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// Copyright (c) 2005-2023 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.
#ifndef QPDFMATRIX_HH
#define QPDFMATRIX_HH
#include <qpdf/DLL.h>
#include <qpdf/QPDFObjectHandle.hh>
#include <string>
// This class represents a PDF transformation matrix using a tuple
// such that
//
// ┌ ┐
// │ a b 0 │
// (a, b, c, d, e, f) = │ c d 0 │
// │ e f 1 │
// └ ┘
class QPDFMatrix
{
public:
QPDF_DLL
QPDFMatrix();
QPDF_DLL
QPDFMatrix(double a, double b, double c, double d, double e, double f);
QPDF_DLL
QPDFMatrix(QPDFObjectHandle::Matrix const&);
// Returns the six values separated by spaces as real numbers with
// trimmed zeroes.
QPDF_DLL
std::string unparse() const;
QPDF_DLL
QPDFObjectHandle::Matrix getAsMatrix() const;
// Replace this with other * this
QPDF_DLL
void concat(QPDFMatrix const& other);
// Same as concat(sx, 0, 0, sy, 0, 0)
QPDF_DLL
void scale(double sx, double sy);
// Same as concat(1, 0, 0, 1, tx, ty);
QPDF_DLL
void translate(double tx, double ty);
// Any value other than 90, 180, or 270 is ignored
QPDF_DLL
void rotatex90(int angle);
// Transform a point. The underlying operation is to take
// [x y 1] * this
// and take the first and second rows of the result as xp and yp.
QPDF_DLL
void transform(double x, double y, double& xp, double& yp) const;
// Transform a rectangle by creating a new rectangle that tightly
// bounds the polygon resulting from transforming the four
// corners.
QPDF_DLL
QPDFObjectHandle::Rectangle
transformRectangle(QPDFObjectHandle::Rectangle r) const;
// operator== tests for exact equality, not considering deltas for
// floating point.
QPDF_DLL
bool operator==(QPDFMatrix const& rhs) const;
QPDF_DLL
bool
operator!=(QPDFMatrix const& rhs) const
{
return !operator==(rhs);
}
double a;
double b;
double c;
double d;
double e;
double f;
};
#endif // QPDFMATRIX_HH
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