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Diffstat (limited to 'svx/source/xoutdev/_xpoly.cxx')
| -rw-r--r-- | svx/source/xoutdev/_xpoly.cxx | 948 |
1 files changed, 948 insertions, 0 deletions
diff --git a/svx/source/xoutdev/_xpoly.cxx b/svx/source/xoutdev/_xpoly.cxx new file mode 100644 index 000000000..abb536aed --- /dev/null +++ b/svx/source/xoutdev/_xpoly.cxx @@ -0,0 +1,948 @@ +/* -*- 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 <sal/config.h> + +#include <algorithm> + +#include <tools/debug.hxx> +#include <tools/poly.hxx> +#include <tools/helpers.hxx> +#include <tools/gen.hxx> + +#include <svx/xpoly.hxx> +#include <xpolyimp.hxx> +#include <basegfx/polygon/b2dpolygon.hxx> +#include <basegfx/polygon/b2dpolygontools.hxx> +#include <basegfx/range/b2drange.hxx> + + +ImpXPolygon::ImpXPolygon(sal_uInt16 nInitSize, sal_uInt16 _nResize) + : pOldPointAry(nullptr) + , bDeleteOldPoints(false) + , nSize(0) + , nResize(_nResize) + , nPoints(0) +{ + Resize(nInitSize); +} + +ImpXPolygon::ImpXPolygon( const ImpXPolygon& rImpXPoly ) + : pOldPointAry(nullptr) + , bDeleteOldPoints(false) + , nSize(0) + , nResize(rImpXPoly.nResize) + , nPoints(0) +{ + rImpXPoly.CheckPointDelete(); + + Resize( rImpXPoly.nSize ); + + // copy + nPoints = rImpXPoly.nPoints; + memcpy( pPointAry.get(), rImpXPoly.pPointAry.get(), nSize*sizeof( Point ) ); + memcpy( pFlagAry.get(), rImpXPoly.pFlagAry.get(), nSize ); +} + +ImpXPolygon::~ImpXPolygon() +{ + pPointAry.reset(); + if ( bDeleteOldPoints ) + { + delete[] pOldPointAry; + pOldPointAry = nullptr; + } +} + +bool ImpXPolygon::operator==(const ImpXPolygon& rImpXPoly) const +{ + return nPoints==rImpXPoly.nPoints && + (nPoints==0 || + (memcmp(pPointAry.get(), rImpXPoly.pPointAry.get(), nPoints*sizeof(Point))==0 && + memcmp(pFlagAry.get(), rImpXPoly.pFlagAry.get(), nPoints)==0)); +} + +/** Change polygon size + * + * @param nNewSize the new size of the polygon + * @param bDeletePoints if FALSE, do not delete the point array directly but + * wait for the next call before doing so. This prevents + * errors with XPoly[n] = XPoly[0] where a resize might + * destroy the right side point array too early. + */ +void ImpXPolygon::Resize( sal_uInt16 nNewSize, bool bDeletePoints ) +{ + if( nNewSize == nSize ) + return; + + PolyFlags* pOldFlagAry = pFlagAry.release(); + sal_uInt16 nOldSize = nSize; + + CheckPointDelete(); + pOldPointAry = pPointAry.release(); + + // Round the new size to a multiple of nResize, if + // the object was not newly created (nSize != 0) + if ( nSize != 0 && nNewSize > nSize ) + { + DBG_ASSERT(nResize, "Trying to resize but nResize = 0 !"); + nNewSize = nSize + ((nNewSize-nSize-1) / nResize + 1) * nResize; + } + // create point array + nSize = nNewSize; + pPointAry.reset( new Point[ nSize ] ); + + // create flag array + pFlagAry.reset( new PolyFlags[ nSize ] ); + memset( pFlagAry.get(), 0, nSize ); + + // copy if needed + if( nOldSize ) + { + if( nOldSize < nSize ) + { + memcpy( pPointAry.get(), pOldPointAry, nOldSize*sizeof( Point ) ); + memcpy( pFlagAry.get(), pOldFlagAry, nOldSize ); + } + else + { + memcpy( pPointAry.get(), pOldPointAry, nSize*sizeof( Point ) ); + memcpy( pFlagAry.get(), pOldFlagAry, nSize ); + + // adjust number of valid points + if( nPoints > nSize ) + nPoints = nSize; + } + if ( bDeletePoints ) + { + delete[] pOldPointAry; + pOldPointAry = nullptr; + } + else + bDeleteOldPoints = true; + delete[] pOldFlagAry; + } +} + +void ImpXPolygon::InsertSpace( sal_uInt16 nPos, sal_uInt16 nCount ) +{ + CheckPointDelete(); + + if ( nPos > nPoints ) + nPos = nPoints; + + // if the polygon is too small then enlarge it + if( (nPoints + nCount) > nSize ) + Resize( nPoints + nCount ); + + // If the insert is not at the last position, move everything after backwards + if( nPos < nPoints ) + { + sal_uInt16 nMove = nPoints - nPos; + memmove( &pPointAry[nPos+nCount], &pPointAry[nPos], + nMove * sizeof(Point) ); + memmove( &pFlagAry[nPos+nCount], &pFlagAry[nPos], nMove ); + } + std::fill(pPointAry.get() + nPos, pPointAry.get() + nPos + nCount, Point()); + memset( &pFlagAry [nPos], 0, nCount ); + + nPoints = nPoints + nCount; +} + +void ImpXPolygon::Remove( sal_uInt16 nPos, sal_uInt16 nCount ) +{ + CheckPointDelete(); + + if( (nPos + nCount) <= nPoints ) + { + sal_uInt16 nMove = nPoints - nPos - nCount; + + if( nMove ) + { + memmove( &pPointAry[nPos], &pPointAry[nPos+nCount], + nMove * sizeof(Point) ); + memmove( &pFlagAry[nPos], &pFlagAry[nPos+nCount], nMove ); + } + std::fill(pPointAry.get() + (nPoints - nCount), pPointAry.get() + nPoints, Point()); + memset( &pFlagAry [nPoints - nCount], 0, nCount ); + nPoints = nPoints - nCount; + } +} + +void ImpXPolygon::CheckPointDelete() const +{ + if ( bDeleteOldPoints ) + { + delete[] pOldPointAry; + const_cast< ImpXPolygon* >(this)->pOldPointAry = nullptr; + const_cast< ImpXPolygon* >(this)->bDeleteOldPoints = false; + } +} + +XPolygon::XPolygon( sal_uInt16 nSize ) + : pImpXPolygon( ImpXPolygon( nSize, 16 ) ) +{ +} + +XPolygon::XPolygon( const XPolygon& ) = default; + +XPolygon::XPolygon( XPolygon&& ) = default; + +/// create a XPolygon out of a standard polygon +XPolygon::XPolygon( const tools::Polygon& rPoly ) + : pImpXPolygon( rPoly.GetSize() ) +{ + sal_uInt16 nSize = rPoly.GetSize(); + pImpXPolygon->nPoints = nSize; + + for( sal_uInt16 i = 0; i < nSize; i++ ) + { + pImpXPolygon->pPointAry[i] = rPoly[i]; + pImpXPolygon->pFlagAry[i] = rPoly.GetFlags( i ); + } +} + +/// create a rectangle (also with rounded corners) as a Bézier polygon +XPolygon::XPolygon(const tools::Rectangle& rRect, long nRx, long nRy) + : pImpXPolygon( 17 ) +{ + long nWh = (rRect.GetWidth() - 1) / 2; + long nHh = (rRect.GetHeight() - 1) / 2; + + if ( nRx > nWh ) nRx = nWh; + if ( nRy > nHh ) nRy = nHh; + + // negate Rx => circle clockwise + nRx = -nRx; + + // factor for control points of the Bézier curve: 8/3 * (sin(45g) - 0.5) + long nXHdl = static_cast<long>(0.552284749 * nRx); + long nYHdl = static_cast<long>(0.552284749 * nRy); + sal_uInt16 nPos = 0; + + if ( nRx && nRy ) + { + Point aCenter; + + for (sal_uInt16 nQuad = 0; nQuad < 4; nQuad++) + { + switch ( nQuad ) + { + case 0: aCenter = rRect.TopLeft(); + aCenter.AdjustX( -nRx ); + aCenter.AdjustY(nRy ); + break; + case 1: aCenter = rRect.TopRight(); + aCenter.AdjustX(nRx ); + aCenter.AdjustY(nRy ); + break; + case 2: aCenter = rRect.BottomRight(); + aCenter.AdjustX(nRx ); + aCenter.AdjustY( -nRy ); + break; + case 3: aCenter = rRect.BottomLeft(); + aCenter.AdjustX( -nRx ); + aCenter.AdjustY( -nRy ); + break; + } + GenBezArc(aCenter, nRx, nRy, nXHdl, nYHdl, 0, 900, nQuad, nPos); + pImpXPolygon->pFlagAry[nPos ] = PolyFlags::Smooth; + pImpXPolygon->pFlagAry[nPos+3] = PolyFlags::Smooth; + nPos += 4; + } + } + else + { + pImpXPolygon->pPointAry[nPos++] = rRect.TopLeft(); + pImpXPolygon->pPointAry[nPos++] = rRect.TopRight(); + pImpXPolygon->pPointAry[nPos++] = rRect.BottomRight(); + pImpXPolygon->pPointAry[nPos++] = rRect.BottomLeft(); + } + pImpXPolygon->pPointAry[nPos] = pImpXPolygon->pPointAry[0]; + pImpXPolygon->nPoints = nPos + 1; +} + +/// create an ellipse (curve) as Bézier polygon +XPolygon::XPolygon(const Point& rCenter, long nRx, long nRy, + sal_uInt16 nStartAngle, sal_uInt16 nEndAngle, bool bClose) + : pImpXPolygon( 17 ) +{ + nStartAngle %= 3600; + if ( nEndAngle > 3600 ) nEndAngle %= 3600; + bool bFull = (nStartAngle == 0 && nEndAngle == 3600); + + // factor for control points of the Bézier curve: 8/3 * (sin(45g) - 0.5) + long nXHdl = static_cast<long>(0.552284749 * nRx); + long nYHdl = static_cast<long>(0.552284749 * nRy); + sal_uInt16 nPos = 0; + bool bLoopEnd = false; + + do + { + sal_uInt16 nA1, nA2; + sal_uInt16 nQuad = nStartAngle / 900; + if ( nQuad == 4 ) nQuad = 0; + bLoopEnd = CheckAngles(nStartAngle, nEndAngle, nA1, nA2); + GenBezArc(rCenter, nRx, nRy, nXHdl, nYHdl, nA1, nA2, nQuad, nPos); + nPos += 3; + if ( !bLoopEnd ) + pImpXPolygon->pFlagAry[nPos] = PolyFlags::Smooth; + + } while ( !bLoopEnd ); + + // if not a full circle then connect edges with center point if necessary + if ( !bFull && bClose ) + pImpXPolygon->pPointAry[++nPos] = rCenter; + + if ( bFull ) + { + pImpXPolygon->pFlagAry[0 ] = PolyFlags::Smooth; + pImpXPolygon->pFlagAry[nPos] = PolyFlags::Smooth; + } + pImpXPolygon->nPoints = nPos + 1; +} + +XPolygon::~XPolygon() = default; + +void XPolygon::SetPointCount( sal_uInt16 nPoints ) +{ + pImpXPolygon->CheckPointDelete(); + + if( pImpXPolygon->nSize < nPoints ) + pImpXPolygon->Resize( nPoints ); + + if ( nPoints < pImpXPolygon->nPoints ) + { + sal_uInt16 nSize = pImpXPolygon->nPoints - nPoints; + std::fill( + pImpXPolygon->pPointAry.get() + nPoints, pImpXPolygon->pPointAry.get() + nPoints + nSize, Point()); + memset( &pImpXPolygon->pFlagAry [nPoints], 0, nSize ); + } + pImpXPolygon->nPoints = nPoints; +} + +sal_uInt16 XPolygon::GetSize() const +{ + pImpXPolygon->CheckPointDelete(); + return pImpXPolygon->nSize; +} + +sal_uInt16 XPolygon::GetPointCount() const +{ + pImpXPolygon->CheckPointDelete(); + return pImpXPolygon->nPoints; +} + +void XPolygon::Insert( sal_uInt16 nPos, const Point& rPt, PolyFlags eFlags ) +{ + if (nPos>pImpXPolygon->nPoints) nPos=pImpXPolygon->nPoints; + pImpXPolygon->InsertSpace( nPos, 1 ); + pImpXPolygon->pPointAry[nPos] = rPt; + pImpXPolygon->pFlagAry[nPos] = eFlags; +} + +void XPolygon::Insert( sal_uInt16 nPos, const XPolygon& rXPoly ) +{ + if (nPos>pImpXPolygon->nPoints) nPos=pImpXPolygon->nPoints; + + sal_uInt16 nPoints = rXPoly.GetPointCount(); + + pImpXPolygon->InsertSpace( nPos, nPoints ); + + memcpy( &(pImpXPolygon->pPointAry[nPos]), + rXPoly.pImpXPolygon->pPointAry.get(), + nPoints*sizeof( Point ) ); + memcpy( &(pImpXPolygon->pFlagAry[nPos]), + rXPoly.pImpXPolygon->pFlagAry.get(), + nPoints ); +} + +void XPolygon::Remove( sal_uInt16 nPos, sal_uInt16 