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?
- Vyacheslav Seredkin asked 9 years ago
- last edited 9 years ago
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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
- Andrew Burnett-Thompson answered 9 years ago
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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[].
- Vyacheslav Seredkin answered 9 years ago
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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