--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/skins/AknSkins/polysrc/AknsAlPolyLine1D.cpp	Thu Dec 17 09:14:12 2009 +0200
@@ -0,0 +1,110 @@
+/*
+* Copyright (c) 2004-2008 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:  PolySpline.
+*
+*/
+
+
+#include "AknsAlPolyLine1D.h"
+
+
+// -----------------------------------------------------------------------------
+// C++ constructor.
+// -----------------------------------------------------------------------------
+//
+CAknsAlPolyLine1D::CAknsAlPolyLine1D()
+    {
+    }
+
+// -----------------------------------------------------------------------------
+// Destructor.
+// -----------------------------------------------------------------------------
+//
+CAknsAlPolyLine1D::~CAknsAlPolyLine1D()
+    {
+    }
+
+// -----------------------------------------------------------------------------
+// Symbian 1st phase constructor.
+// -----------------------------------------------------------------------------
+//
+CAknsAlPolyLine1D* CAknsAlPolyLine1D::NewL()
+    { // static
+    CAknsAlPolyLine1D* self=new(ELeave) CAknsAlPolyLine1D();
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// Gets poly point.
+// -----------------------------------------------------------------------------
+//
+TPoint CAknsAlPolyLine1D::GetPolyPoint( const TUint32 aPosition )
+    {
+    // linepoints have x-coordinates between 0...16bit,
+    // so we only need to use upper 16 bits from aPosition
+    TInt pos = aPosition >> 16;
+
+    // find the line, where pos is pointing
+    TInt i = 0; // first index
+    TInt j = iPointCount-1; // last index
+    TInt k;
+    while ( i < j )
+        {
+        k = (i + j)/2;
+        if ( pos < iPoints[k].iX )
+            {
+            j = k;
+            }
+        else
+            {
+            i = k + 1;
+            }
+        }
+    // i = j = wanted line's end point index
+
+    TUint32 deltaX = iPoints[i].iX - iPoints[i-1].iX; // always positive, 16 bits
+    TUint32 deltaY; // might be negative, so use flag to get correct results
+    TBool negativeY = EFalse;
+    if ((iPoints[i].iY - iPoints[i-1].iY) < 0)
+        {
+        deltaY = iPoints[i-1].iY - iPoints[i].iY;
+        negativeY = ETrue;
+        }
+    else
+        {
+        deltaY = iPoints[i].iY - iPoints[i-1].iY;
+        }
+    pos -= iPoints[i-1].iX;
+
+    if (pos == 0) // we are in line's first pixel
+        {
+        return TPoint((iPoints[i-1].iX * iAreaSize.iWidth) >> 16,
+                  (iPoints[i-1].iY * iAreaSize.iHeight) >> 16);
+        }
+
+    TUint32 calculatedY = (deltaY * pos) / deltaX; // first get delta from start point
+    if (negativeY)
+        {
+        calculatedY = iPoints[i-1].iY - calculatedY; // line going downwards
+        }
+    else
+        {
+        calculatedY = iPoints[i-1].iY + calculatedY; // line going upwards
+        }
+
+    return CalculateScaledPoint(TPoint(aPosition >> 16,calculatedY));
+    }
+
+// End of file
+