Set AnnotationXY to be Displayed on Top Right of Chart

[hallo888]

Hi,

I would like to have the annotation to always show up at the top right hand corner of the chart, no matter what size. Below is what i did.

Set the annotationXY coordinate system to "ScreenCoordinates" to reference in pixels. First to compute the size of the annotation box, get the width and height of the chart in pixels.

Code: Select all

PointInt p = chart.MeasureText(annotation.Text,annotation.TextStyle.Font);
int widthPixel = p.X + annotation.AutoSizePadding*2;
int heightPixel = p.Y + annotation.AutoSizePadding*2;

annotation.LocationAxisValues.X = chart.ActualWidth - widthPixel;
annotation.LocationAxisValues.Y = chart.ActualHeight - heightPixel;

But the above resulting in the annotation text showing up in the top left hand corner of the chart with part of the annotation text being clipped.

What do i need to change to achieve what i need.

And also, is it also possible to print the Annotation text outside the chart, along the margins of the chart so as not to block the chart contents? What do i need to set to do that?

Thanks!

[ArctionPasi]

Code: Select all

m_chart.SizeChanged += m_chart_SizeChanged;

AnnotationXY annot = new AnnotationXY(m_chart.ViewXY, m_chart.ViewXY.XAxes[0], m_chart.ViewXY.YAxes[0]);
            annot.Anchor.SetValues(1, 0); //Location sets now the top-right of the annotation. 
            annot.Style = AnnotationStyle.Rectangle;
            annot.ClipInsideGraph = false; 
            annot.LocationCoordinateSystem = CoordinateSystem.ScreenCoordinates;
            m_chart.ViewXY.Annotations.Add(annot);


void m_chart_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            m_chart.BeginUpdate(); 

            m_chart.ViewXY.Annotations[0].LocationScreenCoords.X = m_chart.ViewXY.GetMarginsRect().Right;
            m_chart.ViewXY.Annotations[0].LocationScreenCoords.Y = m_chart.ViewXY.GetMarginsRect().Top; 

            m_chart.EndUpdate(); 

        }

Then it aligns it top top-right:

Chart annotation aligned to top-right

Annotation aligned to graph top-right.jpg (102.84 KiB) Viewed 7736 times

By setting
annot.ClipInsideGraph = false;

It will allow the annotation to render over the margins:

Annotation over margins

Annotation over margins.jpg (46.21 KiB) Viewed 7736 times