examples/Graphics/WS/Direct/CDirectDisplayLife.cpp

/*
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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Description:  
*/


#include <coemain.h>

#include "CDirectDisplayLife.h"

// Dimension of each cell
const TInt CDirectDisplayLife::KBlockSize = 20;
// Delay between generations (microseconds)
// Actual minimum is 1/10s on WINS
const TInt CDirectDisplayLife::KGenerationInterval = 70000;
// X & Y origins of upper left of cell display
const TInt CDirectDisplayLife::iXOrigin = 50;
const TInt CDirectDisplayLife::iYOrigin = 30;

CDirectDisplayLife::CDirectDisplayLife(RWsSession& aClient, 
                                                                           RWindow& aWindow,
                                                                           CLifeEngine& aLifeEngine)
: CTimer(CActive::EPriorityStandard),
        iClient(aClient),
        iWindow(aWindow),
        iLifeEngine(aLifeEngine)
        {
        }

CDirectDisplayLife::~CDirectDisplayLife()
        {
        Cancel();
        delete iDirectScreenAccess;
        }

void CDirectDisplayLife::ConstructL()
        {
        CTimer::ConstructL();
        // Create the DSA object
        iDirectScreenAccess = CDirectScreenAccess::NewL(
                iClient,                                // WS session
                *(CCoeEnv::Static()->ScreenDevice()),           // CWsScreenDevice
                iWindow,                                // RWindowBase
                *this                                   // MDirectScreenAccess
                );

        CActiveScheduler::Add(this);
        }

// Start game display
void CDirectDisplayLife::StartL()
        {
        // Initialise DSA
        iDirectScreenAccess -> StartL();
        // Get graphics context for it
        iGc = iDirectScreenAccess -> Gc();
        iGc -> SetBrushStyle(CGraphicsContext::ESolidBrush);
        // Get region that DSA can draw in
        iRegion = iDirectScreenAccess -> DrawingRegion();
        // Set the display to clip to this region
        iGc -> SetClippingRegion(iRegion); 

        After(TTimeIntervalMicroSeconds32(KGenerationInterval));
        }
        
// Implement MDirectScreenAccess
void CDirectDisplayLife::Restart(RDirectScreenAccess::TTerminationReasons /*aReason*/)
        {
        // Restart display
        // Note that this will result in the clipping region being updated
        // so that menus, overlaying dialogs, etc. will not be drawn over
        TRAPD(err,StartL());
        if(err != KErrNone)
                {
                User::Panic(_L("Failed to Restart display"),err);
                }
        }

void CDirectDisplayLife::AbortNow(RDirectScreenAccess::TTerminationReasons /*aReason*/)
        {
        // Cancel timer and display
        Cancel();
        }

// Draw cells using DSA
void CDirectDisplayLife::RunL()
        {
        // Update engine
        iLifeEngine.AddGeneration();
        const TCellArray& iCells = iLifeEngine.GetCellArray();

        // Loop through cells drawing each
        TRect drawBlock(iXOrigin, iYOrigin, iXOrigin+KBlockSize,iYOrigin+KBlockSize);
        for (int y=0; y<DIM_Y_ARRAY; y++)
                {
                for (int x=0; x<DIM_X_ARRAY; x++)
                        {
                        if (iCells[x][y])
                                iGc -> SetBrushColor(KRgbBlue);
                        else
                                iGc -> SetBrushColor(KRgbYellow);
                        iGc -> DrawRect(drawBlock);
                        drawBlock.Move(KBlockSize,0);

                        // Redraw the changed areas
                        TPoint modified;
                        modified.iX = iXOrigin+KBlockSize;
                        modified.iY = iYOrigin+KBlockSize;

                        // Update the screen for the areas that have been redrawn
                        iDirectScreenAccess->ScreenDevice()->Update();
                        }
                drawBlock.iTl.iX = iXOrigin;
                drawBlock.iBr.iX = iXOrigin+KBlockSize;
                drawBlock.Move(0,KBlockSize);
                }
        iClient.Flush();
        // Renew request
        After(TTimeIntervalMicroSeconds32(KGenerationInterval));
        }

void CDirectDisplayLife::DoCancel()
        {
        // Cancel timer
        CTimer::DoCancel();
        // Cancel DSA
        iDirectScreenAccess -> Cancel();
        }

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