private VectorTileLayer ProcessPolygonTile(ISpatialDataSource spatialLayer, int tileX, int tileY, int zoom)
{
int tileSize = TileSize;
RectangleD tileBounds = TileUtil.GetTileLatLonBounds(tileX, tileY, zoom, tileSize);
//create a buffer around the tileBounds
tileBounds.Inflate(tileBounds.Width * 0.05, tileBounds.Height * 0.05);
int simplificationFactor = Math.Min(10, Math.Max(1, SimplificationPixelThreshold));
System.Drawing.Point tilePixelOffset = new System.Drawing.Point((tileX * tileSize), (tileY * tileSize));
using (IEnumerator <ISpatialData> data = spatialLayer.GetData(new BoundingBox()
{
MinX = tileBounds.Left,
MinY = tileBounds.Top,
MaxX = tileBounds.Right,
MaxY = tileBounds.Bottom
}))
{
GeometryAlgorithms.ClipBounds clipBounds = new GeometryAlgorithms.ClipBounds()
{
XMin = -20,
YMin = -20,
XMax = tileSize + 20,
YMax = tileSize + 20
};
System.Drawing.Point[] pixelPoints = new System.Drawing.Point[1024];
System.Drawing.Point[] simplifiedPixelPoints = new System.Drawing.Point[1024];
PointD[] pointsBuffer = new PointD[1024];
List <System.Drawing.Point> clippedPolygon = new List <System.Drawing.Point>();
VectorTileLayer tileLayer = new VectorTileLayer();
tileLayer.Extent = (uint)tileSize;
tileLayer.Version = 2;
tileLayer.Name = spatialLayer.Name;
while (data.MoveNext())
{
ISpatialData spatialData = data.Current;
VectorTileFeature feature = new VectorTileFeature()
{
Id = spatialData.Id,
Geometry = new List <List <Coordinate> >(),
Attributes = new List <AttributeKeyValue>(),
GeometryType = Tile.GeomType.Polygon
};
//get the point data
var recordPoints = spatialData.Geometry;
int partIndex = 0;
foreach (PointD[] points in recordPoints)
{
//convert to pixel coordinates;
if (pixelPoints.Length < points.Length)
{
pixelPoints = new System.Drawing.Point[points.Length + 10];
simplifiedPixelPoints = new System.Drawing.Point[points.Length + 10];
}
for (int n = 0; n < points.Length; ++n)
{
Int64 x, y;
TileUtil.LLToPixel(points[n], zoom, out x, out y, tileSize);
pixelPoints[n].X = (int)(x - tilePixelOffset.X);
pixelPoints[n].Y = (int)(y - tilePixelOffset.Y);
}
int outputCount = 0;
SimplifyPointData(pixelPoints, null, points.Length, simplificationFactor, simplifiedPixelPoints, null, ref pointsBuffer, ref outputCount);
if (outputCount > 1)
{
GeometryAlgorithms.PolygonClip(simplifiedPixelPoints, outputCount, clipBounds, clippedPolygon);
if (clippedPolygon.Count > 0)
{
//output the clipped polygon
List <Coordinate> lineString = new List <Coordinate>();
feature.Geometry.Add(lineString);
for (int i = clippedPolygon.Count - 1; i >= 0; --i)
{
lineString.Add(new Coordinate(clippedPolygon[i].X, clippedPolygon[i].Y));
}
}
}
++partIndex;
}
//add the record attributes
foreach (var keyValue in spatialData.Attributes)
{
feature.Attributes.Add(new AttributeKeyValue(keyValue.Key, keyValue.Value));
}
if (feature.Geometry.Count > 0)
{
tileLayer.VectorTileFeatures.Add(feature);
}
}
return(tileLayer);
}
}
private VectorTileLayer ProcessPointTile(ISpatialDataSource spatialLayer, int tileX, int tileY, int zoom)
{
int tileSize = TileSize;
RectangleD tileBounds = TileUtil.GetTileLatLonBounds(tileX, tileY, zoom, tileSize);
//create a buffer around the tileBounds
tileBounds.Inflate(tileBounds.Width * 0.05, tileBounds.Height * 0.05);
int simplificationFactor = Math.Min(10, Math.Max(1, SimplificationPixelThreshold));
System.Drawing.Point tilePixelOffset = new System.Drawing.Point((tileX * tileSize), (tileY * tileSize));
using (IEnumerator <ISpatialData> data = spatialLayer.GetData(new BoundingBox()
{
MinX = tileBounds.Left,
MinY = tileBounds.Top,
MaxX = tileBounds.Right,
MaxY = tileBounds.Bottom
}))
{
GeometryAlgorithms.ClipBounds clipBounds = new GeometryAlgorithms.ClipBounds()
{
XMin = -20,
YMin = -20,
XMax = tileSize + 20,
YMax = tileSize + 20
};
VectorTileLayer tileLayer = new VectorTileLayer();
tileLayer.Extent = (uint)tileSize;
tileLayer.Version = 2;
tileLayer.Name = spatialLayer.Name;
while (data.MoveNext())
{
ISpatialData spatialData = data.Current;
VectorTileFeature feature = new VectorTileFeature()
{
Id = spatialData.Id,
Geometry = new List <List <Coordinate> >(),
Attributes = new List <AttributeKeyValue>(),
GeometryType = Tile.GeomType.Point
};
//output the pixel coordinates
List <Coordinate> coordinates = new List <Coordinate>();
var recordPoints = spatialData.Geometry;
foreach (PointD[] points in recordPoints)
{
for (int n = 0; n < points.Length; ++n)
{
Int64 x, y;
TileUtil.LLToPixel(points[n], zoom, out x, out y, tileSize);
coordinates.Add(new Coordinate((int)(x - tilePixelOffset.X), (int)(y - tilePixelOffset.Y)));
}
}
