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| -rw-r--r-- | basegfx/source/polygon/b3dpolygontools.cxx | 836 |
1 files changed, 836 insertions, 0 deletions
diff --git a/basegfx/source/polygon/b3dpolygontools.cxx b/basegfx/source/polygon/b3dpolygontools.cxx new file mode 100644 index 000000000..bf982f9c3 --- /dev/null +++ b/basegfx/source/polygon/b3dpolygontools.cxx @@ -0,0 +1,836 @@ +/* -*- 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 <osl/diagnose.h> +#include <basegfx/polygon/b3dpolygontools.hxx> +#include <basegfx/polygon/b3dpolygon.hxx> +#include <basegfx/polygon/b3dpolypolygon.hxx> +#include <basegfx/numeric/ftools.hxx> +#include <basegfx/range/b3drange.hxx> +#include <basegfx/point/b2dpoint.hxx> +#include <basegfx/tuple/b3ituple.hxx> +#include <rtl/math.hxx> +#include <numeric> + +namespace basegfx::utils +{ + // B3DPolygon tools + void checkClosed(B3DPolygon& rCandidate) + { + while(rCandidate.count() > 1 + && rCandidate.getB3DPoint(0).equal(rCandidate.getB3DPoint(rCandidate.count() - 1))) + { + rCandidate.setClosed(true); + rCandidate.remove(rCandidate.count() - 1); + } + } + + sal_uInt32 getIndexOfSuccessor(sal_uInt32 nIndex, const B3DPolygon& rCandidate) + { + OSL_ENSURE(nIndex < rCandidate.count(), "getIndexOfPredecessor: Access to polygon out of range (!)"); + + if(nIndex + 1 < rCandidate.count()) + { + return nIndex + 1; + } + else + { + return 0; + } + } + + B3DRange getRange(const B3DPolygon& rCandidate) + { + B3DRange aRetval; + const sal_uInt32 nPointCount(rCandidate.count()); + + for(sal_uInt32 a(0); a < nPointCount; a++) + { + const B3DPoint aTestPoint(rCandidate.getB3DPoint(a)); + aRetval.expand(aTestPoint); + } + + return aRetval; + } + + double getLength(const B3DPolygon& rCandidate) + { + double fRetval(0.0); + const sal_uInt32 nPointCount(rCandidate.count()); + + if(nPointCount > 1) + { + const sal_uInt32 nLoopCount(rCandidate.isClosed() ? nPointCount : nPointCount - 1); + + for(sal_uInt32 a(0); a < nLoopCount; a++) + { + const sal_uInt32 nNextIndex(getIndexOfSuccessor(a, rCandidate)); + const B3DPoint aCurrentPoint(rCandidate.getB3DPoint(a)); + const B3DPoint aNextPoint(rCandidate.getB3DPoint(nNextIndex)); + const B3DVector aVector(aNextPoint - aCurrentPoint); + fRetval += aVector.getLength(); + } + } + + return fRetval; + } + + void applyLineDashing( + const B3DPolygon& rCandidate, + const std::vector<double>& rDotDashArray, + B3DPolyPolygon* pLineTarget, + double fDotDashLength) + { + // clear targets in any case + if(pLineTarget) + { + pLineTarget->clear(); + } + + // provide callback as lambda + auto aLineCallback( + nullptr == pLineTarget + ? std::function<void(const basegfx::B3DPolygon&)>() + : [&pLineTarget](const basegfx::B3DPolygon& rSnippet){ pLineTarget->append(rSnippet); }); + + // call version that uses callbacks + applyLineDashing( + rCandidate, + rDotDashArray, + aLineCallback, + fDotDashLength); + } + + static void implHandleSnippet( + const B3DPolygon& rSnippet, + std::function<void(const basegfx::B3DPolygon& rSnippet)>& rTargetCallback, + B3DPolygon& rFirst, + B3DPolygon& rLast) + { + if(rSnippet.isClosed()) + { + if(!rFirst.count()) + { + rFirst = rSnippet; + } + else + { + if(rLast.count()) + { + rTargetCallback(rLast); + } + + rLast = rSnippet; + } + } + else + { + rTargetCallback(rSnippet); + } + } + + static void implHandleFirstLast( + std::function<void(const basegfx::B3DPolygon& rSnippet)>& rTargetCallback, + B3DPolygon& rFirst, + B3DPolygon& rLast) + { + if(rFirst.count() && rLast.count() + && rFirst.getB3DPoint(0).equal(rLast.getB3DPoint(rLast.count() - 1))) + { + // start of first and