WPF Rect Transform

Question

I am trying to apply RotateTransform to a Rect object with the following code.

Rect transformed = this.Rectangle;
transformed.Transform(this.rotateTransform.Value);
DrawingVisual visual = new DrawingVisual();
DrawingContext context = visual.RenderOpen();
context.DrawRectangle(null, new Pen(Brushes.Blue, 2), transformed);
context.Close();
canvas.Children.Add(visual);

but the rectangle is not rotated. However when I push the transformation to the DrawingContext, as in the following code, rectangle is transformed correctly.

Rect transformed = this.Rectangle;
DrawingVisual visual = new DrawingVisual();
DrawingContext context = visual.RenderOpen();
context.PushTransform(this.rotateTransform);
context.DrawRectangle(null, new Pen(Brushes.Blue, 2), transformed);
context.Pop();
context.Close();
canvas.Children.Add(visual);

Is there a way to transform a Rect as in the first code fragment with Rect.Transform(Matrix) function?

Abc · Accepted Answer · 2011-01-05 21:24:00Z

2

Prabably because your rotation is not multiple of 90deg. Transform on Rect results in rect that it parallel to x & y axis!

First case renders modified rectangle that is not rotated a syou desire - seems to be bouding box after rotation
Second case doest what you wish - it first "rotate content", then draws rectangle

answered Jan 5, 2011 at 21:24

Abc

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1 Comment

Alp Over a year ago

Yes first case draws a bounding box of the rotated rectangle in the second case. So I guess rotating a Rect as in first case is not possible.

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