                // remember the position where drawing started

                /*TReal*/TInt currentXPos(aRect.Width()); // start drawing from right            

                /*TReal*/TInt currentYPos(0);

                // draw samples

                for (TInt j=0; j<iModel->SampleEntryArray()->At(i).iSampleDataArray->Count() - 1; j++)

                    {

                    TSampleData& currentSample = iModel->SampleEntryArray()->At(i).iSampleDataArray->At(j);

                    TSampleData& previousSample = iModel->SampleEntryArray()->At(i).iSampleDataArray->At(j+1);

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

                    /*TReal*/TInt previousXPos = currentXPos -

                        ( (Abs(previousSample.iTimeFromStart.Int64() - currentSample.iTimeFromStart.Int64())) * scaleFactor );

                    // calculate initial Y position

                    if (j==0)

                        {

                        currentYPos = currentSample.iSize > 0 ? (TReal)(currentSample.iFree) / (TReal)currentSample.iSize * drawAreaHeight + fontSize : aRect.Height()-fontSize;

                        }

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

                    /*TReal*/TInt previousYPos = previousSample.iSize > 0 ? (TReal)(previousSample.iFree) / (TReal)previousSample.iSize * drawAreaHeight + fontSize : aRect.Height()-fontSize; 

                    // draw a line between the previous and current

                    gc.DrawLine(TPoint((TInt)previousXPos,(TInt)previousYPos), TPoint((TInt)currentXPos,(TInt)currentYPos));

                    // draw current value in %

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

                        {

                        TBuf<16> buf;

                        buf.Format(KPercentageFormat, &iModel->SampleEntryArray()->At(i).iDescription, currentSample.iSize > 0 ? TInt( (1 - ((TReal)(currentSample.iFree) / (TReal)currentSample.iSize)) * 100) : 0 );

                        gc.DrawText(buf, TPoint(0,fontSize+fontSize+c*fontSize));

                        c++;                    

                        }

                    // stop drawing if we have run out of space

                    if (previousXPos < 0)

                        break;

                    // remeber previous values

                    currentXPos = previousXPos;

                    currentYPos = previousYPos;

                    }

                }

            }

        }

    gc.DiscardFont();        

    }

// --------------------------------------------------------------------------------------------

TKeyResponse CPerfMonGraphsContainer::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)

    {

    return CCoeControl::OfferKeyEventL(aKeyEvent, aType);

    }

// --------------------------------------------------------------------------------------------

void CPerfMonGraphsContainer::HandleResourceChange(TInt aType)

    {

    if (aType == KEikDynamicLayoutVariantSwitch)

        {

        TRect mainPaneRect;

        AknLayoutUtils::LayoutMetricsRect(AknLayoutUtils::EMainPane, mainPaneRect);

        SetRect(mainPaneRect);

        }

    else

        CCoeControl::HandleResourceChange(aType);    

    }

// --------------------------------------------------------------------------------------------

void CPerfMonGraphsContainer::DrawUpdate()

    {

    DrawDeferred();    

    }

// --------------------------------------------------------------------------------------------

// End of File