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254 lines (210 loc) · 11.4 KB
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using ProjNet.CoordinateSystems;
using ProjNet.CoordinateSystems.Transformations;
using SharpMap.Layers;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace WinFormSamples
{
static class LayerTools
{
private static ICoordinateTransformation _dhdn2Towgs84;
private static ICoordinateTransformation _wgs84ToGoogle;
private static ICoordinateTransformation _googletowgs84;
/// <summary>
/// Wgs84 to Google Mercator Coordinate Transformation
/// </summary>
public static ICoordinateTransformation Wgs84toGoogleMercator
{
get
{
if (_wgs84ToGoogle == null)
{
CoordinateSystemFactory csFac = new ProjNet.CoordinateSystems.CoordinateSystemFactory();
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
GeographicCoordinateSystem wgs84 = csFac.CreateGeographicCoordinateSystem(
"WGS 84", AngularUnit.Degrees, HorizontalDatum.WGS84, PrimeMeridian.Greenwich,
new AxisInfo("north", AxisOrientationEnum.North), new AxisInfo("east", AxisOrientationEnum.East));
List<ProjectionParameter> parameters = new List<ProjectionParameter>();
parameters.Add(new ProjectionParameter("semi_major", 6378137.0));
parameters.Add(new ProjectionParameter("semi_minor", 6378137.0));
parameters.Add(new ProjectionParameter("latitude_of_origin", 0.0));
parameters.Add(new ProjectionParameter("central_meridian", 0.0));
parameters.Add(new ProjectionParameter("scale_factor", 1.0));
parameters.Add(new ProjectionParameter("false_easting", 0.0));
parameters.Add(new ProjectionParameter("false_northing", 0.0));
IProjection projection = csFac.CreateProjection("Google Mercator", "mercator_1sp", parameters);
ProjectedCoordinateSystem epsg900913 = csFac.CreateProjectedCoordinateSystem(
"Google Mercator", wgs84, projection, LinearUnit.Metre, new AxisInfo("East", AxisOrientationEnum.East),
new AxisInfo("North", AxisOrientationEnum.North));
((CoordinateSystem)epsg900913).DefaultEnvelope = new[] { -20037508.342789, -20037508.342789, 20037508.342789, 20037508.342789 };
_wgs84ToGoogle = ctFac.CreateFromCoordinateSystems(wgs84, epsg900913);
}
return _wgs84ToGoogle;
}
}
/// <summary>
/// Wgs84 to Google Mercator Coordinate Transformation
/// </summary>
public static ICoordinateTransformation Dhdn2ToWgs84
{
get
{
if (_dhdn2Towgs84 == null)
{
CoordinateSystemFactory csFac = new ProjNet.CoordinateSystems.CoordinateSystemFactory();
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
GeographicCoordinateSystem wgs84 = csFac.CreateGeographicCoordinateSystem(
"WGS 84", AngularUnit.Degrees, HorizontalDatum.WGS84, PrimeMeridian.Greenwich,
new AxisInfo("north", AxisOrientationEnum.North), new AxisInfo("east", AxisOrientationEnum.East));
List<ProjectionParameter> parameters = new List<ProjectionParameter>();
parameters.Add(new ProjectionParameter("semi_major", 6378137.0));
parameters.Add(new ProjectionParameter("semi_minor", 6378137.0));
parameters.Add(new ProjectionParameter("latitude_of_origin", 0.0));
parameters.Add(new ProjectionParameter("central_meridian", 0.0));
parameters.Add(new ProjectionParameter("scale_factor", 1.0));
parameters.Add(new ProjectionParameter("false_easting", 0.0));
parameters.Add(new ProjectionParameter("false_northing", 0.0));
IProjection projection = csFac.CreateProjection("Google Mercator", "mercator_1sp", parameters);
ProjectedCoordinateSystem epsg900913 = csFac.CreateProjectedCoordinateSystem(
"Google Mercator", wgs84, projection, LinearUnit.Metre, new AxisInfo("East", AxisOrientationEnum.East),
new AxisInfo("North", AxisOrientationEnum.North));
_dhdn2Towgs84 = ctFac.CreateFromCoordinateSystems(wgs84, epsg900913);
}
return _dhdn2Towgs84;
}
}
public static ICoordinateTransformation GoogleMercatorToWgs84
{
get
{
if (_dhdn2Towgs84 == null)
{
CoordinateSystemFactory csFac = new ProjNet.CoordinateSystems.CoordinateSystemFactory();
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
GeographicCoordinateSystem wgs84 = csFac.CreateGeographicCoordinateSystem(
"WGS 84", AngularUnit.Degrees, HorizontalDatum.WGS84, PrimeMeridian.Greenwich,
new AxisInfo("north", AxisOrientationEnum.North), new AxisInfo("east", AxisOrientationEnum.East));
