Hi,Here's an example of how you could achieve this with a GraphicsLayer / FeatureLayer. It involves creating a unique value renderer with values from 0-360 and creating the same number of picture marker symbols, each rotated by one degree. Then assign the UVR to a graphics layer (in this cases I�??ve just added 100 graphics, each with an "Angle" property of between 0 and 360). If you weren't so concerned about each individual angle, you could use a ClassBreaksRenderer for ranges of angle values.
GraphicsLayer _graphicsLayer;
// Create an ImageBrush
ImageBrush simpleArrow = new ImageBrush();
simpleArrow.ImageSource = new BitmapImage(new Uri("pack://application:,,,/Images/SimpleArrow.png", UriKind.Absolute));
// Found an image on http://www.iconfinder.com/search/?q=simple+arrow
// Add an Ellipse Element & use the ImageBrush as the Fill for the Ellipse
Ellipse myEllipse = new Ellipse();
myEllipse.Fill = simpleArrow;
myEllipse.HorizontalAlignment = HorizontalAlignment.Center;
myEllipse.VerticalAlignment = VerticalAlignment.Center;
myEllipse.Width = 24;
myEllipse.Height = 24;
// Create a UniqueValueRenderer based on the Angle attribute/field in the underlying data
var renderer = new UniqueValueRenderer()
{
Field = "Angle",
};
// Create UniqueValueInfo objects for each integer value 0-360 and an associated PictureMarkerSymbol for each one, rotated to that value.
for (int i = 0; i < 361; i++)
{
// Rotate by the angle 0-360 and about the center of the 24x24 pixel image.
myEllipse.RenderTransform = new RotateTransform(i,12,12);
//Force a render
myEllipse.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
myEllipse.Arrange(new Rect(myEllipse.DesiredSize));
RenderTargetBitmap render = new RenderTargetBitmap(34, 34, 96, 96, PixelFormats.Default);
render.Render(myEllipse);
// Create a PictureMarkerSymbol
PictureMarkerSymbol pms = new PictureMarkerSymbol()
{
Source = render,
};
// Create the UniqueValueInfo
UniqueValueInfo uniqueValueInfo = new UniqueValueInfo()
{
Value = i,
Symbol = pms,
};
// Add the UniqueValueInfo to the Infos property on the renderer
renderer.Infos.Add(uniqueValueInfo);
}
// Create a new GraphicsLayer
_graphicsLayer = new GraphicsLayer();
// Create a instance of the Random class to generate random coordinate pairs.
Random random = new Random();
// Add graphics to a List<Graphic>
var graphicsList = new List<Graphic>();
for (int i = 0; i < 100; i++)
{
var x = (random.NextDouble() * 40000000) - 20000000;
var y = (random.NextDouble() * 40000000) - 20000000;
var graphic = new Graphic()
{
// assign each graphic a number 0, 1, 2 - we''ll use this to represent he color
Geometry = new MapPoint(x, y),
Attributes = { { "Angle", random.Next(0,361)} }
};
graphicsList.Add(graphic);
}
// Set the renderer
_graphicsLayer.Renderer = renderer;
// Bulk add of graphics - more efficient than adding one graphic at a time
_graphicsLayer.Graphics.AddRange(graphicsList);
// Add layer to Map
MyMap.Layers.Add(_graphicsLayer);
Hope that helpsCheersMike
