mgwmatrix.cpp

monqueror一个很具有参考价值的源玛

#include "render_interface.h"
#include "mgrect.h"
#include "mgwmatrix.h"

MGWMatrix::MGWMatrix()
{
    _m11 = _m22 = 1.0;
    _m12 = _m21 = _dx = _dy = 0.0;
}

MGWMatrix::MGWMatrix( double m11, double m12, double m21, double m22,
		double dx, double dy )
{
    _m11 = m11;	 _m12 = m12;
    _m21 = m21;	 _m22 = m22;
    _dx	 = dx;	 _dy  = dy;
}

MGWMatrix::~MGWMatrix()
{
}

MGWMatrix& MGWMatrix::scale( double sx, double sy )
{
    MGWMatrix result( sx, 0.0F, 0.0F, sy, 0.0F, 0.0F );
    return bmul( result );
}
				
MGRect MGWMatrix::map( const MGRect& )
{
	// TODO
	return MGRect();
}

void MGWMatrix::setMatrix( double m11, double m12, double m21, double m22,
			  double dx, double dy )
{
    _m11 = m11;	 _m12 = m12;
    _m21 = m21;	 _m22 = m22;
    _dx	 = dx;	 _dy  = dy;
}

MGWMatrix &MGWMatrix::bmul( const MGWMatrix &m )
{
    setMatrix( m._m11*_m11 + m._m12*_m21,  m._m11*_m12 + m._m12*_m22,
	       m._m21*_m11 + m._m22*_m21,  m._m21*_m12 + m._m22*_m22,
	       m._dx*_m11  + m._dy*_m21 + _dx,
	       m._dx*_m12  + m._dy*_m22 + _dy );
    return *this;
}