/// <summary>
/// 求包围盒
/// </summary>
private void GetBorder()
{
mHeader.Zmin = 0;
mHeader.Zmax = 0;
mHeader.Mmin = 0;
mHeader.Mmax = 0;
double Xmin = 0;
double Ymin = 0;
double Xmax = 0;
double Ymax = 0;
switch (mHeader.GeoType)
{
case ShapeType.Point:
EVPoint pP = mRecordDic[1].GeoShape as EVPoint;
Xmin = pP.X;
Ymin = pP.Y;
Xmax = pP.X;
Ymax = pP.Y;
for (ulong i = 0; i < (ulong)mRecordDic.Count; i++)
{
EVPoint pont = mRecordDic[i + 1].GeoShape as EVPoint;
if (Xmin > pont.X)
{
Xmin = pont.X;
}
if (Xmax < pont.X)
{
Xmax = pont.X;
}
if (Ymin > pont.Y)
{
Ymin = pont.Y;
}
if (Ymax < pont.Y)
{
Ymax = pont.Y;
}
}
mHeader.Xmin = Xmin;
mHeader.Ymin = Ymin;
mHeader.Xmax = Xmax;
mHeader.Ymax = Ymax;
break;
case ShapeType.PolyLine:
EVPolyLine pL = mRecordDic[1].GeoShape as EVPolyLine;
Xmin = pL.Xmin;
Ymin = pL.Ymin;
Xmax = pL.Xmax;
Ymax = pL.Ymax;
for (ulong i = 0; i < (ulong)mRecordDic.Count; i++)
{
EVPolyLine line = mRecordDic[i + 1].GeoShape as EVPolyLine;
if (Xmin > line.Xmin)
{
Xmin = line.Xmin;
}
if (Xmax < line.Xmax)
{
Xmax = line.Xmax;
}
if (Ymin > line.Ymin)
{
Ymin = line.Ymin;
}
if (Ymax < line.Ymax)
{
Ymax = line.Ymax;
}
}
mHeader.Xmin = Xmin;
mHeader.Ymin = Ymin;
mHeader.Xmax = Xmax;
mHeader.Ymax = Ymax;
break;
case ShapeType.Polygon:
EVPolygon pG = mRecordDic[1].GeoShape as EVPolygon;
Xmin = pG.Xmin;
Ymin = pG.Ymin;
Xmax = pG.Xmax;
Ymax = pG.Ymax;
for (ulong i = 0; i < (ulong)mRecordDic.Count; i++)
{
EVPolygon gon = mRecordDic[i + 1].GeoShape as EVPolygon;
if (Xmin > gon.Xmin)
{
Xmin = gon.Xmin;
}
if (Xmax < gon.Xmax)
{
Xmax = gon.Xmax;
}
if (Ymin > gon.Ymin)
{
Ymin = gon.Ymin;
}
if (Ymax < gon.Ymax)
{
Ymax = gon.Ymax;
}
}
mHeader.Xmin = Xmin;
mHeader.Ymin = Ymin;
mHeader.Xmax = Xmax;
mHeader.Ymax = Ymax;
break;
}
}
/// <summary>
/// 读取record数据
/// 当读取时文件流位置在第一个记录处
/// </summary>
/// <param name="reader"></param>
public void Read(BinaryReader reader)
{
//如果header为空先读取header
if (mHeader == null)
{
mHeader.Read(reader);
}
if (mRecordDic != null)
{
mRecordDic.Clear();
}
else
{
mRecordDic = new Dictionary <ulong, ShpData>();
}
//目前只考虑点线面三种类型
switch (mHeader.GeoType)
{
case ShapeType.Point:
while (reader.PeekChar() != -1)
{
EVPoint point = new EVPoint();
uint RecordNum = reader.ReadUInt32();
int DataLength = reader.ReadInt32();
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum); //读取第i个记录
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
int uDataLength = (int)ByteTransUtil.big2little(DataLength); //以字为单位，一字等于2字节，等于16位 长度不包括uRecordNum和uDataLength
int geoType = reader.ReadInt32(); //每一个对象的类型 没有用！
point.RecordNum = uRecordNum;
point.DataLength = uDataLength; //固定10字 没有考虑RecordNum、DataLength 比实际长度少4字
point.GeoType = ShapeType.Point;
point.X = reader.ReadDouble();
point.Y = reader.ReadDouble(); //
ShpData item = new ShpData();
item.GeoShape = point;
mRecordDic.Add(uRecordNum, item);
}
break;