List<ProjectionParameter> parameters = new List<ProjectionParameter>();
parameters.Add(new ProjectionParameter("semi_major", 6378137.0));
parameters.Add(new ProjectionParameter("semi_minor", 6378137.0));
parameters.Add(new ProjectionParameter("latitude_of_origin", 0.0));
parameters.Add(new ProjectionParameter("central_meridian", 0.0));
parameters.Add(new ProjectionParameter("scale_factor", 1.0));
parameters.Add(new ProjectionParameter("false_easting", 0.0));
parameters.Add(new ProjectionParameter("false_northing", 0.0));
IProjection projection = csFac.CreateProjection("Google Mercator", "mercator_1sp", parameters);
ProjectedCoordinateSystem epsg900913 = csFac.CreateProjectedCoordinateSystem(
"Google Mercator", wgs84, projection, LinearUnit.Metre, new AxisInfo("East", AxisOrientationEnum.East),
new AxisInfo("North", AxisOrientationEnum.North));
_googletowgs84 = ctFac.CreateFromCoordinateSystems(epsg900913, wgs84);
}
return _googletowgs84;
}
}
public static LabelLayer CreateLabelLayer(VectorLayer originalLayer, string labelColumnName)
{
SharpMap.Layers.LabelLayer labelLayer = new SharpMap.Layers.LabelLayer(originalLayer.LayerName + ":Labels");
labelLayer.DataSource = originalLayer.DataSource;
labelLayer.LabelColumn = labelColumnName;
labelLayer.Style.CollisionDetection = true;
labelLayer.Style.CollisionBuffer = new SizeF(10F, 10F);
labelLayer.LabelFilter = SharpMap.Rendering.LabelCollisionDetection.ThoroughCollisionDetection;
labelLayer.Style.Offset = new PointF(0, -5F);
labelLayer.MultipartGeometryBehaviour = SharpMap.Layers.LabelLayer.MultipartGeometryBehaviourEnum.CommonCenter;
labelLayer.Style.Font = new Font(FontFamily.GenericSansSerif, 12);
labelLayer.MaxVisible = originalLayer.MaxVisible;
labelLayer.MinVisible = originalLayer.MinVisible;
labelLayer.Style.Halo = new Pen(Color.White, 2);
labelLayer.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
labelLayer.CoordinateTransformation = originalLayer.CoordinateTransformation;
return labelLayer;
}
private static readonly Random Rnd = new Random();
public static Color GetRandomColor()
{
return Color.FromArgb(Rnd.Next(0, 127), Rnd.Next(0, 255), Rnd.Next(0, 255), Rnd.Next(0, 255));
}
public static Boolean GetRandomBoolean()
{
return Rnd.Next(0, 2) == 1;
}
public static Brush GetRandomBrush()
{
return new SolidBrush(GetRandomColor());
}
public static Pen GetRandomPen()
{
return GetRandomPen(1, 4);
}
/// <summary>
/// Generates a random symbol.
/// </summary>
/// <returns></returns>
public static Bitmap GetRandomSymbol()
{
var s = Rnd.Next(4, 12);
var f = new Font("WingDings", 2 * s, GraphicsUnit.Pixel);
var bmp = new Bitmap(2 * s + 2, 2 * s + 2, PixelFormat.Format32bppArgb);
using (var g = Graphics.FromImage(bmp))
{
g.Clear(Color.Transparent);
g.DrawString(new string(Convert.ToChar((byte)Rnd.Next(15, 127)), 1), f, GetRandomBrush(), new PointF(s, s),
new StringFormat
{ Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
}
return bmp;
}
public static SharpMap.Styles.VectorStyle GetRandomVectorStyle()
{
return new SharpMap.Styles.VectorStyle
{
EnableOutline = GetRandomBoolean(),
Outline = GetRandomPen(3, 7),
Line = GetRandomPen(1, 4),
Fill = GetRandomBrush(),
Symbol = GetRandomSymbol(),
//SymbolRotation = Rnd.Next(0, 359),
};
}
private static Pen GetRandomPen(int min, int max)
{
var p = new Pen(GetRandomColor(), Rnd.Next(min, max));
p.LineJoin = LineJoin.MiterClipped;
p.MiterLimit = 2f;
return p;
}
public static SharpMap.Map GetMapForProviders(IEnumerable<SharpMap.Data.Providers.IProvider> providers)
{
var m = new SharpMap.Map();
foreach (var provider in providers)
{
var l = new VectorLayer(provider.ConnectionID, provider)
{
Style = GetRandomVectorStyle(),
IsQueryEnabled = true
};
if (provider.GetFeatureCount() > 50000)
m.BackgroundLayer.Add(AsyncLayerProxyLayer.Create(l, new Size(256, 128)));
else
m.Layers.Add(l);
if (provider.GetFeatureCount() < 50000)
{
var ll = new LabelLayer("Label " + provider.ConnectionID);
ll.DataSource = provider;
provider.Open();
var f = provider.GetFeature(1);
provider.Close();
ll.LabelColumn = f.Table.Columns[0].ColumnName;
ll.Style.CollisionDetection = false;
ll.Style.IgnoreLength = true;
m.Layers.Add(ll);
}
}
m.ZoomToExtents();
return m;
}
}
}
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