/// <summary>
/// 切割矢量并输出成bitmap
/// </summary>
/// <param name="featureCollection"></param>
/// <param name="outputDir"></param>
public void Output(FeatureCollection featureCollection, string outputDir)
{
var _tileDictionary = _vectorPyramid.TileDictionary;
int _tileSize = _vectorPyramid.Projection.TileSize;
//
foreach (int zoom in _tileDictionary.Keys)
{
var tileCollection = _tileDictionary[zoom];
foreach (var tile in tileCollection)
{
try
{
//
Bitmap bmp = new Bitmap(_tileSize, _tileSize);
Graphics g = Graphics.FromImage(bmp);
Pen pen = new Pen(Color.Black, 3);
//
for (int i = 0; i < featureCollection.Count; i++)
{
IFeature f = featureCollection[i];
//点
if (f.Geometry.OgcGeometryType == OgcGeometryType.Point)
{
Coordinate point = f.Geometry.Coordinate;
if (tile.Bound.PointInPolygon(point))
{
//2.2.1 计算点的像素坐标
Coordinate pixel = _vectorPyramid.Projection.LatlngToPoint(point, zoom);
//
double deltaX = pixel.X / _tileSize - tile.X;
double deltaY = pixel.Y / _tileSize - tile.Y;
int x = Convert.ToInt32(deltaX * _tileSize);
int y = Convert.ToInt32(deltaY * _tileSize);
g.DrawLine(pen, x, x, x, y);
}
continue;
}
//线
else if (f.Geometry.OgcGeometryType == OgcGeometryType.LineString)
{
//2.1瓦片裁剪道路
List <Coordinate> clipLine = CohenSutherland.GetIntersectedPolyline(f.Geometry.Coordinates, tile.Bound);
if (clipLine.Count == 0)
{
continue;
}
int x0 = -1000, y0 = -1000;
//2.2 绘制clipLine
foreach (Coordinate point in clipLine)
{
//2.2.1 计算点的像素坐标
Coordinate pixel = _vectorPyramid.Projection.LatlngToPoint(point, zoom);
//
double deltaX = pixel.X / _tileSize - tile.X;
double deltaY = pixel.Y / _tileSize - tile.Y;
int x = Convert.ToInt32(deltaX * _tileSize);
int y = Convert.ToInt32(deltaY * _tileSize);
if (x0 == -1000 && y0 == -1000)
{
x0 = x;
y0 = y;
continue;
}
else
{
g.DrawLine(pen, x0, y0, x, y);
x0 = x;
y0 = y;
}
}
}
//面
else if (f.Geometry.OgcGeometryType == OgcGeometryType.Polygon)
{
List <Coordinate> clipPolygon = SutherlandHodgman.GetIntersectedPolygon(f.Geometry.Coordinates, tile.Bound);
if (clipPolygon.Count < 3)
{
continue;
}
int x0 = -1000, y0 = -1000;
//2.2 绘制clipLine
foreach (Coordinate point in clipPolygon)
{
//2.2.1 计算点的像素坐标
Coordinate pixel = _vectorPyramid.Projection.LatlngToPoint(point, zoom);
//
double deltaX = pixel.X / _tileSize - tile.X;
double deltaY = pixel.Y / _tileSize - tile.Y;
int x = Convert.ToInt32(deltaX * _tileSize);
int y = Convert.ToInt32(deltaY * _tileSize);
if (x0 == -1000 && y0 == -1000)
{
x0 = x;
y0 = y;
continue;
}
else
{
g.DrawLine(pen, x0, y0, x, y);
x0 = x;
y0 = y;
}
}
}
}
//2.3 保存bmp到指定路径
if (!System.IO.Directory.Exists(outputDir + @"\" + zoom))
{
System.IO.Directory.CreateDirectory(outputDir + @"\" + zoom);
}
//根据geometry id存储，获取不到geometry的id，所以只能自定内部序号
bmp.Save(outputDir + @"\" + zoom + @"\" + tile.X + "_" + tile.Y + "_" + tile.Z + ".jpg");
}
catch
{
continue;
}
}
}
}