case ShapeType.PolyLine:
while (reader.PeekChar() != -1)
{
EVPolyLine polyline = new EVPolyLine();
polyline.Parts = new ArrayList();
polyline.Points = new ArrayList();
uint RecordNum = reader.ReadUInt32(); //读取第i个记录 从1开始算
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum);
int DataLength = reader.ReadInt32(); //以字为单位，一字等于2字节，等于16位
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
int uDataLength = (int)ByteTransUtil.big2little(DataLength);
int geoType = reader.ReadInt32();//每一个对象的类型 没有用
polyline.RecordNum = uRecordNum;
polyline.DataLength = uDataLength; //没有考虑RecordNum、DataLength 比实际长度少4字
polyline.GeoType = ShapeType.PolyLine;
polyline.Xmin = reader.ReadDouble();
polyline.Ymin = reader.ReadDouble();
polyline.Xmax = reader.ReadDouble();
polyline.Ymax = reader.ReadDouble();
polyline.NumParts = reader.ReadInt32();
polyline.NumPoints = reader.ReadInt32();
for (int i = 0; i < polyline.NumParts; i++)
{
int parts = new int();
parts = reader.ReadInt32();
polyline.Parts.Add(parts);
}
for (int j = 0; j < polyline.NumPoints; j++)
{
EVPoint pointtemp = new EVPoint();
pointtemp.X = reader.ReadDouble();
pointtemp.Y = reader.ReadDouble();
polyline.Points.Add(pointtemp);
}
ShpData item = new ShpData();
item.GeoShape = polyline;
mRecordDic.Add(uRecordNum, item);
}
break;
case ShapeType.Polygon:
while (reader.PeekChar() != -1)
{
EVPolygon polygon = new EVPolygon();
polygon.Parts = new ArrayList();
polygon.Points = new ArrayList();
uint RecordNum = reader.ReadUInt32();
int DataLength = reader.ReadInt32();
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum); //读取第i个记录
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
//以字为单位，一字等于2字节，等于16位
int uDataLength = (int)ByteTransUtil.big2little(DataLength);
int geoType = reader.ReadInt32();
polygon.RecordNum = uRecordNum;
polygon.DataLength = uDataLength;
polygon.GeoType = ShapeType.Polygon;
polygon.Xmin = reader.ReadDouble();
polygon.Ymin = reader.ReadDouble();
polygon.Xmax = reader.ReadDouble();
polygon.Ymax = reader.ReadDouble();
polygon.NumParts = reader.ReadInt32();
polygon.NumPoints = reader.ReadInt32();
for (int j = 0; j < polygon.NumParts; j++)
{
int parts = new int();
parts = reader.ReadInt32();
polygon.Parts.Add(parts);
}
for (int j = 0; j < polygon.NumPoints; j++)
{
EVPoint pointtemp = new EVPoint();
pointtemp.X = reader.ReadDouble();
pointtemp.Y = reader.ReadDouble();
polygon.Points.Add(pointtemp);
}
ShpData item = new ShpData();
item.GeoShape = polygon;
mRecordDic.Add(uRecordNum, item);
}
break;
}
}
/// <summary>
/// 写入record记录
/// 先判断是否获取wkt信息以及写入header
/// 写入的同时 计算shx的记录内容
/// </summary>
/// <param name="writer"></param>
/// <returns>返回shx的文件内容</returns>
public Dictionary <ulong, ShxData> Write(BinaryWriter writer)
{
Dictionary <ulong, ShxData> shxDic = new Dictionary <ulong, ShxData>();
if (isGetWKTInfo)
{
if (writer.BaseStream.Position == 0)
