public void TestLayer()
{
var map = new SharpMap.Map(new System.Drawing.Size(500, 500));
var gp = new SharpMap.Data.Providers.FeatureProvider(
new[]
{
Factory.CreatePolygon(
ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(0, 0),
new System.Drawing.SizeF(40, 30)),
new[]
{
ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(90, 55),
new System.Drawing.SizeF(40, 30)),
ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(77, 24),
new System.Drawing.SizeF(40, 30)),
ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(-80, 41),
new System.Drawing.SizeF(40, 30)),
ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(-45, -36),
new System.Drawing.SizeF(40, 30)),
})
});
var gl = new SharpMap.Layers.VectorLayer("GeometryLayer", gp);
map.Layers.Add(gl);
map.ZoomToExtents();
var mapimage = map.GetMap();
mapimage.Save("ellipse.png", System.Drawing.Imaging.ImageFormat.Png);
}
private static GeoAPI.Geometries.IPolygon ReadPolygon(byte[] geom, ref int idx, bool isLittleEndian, GeoAPI.Geometries.IGeometryFactory factory)
{
var nRings = ReadUInt32(geom, ref idx, isLittleEndian);
if (nRings < 1 || nRings > Int32.MaxValue / (2 * 8))
{
throw new ApplicationException("Currupt SpatialLite geom");
}
List <GeoAPI.Geometries.ILineString> lineStrings = new List <GeoAPI.Geometries.ILineString>();
for (int i = 0; i < nRings; i++)
{
lineStrings.Add(ReadLineString(geom, ref idx, isLittleEndian, factory));
}
List <GeoAPI.Geometries.ILinearRing> holes = null;
var shell = factory.CreateLinearRing(lineStrings[0].Coordinates);
if (lineStrings.Count > 1)
{
holes = new List <GeoAPI.Geometries.ILinearRing>();
for (int i = 1; i < lineStrings.Count; i++)
{
holes.Add(factory.CreateLinearRing(lineStrings[i].Coordinates));
}
}
return(factory.CreatePolygon(shell, holes == null ? null : holes.ToArray()));
}