end of last are the same -> merge them + rLast.append(rFirst); + rLast.removeDoublePoints(); + rFirst.clear(); + } + + if(rLast.count()) + { + rTargetCallback(rLast); + } + + if(rFirst.count()) + { + rTargetCallback(rFirst); + } + } + + void applyLineDashing( + const B3DPolygon& rCandidate, + const std::vector<double>& rDotDashArray, + std::function<void(const basegfx::B3DPolygon& rSnippet)> aLineTargetCallback, + double fDotDashLength) + { + const sal_uInt32 nPointCount(rCandidate.count()); + const sal_uInt32 nDotDashCount(rDotDashArray.size()); + + if(fTools::lessOrEqual(fDotDashLength, 0.0)) + { + fDotDashLength = std::accumulate(rDotDashArray.begin(), rDotDashArray.end(), 0.0); + } + + if(fTools::lessOrEqual(fDotDashLength, 0.0) || !aLineTargetCallback || !nPointCount) + { + // parameters make no sense, just add source to targets + if(aLineTargetCallback) + { + aLineTargetCallback(rCandidate); + } + + return; + } + + // precalculate maximal acceptable length of candidate polygon assuming + // we want to create a maximum of fNumberOfAllowedSnippets. In 3D + // use less for fNumberOfAllowedSnippets, ca. 6553.6, double due to line & gap. + // Less in 3D due to potentially blowing up to rounded line segments. + static double fNumberOfAllowedSnippets(6553.5 * 2.0); + const double fAllowedLength((fNumberOfAllowedSnippets * fDotDashLength) / double(rDotDashArray.size())); + const double fCandidateLength(basegfx::utils::getLength(rCandidate)); + std::vector<double> aDotDashArray(rDotDashArray); + + if(fCandidateLength > fAllowedLength) + { + // we would produce more than fNumberOfAllowedSnippets, so + // adapt aDotDashArray to exactly produce assumed number. Also + // assert this to let the caller know about it. + // If this asserts: Please think about checking your DotDashArray + // before calling this function or evtl. use the callback version + // to *not* produce that much of data. Even then, you may still + // think about producing too much runtime (!) + assert(true && "applyLineDashing: potentially too expensive to do the requested dismantle - please consider stretched LineDash pattern (!)"); + + // calculate correcting factor, apply to aDotDashArray and fDotDashLength + // to enlarge these as needed + const double fFactor(fCandidateLength / fAllowedLength); + std::for_each(aDotDashArray.begin(), aDotDashArray.end(), [&fFactor](double &f){ f *= fFactor; }); + fDotDashLength *= fFactor; + } + + // prepare current edge's start + B3DPoint aCurrentPoint(rCandidate.getB3DPoint(0)); + const bool bIsClosed(rCandidate.isClosed()); + const sal_uInt32 nEdgeCount(bIsClosed ? nPointCount : nPointCount - 1); + + // prepare DotDashArray iteration and the line/gap switching bool + sal_uInt32 nDotDashIndex(0); + bool bIsLine(true); + double fDotDashMovingLength(aDotDashArray[0]); + B3DPolygon aSnippet; + + // remember 1st and last snippets to try to merge after execution + // is complete and hand to callback + B3DPolygon aFirstLine, aLastLine; + + // iterate over all edges + for(sal_uInt32 a(0); a < nEdgeCount; a++) + { + // update current edge + const sal_uInt32 nNextIndex((a + 1) % nPointCount); + const B3DPoint aNextPoint(rCandidate.getB3DPoint(nNextIndex)); + const double fEdgeLength(B3DVector(aNextPoint - aCurrentPoint).getLength()); + + if(!fTools::equalZero(fEdgeLength)) + { + double fLastDotDashMovingLength(0.0); + while(fTools::less(fDotDashMovingLength, fEdgeLength)) + { + // new split is inside edge, create and append snippet [fLastDotDashMovingLength, fDotDashMovingLength] + const bool bHandleLine(bIsLine && aLineTargetCallback); + + if(bHandleLine) + { + if(!aSnippet.count()) + { + aSnippet.append(interpolate(aCurrentPoint, aNextPoint, fLastDotDashMovingLength / fEdgeLength)); + } + + aSnippet.append(interpolate(aCurrentPoint, aNextPoint, fDotDashMovingLength / fEdgeLength)); + + implHandleSnippet(aSnippet, aLineTargetCallback, aFirstLine, aLastLine); + + aSnippet.clear(); + } + + // prepare next DotDashArray step and flip line/gap flag + fLastDotDashMovingLength = fDotDashMovingLength; + fDotDashMovingLength += aDotDashArray[(++nDotDashIndex) % nDotDashCount]; + bIsLine = !bIsLine; + } + + // append snippet [fLastDotDashMovingLength, fEdgeLength] + const bool bHandleLine(bIsLine && aLineTargetCallback); + + if(bHandleLine) + { + if(!aSnippet.count()) + { + aSnippet.append(interpolate(aCurrentPoint, aNextPoint, fLastDotDashMovingLength / fEdgeLength)); + } + + aSnippet.append(aNextPoint); + } + + // prepare move to next edge + fDotDashMovingLength -= fEdgeLength; + } + + // prepare next edge step (end point gets new start point) + aCurrentPoint = aNextPoint; + } + + // append last intermediate results (if exists) + if(aSnippet.count()) + { + const bool bHandleLine(bIsLine && aLineTargetCallback); + + if(bHandleLine) + { + implHandleSnippet(aSnippet, aLineTargetCallback, aFirstLine, aLastLine); + } + } + + if(bIsClosed && aLineTargetCallback) + { + implHandleFirstLast(aLineTargetCallback, aFirstLine, aLastLine); + } + } + + B3DPolygon applyDefaultNormalsSphere( const B3DPolygon& rCandidate, const B3DPoint& rCenter) + { + B3DPolygon aRetval(rCandidate); + + for(sal_uInt32 a(0); a < aRetval.count(); a++) + { + B3DVector aVector(aRetval.getB3DPoint(a) - rCenter); + aVector.normalize(); + aRetval.setNormal(a, aVector); + } + + return aRetval; + } + + B3DPolygon invertNormals( const B3DPolygon& rCandidate) + { + B3DPolygon aRetval(rCandidate); + + if(aRetval.areNormalsUsed()) + { + for(sal_uInt32 a(0); a < aRetval.count(); a++) + { + aRetval.setNormal(a, -aRetval.getNormal(a)); + } + } + + return aRetval; + } + + B3DPolygon applyDefaultTextureCoordinatesParallel( const B3DPolygon& rCandidate, const B3DRange& rRange, bool bChangeX, bool bChangeY) + { + B3DPolygon aRetval(rCandidate); + + if(bChangeX || bChangeY) + { + // create projection of standard texture coordinates in (X, Y) onto + // the 3d coordinates straight + const double fWidth(rRange.getWidth()); + const double fHeight(rRange.getHeight()); + const bool bWidthSet(!fTools::equalZero(fWidth)); + const bool bHeightSet(!fTools::equalZero(fHeight)); + const double fOne(1.0); + + for(sal_uInt32 a(0); a < aRetval.count(); a++) + { + const B3DPoint aPoint(aRetval.getB3DPoint(a)); + B2DPoint aTextureCoordinate(aRetval.getTextureCoordinate(a)); + + if(bChangeX) + { + if(bWidthSet) + { + aTextureCoordinate.setX((aPoint.getX() - rRange.getMinX()) / fWidth); + } + else + { + aTextureCoordinate.setX(0.0); + } + } + + if(bChangeY) + { + if(bHeightSet) + { + aTextureCoordinate.setY(fOne - ((aPoint.getY() - rRange.getMinY()) / fHeight)); + } + else + { + aTextureCoordinate.setY(fOne); + } + } + + aRetval.setTextureCoordinate(a, aTextureCoordinate); + } + } + + return aRetval; + } + + B3DPolygon applyDefaultTextureCoordinatesSphere( const B3DPolygon& rCandidate, const B3DPoint& rCenter, bool bChangeX, bool bChangeY) + { + B3DPolygon aRetval(rCandidate); + + if(bChangeX || bChangeY) + { + // create texture coordinates using sphere projection to cartesian coordinates, + // use object's center as base + const double fOne(1.0); + const sal_uInt32 nPointCount(aRetval.count()); + bool bPolarPoints(false); + sal_uInt32 a; + + // create center cartesian coordinates to have a