nCount ) +{ + pImpXPolygon->Remove( nPos, nCount ); +} + +void XPolygon::Move( long nHorzMove, long nVertMove ) +{ + if ( !nHorzMove && !nVertMove ) + return; + + // move points + sal_uInt16 nCount = pImpXPolygon->nPoints; + for ( sal_uInt16 i = 0; i < nCount; i++ ) + { + Point* pPt = &(pImpXPolygon->pPointAry[i]); + pPt->AdjustX( nHorzMove ); + pPt->AdjustY( nVertMove ); + } +} + +tools::Rectangle XPolygon::GetBoundRect() const +{ + pImpXPolygon->CheckPointDelete(); + tools::Rectangle aRetval; + + if(pImpXPolygon->nPoints) + { + // #i37709# + // For historical reasons the control points are not part of the + // BoundRect. This makes it necessary to subdivide the polygon to + // get a relatively correct BoundRect. Numerically, this is not + // correct and never was. + + const basegfx::B2DRange aPolygonRange(basegfx::utils::getRange(getB2DPolygon())); + aRetval = tools::Rectangle( + FRound(aPolygonRange.getMinX()), FRound(aPolygonRange.getMinY()), + FRound(aPolygonRange.getMaxX()), FRound(aPolygonRange.getMaxY())); + } + + return aRetval; +} + +const Point& XPolygon::operator[]( sal_uInt16 nPos ) const +{ + DBG_ASSERT(nPos < pImpXPolygon->nPoints, "Invalid index at const array access to XPolygon"); + + pImpXPolygon->CheckPointDelete(); + return pImpXPolygon->pPointAry[nPos]; +} + +Point& XPolygon::operator[]( sal_uInt16 nPos ) +{ + pImpXPolygon->CheckPointDelete(); + + if( nPos >= pImpXPolygon->nSize ) + { + DBG_ASSERT(pImpXPolygon->nResize, "Invalid index at array access to XPolygon"); + pImpXPolygon->Resize(nPos + 1, false); + } + if( nPos >= pImpXPolygon->nPoints ) + pImpXPolygon->nPoints = nPos + 1; + + return pImpXPolygon->pPointAry[nPos]; +} + +XPolygon& XPolygon::operator=( const XPolygon& ) = default; + +XPolygon& XPolygon::operator=( XPolygon&& ) = default; + +bool XPolygon::operator==( const XPolygon& rXPoly ) const +{ + pImpXPolygon->CheckPointDelete(); + return rXPoly.pImpXPolygon == pImpXPolygon; +} + +/// get the flags for the point at the given position +PolyFlags XPolygon::GetFlags( sal_uInt16 nPos ) const +{ + pImpXPolygon->CheckPointDelete(); + return pImpXPolygon->pFlagAry[nPos]; +} + +/// set the flags for the point at the given position +void XPolygon::SetFlags( sal_uInt16 nPos, PolyFlags eFlags ) +{ + pImpXPolygon->CheckPointDelete(); + pImpXPolygon->pFlagAry[nPos] = eFlags; +} + +/// short path to read the CONTROL flag directly (TODO: better explain what the sense behind this flag is!) +bool XPolygon::IsControl(sal_uInt16 nPos) const +{ + return pImpXPolygon->pFlagAry[nPos] == PolyFlags::Control; +} + +/// short path to read the SMOOTH and SYMMTR flag directly (TODO: better explain what the sense behind these flags is!) +bool XPolygon::IsSmooth(sal_uInt16 nPos) const +{ + PolyFlags eFlag = pImpXPolygon->pFlagAry[nPos]; + return ( eFlag == PolyFlags::Smooth || eFlag == PolyFlags::Symmetric ); +} + +/** calculate the euclidean distance between two points + * + * @param nP1 The first point + * @param nP2 The second point + */ +double XPolygon::CalcDistance(sal_uInt16 nP1, sal_uInt16 nP2) +{ + const Point& rP1 = pImpXPolygon->pPointAry[nP1]; + const Point& rP2 = pImpXPolygon->pPointAry[nP2]; + double fDx = rP2.X() - rP1.X(); + double fDy = rP2.Y() - rP1.Y(); + return sqrt(fDx * fDx + fDy * fDy); +} + +void XPolygon::SubdivideBezier(sal_uInt16 nPos, bool bCalcFirst, double fT) +{ + Point* pPoints = pImpXPolygon->pPointAry.get(); + double fT2 = fT * fT; + double fT3 = fT * fT2; + double fU = 1.0 - fT; + double fU2 = fU * fU; + double fU3 = fU * fU2; + sal_uInt16 nIdx = nPos; + short nPosInc, nIdxInc; + + if ( bCalcFirst ) + { + nPos += 3; + nPosInc = -1; + nIdxInc = 0; + } + else + { + nPosInc = 1; + nIdxInc = 1; + } + pPoints[nPos].setX( static_cast<long>(fU3 * pPoints[nIdx ].X() + + fT * fU2 * pPoints[nIdx+1].X() * 3 + + fT2 * fU * pPoints[nIdx+2].X() * 3 + + fT3 * pPoints[nIdx+3].X()) ); + pPoints[nPos].setY( static_cast<long>(fU3 * pPoints[nIdx ].Y() + + fT * fU2 * pPoints[nIdx+1].Y() * 3 + + fT2 * fU * pPoints[nIdx+2].Y() * 3 + + fT3 * pPoints[nIdx+3].Y()) ); + nPos = nPos + nPosInc; + nIdx = nIdx + nIdxInc; + pPoints[nPos].setX( static_cast<long>(fU2 * pPoints[nIdx ].X() + + fT * fU * pPoints[nIdx+1].X() * 2 + + fT2 * pPoints[nIdx+2].X()) ); + pPoints[nPos].setY( static_cast<long>(fU2 * pPoints[nIdx ].Y() + + fT * fU * pPoints[nIdx+1].Y() * 2 + + fT2 * pPoints[nIdx+2].Y()) ); + nPos = nPos + nPosInc; + nIdx = nIdx + nIdxInc; + pPoints[nPos].setX( static_cast<long>(fU * pPoints[nIdx ].X() + + fT * pPoints[nIdx+1].X()) ); + pPoints[nPos].setY( static_cast<long>(fU * pPoints[nIdx ].Y() + + fT * pPoints[nIdx+1].Y()) ); +} + +/// Generate a Bézier arc +void XPolygon::GenBezArc(const Point& rCenter, long nRx, long nRy, + long nXHdl, long nYHdl, sal_uInt16 nStart, sal_uInt16 nEnd, + sal_uInt16 nQuad, sal_uInt16 nFirst) +{ + Point* pPoints = pImpXPolygon->pPointAry.get(); + pPoints[nFirst ] = rCenter; + pPoints[nFirst+3] = rCenter; + + if ( nQuad == 1 || nQuad == 2 ) + { + nRx = -nRx; nXHdl = -nXHdl; + } + if ( nQuad == 0 || nQuad == 1 ) + { + nRy = -nRy; nYHdl = -nYHdl; + } + + if ( nQuad == 0 || nQuad == 2 ) + { + pPoints[nFirst].AdjustX( nRx ); + pPoints[nFirst+3].AdjustY( nRy ); + } + else + { + pPoints[nFirst].AdjustY( nRy ); + pPoints[nFirst+3].AdjustX( nRx ); + } + pPoints[nFirst+1] = pPoints[nFirst]; + pPoints[nFirst+2] = pPoints[nFirst+3]; + + if ( nQuad == 0 || nQuad == 2 ) + { + pPoints[nFirst+1].AdjustY( nYHdl ); + pPoints[nFirst+2].AdjustX( nXHdl ); + } + else + { + pPoints[nFirst+1].AdjustX( nXHdl ); + pPoints[nFirst+2].AdjustY( nYHdl ); + } + if ( nStart > 0 ) + SubdivideBezier(nFirst, false, static_cast<double>(nStart) / 900); + if ( nEnd < 900 ) + SubdivideBezier(nFirst, true, static_cast<double>(nEnd-nStart) / (900-nStart)); + SetFlags(nFirst+1, PolyFlags::Control); + SetFlags(nFirst+2, PolyFlags::Control); +} + +bool XPolygon::CheckAngles(sal_uInt16& nStart, sal_uInt16 nEnd, sal_uInt16& nA1, sal_uInt16& nA2) +{ + if ( nStart == 3600 ) nStart = 0; + if ( nEnd == 0 ) nEnd = 3600; + sal_uInt16 nStPrev = nStart; + sal_uInt16 nMax = (nStart / 900 + 1) * 900; + sal_uInt16 nMin = nMax - 900; + + if ( nEnd >= nMax || nEnd <= nStart ) nA2 = 900; + else nA2 = nEnd - nMin; + nA1 = nStart - nMin; + nStart = nMax; + + // returns true when the last segment was calculated + return (nStPrev < nEnd && nStart >= nEnd); +} + +/** Calculate a smooth transition to connect two Bézier curves + * + * This is done by projecting the corresponding point onto a line between + * two other points. + * + * @param