/// <summary>
/// Method to read the coordinates block
/// </summary>
/// <param name="reader">The reader</param>
/// <param name="numPoints">The total number of points to read</param>
/// <param name="markers">The markers</param>
/// <param name="ordinates">The ordinates to read</param>
/// <param name="buffer">The buffer to add the coordinates to.</param>
private static void ReadCoordinates(BinaryReader reader, int numPoints, int[] markers, Ordinates ordinates, CoordinateBuffer buffer)
{
var offset = buffer.Count;
var j = 0;
// Add x- and y-ordinates
for (var i = 0; i < numPoints; i++)
{
//Read x- and y- ordinates
buffer.AddCoordinate(reader.ReadDouble(), reader.ReadDouble());
//Check if we have reached a marker
if (i != markers[j])
{
continue;
}
//Add a marker
buffer.AddMarker();
j++;
}
// are there any z-ordinates
if ((ordinates & Ordinates.Z) == Ordinates.Z)
{
//Read zInterval
/*var zInterval = */ ReadInterval(reader);
//Set the z-values
for (var i = 0; i < numPoints; i++)
{
buffer.SetZ(offset + i, reader.ReadDouble());
}
}
if ((ordinates & Ordinates.M) == Ordinates.M)
{
//Read m-interval
/*var mInterval = */ ReadInterval(reader);
//Set the m-values
for (var i = 0; i < numPoints; i++)
{
buffer.SetZ(offset + i, reader.ReadDouble());
}
}
}
/*
* protected static double[] ReadDoubles(BigEndianBinaryReader reader, int count)
* {
* var result = new double[count];
* for (var i = 0; i < count; i++)
* result[i] = reader.ReadDouble();
* return result;
* }
*/
/// <summary>
/// Get the z values and populate each one of them in Coordinate.Z
/// If there are M values, return an array with those.
/// </summary>
/// <param name="file">The reader</param>
/// <param name="totalRecordLength">Total number of bytes in this record</param>
/// <param name="currentlyReadBytes">How many bytes are read from this record</param>
/// <param name="buffer">The coordinate buffer</param>
/// <param name="skippedList">A list of indices which have not been added to the buffer</param>
protected void GetZMValues(BigEndianBinaryReader file, int totalRecordLength, ref int currentlyReadBytes, CoordinateBuffer buffer, HashSet <int> skippedList = null)
{
int numPoints = buffer.Capacity;
if (HasZValue())
{
boundingBox[boundingBoxIndex++] = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
boundingBox[boundingBoxIndex++] = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
int numSkipped = 0;
for (int i = 0; i < numPoints; i++)
{
double z = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
if (skippedList?.Contains(i) != true)
{
buffer.SetZ(i - numSkipped, z);
}
else
{
numSkipped++;
}
}
}
// Trond: Note that M value is always optional per the shapefile spec. So we need to test total read record bytes
// v.s. read bytes to see if we have them or not
// Also: If we have Z we might have M. Per shapefile defn.
if ((HasMValue() || HasZValue()) && currentlyReadBytes < totalRecordLength)
{
boundingBox[boundingBoxIndex++] = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
boundingBox[boundingBoxIndex++] = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
int numSkipped = 0;
for (int i = 0; i < numPoints; i++)
{
double m = ReadDouble(file, totalRecordLength, ref currentlyReadBytes);
if (skippedList?.Contains(i) != true)
{
buffer.SetM(i - numSkipped, m);
}
else
{
numSkipped++;
}
}
}
if (currentlyReadBytes < totalRecordLength)
{
int remaining = totalRecordLength - currentlyReadBytes;
file.ReadBytes(remaining * 2);
}
}
/// <summary>
/// Method to read the coordinates block
/// </summary>
/// <param name="reader">The reader</param>
/// <param name="numPoints">The total number of points to read</param>
/// <param name="markers">The markers</param>
/// <param name="ordinates">The ordinates to read</param>
/// <param name="buffer">The buffer to add the coordinates to.</param>
private static void ReadCoordinates(BinaryReader reader, int numPoints, int[] markers, Ordinates ordinates, CoordinateBuffer buffer)
{
var offset = buffer.Count;
var j = 0;
// Add x- and y-ordinates
for (var i = 0; i < numPoints; i++)
{
//Read x- and y- ordinates
buffer.AddCoordinate(reader.ReadDouble(), reader.ReadDouble());
//Check if we have reached a marker
if (i != markers[j]) continue;
//Add a marker
buffer.AddMarker();
j++;
}
// are there any z-ordinates
if ((ordinates & Ordinates.Z) == Ordinates.Z)
{
//Read zInterval
/*var zInterval = */ ReadInterval(reader);
//Set the z-values
for (var i = 0; i < numPoints; i++)
buffer.SetZ(offset + i, reader.ReadDouble());
}
if ((ordinates & Ordinates.M) == Ordinates.M)
{
//Read m-interval
/*var mInterval = */ ReadInterval(reader);
//Set the m-values
for (var i = 0; i < numPoints; i++)
buffer.SetZ(offset + i, reader.ReadDouble());
}
}
