mirror of https://github.com/qpdf/qpdf.git
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
// Copyright (c) 2005-2022 Jay Berkenbilt
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//
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// This file is part of qpdf.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Versions of qpdf prior to version 7 were released under the terms
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// of version 2.0 of the Artistic License. At your option, you may
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// continue to consider qpdf to be licensed under those terms. Please
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// see the manual for additional information.
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#ifndef QPDFMATRIX_HH
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#define QPDFMATRIX_HH
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#include <qpdf/QPDFObjectHandle.hh>
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#include <qpdf/DLL.h>
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#include <string>
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// This class represents a PDF transformation matrix using a tuple
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// such that
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//
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// ┌ ┐
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// │ a b 0 │
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// (a, b, c, d, e, f) = │ c d 0 │
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// │ e f 1 │
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// └ ┘
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class QPDFMatrix
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{
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public:
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QPDF_DLL
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QPDFMatrix();
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QPDF_DLL
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QPDFMatrix(double a, double b, double c,
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double d, double e, double f);
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QPDF_DLL
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QPDFMatrix(QPDFObjectHandle::Matrix const&);
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// Returns the six values separated by spaces as real numbers with
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// trimmed zeroes.
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QPDF_DLL
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std::string unparse() const;
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QPDF_DLL
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QPDFObjectHandle::Matrix getAsMatrix() const;
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// Replace this with other * this
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QPDF_DLL
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void concat(QPDFMatrix const& other);
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// Same as concat(sx, 0, 0, sy, 0, 0)
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QPDF_DLL
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void scale(double sx, double sy);
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// Same as concat(1, 0, 0, 1, tx, ty);
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QPDF_DLL
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void translate(double tx, double ty);
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// Any value other than 90, 180, or 270 is ignored
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QPDF_DLL
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void rotatex90(int angle);
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// Transform a point. The underlying operation is to take
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// [x y 1] * this
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// and take the first and second rows of the result as xp and yp.
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QPDF_DLL
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void transform(double x, double y, double& xp, double& yp) const;
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// ABI: delete non-const version
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QPDF_DLL
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void transform(double x, double y, double& xp, double& yp);
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// Transform a rectangle by creating a new rectangle that tightly
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// bounds the polygon resulting from transforming the four
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// corners.
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QPDF_DLL
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QPDFObjectHandle::Rectangle transformRectangle(
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QPDFObjectHandle::Rectangle r) const;
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// ABI: delete non-const version
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QPDF_DLL
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QPDFObjectHandle::Rectangle transformRectangle(
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QPDFObjectHandle::Rectangle r);
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// operator== tests for exact equality, not considering deltas for
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// floating point.
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QPDF_DLL
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bool operator==(QPDFMatrix const& rhs) const;
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QPDF_DLL
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bool operator!=(QPDFMatrix const& rhs) const
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{
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return ! operator==(rhs);
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}
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double a;
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double b;
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double c;
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double d;
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double e;
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double f;
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};
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#endif // QPDFMATRIX_HH
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