/// <summary>
/// Method to place the street direction symbols
/// </summary>
/// <param name="map"></param>
/// <param name="lineString"></param>
/// <param name="graphics"></param>
private void OnRenderInternal(SharpMap.MapViewport map, GeoAPI.Geometries.ILineString lineString,
System.Drawing.Graphics graphics)
{
var length = lineString.Length;
var lil = new NetTopologySuite.LinearReferencing.LengthIndexedLine(lineString);
if (length < RepeatInterval + ArrowLength)
{
var start = System.Math.Max(0, (length - ArrowLength) / 2);
var end = System.Math.Min(length, (length + ArrowLength) / 2);
var arrow = (GeoAPI.Geometries.ILineString)lil.ExtractLine(start, end);
RenderArrow(map, graphics, arrow);
return;
}
var numArrows = (int)((lineString.Length - ArrowLength) / RepeatInterval);
var offset = (lineString.Length - numArrows * RepeatInterval - ArrowLength) * 0.5;
while (offset + ArrowLength < lineString.Length)
{
var arrow = (GeoAPI.Geometries.ILineString)lil.ExtractLine(offset, offset + ArrowLength);
RenderArrow(map, graphics, arrow);
offset += RepeatInterval;
}
}
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);
}
public override void Begin(System.Drawing.Graphics g, SharpMap.MapViewport map, int aproximateNumberOfGeometries)
{
base.Begin(g, map, aproximateNumberOfGeometries);
//Adjust Arrow cap
var size = (float)(ArrowLength / 5 / map.PixelWidth);
ArrowPen.CustomEndCap = new System.Drawing.Drawing2D.AdjustableArrowCap(size, size);
}
/// <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);
}
public void Render(SharpMap.MapViewport map, GeoAPI.Geometries.ILineal geometry, System.Drawing.Graphics graphics)
{
if (geometry is GeoAPI.Geometries.IMultiLineString)
{
var mls = (GeoAPI.Geometries.IMultiLineString)geometry;
for (var i = 0; i < mls.Count; i++)
{
OnRenderInternal(map, (GeoAPI.Geometries.ILineString)mls.GetGeometryN(i), graphics);
}
return;
}
OnRenderInternal(map, (GeoAPI.Geometries.ILineString)geometry, graphics);
}
public override void Begin(System.Drawing.Graphics g, SharpMap.MapViewport map, int aproximateNumberOfGeometries)
{
base.Begin(g, map, aproximateNumberOfGeometries);
_oldRenderOrigin = g.RenderingOrigin;
}
public override void End(System.Drawing.Graphics g, SharpMap.MapViewport map)
{
g.RenderingOrigin = _oldRenderOrigin;
}
