Draw a rectanlge that has a rotation applied using DrawingContext

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Hi,

I am using c# and creating some line drawings. I want to create a rectangle or possibly rounded rectangle drawing but with a rotation applied to it.

Im declaring using:

C#

System.Windows.Rect rect = new System.Windows.Rect(startpos.X, startpos.Y, halfsize*2, halfsize * 4);

I now need to rotate this flat rectangle by say, 30 degrees and THEN draw it.

How do I do this?

I am using the drawing context object to render.

Thanks in advance!

Posted 30-Aug-13 2:06am

mccaber82

Updated 31-Aug-13 12:37pm

v3

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mccaber82 30-Aug-13 8:30am

Just to elaborate this is C# .net v4.5

Sergey Alexandrovich Kryukov 30-Aug-13 10:57am

You rather need to tag the UI library or application type you are using. And your "THEN" is irrelevant — just think about it...
—SA

mccaber82 30-Aug-13 11:03am

Thank you for that unbelievably insightful comment. Perhaps you could be helpful enough to explain how to update tags after the question has been posted??

Sergey Alexandrovich Kryukov 30-Aug-13 11:41am

With pleasure: click at Improve question.
Please understand that is can be critical to get help, because if the library is uncertain, many people would not post solution for different ones, as such solutions can be very different.

But at this moment I see you already got a solution. Great.

—SA

2 solutions

Solution 1

Try some of these links[^].

Posted 30-Aug-13 3:13am

Richard MacCutchan

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mccaber82 · Accepted Answer · 2013-08-30T05:05:00

Ok, worked it out thanks to Richard's steer. Here's the code:

// Rectangle to draw.
System.Windows.Rect rect = new System.Windows.Rect(startpos.X, startpos.Y, width, height);
           
// Set rotation on drawing context.
drawingContext.PushTransform(new Media.RotateTransform(angle, ratio.X, ratio.Y));
            
// Draw our rectangle.
drawingContext.DrawRectangle(null, myPen, rect);

// Remove transformation for rotation as its no longer needed.
drawingContext.Pop();