public void BufferAroundLine()
{
var form = new Form {
BackColor = Color.White, Size = new Size(500, 200)
};
form.Paint += delegate
{
Graphics g = form.CreateGraphics();
List <ICoordinate> vertices = new List <ICoordinate>();
vertices.Add(new Coordinate(0, 4));
vertices.Add(new Coordinate(40, 15));
vertices.Add(new Coordinate(50, 50));
vertices.Add(new Coordinate(100, 62));
vertices.Add(new Coordinate(240, 45));
vertices.Add(new Coordinate(350, 5));
IGeometry geometry = new LineString(vertices.ToArray());
g.DrawLines(new Pen(Color.Blue, 1), GetPoints(geometry));
BufferOp bufferOp = new BufferOp(geometry);
bufferOp.EndCapStyle = BufferStyle.CapButt;
bufferOp.QuadrantSegments = 0;
IGeometry bufGeo = bufferOp.GetResultGeometry(5);
bufGeo = bufGeo.Union(geometry);
g.FillPolygon(new SolidBrush(Color.Pink), GetPoints(bufGeo));
};
WindowsFormsTestHelper.ShowModal(form);
}
public static IGeometry BufferWithParams(IGeometry g, Double?distance,
int?quadrantSegments, int?capStyle, int?joinStyle,
Double?mitreLimit)
{
double dist = 0;
if (distance != null)
{
dist = distance.Value;
}
var bufParams = new BufferParameters();
if (quadrantSegments != null)
{
bufParams.QuadrantSegments = quadrantSegments.Value;
}
if (capStyle != null)
{
bufParams.EndCapStyle = (EndCapStyle)capStyle.Value;
}
if (joinStyle != null)
{
bufParams.JoinStyle = (JoinStyle)joinStyle.Value;
}
if (mitreLimit != null)
{
bufParams.MitreLimit = mitreLimit.Value;
}
return(BufferOp.Buffer(g, dist, bufParams));
}
public static IGeometry LogoBuffer(IGeometry g, double distance)
{
var lines = LogoLines(g);
var bufParams = new BufferParameters();
bufParams.EndCapStyle = EndCapStyle.Square;
return(BufferOp.Buffer(lines, distance, bufParams));
}
public static Geometry bufferMitredJoin(Geometry g, double distance)
{
var bufParams = new BufferParameters();
bufParams.JoinStyle = JoinStyle.Mitre;
return(BufferOp.Buffer(g, distance, bufParams));
}
public static IGeometry SingleSidedBuffer(IGeometry geom, double distance)
{
var bufParams = new BufferParameters {
IsSingleSided = true
};
return(BufferOp.Buffer(geom, distance, bufParams));
}
public static Geometry BufferWithSimplify(Geometry g, double?distance,
double?simplifyFactor)
{
double dist = 0;
if (distance != null)
{
dist = distance.Value;
}
var bufParams = new BufferParameters();
if (simplifyFactor != null)
{
bufParams.SimplifyFactor = simplifyFactor.Value;
}
return(BufferOp.Buffer(g, dist, bufParams));
}
/// <summary>
/// Given a linestring, a polygon feature class, and a buffer distance (given in feet), returns the length of the linestring contained within the buffer distance of a polygon in the feature class.
/// </summary>
/// <param name="lineGeometry"></param>
/// <param name="polygonsToCheck"></param>
/// <param name="bufferDistance"></param>
/// <returns></returns>
public static double CalculateLengthOfLineWithinPolygon(Geometry lineGeometry, IEnumerable <Geometry> polygonsToCheck, int bufferDistance)
{
if (!(bufferDistance > 0))
{
return(CalculateLengthOfLineWithinPolygon(lineGeometry, polygonsToCheck));
}
var bufferedLine = BufferOp.Buffer(lineGeometry, bufferDistance);
var intersectingPolygon = polygonsToCheck.FirstOrDefault(x => x.Intersects(bufferedLine));
if (intersectingPolygon == null)
{
return(0);
}
// buffer the geometry that intersects and calculate its intersection with the original line
var bufferedIntersectingPolygon = BufferOp.Buffer(intersectingPolygon, bufferDistance);
return(bufferedIntersectingPolygon.Intersection(lineGeometry).Length);
}
///<summary>
/// Returns a buffer region around this Geometry having the given width.
/// The buffer of a Geometry is the Minkowski sum of the Geometry with
/// a disc of radius distance.
///</summary>
///<param name="distance">The width of the buffer, interpreted according to the PrecisionModel of the
///Geometry.</param>
///<returns>
///Returns all points whose distance from this Geometry are less than or equal to distance.
///</returns>
public virtual Geometry Buffer(double distance)
{
return BufferOp.GetBuffer(this, distance);
}