possibility to decide if on boundary + // transitions which value to choose + const B3DRange aPlaneRange(getRange(rCandidate)); + const B3DPoint aPlaneCenter(aPlaneRange.getCenter() - rCenter); + const double fXCenter(fOne - ((atan2(aPlaneCenter.getZ(), aPlaneCenter.getX()) + F_PI) / F_2PI)); + + for(a = 0; a < nPointCount; a++) + { + const B3DVector aVector(aRetval.getB3DPoint(a) - rCenter); + const double fY(fOne - ((atan2(aVector.getY(), aVector.getXZLength()) + F_PI2) / F_PI)); + B2DPoint aTexCoor(aRetval.getTextureCoordinate(a)); + + if(fTools::equalZero(fY)) + { + // point is a north polar point, no useful X-coordinate can be created. + if(bChangeY) + { + aTexCoor.setY(0.0); + + if(bChangeX) + { + bPolarPoints = true; + } + } + } + else if(fTools::equal(fY, fOne)) + { + // point is a south polar point, no useful X-coordinate can be created. Set + // Y-coordinate, though + if(bChangeY) + { + aTexCoor.setY(fOne); + + if(bChangeX) + { + bPolarPoints = true; + } + } + } + else + { + double fX(fOne - ((atan2(aVector.getZ(), aVector.getX()) + F_PI) / F_2PI)); + + // correct cartesian point coordinate dependent from center value + if(fX > fXCenter + 0.5) + { + fX -= fOne; + } + else if(fX < fXCenter - 0.5) + { + fX += fOne; + } + + if(bChangeX) + { + aTexCoor.setX(fX); + } + + if(bChangeY) + { + aTexCoor.setY(fY); + } + } + + aRetval.setTextureCoordinate(a, aTexCoor); + } + + if(bPolarPoints) + { + // correct X-texture coordinates if polar points are contained. Those + // coordinates cannot be correct, so use prev or next X-coordinate + for(a = 0; a < nPointCount; a++) + { + B2DPoint aTexCoor(aRetval.getTextureCoordinate(a)); + + if(fTools::equalZero(aTexCoor.getY()) || fTools::equal(aTexCoor.getY(), fOne)) + { + // get prev, next TexCoor and test for pole + const B2DPoint aPrevTexCoor(aRetval.getTextureCoordinate(a ? a - 1 : nPointCount - 1)); + const B2DPoint aNextTexCoor(aRetval.getTextureCoordinate((a + 1) % nPointCount)); + const bool bPrevPole(fTools::equalZero(aPrevTexCoor.getY()) || fTools::equal(aPrevTexCoor.getY(), fOne)); + const bool bNextPole(fTools::equalZero(aNextTexCoor.getY()) || fTools::equal(aNextTexCoor.getY(), fOne)); + + if(!bPrevPole && !bNextPole) + { + // both no poles, mix them + aTexCoor.setX((aPrevTexCoor.getX() + aNextTexCoor.getX()) / 2.0); + } + else if(!bNextPole) + { + // copy next + aTexCoor.setX(aNextTexCoor.getX()); + } + else + { + // copy prev, even if it's a pole, hopefully it is already corrected + aTexCoor.setX(aPrevTexCoor.getX()); + } + + aRetval.setTextureCoordinate(a, aTexCoor); + } + } + } + } + + return aRetval; + } + + bool isInside(const B3DPolygon& rCandidate, const B3DPoint& rPoint, bool bWithBorder) + { + if(bWithBorder && isPointOnPolygon(rCandidate, rPoint)) + { + return true; + } + else + { + bool bRetval(false); + const B3DVector aPlaneNormal(rCandidate.getNormal()); + + if(!aPlaneNormal.equalZero()) + { + const sal_uInt32 nPointCount(rCandidate.count()); + + if(nPointCount) + { + B3DPoint aCurrentPoint(rCandidate.getB3DPoint(nPointCount - 1)); + const double fAbsX(fabs(aPlaneNormal.getX())); + const double fAbsY(fabs(aPlaneNormal.getY())); + const double fAbsZ(fabs(aPlaneNormal.getZ())); + + if(fAbsX > fAbsY && fAbsX > fAbsZ) + { + // normal points mostly in X-Direction, use YZ-Polygon projection for check + // x -> y, y -> z + for(sal_uInt32 a(0); a < nPointCount; a++) + { + const B3DPoint aPreviousPoint(aCurrentPoint); + aCurrentPoint = rCandidate.getB3DPoint(a); + + // cross-over in Z? + const bool bCompZA(fTools::more(aPreviousPoint.getZ(), rPoint.getZ())); + const bool