if (coordinates.Count > 0)
{
feature.Geometry.Add(coordinates);
}
//add the record attributes
foreach (var keyValue in spatialData.Attributes)
{
feature.Attributes.Add(new AttributeKeyValue(keyValue.Key, keyValue.Value));
}
if (feature.Geometry.Count > 0)
{
tileLayer.VectorTileFeatures.Add(feature);
}
}
return(tileLayer);
}
}
private VectorTileLayer ProcessLineStringTile(ISpatialDataSource spatialLayer, int tileX, int tileY, int zoom)
{
int tileSize = TileSize;
RectangleD tileBounds = TileUtil.GetTileLatLonBounds(tileX, tileY, zoom, tileSize);
//create a buffer around the tileBounds
tileBounds.Inflate(tileBounds.Width * 0.05, tileBounds.Height * 0.05);
int simplificationFactor = Math.Min(10, Math.Max(1, SimplificationPixelThreshold));
System.Drawing.Point tilePixelOffset = new System.Drawing.Point((tileX * tileSize), (tileY * tileSize));
using (IEnumerator <ISpatialData> data = spatialLayer.GetData(new BoundingBox()
{
MinX = tileBounds.Left,
MinY = tileBounds.Top,
MaxX = tileBounds.Right,
MaxY = tileBounds.Bottom
}))
{
GeometryAlgorithms.ClipBounds clipBounds = new GeometryAlgorithms.ClipBounds()
{
XMin = -20,
YMin = -20,
XMax = tileSize + 20,
YMax = tileSize + 20
};
bool outputMeasureValues = this.OutputMeasureValues && spatialLayer.HasMeasures;
System.Drawing.Point[] pixelPoints = new System.Drawing.Point[1024];
System.Drawing.Point[] simplifiedPixelPoints = new System.Drawing.Point[1024];
double[] simplifiedMeasures = new double[1024];
PointD[] pointsBuffer = new PointD[1024];
VectorTileLayer tileLayer = new VectorTileLayer();
tileLayer.Extent = (uint)tileSize;
tileLayer.Version = 2;
tileLayer.Name = spatialLayer.Name;
//int index = 0;
//foreach (int index in indicies)
while (data.MoveNext())
{
ISpatialData spatialData = data.Current;
VectorTileFeature feature = new VectorTileFeature()
{
Id = spatialData.Id,
Geometry = new List <List <Coordinate> >(),
Attributes = new List <AttributeKeyValue>()
};
//get the point data
var recordPoints = spatialData.Geometry;
List <double[]> recordMeasures = null;
if (outputMeasureValues)
{
recordMeasures = spatialData.Measures;
}
List <double> outputMeasures = new List <double>();
int partIndex = 0;
foreach (PointD[] points in recordPoints)
{
double[] measures = recordMeasures != null ? recordMeasures[partIndex] : null;
//convert to pixel coordinates;
if (pixelPoints.Length < points.Length)
{
pixelPoints = new System.Drawing.Point[points.Length + 10];
simplifiedPixelPoints = new System.Drawing.Point[points.Length + 10];
simplifiedMeasures = new double[points.Length + 10];
}
for (int n = 0; n < points.Length; ++n)
{
Int64 x, y;
TileUtil.LLToPixel(points[n], zoom, out x, out y, tileSize);
pixelPoints[n].X = (int)(x - tilePixelOffset.X);
pixelPoints[n].Y = (int)(y - tilePixelOffset.Y);
}
int outputCount = 0;
SimplifyPointData(pixelPoints, measures, points.Length, simplificationFactor, simplifiedPixelPoints, simplifiedMeasures, ref pointsBuffer, ref outputCount);
//output count may be zero for short records at low zoom levels as
//the pixel coordinates wil be a single point after simplification
if (outputCount > 0)
{
List <int> clippedPoints = new List <int>();
List <int> parts = new List <int>();
if (outputMeasureValues)
{
List <double> clippedMeasures = new List <double>();
GeometryAlgorithms.PolyLineClip(simplifiedPixelPoints, outputCount, clipBounds, clippedPoints, parts, simplifiedMeasures, clippedMeasures);
outputMeasures.AddRange(clippedMeasures);
}
else
{
GeometryAlgorithms.PolyLineClip(simplifiedPixelPoints, outputCount, clipBounds, clippedPoints, parts);
}
if (parts.Count > 0)
{
//output the clipped polyline
for (int n = 0; n < parts.Count; ++n)
{
int index1 = parts[n];
int index2 = n < parts.Count - 1 ? parts[n + 1] : clippedPoints.Count;
List <Coordinate> lineString = new List <Coordinate>();
feature.GeometryType = Tile.GeomType.LineString;
feature.Geometry.Add(lineString);
//clipped points store separate x/y pairs so there will be two values per measure
for (int i = index1; i < index2; i += 2)
{
lineString.Add(new Coordinate(clippedPoints[i], clippedPoints[i + 1]));
}
}
}
}
++partIndex;
}
//add the record attributes
foreach (var keyValue in spatialData.Attributes)
{
feature.Attributes.Add(new AttributeKeyValue(keyValue.Key, keyValue.Value));
}
if (outputMeasureValues)
{
string s = Newtonsoft.Json.JsonConvert.SerializeObject(outputMeasures, new DoubleFormatConverter(4));
feature.Attributes.Add(new AttributeKeyValue(this.MeasuresAttributeName, s));
}
if (feature.Geometry.Count > 0)
{
tileLayer.VectorTileFeatures.Add(feature);
}
}
return(tileLayer);
}
}