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199 lines (172 loc) · 9.35 KB
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namespace ExampleCodeSnippets
{
/// <summary>
/// Examples of creating spatial data
/// </summary>
public static class CreatingData
{
private static readonly System.Random _rng = new System.Random();
public static System.Random RandomNumberGenerator
{
get { return _rng; }
}
/// <summary>
/// Creates an array of random values in the given range [<paramref name="min"/>, <paramref name="max"/>].
/// </summary>
/// <param name="size">The length of the array, aka the number of values</param>
/// <param name="min">The lower bound.</param>
/// <param name="max">The upper bound.</param>
/// <returns>An array of random values</returns>
public static System.Double[] GetRandomOrdinates(System.Int32 size, System.Double min, System.Double max)
{
System.Double[] arr = new System.Double[size];
System.Double width = max - min;
for (System.Int32 i = 0; i < size; i++)
{
System.Double randomValue = _rng.NextDouble();
arr[i] = min + randomValue * width;
}
return arr;
}
/// <summary>
/// Creates a FeatureDataTable from arrays of x, y and z components
/// </summary>
/// <param name="xcomponents">an array of doubles representing the x ordinate values</param>
/// <param name="ycomponents">an array of doubles representing the y ordinate values</param>
/// <param name="zcomponents">an array of doubles representing the z ordinate values</param>
/// <returns></returns>
public static SharpMap.Data.FeatureDataTable CreatePointFeatureDataTableFromArrays(double[] xcomponents,
double[] ycomponents,
double[] zcomponents, double[] data = null)
{
var factory = new NetTopologySuite.Geometries.GeometryFactory();
var threedee = false;
if (zcomponents != null)
{
if (!(zcomponents.Length == ycomponents.Length && zcomponents.Length == xcomponents.Length))
throw new System.ApplicationException("Mismatched Array Lengths");
threedee = true;
}
else
{
if (ycomponents.Length != xcomponents.Length)
throw new System.ApplicationException("Mismatched Array Lengths");
}
var fdt = new SharpMap.Data.FeatureDataTable();
fdt.Columns.Add("TimeStamp", typeof (System.DateTime)); // add example timestamp attribute
if (data != null)
fdt.Columns.Add("Data", typeof(System.Double)); // add example timestamp attribute
for (var i = 0; i < xcomponents.Length; i++)
{
SharpMap.Data.FeatureDataRow fdr = fdt.NewRow();
fdr.Geometry = factory.CreatePoint(threedee
? new GeoAPI.Geometries.Coordinate(xcomponents[i], ycomponents[i], zcomponents[i])
: new GeoAPI.Geometries.Coordinate(xcomponents[i], ycomponents[i]));
fdr["TimeStamp"] = System.DateTime.Now; //set the timestamp property
if (data != null)
fdr["Data"] = data[i];
fdt.AddRow(fdr);
}
return fdt;
}
}
public static class ShapeFactory
{
public static GeoAPI.Geometries.ILinearRing CreateRectangle(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate leftTop, GeoAPI.Geometries.Coordinate rightBottom)
{
var pts = new[]
{
leftTop,
new GeoAPI.Geometries.Coordinate(rightBottom.X, leftTop.Y),
rightBottom,
new GeoAPI.Geometries.Coordinate(leftTop.X, rightBottom.Y),
leftTop
};
return factory.CreateLinearRing(pts);
}
public static GeoAPI.Geometries.ILinearRing CreateRectangle(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate center, System.Drawing.SizeF size)
{
var wh = new System.Drawing.SizeF(size.Width * 0.5f, size.Height * 0.5f);
var lt = new GeoAPI.Geometries.Coordinate(center.X - wh.Width, center.Y + wh.Height);
var rb = new GeoAPI.Geometries.Coordinate(center.X + wh.Width, center.Y - wh.Height);
return CreateRectangle(factory, lt, rb);
}
public static GeoAPI.Geometries.ILinearRing CreateEllipse(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate center, System.Drawing.SizeF size)
{
return CreateEllipse(factory, center, size, 12);
}
public static GeoAPI.Geometries.ILinearRing CreateEllipse(GeoAPI.Geometries.IGeometryFactory factory,
GeoAPI.Geometries.Coordinate center, System.Drawing.SizeF size, int segmentsPerQuadrant)
{
const double piHalf = System.Math.PI * 0.5d;
var step = piHalf / segmentsPerQuadrant;
var pts = new GeoAPI.Geometries.Coordinate[4 * segmentsPerQuadrant + 1];
var angle = 0d;
for (var i = 0; i < 4 * segmentsPerQuadrant; i++)
{
pts[i] = new GeoAPI.Geometries.Coordinate(center.X + System.Math.Cos(angle) * size.Width,
center.Y + System.Math.Sin(angle) * size.Height);
angle += step;
}
pts[pts.Length - 1] = pts[0];
return factory.CreateLinearRing(pts);
}
}
public class TestShapeFactory
{
public static readonly GeoAPI.Geometries.IGeometryFactory Factory =
new NetTopologySuite.Geometries.GeometryFactory(new NetTopologySuite.Geometries.PrecisionModel(1000));
[NUnit.Framework.Test]
public void TestRectangle()
{
var rect = ShapeFactory.CreateRectangle(Factory, new GeoAPI.Geometries.Coordinate(1, 2), new GeoAPI.Geometries.Coordinate(2, 1));
NUnit.Framework.Assert.AreEqual(rect.StartPoint, rect.EndPoint);
NUnit.Framework.Assert.AreEqual(4, rect.Length);
var rect2 = ShapeFactory.CreateRectangle(Factory, new GeoAPI.Geometries.Coordinate(1.5, 1.5), new System.Drawing.SizeF(1f, 1f));
NUnit.Framework.Assert.AreEqual(rect, rect2);
NUnit.Framework.Assert.AreEqual("LINEARRING (1 2, 2 2, 2 1, 1 1, 1 2)", rect.ToString());
}
[NUnit.Framework.Test]
public void TestEllipse()
{
var ell = ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(1, 1), new System.Drawing.SizeF(1, 1), 1);
NUnit.Framework.Assert.AreEqual(ell.StartPoint, ell.EndPoint);
NUnit.Framework.Assert.LessOrEqual(System.Math.Abs(4 * System.Math.Sqrt(2) - ell.Length), 0.00001d);
NUnit.Framework.Assert.AreEqual("LINEARRING (2 1, 1 2, 0 1, 1 0, 2 1)", ell.ToString());
var ell2 = ShapeFactory.CreateEllipse(Factory, new GeoAPI.Geometries.Coordinate(1, 1), new System.Drawing.SizeF(1, 1));
System.Console.WriteLine(ell2.ToString());
}
[NUnit.Framework.Test]
public void TestLayer()
{
var map = new SharpMap.Map(new System.Drawing.Size(500, 500));
var gp = new SharpMap.Data.Providers.GeometryProvider(
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);
}
}
}
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