/* * Copyright 2008-2010, Haiku, Inc. All Rights Reserved. * Distributed under the terms of the MIT License. * * Authors: * Stephen Deken, stephen.deken@gmail.com * Stephan Aßmus */ //---------------------------------------------------------------------------- // Anti-Grain Geometry - Version 2.4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) // // Permission to copy, use, modify, sell and distribute this software // is granted provided this copyright notice appears in all copies. // This software is provided "as is" without express or implied // warranty, and with no claim as to its suitability for any purpose. // //---------------------------------------------------------------------------- // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://www.antigrain.com //---------------------------------------------------------------------------- #ifndef _AFFINE_TRANSFORM_H #define _AFFINE_TRANSFORM_H #include #include #include class BAffineTransform : public BFlattenable { public: static const double kDefaultEpsilon = 1e-14; public: BAffineTransform(); BAffineTransform(double sx, double shy, double shx, double sy, double tx, double ty); BAffineTransform( const BAffineTransform& copyFrom); virtual ~BAffineTransform(); // BFlattenable interface virtual bool IsFixedSize() const; virtual type_code TypeCode() const; virtual ssize_t FlattenedSize() const; virtual status_t Flatten(void* buffer, ssize_t size) const; virtual status_t Unflatten(type_code code, const void* buffer, ssize_t size); // Construction static BAffineTransform AffineTranslation(double x, double y); static BAffineTransform AffineRotation(double angle); static BAffineTransform AffineScaling(double x, double y); static BAffineTransform AffineScaling(double scale); static BAffineTransform AffineShearing(double x, double y); // Application inline void Apply(double* x, double* y) const; inline void ApplyInverse(double* x, double* y) const; BPoint Apply(const BPoint& point) const; BPoint ApplyInverse(const BPoint& point) const; void Apply(BPoint* point) const; void ApplyInverse(BPoint* point) const; void Apply(BPoint* points, uint32 count) const; void ApplyInverse(BPoint* points, uint32 count) const; // Translation inline const BAffineTransform& TranslateBy(double x, double y); const BAffineTransform& TranslateBy(const BPoint& delta); BAffineTransform TranslateByCopy(double x, double y) const; BAffineTransform TranslateByCopy(const BPoint& delta) const; // Rotation inline const BAffineTransform& RotateBy(double angle); const BAffineTransform& RotateBy(const BPoint& center, double angle); BAffineTransform RotateByCopy(double angle) const; BAffineTransform RotateByCopy(const BPoint& center, double angle) const; // Scaling inline const BAffineTransform& ScaleBy(double scale); const BAffineTransform& ScaleBy(const BPoint& center, double scale); inline const BAffineTransform& ScaleBy(double x, double y); const BAffineTransform& ScaleBy(const BPoint& center, double x, double y); const BAffineTransform& ScaleBy(const BPoint& scale); const BAffineTransform& ScaleBy(const BPoint& center, const BPoint& scale); BAffineTransform ScaleByCopy(double scale) const; BAffineTransform ScaleByCopy(const BPoint& center, double scale) const; BAffineTransform ScaleByCopy(double x, double y) const; BAffineTransform ScaleByCopy(const BPoint& center, double x, double y) const; BAffineTransform ScaleByCopy(const BPoint& scale) const; BAffineTransform ScaleByCopy(const BPoint& center, const BPoint& scale) const; // Shearing inline const BAffineTransform& ShearBy(double x, double y); const BAffineTransform& ShearBy(const BPoint& center, double x, double y); const BAffineTransform& ShearBy(const BPoint& shear); const BAffineTransform& ShearBy(const BPoint& center, const BPoint& shear); BAffineTransform ShearByCopy(double x, double y) const; BAffineTransform ShearByCopy(const BPoint& center, double x, double y) const; BAffineTransform ShearByCopy(const BPoint& shear) const; BAffineTransform ShearByCopy(const BPoint& center, const BPoint& shear) const; // Multiplication inline const BAffineTransform& Multiply(const BAffineTransform& other); const BAffineTransform& PreMultiply(const BAffineTransform& other); inline const BAffineTransform& MultiplyInverse( const BAffineTransform& other); inline const BAffineTransform& PreMultiplyInverse( const BAffineTransform& other); // Operators inline BAffineTransform& operator=( const BAffineTransform& copyFrom); inline bool operator==( const BAffineTransform& other) const; inline bool operator!