nCenter The point at the end or beginning of the curve. + * If nCenter is at the end of the polygon the point is moved + * to the opposite side. + * @param nDrag The moved point that specifies the relocation. + * @param nPnt The point to modify. + */ +void XPolygon::CalcSmoothJoin(sal_uInt16 nCenter, sal_uInt16 nDrag, sal_uInt16 nPnt) +{ + // If nPoint is no control point, i.e. cannot be moved, then + // move nDrag instead on the line between nCenter and nPnt + if ( !IsControl(nPnt) ) + { + sal_uInt16 nTmp = nDrag; + nDrag = nPnt; + nPnt = nTmp; + } + Point* pPoints = pImpXPolygon->pPointAry.get(); + Point aDiff = pPoints[nDrag] - pPoints[nCenter]; + double fDiv = CalcDistance(nCenter, nDrag); + + if ( fDiv ) + { + double fRatio = CalcDistance(nCenter, nPnt) / fDiv; + // keep the length if SMOOTH + if ( GetFlags(nCenter) == PolyFlags::Smooth || !IsControl(nDrag) ) + { + aDiff.setX( static_cast<long>(fRatio * aDiff.X()) ); + aDiff.setY( static_cast<long>(fRatio * aDiff.Y()) ); + } + pPoints[nPnt] = pPoints[nCenter] - aDiff; + } +} + +/** Calculate tangent between two Bézier curves + * + * @param nCenter start or end point of the curves + * @param nPrev previous reference point + * @param nNext next reference point + */ +void XPolygon::CalcTangent(sal_uInt16 nCenter, sal_uInt16 nPrev, sal_uInt16 nNext) +{ + double fAbsLen = CalcDistance(nNext, nPrev); + + if ( !fAbsLen ) + return; + + const Point& rCenter = pImpXPolygon->pPointAry[nCenter]; + Point& rNext = pImpXPolygon->pPointAry[nNext]; + Point& rPrev = pImpXPolygon->pPointAry[nPrev]; + Point aDiff = rNext - rPrev; + double fNextLen = CalcDistance(nCenter, nNext) / fAbsLen; + double fPrevLen = CalcDistance(nCenter, nPrev) / fAbsLen; + + // same length for both sides if SYMMTR + if ( GetFlags(nCenter) == PolyFlags::Symmetric ) + { + fPrevLen = (fNextLen + fPrevLen) / 2; + fNextLen = fPrevLen; + } + rNext.setX( rCenter.X() + static_cast<long>(fNextLen * aDiff.X()) ); + rNext.setY( rCenter.Y() + static_cast<long>(fNextLen * aDiff.Y()) ); + rPrev.setX( rCenter.X() - static_cast<long>(fPrevLen * aDiff.X()) ); + rPrev.setY( rCenter.Y() - static_cast<long>(fPrevLen * aDiff.Y()) ); +} + +/// convert four polygon points into a Bézier curve +void XPolygon::PointsToBezier(sal_uInt16 nFirst) +{ + double nFullLength, nPart1Length, nPart2Length; + double fX0, fY0, fX1, fY1, fX2, fY2, fX3, fY3; + double fTx1, fTx2, fTy1, fTy2; + double fT1, fU1, fT2, fU2, fV; + Point* pPoints = pImpXPolygon->pPointAry.get(); + + if ( nFirst > pImpXPolygon->nPoints - 4 || IsControl(nFirst) || + IsControl(nFirst+1) || IsControl(nFirst+2) || IsControl(nFirst+3) ) + return; + + fTx1 = pPoints[nFirst+1].X(); + fTy1 = pPoints[nFirst+1].Y(); + fTx2 = pPoints[nFirst+2].X(); + fTy2 = pPoints[nFirst+2].Y(); + fX0 = pPoints[nFirst ].X(); + fY0 = pPoints[nFirst ].Y(); + fX3 = pPoints[nFirst+3].X(); + fY3 = pPoints[nFirst+3].Y(); + + nPart1Length = CalcDistance(nFirst, nFirst+1); + nPart2Length = nPart1Length + CalcDistance(nFirst+1, nFirst+2); + nFullLength = nPart2Length + CalcDistance(nFirst+2, nFirst+3); + if ( nFullLength < 20 ) + return; + + if ( nPart2Length == nFullLength ) + nPart2Length -= 1; + if ( nPart1Length == nFullLength ) + nPart1Length = nPart2Length - 1; + if ( nPart1Length <= 0 ) + nPart1Length = 1; + if ( nPart2Length <= 0 || nPart2Length == nPart1Length ) + nPart2Length = nPart1Length + 1; + + fT1 = nPart1Length / nFullLength; + fU1 = 1.0 - fT1; + fT2 = nPart2Length / nFullLength; + fU2 = 1.0 - fT2; + fV = 3 * (1.0 - (fT1 * fU2) / (fT2 * fU1)); + + fX1 = fTx1 / (fT1 * fU1 * fU1) - fTx2 * fT1 / (fT2 * fT2 * fU1 * fU2); + fX1 /= fV; + fX1 -= fX0 * ( fU1 / fT1 + fU2 / fT2) / 3; + fX1 += fX3 * ( fT1 * fT2 / (fU1 * fU2)) / 3; + + fY1 = fTy1 / (fT1 * fU1 * fU1) - fTy2 * fT1 / (fT2 * fT2 * fU1 * fU2); + fY1 /= fV; + fY1 -= fY0 * ( fU1 / fT1 + fU2 / fT2) / 3; + fY1 += fY3 * ( fT1 * fT2 / (fU1 * fU2)) / 3; + + fX2 = fTx2 / (fT2 * fT2 * fU2 * 3) - fX0 * fU2 * fU2 / ( fT2 * fT2 * 3); + fX2 -= fX1 * fU2 / fT2; + fX2 -= fX3 * fT2 / (fU2 * 3); + + fY2 = fTy2 / (fT2 * fT2 * fU2 * 3) - fY0 * fU2 * fU2 / ( fT2 * fT2 * 3); + fY2 -= fY1 * fU2 / fT2; + fY2 -= fY3 * fT2 / (fU2 * 3); + + pPoints[nFirst+1] = Point(static_cast<long>(fX1), static_cast<long>(fY1)); + pPoints[nFirst+2] = Point(static_cast<long>(fX2), static_cast<long>(fY2)); + SetFlags(nFirst+1, PolyFlags::Control); + SetFlags(nFirst+2, PolyFlags::Control); +} + +/// scale in X- and/or Y-direction +void XPolygon::Scale(double fSx, double fSy) +{ + pImpXPolygon->CheckPointDelete(); + + sal_uInt16 nPntCnt = pImpXPolygon->nPoints; + + for (sal_uInt16 i = 0; i < nPntCnt; i++) + { + Point& rPnt = pImpXPolygon->pPointAry[i]; + rPnt.setX( static_cast<long>(fSx * rPnt.X()) ); + rPnt.setY( static_cast<long>(fSy * rPnt.Y()) ); + } +} + +/** + * Distort a polygon by scaling its coordinates relative to a reference + * rectangle into an arbitrary rectangle. + * + * Mapping between polygon corners and reference rectangle: + * 0: top left 0----1 + * 1: top right | | + * 2: bottom right 3----2 + * 3: bottom left + */ +void XPolygon::Distort(const tools::Rectangle& rRefRect, + const XPolygon& rDistortedRect) +{ + pImpXPolygon->CheckPointDelete(); + + long Xr, Wr; + long Yr, Hr; + + Xr = rRefRect.Left(); + Yr = rRefRect.Top(); + Wr = rRefRect.GetWidth(); + Hr = rRefRect.GetHeight(); + + if ( !Wr || !Hr ) + return; + + long X1, X2, X3, X4; + long Y1, Y2, Y3, Y4; + DBG_ASSERT(rDistortedRect.pImpXPolygon->nPoints >= 4, + "Distort: rectangle too small"); + + X1 = rDistortedRect[0].X(); + Y1 = rDistortedRect[0].Y(); + X2 = rDistortedRect[1].X(); + Y2 = rDistortedRect[1].Y(); + X3 = rDistortedRect[3].X(); + Y3 = rDistortedRect[3].Y(); + X4 = rDistortedRect[2].X(); + Y4 = rDistortedRect[2].Y(); + + sal_uInt16 nPntCnt = pImpXPolygon->nPoints; + + for (sal_uInt16 i = 0; i < nPntCnt; i++) + { + double fTx, fTy, fUx, fUy; + Point& rPnt = pImpXPolygon->pPointAry[i]; + + fTx = static_cast<double>(rPnt.X() - Xr) / Wr; + fTy = static_cast<double>(rPnt.Y() - Yr) / Hr; + fUx = 1.0 - fTx; + fUy = 1.0 - fTy; + + rPnt.setX( static_cast<long>( fUy * (fUx * X1 + fTx * X2) + + fTy * (fUx * X3 + fTx * X4) ) ); + rPnt.setY( static_cast<long>( fUx * (fUy * Y1 + fTy * Y3) + + fTx * (fUy * Y2 + fTy * Y4) ) ); + } +} + +basegfx::B2DPolygon XPolygon::getB2DPolygon() const +{ + // #i74631# use tools Polygon class for conversion to not have the code doubled + // here. This needs one more conversion but avoids different convertors in + // the long run + const tools::Polygon