public XLayer ReadShapefile(string shpfilename)
{
//打开文件和读取工具
FileStream fsr = new FileStream(shpfilename, FileMode.Open);
BinaryReader br = new BinaryReader(fsr);
//读取文件头
ShapefileHeader sfh = (ShapefileHeader)
XTools.FromBytes(br, typeof(ShapefileHeader));
//获得空间对象类型
SHAPETYPE ShapeType = (SHAPETYPE)Enum.Parse(typeof(SHAPETYPE), sfh.ShapeType.ToString());
//获得空间范围
XExtent extent = new XExtent(new XVertex(sfh.Xmin, sfh.Ymin),
new XVertex(sfh.Xmax, sfh.Ymax));
//读dbf
string dbfFileName = shpfilename.Replace(".shp", ".dbf");
List <XField> fields = new List <XField>();
List <XAttribute> attributes = new List <XAttribute>();
ReadDBFFile(dbfFileName, fields, attributes);
//构建图层
XLayer layer = new XLayer(shpfilename, ShapeType, extent, fields);
int index = 0;
while (br.PeekChar() != -1)
{
//读记录头
RecordHeader rh = (RecordHeader)
XTools.FromBytes(br, typeof(RecordHeader));
int RecordLength = FromBigToLittle(rh.RecordLength) * 2 - 4;
byte[] RecordContent = br.ReadBytes(RecordLength);
//开始读实际的空间数据
if (ShapeType == SHAPETYPE.point)
{
XPointSpatial point = ReadPoint(RecordContent);
layer.AddFeature(new XFeature(point, attributes[index]));
}
else if (ShapeType == SHAPETYPE.line)
{
List <XLineSpatial> lines = ReadLines(RecordContent);
foreach (XLineSpatial line in lines)
{
layer.AddFeature(new XFeature(line, new XAttribute(attributes[index])));
}
}
else if (ShapeType == SHAPETYPE.polygon)
{
List <XPolygonSpatial> polygons = ReadPolygons(RecordContent);
foreach (XPolygonSpatial polygon in polygons)
{
layer.AddFeature(new XFeature(polygon, new XAttribute(attributes[index])));
}
}
index++;
}
//关闭读取工具和文件
br.Close();
fsr.Close();
return(layer);
}
internal void SelectByClick(Point location, XView view)
{
XVertex v = view.ToMapVertex(location);
foreach (XFeature feature in Features)
{
feature.Selected = false;
}
if (ShapeType == SHAPETYPE.point)
{
Double distance = Double.MaxValue;
int id = -1;
for (int i = 0; i < Features.Count; i++)
{
XPointSpatial point = (XPointSpatial)(Features[i].Spatial);
double dist = point.Distance(v);
if (dist < distance)
{
distance = dist;
id = i;
}
}
double scd = view.ToScreenDistance(v, Features[id].Spatial.Centroid);//转为屏幕距离
if (scd <= 5)
{
Features[id].Selected = true;
}
else
{
Console.WriteLine("屏幕距离为" + scd + ",选择无效!!");
}
}
else if (ShapeType == SHAPETYPE.line)
{
Double distance = Double.MaxValue;
int id = -1;
for (int i = 0; i < Features.Count; i++)
{
XLineSpatial line = (XLineSpatial)(Features[i].Spatial);
double dist = line.Distance(v);
if (dist < distance)
{
distance = dist;
id = i;
}
}
double scd = view.ToScreenDistance(distance);//转为屏幕距离
if (scd <= 5)
{
Features[id].Selected = true;
}
else
{
Console.WriteLine("屏幕距离为" + scd + ",选择无效!!");
}
}
else if (ShapeType == SHAPETYPE.polygon)
{
for (int i = 0; i < Features.Count; i++)
{
XPolygonSpatial polygon = (XPolygonSpatial)(Features[i].Spatial);
if (polygon.Incude(v))
{
Features[i].Selected = true;
}
}
}
}
