b2dhommatrix.hxx

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#pragma once
 
#include <sal/config.h>
 
#include <ostream>
 
#include <sal/types.h>
#include <basegfx/basegfxdllapi.h>
#include <basegfx/matrix/hommatrixtemplate.hxx>
#include <array>
 
namespace basegfx
{
    class B2DTuple;
 
    class SAL_WARN_UNUSED BASEGFX_DLLPUBLIC B2DHomMatrix
    {
    private:
        // Since this is a graphics matrix, the last row is always 0 0 1, so we don't bother to store it.
        std::array<std::array<double, 3>, 2> mfValues {
            std::array<double, 3>{ 1.0, 0.0, 0.0 },
            std::array<double, 3>{ 0.0, 1.0, 0.0 } };
 
    public:
        constexpr B2DHomMatrix() = default;
 
        constexpr B2DHomMatrix(double f_0x0, double f_0x1, double f_0x2, double f_1x0, double f_1x1, double f_1x2)
        {
            mfValues[0][0] = f_0x0;
            mfValues[0][1] = f_0x1;
            mfValues[0][2] = f_0x2;
            mfValues[1][0] = f_1x0;
            mfValues[1][1] = f_1x1;
            mfValues[1][2] = f_1x2;
        }
 
        static B2DHomMatrix abcdef(double da, double db, double dc, double dd, double de, double df)
        {
            return B2DHomMatrix(da, dc, de, db, dd, df);
        }
 
        // Convenience accessor for value at 0,0 position in the matrix
        double a() const { return get(0,0); }
        // Convenience accessor for value at 1,0 position in the matrix
        double b() const { return get(1,0); }
        // Convenience accessor for value at 0,1 position in the matrix
        double c() const { return get(0,1); }
        // Convenience accessor for value at 1,1 position in the matrix
        double d() const { return get(1,1); }
        // Convenience accessor for value at 0,2 position in the matrix
        double e() const { return get(0,2); }
        // Convenience accessor for value at 1,2 position in the matrix
        double f() const { return get(1,2); }
 
        double get(sal_uInt16 nRow, sal_uInt16 nColumn) const
        {
            return mfValues[nRow][nColumn];
        }
 
        void set(sal_uInt16 nRow, sal_uInt16 nColumn, double fValue)
        {
            mfValues[nRow][nColumn] = fValue;
        }
 
        void set3x2(double f_0x0, double f_0x1, double f_0x2, double f_1x0, double f_1x1, double f_1x2);
 
        // reset to a standard matrix
        bool isIdentity() const;
        void identity();
 
        bool isInvertible() const;
        bool invert();
 
        void rotate(double fRadiant);
 
        void translate(double fX, double fY);
        void translate(const B2DTuple& rTuple);
 
        void scale(double fX, double fY);
        void scale(const B2DTuple& rTuple);
 
        // Shearing-Matrices
        void shearX(double fSx);
        void shearY(double fSy);
 
        bool operator==(const B2DHomMatrix& rMat) const;
        bool operator!=(const B2DHomMatrix& rMat) const;
 
        // matrix multiplication from the left to the local
        B2DHomMatrix& operator*=(const B2DHomMatrix& rMat);
 
        bool decompose(B2DTuple& rScale, B2DTuple& rTranslate, double& rRotate, double& rShearX) const;
 
    private:
        void computeAdjoint(double (&dst)[6]) const;
        double computeDeterminant(double (&dst)[6]) const;
        void doMulMatrix(const B2DHomMatrix& rMat);
    };
 
    inline B2DHomMatrix operator*(const B2DHomMatrix& rMatA, const B2DHomMatrix& rMatB)
    {
        B2DHomMatrix aMul(rMatB);
        aMul *= rMatA;
        return aMul;
    }
 
    template<typename charT, typename traits>
    std::basic_ostream<charT, traits> & operator <<(
        std::basic_ostream<charT, traits> & stream, B2DHomMatrix const & matrix)
    {
        return stream
            << '[' << matrix.get(0, 0) << ' ' << matrix.get(0, 1) << ' '
            << matrix.get(0, 2) << "; " << matrix.get(1, 0) << ' '
            << matrix.get(1, 1) << ' ' << matrix.get(1, 2) << ']';
    }
} // end of namespace basegfx
 
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