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Have a good day!

I’m working with render context in modifiers. I have this code snippet:

public override void OnParentSurfaceRendered(SciChartRenderedMessage e)
        {
            if (Mouse.LeftButton == MouseButtonState.Pressed&&IsEnabled)
            {
                if (ParentSurface == null) return;
                var yCalc = ParentSurface.YAxes.GetAxisById(TextOfYAxis);
                var startTVD = yCalc.GetDataValue(StartPoint.Y);
                var finalTVD = yCalc.GetDataValue(CurrentPoint.Y);
                var deltaTVD = Math.Round((double) finalTVD - (double) startTVD);
                var pen = e.RenderContext.CreatePen(Colors.Red,true,1);
                var brush = e.RenderContext.CreateBrush(Colors.Red);
                e.RenderContext.DrawLine(pen, StartPoint, new Point(StartPoint.X, CurrentPoint.Y));
                e.RenderContext.DrawEllipse(pen, brush, StartPoint, 4, 4);
                e.RenderContext.DrawEllipse(pen,brush,new Point(StartPoint.X,CurrentPoint.Y),2,2);
                e.RenderContext.DrawText(
                    new Rect(new Point(CurrentPoint.X - 20, CurrentPoint.Y - 20), new Size(100, 30)), Colors.Red, 10,
                    "Delta TVD:" + Math.Round(Geomodel.DeltaTVD + deltaTVD, 2));
                pen.Dispose();
            }
        }

My aim is to place rectangle below line series.
Is there any way to work with z-index of such method of drawing?

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1
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Hi Vyacheslav,

Actually, it is possible, but we haven’t published this part of the API as its only used internally. There is the concept of Layers in the render context.

Take a look at this code

renderContext.Layers[RenderLayer.AxisMajorGridlines].Enqueue(() => 
{
    // any drawing operations here will be performed after the AxisMajorGridlines and before the RenderableSeries
    renderContext.DrawLine( ... ) 
});

Where RenderLayer is defined as an enum:

/// <summary>
/// Enumeration Constants to define the layers in <see cref="RenderOperationLayers"/>
/// </summary>
public enum RenderLayer
{
    /// <summary>
    /// The Axis Bands render layer, Z-order = 0
    /// </summary>
    AxisBands,

    /// <summary>
    /// The Axis Minor Gridlines render layer, Z-order = 1
    /// </summary>
    AxisMinorGridlines,

    /// <summary>
    /// The Axis Major Gridlines render layer, Z-order = 2
    /// </summary>
    AxisMajorGridlines,

    /// <summary>
    /// The RenderableSeries render layer, Z-order = 3
    /// </summary>
    RenderableSeries
}

Let me know if this helps!

Best regards,
Andrew

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0
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Hello, Andrew!
Thank you for your advice. I’ve applied this method, and have changed this part of code:

e.RenderContext.DrawLine(pen, StartPoint, new Point(StartPoint.X, CurrentPoint.Y));
                e.RenderContext.DrawEllipse(pen, brush, StartPoint, 4, 4);
                e.RenderContext.DrawEllipse(pen,brush,new Point(StartPoint.X,CurrentPoint.Y),2,2);
                e.RenderContext.DrawText(
                    new Rect(new Point(CurrentPoint.X - 20, CurrentPoint.Y - 20), new Size(100, 30)), Colors.Red, 10,
                    "Delta TVD:" + Math.Round(Geomodel.DeltaTVD + deltaTVD, 2));

To this:

e.RenderContext.Layers[RenderLayer.AxisMajorGridlines].Enqueue(() => e.RenderContext.DrawLine(pen, StartPoint, new Point(StartPoint.X, CurrentPoint.Y)));
                e.RenderContext.Layers[RenderLayer.AxisMajorGridlines].Enqueue(() => e.RenderContext.DrawEllipse(pen, brush, StartPoint, 4, 4));
                e.RenderContext.Layers[RenderLayer.AxisMajorGridlines].Enqueue(() => e.RenderContext.DrawEllipse(pen, brush, new Point(StartPoint.X, CurrentPoint.Y), 2, 2));
                e.RenderContext.Layers[RenderLayer.AxisMajorGridlines].Enqueue(() => e.RenderContext.DrawText(
                    new Rect(new Point(CurrentPoint.X - 20, CurrentPoint.Y - 20), new Size(100, 30)), Colors.Red, 10,
                    "Delta TVD:" + Math.Round(Geomodel.DeltaTVD + deltaTVD, 2)));
                e.RenderContext.Layers.Flush();

The image that is drawn with render context is situated under annotaions now, but above renderable series (blue line on attached img 1). I need to put this image (thin red line) under renderable series too.
P.S. I have tried all RenderLayers in RenderContext.Layers[].

Images
  • Andrew
    Ahh shoot. I have reviewed the code and the render layers are flushed before the RenderableSeries are drawn. Which means ... the approach I suggested will not work.At the moment the only way to place some UI below the RenderableSeries is to use the Annotations API and set AnnotationBase.AnnotationCanvas = BelowChart.Sorry, we cannot help at the moment without a big code change in SciChart
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