bCompZB(fTools::more(aCurrentPoint.getZ(), rPoint.getZ())); + + if(bCompZA != bCompZB) + { + // cross-over in Y? + const bool bCompYA(fTools::more(aPreviousPoint.getY(), rPoint.getY())); + const bool bCompYB(fTools::more(aCurrentPoint.getY(), rPoint.getY())); + + if(bCompYA == bCompYB) + { + if(bCompYA) + { + bRetval = !bRetval; + } + } + else + { + const double fCompare( + aCurrentPoint.getY() - (aCurrentPoint.getZ() - rPoint.getZ()) * + (aPreviousPoint.getY() - aCurrentPoint.getY()) / + (aPreviousPoint.getZ() - aCurrentPoint.getZ())); + + if(fTools::more(fCompare, rPoint.getY())) + { + bRetval = !bRetval; + } + } + } + } + } + else if(fAbsY > fAbsX && fAbsY > fAbsZ) + { + // normal points mostly in Y-Direction, use XZ-Polygon projection for check + // x -> x, y -> z + for(sal_uInt32 a(0); a < nPointCount; a++) + { + const B3DPoint aPreviousPoint(aCurrentPoint); + aCurrentPoint = rCandidate.getB3DPoint(a); + + // cross-over in Z? + const bool bCompZA(fTools::more(aPreviousPoint.getZ(), rPoint.getZ())); + const bool bCompZB(fTools::more(aCurrentPoint.getZ(), rPoint.getZ())); + + if(bCompZA != bCompZB) + { + // cross-over in X? + const bool bCompXA(fTools::more(aPreviousPoint.getX(), rPoint.getX())); + const bool bCompXB(fTools::more(aCurrentPoint.getX(), rPoint.getX())); + + if(bCompXA == bCompXB) + { + if(bCompXA) + { + bRetval = !bRetval; + } + } + else + { + const double fCompare( + aCurrentPoint.getX() - (aCurrentPoint.getZ() - rPoint.getZ()) * + (aPreviousPoint.getX() - aCurrentPoint.getX()) / + (aPreviousPoint.getZ() - aCurrentPoint.getZ())); + + if(fTools::more(fCompare, rPoint.getX())) + { + bRetval = !bRetval; + } + } + } + } + } + else + { + // normal points mostly in Z-Direction, use XY-Polygon projection for check + // x -> x, y -> y + for(sal_uInt32 a(0); a < nPointCount; a++) + { + const B3DPoint aPreviousPoint(aCurrentPoint); + aCurrentPoint = rCandidate.getB3DPoint(a); + + // cross-over in Y? + const bool bCompYA(fTools::more(aPreviousPoint.getY(), rPoint.getY())); + const bool bCompYB(fTools::more(aCurrentPoint.getY(), rPoint.getY())); + + if(bCompYA != bCompYB) + { + // cross-over in X? + const bool bCompXA(fTools::more(aPreviousPoint.getX(), rPoint.getX())); + const bool bCompXB(fTools::more(aCurrentPoint.getX(), rPoint.getX())); + + if(bCompXA == bCompXB) + { + if(bCompXA) + { + bRetval = !bRetval; + } + } + else + { + const double fCompare( + aCurrentPoint.getX() - (aCurrentPoint.getY() - rPoint.getY()) * + (aPreviousPoint.getX() - aCurrentPoint.getX()) / + (aPreviousPoint.getY() - aCurrentPoint.getY())); + + if(fTools::more(fCompare, rPoint.getX())) + { + bRetval = !bRetval; + } + } + } + } + } + } + } + + return bRetval; + } + } + + bool isPointOnLine(const B3DPoint& rStart, const B3DPoint& rEnd, const B3DPoint& rCandidate, bool bWithPoints) + { + if(rCandidate.equal(rStart) || rCandidate.equal(rEnd)) + { + // candidate is in epsilon around start or end -> inside + return bWithPoints; + } + else if(rStart.equal(rEnd)) + { + // start and end are equal, but candidate is outside their epsilon -> outside + return false; + } + else + { + const B3DVector aEdgeVector(rEnd - rStart); + const B3DVector aTestVector(rCandidate - rStart); + + if(areParallel(aEdgeVector, aTestVector)) + { + double fParamTestOnCurr(0.0); + + if(aEdgeVector.getX() > aEdgeVector.getY()) + { + if(aEdgeVector.getX() > aEdgeVector.getZ()) + { + // X is biggest + fParamTestOnCurr = aTestVector.getX() / aEdgeVector.getX(); + } + else + { + // Z is biggest + fParamTestOnCurr = aTestVector.getZ() / aEdgeVector.getZ(); + } + } + else + { + if(aEdgeVector.getY() > aEdgeVector.getZ()) + { + // Y is