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/////////////////////////////////////////////////////////////////////////////
// Name: wx/affinematrix2dbase.h
// Purpose: Common interface for 2D transformation matrices.
// Author: Catalin Raceanu
// Created: 2011-04-06
// Copyright: (c) wxWidgets team
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_AFFINEMATRIX2DBASE_H_
#define _WX_AFFINEMATRIX2DBASE_H_
#include "wx/defs.h"
#if wxUSE_GEOMETRY
#include "wx/geometry.h"
struct wxMatrix2D
{
wxMatrix2D(wxDouble v11 = 1,
wxDouble v12 = 0,
wxDouble v21 = 0,
wxDouble v22 = 1)
{
m_11 = v11; m_12 = v12;
m_21 = v21; m_22 = v22;
}
wxDouble m_11, m_12, m_21, m_22;
};
// A 2x3 matrix representing an affine 2D transformation.
//
// This is an abstract base class implemented by wxAffineMatrix2D only so far,
// but in the future we also plan to derive wxGraphicsMatrix from it (it should
// also be documented then as currently only wxAffineMatrix2D itself is).
class WXDLLIMPEXP_CORE wxAffineMatrix2DBase
{
public:
wxAffineMatrix2DBase() {}
virtual ~wxAffineMatrix2DBase() {}
// sets the matrix to the respective values
virtual void Set(const wxMatrix2D& mat2D, const wxPoint2DDouble& tr) = 0;
// gets the component valuess of the matrix
virtual void Get(wxMatrix2D* mat2D, wxPoint2DDouble* tr) const = 0;
// concatenates the matrix
virtual void Concat(const wxAffineMatrix2DBase& t) = 0;
// makes this the inverse matrix
virtual bool Invert() = 0;
// return true if this is the identity matrix
virtual bool IsIdentity() const = 0;
// returns true if the elements of the transformation matrix are equal ?
virtual bool IsEqual(const wxAffineMatrix2DBase& t) const = 0;
bool operator==(const wxAffineMatrix2DBase& t) const { return IsEqual(t); }
bool operator!=(const wxAffineMatrix2DBase& t) const { return !IsEqual(t); }
//
// transformations
//
// add the translation to this matrix
virtual void Translate(wxDouble dx, wxDouble dy) = 0;
// add the scale to this matrix
virtual void Scale(wxDouble xScale, wxDouble yScale) = 0;
// add the rotation to this matrix (counter clockwise, radians)
virtual void Rotate(wxDouble ccRadians) = 0;
// add mirroring to this matrix
void Mirror(int direction = wxHORIZONTAL)
{
wxDouble x = (direction & wxHORIZONTAL) ? -1 : 1;
wxDouble y = (direction & wxVERTICAL) ? -1 : 1;
Scale(x, y);
}
// applies that matrix to the point
wxPoint2DDouble TransformPoint(const wxPoint2DDouble& src) const
{
return DoTransformPoint(src);
}
void TransformPoint(wxDouble* x, wxDouble* y) const
{
wxCHECK_RET( x && y, "Can't be NULL" );
const wxPoint2DDouble dst = DoTransformPoint(wxPoint2DDouble(*x, *y));
*x = dst.m_x;
*y = dst.m_y;
}
// applies the matrix except for translations
wxPoint2DDouble TransformDistance(const wxPoint2DDouble& src) const
{
return DoTransformDistance(src);
}
void TransformDistance(wxDouble* dx, wxDouble* dy) const
{
wxCHECK_RET( dx && dy, "Can't be NULL" );
const wxPoint2DDouble
dst = DoTransformDistance(wxPoint2DDouble(*dx, *dy));
*dx = dst.m_x;
*dy = dst.m_y;
}
protected:
virtual
wxPoint2DDouble DoTransformPoint(const wxPoint2DDouble& p) const = 0;
virtual
wxPoint2DDouble DoTransformDistance(const wxPoint2DDouble& p) const = 0;
};
#endif // wxUSE_GEOMETRY
#endif // _WX_AFFINEMATRIX2DBASE_H_
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