The following example sets the world transformation of a
Graphics object to a rotation. The call to
GdipTranslateWorldTransform multiplies the
Graphics object's existing world transformation matrix (rotation) by a translation matrix. The
MatrixOrderAppend argument specifies that the multiplication is done with the translation matrix on the right. At that point, the world transformation matrix of the
Graphics object represents a composite transformation: first rotate, then translate. The call to
GdipDrawEllipse draws a rotated and translated ellipse.
C++
VOID Example_TranslateTransform(HDC hdc)
{
Graphics graphics(hdc);
Pen pen(Color(255, 0, 0, 255));
graphics.RotateTransform(30.0f);
graphics.TranslateTransform(100.0f, 50.0f, MatrixOrderAppend);
graphics.DrawEllipse(&pen, 0, 0, 200, 80);
}
SUB GDIP_TranslateWorldTransform (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pPen AS DWORD
hStatus = GdipCreateFromHDC(hdc, pGraphics)
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 255), 1, %UnitPixel, pPen)
hStatus = GdipRotateWorldTransform(pGraphics, 50.0!, %MatrixOrderPrepend)
hStatus = GdipTranslateWorldTransform(pGraphics, 100.0!, 50.0!, %MatrixOrderAppend)
hStatus = GdipDrawEllipse(pGraphics, pPen, 0, 0, 200, 80)
' // Cleanup
IF pPen THEN GdipDeletePen(pPen)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
(http://www.jose.it-berater.org/captures/GdipTranslateWorldTransform.png)