biggest + fParamTestOnCurr = aTestVector.getY() / aEdgeVector.getY(); + } + else + { + // Z is biggest + fParamTestOnCurr = aTestVector.getZ() / aEdgeVector.getZ(); + } + } + + if(fTools::more(fParamTestOnCurr, 0.0) && fTools::less(fParamTestOnCurr, 1.0)) + { + return true; + } + } + + return false; + } + } + + bool isPointOnPolygon(const B3DPolygon& rCandidate, const B3DPoint& rPoint) + { + const sal_uInt32 nPointCount(rCandidate.count()); + + if(nPointCount > 1) + { + const sal_uInt32 nLoopCount(rCandidate.isClosed() ? nPointCount : nPointCount - 1); + B3DPoint aCurrentPoint(rCandidate.getB3DPoint(0)); + + for(sal_uInt32 a(0); a < nLoopCount; a++) + { + const B3DPoint aNextPoint(rCandidate.getB3DPoint((a + 1) % nPointCount)); + + if(isPointOnLine(aCurrentPoint, aNextPoint, rPoint, true/*bWithPoints*/)) + { + return true; + } + + aCurrentPoint = aNextPoint; + } + } + else if(nPointCount) + { + return rPoint.equal(rCandidate.getB3DPoint(0)); + } + + return false; + } + + bool getCutBetweenLineAndPlane(const B3DVector& rPlaneNormal, const B3DPoint& rPlanePoint, const B3DPoint& rEdgeStart, const B3DPoint& rEdgeEnd, double& fCut) + { + if(!rPlaneNormal.equalZero() && !rEdgeStart.equal(rEdgeEnd)) + { + const B3DVector aTestEdge(rEdgeEnd - rEdgeStart); + const double fScalarEdge(rPlaneNormal.scalar(aTestEdge)); + + if(!fTools::equalZero(fScalarEdge)) + { + const B3DVector aCompareEdge(rPlanePoint - rEdgeStart); + const double fScalarCompare(rPlaneNormal.scalar(aCompareEdge)); + + fCut = fScalarCompare / fScalarEdge; + return true; + } + } + + return false; + } + + // snap points of horizontal or vertical edges to discrete values + B3DPolygon snapPointsOfHorizontalOrVerticalEdges(const B3DPolygon& rCandidate) + { + const sal_uInt32 nPointCount(rCandidate.count()); + + if(nPointCount > 1) + { + // Start by copying the source polygon to get a writeable copy. The closed state is + // copied by aRetval's initialisation, too, so no need to copy it in this method + B3DPolygon aRetval(rCandidate); + + // prepare geometry data. Get rounded from original + B3ITuple aPrevTuple(basegfx::fround(rCandidate.getB3DPoint(nPointCount - 1))); + B3DPoint aCurrPoint(rCandidate.getB3DPoint(0)); + B3ITuple aCurrTuple(basegfx::fround(aCurrPoint)); + + // loop over all points. This will also snap the implicit closing edge + // even when not closed, but that's no problem here + for(sal_uInt32 a(0); a < nPointCount; a++) + { + // get next point. Get rounded from original + const bool bLastRun(a + 1 == nPointCount); + const sal_uInt32 nNextIndex(bLastRun ? 0 : a + 1); + const B3DPoint aNextPoint(rCandidate.getB3DPoint(nNextIndex)); + const B3ITuple aNextTuple(basegfx::fround(aNextPoint)); + + // get the states + const bool bPrevVertical(aPrevTuple.getX() == aCurrTuple.getX()); + const bool bNextVertical(aNextTuple.getX() == aCurrTuple.getX()); + const bool bPrevHorizontal(aPrevTuple.getY() == aCurrTuple.getY()); + const bool bNextHorizontal(aNextTuple.getY() == aCurrTuple.getY()); + const bool bSnapX(bPrevVertical || bNextVertical); + const bool bSnapY(bPrevHorizontal || bNextHorizontal); + + if(bSnapX || bSnapY) + { + const B3DPoint aSnappedPoint( + bSnapX ? aCurrTuple.getX() : aCurrPoint.getX(), + bSnapY ? aCurrTuple.getY() : aCurrPoint.getY(), + aCurrPoint.getZ()); + + aRetval.setB3DPoint(a, aSnappedPoint); + } + + // prepare next point + if(!bLastRun) + { + aPrevTuple = aCurrTuple; + aCurrPoint = aNextPoint; + aCurrTuple = aNextTuple; + } + } + + return aRetval; + } + else + { + return rCandidate; + } + } + +} // end of namespace + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |