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 10 years ago
last edited 10 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 10 years ago

- Bürger Martin
- 10 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 { ;} }