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-rw-r--r--basegfx/source/curve/b2dbeziertools.cxx118
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diff --git a/basegfx/source/curve/b2dbeziertools.cxx b/basegfx/source/curve/b2dbeziertools.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#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(static_cast<double>(a) / static_cast<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(mnEdgeCount == 1)
+ {
+ // 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);
+ }
+
+} // end of namespace basegfx
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */