Hello, there,

I have no idea how to draw an ellipse with an rotated
angle. For example, the ellipse's center is (20.0, 50.0),
two conjugate diameter pairs end-point are (35.0, 35.0),
(25.0, 55.0). I hope to use win32 API functions to finish
this drawing. Is it possible?

Please help me giving your suggestion. Tks.

Graphics.RotateTransform Method


"Shalley" <(E-Mail Removed)> wrote in message
news:2daf01c374a7$c5b48b50$(E-Mail Removed)...
> Hello, there,
>
> I have no idea how to draw an ellipse with an rotated
> angle. For example, the ellipse's center is (20.0, 50.0),
> two conjugate diameter pairs end-point are (35.0, 35.0),
> (25.0, 55.0). I hope to use win32 API functions to finish
> this drawing. Is it possible?
>
> Please help me giving your suggestion. Tks.

Shalley,
In addition to One Handed Man's comment about Graphics.RotateTransform, you
may need to take into account Graphics.ScaleTransform &
Graphics.TranslateTransform (TranslateTransform more so than
ScaleTransform).

RotateTransform will rotate about the current origin, TranslateTransform
moves the current origin.

I find Charles Petzold's book "Programming Microsoft Windows with Microsoft
Visual Basic .NET" from MS Press to be very helpful in unraveling the
subtleties of GDI+.

Just remember order of operations is important while doing transforms in
GDI+.

Hope this helps
Jay

"Shalley" <(E-Mail Removed)> wrote in message
news:2daf01c374a7$c5b48b50$(E-Mail Removed)...
> Hello, there,
>
> I have no idea how to draw an ellipse with an rotated
> angle. For example, the ellipse's center is (20.0, 50.0),
> two conjugate diameter pairs end-point are (35.0, 35.0),
> (25.0, 55.0). I hope to use win32 API functions to finish
> this drawing. Is it possible?
>
> Please help me giving your suggestion. Tks.

Hello,

"Jay B. Harlow [MVP - Outlook]" <(E-Mail Removed)> schrieb:
> Just remember order of operations is important while doing
> transforms in GDI+.

That depends on the type of the operations.

;-)

--
Herfried K. Wagner
MVP · VB Classic, VB.NET
http://www.mvps.org/dotnet

Herfried,
> That depends on the type of the operations.
And if you use the MatrixOrder parameter & which MatrixOrder option. ;-)

Later
Jay

"Herfried K. Wagner [MVP]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hello,
>
> "Jay B. Harlow [MVP - Outlook]" <(E-Mail Removed)> schrieb:
> > Just remember order of operations is important while doing
> > transforms in GDI+.
>
> That depends on the type of the operations.
>
> ;-)
>
> --
> Herfried K. Wagner
> MVP · VB Classic, VB.NET
> http://www.mvps.org/dotnet
>
>