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142
Source/Ember/Affine2D.h
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142
Source/Ember/Affine2D.h
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#pragma once
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#include "Utils.h"
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/// <summary>
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/// Affine2D class.
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/// </summary>
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namespace EmberNs
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{
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/// <summary>
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/// Uses matrix composition to handle the
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/// affine matrix. Taken almost entirely from
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/// Fractron, but using glm, and in C++.
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/// Note that the matrix layout differs from flam3 so it's best to use
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/// the A, B, C, D, E, F wrappers around the underlying matrix indices. But if the matrix must
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/// be accessed directly, the two are laid out as such:
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/// flam3: 3 columns of 2 rows each. Accessed col, row.
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/// [a(0,0)][b(1,0)][c(2,0)]
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/// [d(0,1)][e(1,1)][f(2,1)]
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/// Ember: 2 columns of 3 rows each. Accessed col, row.
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/// [a(0,0)][d(1,0)]
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/// [b(0,1)][e(1,1)]
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/// [c(0,2)][f(1,2)]
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/// Template argument expected to be float or double.
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/// </summary>
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template <typename T>
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class EMBER_API Affine2D
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{
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public:
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Affine2D();
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/// <summary>
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/// Default copy constructor.
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/// </summary>
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/// <param name="affine">The Affine2D object to copy</param>
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Affine2D(const Affine2D<T>& affine)
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{
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Affine2D<T>::operator=<T>(affine);
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}
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/// <summary>
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/// Copy constructor to copy an Affine2D object of type U.
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/// </summary>
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/// <param name="affine">The Affine2D object to copy</param>
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template <typename U>
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Affine2D(const Affine2D<U>& affine)
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{
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Affine2D<T>::operator=<U>(affine);
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}
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Affine2D(v2T& x, v2T& y, v2T& t);
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Affine2D(T xx, T xy, T yx, T yy, T tx, T ty);
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Affine2D(m4T& mat);
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/// <summary>
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/// Default assignment operator.
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/// </summary>
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/// <param name="affine">The Affine2D object to copy</param>
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Affine2D<T>& operator = (const Affine2D<T>& affine)
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{
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if (this != &affine)
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Affine2D<T>::operator=<T>(affine);
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return *this;
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}
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/// <summary>
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/// Assignment operator to assign an Affine2D object of type U.
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/// </summary>
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/// <param name="affine">The Affine2D object to copy.</param>
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/// <returns>Reference to updated self</returns>
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template <typename U>
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Affine2D<T>& operator = (const Affine2D<U>& affine)
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{
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A(T(affine.A()));
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B(T(affine.B()));
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C(T(affine.C()));
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D(T(affine.D()));
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E(T(affine.E()));
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F(T(affine.F()));
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return *this;
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}
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inline void MakeID();
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inline bool IsID() const;
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inline bool IsZero() const;
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inline void Rotate(T angle);
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inline void Translate(v2T& v);
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inline void RotateScaleXTo(v2T& v);
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inline void RotateScaleYTo(v2T& v);
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inline Affine2D<T> Inverse() const;
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inline v2T TransformNormal(const v2T& v) const;
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inline v2T TransformVector(const v2T& v) const;
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inline m2T ToMat2ColMajor() const;
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inline m2T ToMat2RowMajor() const;
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inline m4T ToMat4ColMajor(bool center = false) const;
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inline m4T ToMat4RowMajor(bool center = false) const;
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bool operator == (const Affine2D<T>& affine);
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Affine2D<T>& operator * (const Affine2D<T>& affine);
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v2T operator * (const v2T& v);
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inline T A() const;
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inline T B() const;
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inline T C() const;
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inline T D() const;
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inline T E() const;
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inline T F() const;
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inline void A(T a);
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inline void B(T b);
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inline void C(T c);
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inline void D(T d);
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inline void E(T e);
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inline void F(T f);
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inline v2T X() const;
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inline v2T Y() const;
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inline v2T O() const;
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inline void X(v2T& x);
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inline void Y(v2T& y);
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inline void O(v2T& t);
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//static Affine2D Identity();//Complains about inline.
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static inline Affine2D CalcRotateScale(v2T& from, v2T& to);
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static inline void CalcRSAC(v2T& from, v2T& to, T& a, T& c);
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m23T m_Mat;
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};
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//This class had to be implemented in a cpp file because the compiler was breaking.
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//So the explicit instantiation must be declared here rather than in Ember.cpp where
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//all of the other classes are done.
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template EMBER_API class Affine2D<float>;
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#ifdef DO_DOUBLE
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template EMBER_API class Affine2D<double>;
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#endif
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}
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