private void WriteFeature(XFeature feature, BinaryWriter bw)
{
if (feature.Spatial is XPointSpatial)
{
((XPointSpatial)feature.Spatial).Centroid.WriteVertex(bw);
}
if (feature.Spatial is XLineSpatial)
{
WriteMultipleVertexes(((XLineSpatial)feature.Spatial).
AllVertexes, bw);
}
if (feature.Spatial is XPolygonSpatial)
{
WriteMultipleVertexes(((XPolygonSpatial)feature.Spatial).
AllVertexes, bw);
}
WriteAttribute(feature.Attribute, bw);
}
public void AddFeature(XFeature feature)
{
Features.Add(feature);
}
public List <XLayer> ReadJSONFile(string filename)
{
List <XLayer> layers = new List <XLayer>();
StreamReader sr = new StreamReader(filename, Encoding.UTF8);
Newtonsoft.Json.Linq.JObject o = Newtonsoft.Json.Linq.JObject.Parse(sr.ReadToEnd()); //读入一个json文件
Newtonsoft.Json.Linq.JToken features = o["features"]; //读取所有空间对象数组
List <Newtonsoft.Json.Linq.JToken> flst = features.ToList();
List <XField> fields = new List <XField>(); /*ReadFields(mfh.FieldCount, br);*/
XLayer pointlayer = new XLayer(filename, SHAPETYPE.point, null, fields);
XLayer linelayer = new XLayer(filename, SHAPETYPE.line, null, fields);
XLayer polygonlayer = new XLayer(filename, SHAPETYPE.polygon, null, fields);
double maxx = Double.MinValue;
double minx = Double.MaxValue;
double maxy = Double.MinValue;
double miny = Double.MaxValue;
for (int index = 0; index < flst.Count; index++)
{
List <XVertex> _Vertexes = new List <XVertex>(); //记录feature的节点
string featuretype = (string)(flst[index]["geometry"]["type"]); //读取对象类型 包括Point LineString Polygon
Newtonsoft.Json.Linq.JToken properties = flst[index]["properties"]; //读取对象的所有字段与属性
//if (featuretype == "Polygon") flst[index]["geometry"]["coordinates"][0]
if (featuretype == "Point")//如果是点对象 则按点对象的数据结构进行处理
{
var location = flst[index]["geometry"]["coordinates"];
double lon = (double)location.First;
double lat = (double)location.Last;
Console.WriteLine(lon);
if (lon > maxx)
{
maxx = lon;
}
else if (lon < minx)
{
minx = lon;
}
if (lat > maxy)
{
maxy = lat;
}
else if (lat < miny)
{
miny = lat;
}
_Vertexes.Add(new XVertex(lon, lat));
ReadJSONField(properties, pointlayer);//右边返回一个Fields泛型赋给左边图层字段
}
else if (featuretype == "LineString")//如果是线对象 则按线对象的数据结构进行处理
{
foreach (var location in flst[index]["geometry"]["coordinates"])
{
double lon = (double)location.First;
double lat = (double)location.Last;
//Console.WriteLine(lon);
if (lon > maxx)
{
maxx = lon;
}
else if (lon < minx)
{
minx = lon;
}
if (lat > maxy)
{
maxy = lat;
}
else if (lat < miny)
{
miny = lat;
}
_Vertexes.Add(new XVertex(lon, lat));
ReadJSONField(properties, linelayer);//右边返回一个Fields泛型赋给左边图层字段
}
}
else if (featuretype == "Polygon")//如果是多边形对象 则按多边形对象的数据结构进行处理
{
foreach (var singlepoly in flst[index]["geometry"]["coordinates"])
{
foreach (var location in singlepoly)
{
double lon = (double)location.First;
double lat = (double)location.Last;
Console.WriteLine(lon);
if (lon > maxx)
{
maxx = lon;
}
else if (lon < minx)
{
minx = lon;
}
if (lat > maxy)
{
maxy = lat;
}
else if (lat < miny)
{
miny = lat;
}
_Vertexes.Add(new XVertex(lon, lat));
ReadJSONField(properties, polygonlayer);//右边返回一个Fields泛型赋给左边图层字段
}
}
}
if (featuretype == "Point")
{
XFeature onefeature = new XFeature(new XPointSpatial(_Vertexes[0]), null); //暂时默认无属性
pointlayer.AddFeature(onefeature); //给线图层添加对象
}
else if (featuretype == "LineString")
{
XFeature onefeature = new XFeature(new XLineSpatial(_Vertexes), null); //暂时默认无属性
linelayer.AddFeature(onefeature); //给线图层添加对象
}
else if (featuretype == "Polygon")
{
XFeature onefeature = new XFeature(new XPolygonSpatial(_Vertexes), null); //暂时默认无属性
polygonlayer.AddFeature(onefeature); //给线图层添加对象
}
}
//Console.WriteLine(minx.ToString(), miny.ToString(), maxx.ToString(), maxy.ToString());
XExtent layersextent = new XExtent(new XVertex(minx, miny), new XVertex(maxx, maxy));
layers.Add(polygonlayer);
layers.Add(linelayer);
layers.Add(pointlayer);
foreach (XLayer ll in layers)
{
ll.Extent = layersextent;//给三种layer赋上共同的extent
ll.DrawAttributeOrNot = false;
}
sr.Close();
return(layers);
}
