protected override void OnRenderInternal(SharpMap.MapViewport map, GeoAPI.Geometries.IPolygon polygon, System.Drawing.Graphics g)
{
var pt = polygon.Centroid;
g.RenderingOrigin =
System.Drawing.Point.Truncate(map.WorldToImage(pt.Coordinate));
base.OnRenderInternal(map, polygon, g);
}
/// <summary>
/// Method to render the arrow
/// </summary>
/// <param name="map">The map</param>
/// <param name="graphics">The graphics object</param>
/// <param name="arrow">The arrow</param>
private void RenderArrow(SharpMap.MapViewport map, System.Drawing.Graphics graphics, GeoAPI.Geometries.ILineString arrow)
{
var pts = new System.Drawing.PointF[arrow.Coordinates.Length];
for (var i = 0; i < pts.Length; i++)
{
pts[i] = map.WorldToImage(arrow.GetCoordinateN(i));
}
graphics.DrawLines(ArrowPen, pts);
}