aSource(GetPointCount(), pImpXPolygon->pPointAry.get(), pImpXPolygon->pFlagAry.get()); + + return aSource.getB2DPolygon(); +} + +XPolygon::XPolygon(const basegfx::B2DPolygon& rPolygon) + : pImpXPolygon( tools::Polygon( rPolygon ).GetSize() ) +{ + // #i74631# use tools Polygon class for conversion to not have the code doubled + // here. This needs one more conversion but avoids different convertors in + // the long run + + const tools::Polygon aSource(rPolygon); + sal_uInt16 nSize = aSource.GetSize(); + pImpXPolygon->nPoints = nSize; + + for( sal_uInt16 i = 0; i < nSize; i++ ) + { + pImpXPolygon->pPointAry[i] = aSource[i]; + pImpXPolygon->pFlagAry[i] = aSource.GetFlags( i ); + } +} + +// XPolyPolygon +XPolyPolygon::XPolyPolygon() = default; + +XPolyPolygon::XPolyPolygon( const XPolyPolygon& ) = default; + +XPolyPolygon::XPolyPolygon( XPolyPolygon&& ) = default; + +XPolyPolygon::XPolyPolygon(const basegfx::B2DPolyPolygon& rPolyPolygon) + : pImpXPolyPolygon() +{ + for(auto const& rCandidate : rPolyPolygon) + { + Insert(XPolygon(rCandidate)); + } +} + +XPolyPolygon::~XPolyPolygon() = default; + +void XPolyPolygon::Insert( XPolygon&& rXPoly ) +{ + pImpXPolyPolygon->aXPolyList.emplace_back( std::move(rXPoly) ); +} + +/// insert all XPolygons of a XPolyPolygon +void XPolyPolygon::Insert( const XPolyPolygon& rXPolyPoly ) +{ + for ( size_t i = 0; i < rXPolyPoly.Count(); i++) + { + pImpXPolyPolygon->aXPolyList.emplace_back( rXPolyPoly[i] ); + } +} + +void XPolyPolygon::Remove( sal_uInt16 nPos ) +{ + pImpXPolyPolygon->aXPolyList.erase( pImpXPolyPolygon->aXPolyList.begin() + nPos ); +} + +const XPolygon& XPolyPolygon::GetObject( sal_uInt16 nPos ) const +{ + return pImpXPolyPolygon->aXPolyList[ nPos ]; +} + +void XPolyPolygon::Clear() +{ + pImpXPolyPolygon->aXPolyList.clear(); +} + +sal_uInt16 XPolyPolygon::Count() const +{ + return static_cast<sal_uInt16>(pImpXPolyPolygon->aXPolyList.size()); +} + +tools::Rectangle XPolyPolygon::GetBoundRect() const +{ + size_t nXPoly = pImpXPolyPolygon->aXPolyList.size(); + tools::Rectangle aRect; + + for ( size_t n = 0; n < nXPoly; n++ ) + { + XPolygon const & rXPoly = pImpXPolyPolygon->aXPolyList[ n ]; + aRect.Union( rXPoly.GetBoundRect() ); + } + + return aRect; +} + +XPolygon& XPolyPolygon::operator[]( sal_uInt16 nPos ) +{ + return pImpXPolyPolygon->aXPolyList[ nPos ]; +} + +XPolyPolygon& XPolyPolygon::operator=( const XPolyPolygon& ) = default; + +XPolyPolygon& XPolyPolygon::operator=( XPolyPolygon&& ) = default; + +/** + * Distort a polygon by scaling its coordinates relative to a reference + * rectangle into an arbitrary rectangle. + * + * Mapping between polygon corners and reference rectangle: + * 0: top left 0----1 + * 1: top right | | + * 2: bottom right 3----2 + * 3: bottom left + */ +void XPolyPolygon::Distort(const tools::Rectangle& rRefRect, + const XPolygon& rDistortedRect) +{ + for (size_t i = 0; i < Count(); i++) + pImpXPolyPolygon->aXPolyList[ i ].Distort(rRefRect, rDistortedRect); +} + +basegfx::B2DPolyPolygon XPolyPolygon::getB2DPolyPolygon() const +{ + basegfx::B2DPolyPolygon aRetval; + + for(sal_uInt16 a(0); a < Count(); a++) + { + const XPolygon& rPoly = (*this)[a]; + aRetval.append(rPoly.getB2DPolygon()); + } + + return aRetval; +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |