Re: rotation and flipping the bitmap

In article <54cb8288-6d4b-4f30-ac37-b0f6f2caed63
@s8g2000prg.googlegroups.com>, swethakiran.korada@gmail.com says...

[ ... ]


First the standard utility routine to convert from degrees to radians:

float deg2rad(float angle) {
    return angle * 3.1416f / 180.0f;
}

Then, this goes into your OnDraw routine, where you'd normally start out
with a comment saying something about inserting code to draw your native
data or something like that:

    // there will be code something like:
    // CWhateverDoc* pDoc = GetDocument();
    // ASSERT_VALID(pDoc);

    // Then you add this:
    HDC dc = pDC->GetSafeHdc();

    XFORM xform;

    float angle = deg2rad(30.0f);

    xform.eDx = 0.0f;
    xform.eDy = 0.0f;
    xform.eM11 = cos(angle);
    xform.eM12 = sin(angle);
    xform.eM21 = -sin(angle);
    xform.eM22 = cos(angle);

    SetGraphicsMode(dc, GM_ADVANCED);
    SetWorldTransform(dc, &xform);

    pDC->TextOut(100, 0, "This is a string");

Of course, if you only wanted to print out text, you could just create a
font with the lfEscapement set to the correct angle -- but this also
rotates other output as well, such as anything you do with BitBlt,
StretchBlt, Rectangle, etc.

--
    Later,
    Jerry.

The universe is a figment of its own imagination.