CoreandServices.book - Ocean - Schlumberger

Coordinate Systems
// Initialize the transformation matrix
if (!(localT.Matrix.MakeRST(lowerLeftXY, lowerLeftIJ,
upperLeftXY, upperLeftIJ,
upperRightXY, upperRightIJ)))
{
Console.WriteLine(“Error setting up local transform matrix.”);
}
// Get the matrix we created to use later.
Matrix4 outMatrix = localT.Matrix;
// Set up forward (X,Y to I,J) and inverse (I,J to X,Y) converters.
ICoordSysConverter xy2ij = localT.ForwardConverter();
ICoordSysConverter ij2xy = localT.InverseConverter();
// Create and convert an X,Y point to I,J and back
Point2 xy = new Point2(150000.0, 150000.0);
Point2 ij = xy2ij.Convert(xy, out status);
// Now convert back
Point2 xyBack = ij2xy.Convert(ij, out status);
This example shows a conversion using the matrix that we have created to transform a
point. Here we initialize the LocalTransform with the matrix and then use the
Convert method to perform the conversion.
// Create the local transform object
LocalTransform localT = new LocalTransform();
...
// Add the previous examples matrix to the transform object
localT.Matrix = ourMatrix;
// Now create a point and convert it.
Point3 xyz = new Point3(120000.0, 75000.0, 1500.0);
Point3 xyzConverted = localT.Convert(xyz, out status);
Translation
LocalTransform may also be used to translate points. Translation is the shifting of a
point’s location by some distance defined by values in X, Y, and Z. The point does not
Schlumberger Private
Ocean Services 4-223