No transformation result with QImage transformed

doubitchou

Hi,
I'm currently implementing a class that operates on Matrices based on QImage as described bellow. But even if I know from docs that Transformed returns a copy of the QImage, no transformation occurs.

What is wrong with LineShift this please?

Matrix.cpp

MathMatrix::MathMatrix(const QString MName, const quint16 MCols, const quint16 MRows, const quint32 MColors):
    Name(MName),Cols(MCols),Rows(MRows),Colors( MColors)
{
     WorkMatrix = new QImage(Cols,Rows,QImage::Format_RGB32);
     Name = MName;
     Cols= MCols ;
     Rows = MRows;
     Colors  = MColors;
     Reset();
}

void MathMatrix::LineShift(  int Offset)
{
   *WorkMatrix = WorkMatrix->transformed(QTransform().translate(0,Offset)) ;
}

void MathMatrix::Fill(uint Value)
{
    WorkMatrix->fill(Value);
}
etc...

Matrix.h

class MathMatrix
{
private:
    QString Name ;
    quint16 Cols;
    quint16 Rows ;
    quint32 Colors ;
    QImage *WorkMatrix;

public:
    MathMatrix(const QString MName="Matrix Name", const quint16 MCols=8 , const quint16 MRows=8, const quint32 MColors=3);
    ~MathMatrix();
    QString getName()   { return Name   ;}
    quint16 getCols()   { return Cols   ;}
    quint16 getRows()   { return Rows   ;}
    quint32 getColors() { return Colors ;}
    
    void Fill(uint Value);
    void Fill(QColor NamedColor);   
    void LineShift(int Offset);
    void TestMatrix();
};

This class is called like this :

ProjectMatrix::ProjectMatrix(const QString M_Name, const quint16 M_Cols, const quint16 M_Rows, const quint32 M_Colors)
{
    MathMatrix ProjMatrix(M_Name,M_Cols,M_Rows,M_Colors);
    ProjMatrix.SetLine(1,0xFF000001) ;
    ProjMatrix.LineShift( 1);
}