GDI+ question Im kindda stuck

Hi forum
I have a task of sending a graphics object to a printer, but I am facing some challenges.

It has to be Device independant and I hav reached quite far in my development.

However i am facing some issues.. I know that text and graphics works totally independant in my solution, and I am managing to scale and resize my graphics correct as long i am using devices(printers) over 300 dpi. using below 300 dpi my graphics is cut accordingly eg 150 will give me the right dimensions but the graphics is cut down to 50%.

Second challenge i am facing is when i am uising odd device dpi, meaning a dpi that will give a decimal when devided by 300. When using a dpi where the result is a full figure when deviding by 300 i can align my text perfect, but when the odd figure is the result my text starts floading on page 2,3 ect.

Below is the code that i have added to the solution. (plz dont laugh im new to c++)

Setting the graphics object (vector)
//start
mp_oControl->iPrintXOrig = XOrigin;
mp_oControl->iPrintYOrig = YOrigin;
CDC *pDC = CDC::FromHandle ((HDC)hdc);
pDC->SetMapMode(MM_TEXT);
oGraphics.TranslateTransform(-(REAL)XOrigin,-(REAL)YOrigin);

oGraphics.ScaleTransform((REAL)DestScale / (REAL)100, (REAL)DestScale / (REAL)100);

oGraphics.SetPageUnit(UnitPixel);

oGraphics.SetPageScale(int(oGraphics.GetDpiX()/mp_oControl->iGlobalPixelsY));

//end

//moving my text according to dpi on the device
//start
ScaleFactorDPI = 1;

if (mp_oControl->globalDPIScale)
ScaleFactorDPI = mp_oControl->globalDPIScale;
// global dpi scale is LOGPIXELSY/300

if (ScaleFactorDPI !=1)
{
double lMulfactor = (float)(mp_oControl->iGlobalPixelsY/300)-1;

double iXorg = mp_oControl->GetMathLib()->RoundDouble((mp_oControl->iPrintXOrig*lMulfactor));
double iYorg = mp_oControl->GetMathLib()->RoundDouble((mp_oControl->iPrintYOrig*lMulfactor));

v_lLeft = (v_lLeft*ScaleFactorDPI)-iXorg;
v_lTop = (v_lTop*ScaleFactorDPI)-iYorg;
v_lRight = (v_lRight*ScaleFactorDPI)-iXorg;
v_lBottom = (v_lBottom*ScaleFactorDPI)-iYorg;

}//end