Implementing User Defined Thumb Styles With LEADTOOLS Annotations

public class AnnTriangleThumbStyle : AnnThumbStyle 
{ 
   protected override AnnThumbStyle Create() 
   { 
      return new AnnTriangleThumbStyle(); 
   } 
             
   protected override void AddPath(System.Drawing.Drawing2D.GraphicsPath path, LeadRectD rect) 
   { 
      if (path != null) 
      { 
         // Add our triangle 
         float left = (float)rect.Left; 
         float right = (float)rect.Right; 
         float width = (right - left) / 2; 
         float top = (float)rect.Top; 
         float bottom = (float)rect.Bottom; 
             
         path.AddLine(left, bottom, left + width, top); 
         path.AddLine(left + width, top, right, bottom); 
         path.AddLine(right, bottom, left, bottom); 
         path.CloseFigure(); 
      } 
   } 
} 
             

// Set our renderer 
             
// Get the current polyline renderer (we need to use some of the properties we are not changing) 
IAnnObjectRenderer polylineRenderer = annotations.AutomationManager.RenderingEngine.Renderers[AnnObject.PolylineObjectId]; 
             
// Create the new renderer 
IAnnObjectRenderer renderer = new AnnPolylineObjectRenderer(); 
// Use the existing label renderer. It is not being changed 
renderer.LabelRenderer = polylineRenderer.LabelRenderer; 
             
// Now, use the new triangle thumbs: 
             
// Change the location thumb style 
AnnTriangleThumbStyle locationThumb = new AnnTriangleThumbStyle(); 
locationThumb.Size = LeadSizeD.Create(72 * 2, 72 * 2); 
locationThumb.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("black"), LeadLengthD.Create(1)); 
locationThumb.Fill = AnnSolidColorBrush.Create("#7F0000FF"); 
renderer.LocationsThumbStyle = locationThumb; 
             
// Change the rotation center thumb style 
AnnTriangleThumbStyle rotateCenterThumb = new AnnTriangleThumbStyle(); 
rotateCenterThumb.Size = LeadSizeD.Create(72, 72); 
rotateCenterThumb.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("black"), LeadLengthD.Create(1)); 
rotateCenterThumb.Fill = AnnSolidColorBrush.Create("#EFFF0000"); 
renderer.RotateCenterThumbStyle = rotateCenterThumb; 
             
// Change the Rotation gripper thumb style 
AnnTriangleThumbStyle rotateGripperThumb = new AnnTriangleThumbStyle(); 
rotateGripperThumb.Size = LeadSizeD.Create(72 * 2, 72 * 2); 
rotateGripperThumb.Stroke = AnnStroke.Create(AnnSolidColorBrush.Create("black"), LeadLengthD.Create(1)); 
rotateGripperThumb.Fill = AnnSolidColorBrush.Create("#3F00FF00"); 
renderer.RotateGripperThumbStyle = rotateGripperThumb; 
             
annotations.AutomationManager.RenderingEngine.Renderers[AnnTriangleObject.MyId] = renderer;