INTEGRATION: CWS aw033 (1.12.12); FILE MERGED

2008/05/14 14:41:46 aw 1.12.12.2: RESYNC: (1.12-1.13); FILE MERGED
2007/11/07 14:24:29 aw 1.12.12.1: #i39532# committing to have a base for HDU

1 files changed, 130 insertions, 2 deletions

diff --git a/basegfx/source/curve/b2dbeziertools.cxx b/basegfx/source/curve/b2dbeziertools.cxx
index de2cdb78291a..dd19356af488 100644
--- a/basegfx/source/curve/b2dbeziertools.cxx
+++ b/basegfx/source/curve/b2dbeziertools.cxx
@@ -7,7 +7,7 @@
  * OpenOffice.org - a multi-platform office productivity suite
  *
  * $RCSfile: b2dbeziertools.cxx,v $
- * $Revision: 1.13 $
+ * $Revision: 1.14 $
  *
  * This file is part of OpenOffice.org.
  *
@@ -30,9 +30,137 @@
 
 // MARKER(update_precomp.py): autogen include statement, do not remove
 #include "precompiled_basegfx.hxx"
+#include <basegfx/curve/b2dbeziertools.hxx>
 #include <basegfx/curve/b2dcubicbezier.hxx>
+#include <algorithm>
+
+//////////////////////////////////////////////////////////////////////////////
+
+namespace basegfx
+{
+    B2DCubicBezierHelper::B2DCubicBezierHelper(const B2DCubicBezier& rBase, sal_uInt32 nDivisions)
+    :   maLengthArray(),
+        mnEdgeCount(0)
+    {
+        const bool bIsBezier(rBase.isBezier());
+
+        if(bIsBezier)
+        {
+            // check nDivisions; at least one is needed, but also prevent too big values
+            if(nDivisions < 1)
+            {
+                nDivisions = 1;
+            }
+            else if(nDivisions > 1000)
+            {
+                nDivisions = 1000;
+            }
+
+            // set nEdgeCount
+            mnEdgeCount = nDivisions + 1;
+
+            // fill in maLengthArray
+            maLengthArray.clear();
+            maLengthArray.reserve(mnEdgeCount);
+            B2DPoint aCurrent(rBase.getStartPoint());
+            double fLength(0.0);
+
+            for(sal_uInt32 a(1);;)
+            {
+                const B2DPoint aNext(rBase.interpolatePoint((double)a / (double)mnEdgeCount));
+                const B2DVector aEdge(aNext - aCurrent);
+
+                fLength += aEdge.getLength();
+                maLengthArray.push_back(fLength);
+
+                if(++a < mnEdgeCount)
+                {
+                    aCurrent = aNext;
+                }
+                else
+                {
+                    const B2DPoint aLastNext(rBase.getEndPoint());
+                    const B2DVector aLastEdge(aLastNext - aNext);
+
+                    fLength += aLastEdge.getLength();
+                    maLengthArray.push_back(fLength);
+                    break;
+                }
+            }
+        }
+        else
+        {
+            maLengthArray.clear();
+            maLengthArray.push_back(rBase.getEdgeLength());
+            mnEdgeCount = 1;
+        }
+    }
+
+    double B2DCubicBezierHelper::distanceToRelative(double fDistance) const
+    {
+        if(fDistance <= 0.0)
+        {
+            return 0.0;
+        }
+
+        const double fLength(getLength());
+
+        if(fTools::moreOrEqual(fDistance, fLength))
+        {
+            return 1.0;
+        }
+
+        // fDistance is in ]0.0 .. fLength[
+
+        if(1 == mnEdgeCount)
+        {
+            // not a bezier, linear edge
+            return fDistance / fLength;
+        }
+
+        // it is a bezier
+        ::std::vector< double >::const_iterator aIter = ::std::lower_bound(maLengthArray.begin(), maLengthArray.end(), fDistance);
+        const sal_uInt32 nIndex(aIter - maLengthArray.begin());
+        const double fHighBound(maLengthArray[nIndex]);
+        const double fLowBound(nIndex ?  maLengthArray[nIndex - 1] : 0.0);
+        const double fLinearInterpolatedLength((fDistance - fLowBound) / (fHighBound - fLowBound));
+
+        return (static_cast< double >(nIndex) + fLinearInterpolatedLength) / static_cast< double >(mnEdgeCount);
+    }
+
+    double B2DCubicBezierHelper::relativeToDistance(double fRelative) const
+    {
+        if(fRelative <= 0.0)
+        {
+            return 0.0;
+        }
+
+        const double fLength(getLength());
+
+        if(fTools::moreOrEqual(fRelative, 1.0))
+        {
+            return fLength;
+        }
+
+        // fRelative is in ]0.0 .. 1.0[
+
+        if(1 == mnEdgeCount)
+        {
+            // not a bezier, linear edge
+            return fRelative * fLength;
+        }
+
+        // fRelative is in ]0.0 .. 1.0[
+        const double fIndex(fRelative * static_cast< double >(mnEdgeCount));
+        double fIntIndex;
+        const double fFractIndex(modf(fIndex, &fIntIndex));
+        const sal_uInt32 nIntIndex(static_cast< sal_uInt32 >(fIntIndex));
+        const double fStartDistance(nIntIndex ? maLengthArray[nIntIndex - 1] : 0.0);
+
+        return fStartDistance + ((maLengthArray[nIntIndex] - fStartDistance) * fFractIndex);
+    }
+} // end of namespace basegfx
 
 //////////////////////////////////////////////////////////////////////////////
-// necessary stuff moved to B2DCubicBezier
 
 // eof