How to rotate a TextAnnotation around the anchorpoint

Answered

I have got a CustomTextAnnotation like in this example CustomTextAnnotation
I added a Rendertransform like this.

<s:TextAnnotation.RenderTransform>
    <RotateTransform Angle="90"/>
</s:TextAnnotation.RenderTransform>

But the AnchorPoint is not used as rotation center.
I thought of using ToCoordinate() but need a calculator for that which is not available within CustomTextAnnotation.

What is best practice to achive the requested rotation in sciChart?

Images

WPF Annotation Annotations TextAnnotation RenderTransform LayoutTransform

Bürger Martin asked 9 years ago
last edited 9 years ago

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Answers (1)

Best Answer

I don’t know how to do this in XAML but in the codebehind you can use this

        RotateTransform tns = new RotateTransform();

        tns.Angle = 90;
        verticalText.RenderTransformOrigin = new Point(0.5f, 0.5f);
        verticalText.RenderTransform = tns;

RenderTransformOrigin is the center of the rotation being applied.

kewur answered 9 years ago

- Bürger Martin
- 9 years ago
That did the trick, View (XAML): <s:TextAnnotation RenderTransformOrigin="{Binding RenderOrigin}" ... ViewModel: public Point RenderOrigin { get { var p = new Point(); switch (HorizontalAnchor) { case HorizontalAnchorPoint.Left: p.X = 0; break; case HorizontalAnchorPoint.Center: p.X = 0.5; break; case HorizontalAnchorPoint.Right: p.X = 1; break; } switch (VerticalAnchor) { case VerticalAnchorPoint.Bottom: p.Y = 1; break; case VerticalAnchorPoint.Center: p.Y = 0.5; break; case VerticalAnchorPoint.Top: p.Y = 0; break; } return p; } set { ;} }