=( const BAffineTransform& other) const; inline const BAffineTransform& operator*=(const BAffineTransform& other); inline const BAffineTransform& operator/=(const BAffineTransform& other); inline BAffineTransform operator*( const BAffineTransform& other) const; inline BAffineTransform operator/( const BAffineTransform& other) const; inline BAffineTransform operator~() const; // Utility bool IsValid(double epsilon = kDefaultEpsilon) const; bool IsIdentity(double epsilon = kDefaultEpsilon) const; bool IsEqual(const BAffineTransform& other, double epsilon = kDefaultEpsilon) const; const BAffineTransform& Invert(); const BAffineTransform& FlipX(); const BAffineTransform& FlipY(); const BAffineTransform& Reset(); inline double Determinant() const; inline double InverseDeterminant() const; void GetTranslation(double* tx, double* ty) const; double Rotation() const; double Scale() const; void GetScale(double* sx, double* sy) const; void GetScaleAbs(double* sx, double* sy) const; bool GetAffineParameters(double* translationX, double* translationY, double* rotation, double* scaleX, double* scaleY, double* shearX, double* shearY) const; public: double sx; double shy; double shx; double sy; double tx; double ty; }; // #pragma mark - inline methods inline void BAffineTransform::Apply(double* x, double* y) const { register double tmp = *x; *x = tmp * sx + *y * shx + tx; *y = tmp * shy + *y * sy + ty; } inline void BAffineTransform::ApplyInverse(double* x, double* y) const { register double d = InverseDeterminant(); register double a = (*x - tx) * d; register double b = (*y - ty) * d; *x = a * sy - b * shx; *y = b * sx - a * shy; } // #pragma mark - inline const BAffineTransform& BAffineTransform::TranslateBy(double x, double y) { tx += x; ty += y; return *this; } inline const BAffineTransform& BAffineTransform::RotateBy(double angle) { double ca = cos(angle); double sa = sin(angle); double t0 = sx * ca - shy * sa; double t2 = shx * ca - sy * sa; double t4 = tx * ca - ty * sa; shy = sx * sa + shy * ca; sy = shx * sa + sy * ca; ty = tx * sa + ty * ca; sx = t0; shx = t2; tx = t4; return *this; } inline const BAffineTransform& BAffineTransform::ScaleBy(double x, double y) { double mm0 = x; // Possible hint for the optimizer double mm3 = y; sx *= mm0; shx *= mm0; tx *= mm0; shy *= mm3; sy *= mm3; ty *= mm3; return *this; } inline const BAffineTransform& BAffineTransform::ScaleBy(double s) { double m = s; // Possible hint for the optimizer sx *= m; shx *= m; tx *= m; shy *= m; sy *= m; ty *= m; return *this; } inline const BAffineTransform& BAffineTransform::ShearBy(double x, double y) { BAffineTransform shearTransform = AffineShearing(x, y); return PreMultiply(shearTransform); } // #pragma mark - inline const BAffineTransform& BAffineTransform::Multiply(const BAffineTransform& other) { BAffineTransform t(other); return *this = t.PreMultiply(*this); } inline const BAffineTransform& BAffineTransform::MultiplyInverse(const BAffineTransform& other) { BAffineTransform t(other); t.Invert(); return Multiply(t); } inline const BAffineTransform& BAffineTransform::PreMultiplyInverse(const BAffineTransform& other) { BAffineTransform t(other); t.Invert(); return *this = t.Multiply(*this); } // #pragma mark - inline BAffineTransform& BAffineTransform::operator=(const BAffineTransform& other) { sx = other.sx; shy = other.shy; shx = other.shx; sy = other.sy; tx = other.tx; ty = other.ty; return *this; } inline bool BAffineTransform::operator==(const BAffineTransform& other) const { return IsEqual(other); } inline bool BAffineTransform::operator!=(const BAffineTransform& other) const { return !IsEqual(other); } inline const BAffineTransform& BAffineTransform::operator*=(const BAffineTransform& other) { return Multiply(other); } inline const BAffineTransform& BAffineTransform::operator/=(const BAffineTransform& other) { return MultiplyInverse(other); } inline BAffineTransform BAffineTransform::operator*(const BAffineTransform& other) const { return BAffineTransform(*this).Multiply(other); } inline BAffineTransform BAffineTransform::operator/(const BAffineTransform& other) const { return BAffineTransform(*this).MultiplyInverse(other); } inline BAffineTransform BAffineTransform::operator~() const { BAffineTransform result(*this); return result.Invert(); } // #pragma mark - inline double BAffineTransform::Determinant() const { return sx * sy - shy * shx; } inline double BAffineTransform::InverseDeterminant() const { return 1.0 / (sx * sy - shy * shx); } #endif // _AFFINE_TRANSFORM_H