/// <summary>
/// Creates a custom transformation chain out of coordinate reference system description.
/// </summary>
/// <param name="wkt">The projection parameters, specified as Proj4 well known text.</param>
/// <param name="param">The name of the parameter containing the custom transformation description.</param>
/// <param name="remove">If set to true, removes the custom transformation description from the well known text after processing it.</param>
/// <returns>The <see cref="CustomTransformation"/> matching the description.</returns>
public static CustomTransformation Parse(ref string wkt, string param, bool remove)
{
// i: index of parameter in wkt
// j: index of parameter's value in wkt
// k: index of follow up parameter, if any
// l: adjusted begin of follow up parameter.
// Points to string end if there is no follow up parameter.
int i = wkt.IndexOf("+" + param + "=");
if (i < 0)
{
return(null);
}
int j = i == -1 ? -1 : i + 2 + param.Length;
int k = i == -1 ? -1 : wkt.IndexOf('+', j);
int l = k < 0 ? wkt.Length : k;
Stack <string> args =
new Stack <string>(wkt.Substring(j, l - j).Trim().Split(',').Reverse());
CustomTransformation ct =
args.Count < 1 ? null : Parse(args);
if (remove)
{
wkt = wkt.Substring(0, i) + (l < wkt.Length ? wkt.Substring(l) : "");
}
return(ct);
}
/// <summary>
/// Creates a custom transformation chain out of a textual description.
/// </summary>
/// <param name="args">The custom transformation description.</param>
/// <returns>The <see cref="CustomTransformation"/> matching the description.</returns>
private static CustomTransformation Parse(Stack <string> args)
{
CustomTransformation ct = null;
while (args.Count > 0)
{
ConstructorInfo c = Type.GetType(args.Pop()).GetConstructor(BindingFlags.Instance | BindingFlags.Public |
BindingFlags.NonPublic, null, new[] { typeof(Stack <string>) }, null);
var instance = (CustomTransformation)c.Invoke(new object[] { args });
if (ct == null)
{
ct = instance;
}
else
{
ct.InnerMost = instance;
}
}
return(ct);
}
/// <summary>
/// Initializes a new instance of the <see cref="CustomTransformation"/> class.
/// </summary>
/// <param name="innerTransformation">The inner <see cref="CustomTransformation"/> instance, non-null for nested transformations.</param>
public CustomTransformation(CustomTransformation innerTransformation = null)
{
InnerTransformation = innerTransformation;
}
/// <summary>
/// Initializes a new instance of the <see cref="GeoMinSekTransformation"/> class.
/// </summary>
/// <param name="inner">Inner custom transformation (optional).</param>
public GeoMinSekTransformation(CustomTransformation inner = null)
: base(inner)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ShiftScaleTransformation"/> class.
/// </summary>
/// <param name="shift">Shift value for the x- and y-coordinate.</param>
/// <param name="scale">Scale factor for the x- and y-coordinate.</param>
/// <param name="inner">Inner custom transformation (optional).</param>
public ShiftScaleTransformation(double shift, double scale, CustomTransformation inner = null)
: base(inner)
{
shx = shy = shift;
scx = scy = scale;
}
/// <summary>
/// Initializes a new instance of the <see cref="ShiftScaleTransformation"/> class.
/// </summary>
/// <param name="shx">Shift value for the x-coordinate.</param>
/// <param name="shy">Shift value for the y-coordinate.</param>
/// <param name="scx">Scale factor for the x-coordinate.</param>
/// <param name="scy">Scale factor for the y-coordinate.</param>
/// <param name="inner">Inner custom transformation (optional).</param>
public ShiftScaleTransformation(double shx, double shy, double scx, double scy, CustomTransformation inner = null)
: base(inner)
{
this.shx = shx;
this.shy = shy;
this.scx = scx;
this.scy = scy;
}
/// <summary>
/// Initializes a new instance of the <see cref="ShiftScaleTransformation"/> class.
/// </summary>
/// <param name="inner">Inner custom transformation (optional).</param>
public ShiftScaleTransformation(CustomTransformation inner)
: base(inner)
{
}