{
mHeader.Write(writer);
}
int offset = 50;//跳过头文件
switch (mHeader.GeoType)
{
case ShapeType.Point:
for (int i = 0; i < mRecordDic.Count; i++)
{
EVPoint point = mRecordDic[(ulong)(i + 1)].GeoShape as EVPoint;
ShxData shx = new ShxData();
shx.ContentLength = point.DataLength;
shx.Offset = offset;
offset += shx.ContentLength + 4;
shxDic.Add(point.RecordNum, shx);
//写入shp
byte[] lbtRecorderNum = BitConverter.GetBytes(point.RecordNum);
byte[] bbtRecorderNum = ByteTransUtil.little2big(lbtRecorderNum);
writer.Write(bbtRecorderNum);
byte[] lbtDataLength = BitConverter.GetBytes(point.DataLength);
byte[] bbtDataLength = ByteTransUtil.little2big(lbtDataLength);
writer.Write(bbtDataLength);
writer.Write((int)ShapeType.Point);
writer.Write(point.X);
writer.Write(point.Y);
}
break;
case ShapeType.PolyLine:
for (int i = 0; i < mRecordDic.Count; i++)
{
EVPolyLine line = mRecordDic[(ulong)(i + 1)].GeoShape as EVPolyLine;
ShxData shx = new ShxData();
shx.ContentLength = line.DataLength;
shx.Offset = offset;
offset += shx.ContentLength + 4;
shxDic.Add(line.RecordNum, shx);
//写入shp
byte[] lbtRecorderNum = BitConverter.GetBytes(line.RecordNum);
byte[] bbtRecorderNum = ByteTransUtil.little2big(lbtRecorderNum);
writer.Write(bbtRecorderNum);
byte[] lbtDataLength = BitConverter.GetBytes(line.DataLength);
byte[] bbtDataLength = ByteTransUtil.little2big(lbtDataLength);
writer.Write(bbtDataLength);
writer.Write((int)line.GeoType);
writer.Write(line.Xmin);
writer.Write(line.Ymin);
writer.Write(line.Xmax);
writer.Write(line.Ymax);
writer.Write(line.NumParts);
writer.Write(line.NumPoints);
for (int j = 0; j < line.NumParts; j++)
{
writer.Write((int)line.Parts[j]);
}
for (int j = 0; j < line.NumPoints; j++)
{
EVPoint point = line.Points[j] as EVPoint;
writer.Write(point.X);
writer.Write(point.Y);
}
}
break;
case ShapeType.Polygon:
for (int i = 0; i < mRecordDic.Count; i++)
{
EVPolygon gon = mRecordDic[(ulong)(i + 1)].GeoShape as EVPolygon;
ShxData shx = new ShxData();
shx.ContentLength = gon.DataLength;
shx.Offset = offset;
offset += shx.ContentLength + 4;
shxDic.Add(gon.RecordNum, shx);
//写入shp
byte[] lbtRecorderNum = BitConverter.GetBytes(gon.RecordNum);
byte[] bbtRecorderNum = ByteTransUtil.little2big(lbtRecorderNum);
writer.Write(bbtRecorderNum);
byte[] lbtDataLength = BitConverter.GetBytes(gon.DataLength);
byte[] bbtDataLength = ByteTransUtil.little2big(lbtDataLength);
writer.Write(bbtDataLength);
writer.Write((int)gon.GeoType);
writer.Write(gon.Xmin);
writer.Write(gon.Ymin);
writer.Write(gon.Xmax);
writer.Write(gon.Ymax);
writer.Write(gon.NumParts);
writer.Write(gon.NumPoints);
for (int j = 0; j < gon.NumParts; j++)
{
writer.Write((int)gon.Parts[j]);
}
for (int j = 0; j < gon.NumPoints; j++)
{
EVPoint point = gon.Points[j] as EVPoint;
writer.Write(point.X);
writer.Write(point.Y);
}
}
break;
}
}
return(shxDic);
}
