mirror of
https://github.com/JakubMelka/PDF4QT.git
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111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
// Copyright (C) 2020 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFSNAPPER_H
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#define PDFSNAPPER_H
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#include "pdfglobal.h"
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#include <array>
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class QPainter;
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namespace pdf
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{
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class PDFPrecompiledPage;
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enum class SnapType
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{
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Invalid,
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PageCorner, ///< Corner of the page media box
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ImageCorner, ///< Corner of image
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PageCenter, ///< Center of page media box
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ImageCenter, ///< Center of image
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LineCenter, ///< Center of line
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GeneratedLineProjection ///< Generated point to line projections
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};
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/// Contain informations for snap points in the pdf page. Snap points
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/// can be for example image centers, rectangle corners, line start/end
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/// points, page boundary boxes etc. All coordinates are in page coordinates.
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class PDFSnapInfo
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{
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public:
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explicit inline PDFSnapInfo() = default;
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struct SnapPoint
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{
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explicit inline constexpr SnapPoint() = default;
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explicit inline constexpr SnapPoint(SnapType type, QPointF point) :
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type(type),
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point(point)
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{
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}
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SnapType type = SnapType::Invalid;
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QPointF point;
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};
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/// Adds page media box. Media box must be in page coordinates.
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/// \param mediaBox Media box
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void addPageMediaBox(const QRectF& mediaBox);
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/// Adds image box. Because it is not guaranteed, that it will be rectangle, five
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/// points are defined - four corners and center.
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/// \param points Four corner points in clockwise order, fifth point is center,
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/// all in page coordinates.
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void addImage(const std::array<QPointF, 5>& points);
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/// Adds line and line center points
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/// \param start Start point of line, in page coordinates
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/// \param end End point of line, in page coordinates
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void addLine(const QPointF& start, const QPointF& end);
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/// Returns snap points
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const std::vector<SnapPoint>& getSnapPoints() const { return m_snapPoints; }
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private:
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std::vector<SnapPoint> m_snapPoints;
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std::vector<QLineF> m_snapLines;
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};
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/// Snap engine, which handles snapping of points on the page.
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class PDFSnapper
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{
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public:
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PDFSnapper();
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/// Draws snapping points onto the page
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/// \param painter Painter
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/// \param pageIndex Page index
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/// \param compiledPage Compiled page
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/// \param pagePointToDevicePointMatrix Matrix mapping page space to device point space
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void drawSnapPoints(QPainter* painter,
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pdf::PDFInteger pageIndex,
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const PDFPrecompiledPage* compiledPage,
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const QMatrix& pagePointToDevicePointMatrix) const;
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private:
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PDFSnapInfo m_currentPageSnapInfo;
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PDFInteger m_currentPage = -1;
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};
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} // namespace pdf
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#endif // PDFSNAPPER_H
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