Direct2D Transform
- by James
I have a beginner question about Direct2D transforms. I have a 20 x 10 bitmap that I would like to draw in different orientations.
To start, I would like to draw it vertically with a destination rectangle of say:
(left, top, right, bottom)
(300, 300, 310, 320)
The bitmap is wider than it is tall (20 x 10), but when I draw it vertically, it will be appear taller than it is wide (10 x 20).
I know that I can use a rotation matrix like so:
m_pRenderTarget->SetTransform(
D2D1::Matrix3x2F::Rotation(
90.0f,
D2D1::Point2F(<center of shape>))
);
But when I use this method to rotate my shape, the destination rectangle is still wider than it is tall. Maybe it would look something like this:
(left, top, right, bottom)
(280, 290, 300, 300)
The destination rectangle is 20 x 10 but the bitmap appears on the screen as 10 x 20. I can't look at the destination rectangle in the debugger and compare it to:
(left, top, right, bottom)
(300, 300, 310, 320)
Is there any simple way to say "I want to rotate it so that the image is rendered to exactly this destination rectangle after the rotation?" In this case, I would like to say "Please rotate the bitmap so that it appears on the screen at this location:"
(left, top, right, bottom)
(300, 300, 310, 320)
If I can't do that, is there any way to find out the 10 x 20 destination rectangle where the bitmap is actually being rendered to the screen?
