=== purpose of the program ===

XY-Function enables 2D and 3D presentations of data given 
on unstructured grids of XY-points. 
The mathematical approach is based on the DELAUNAY triangulation. 
For this test version the number of points is restricted to 2000. 
The values and XY-coordinates can be read or saved with text files or they can manually be added one by one. 
2D-Images with arbitrary numbers of contour lines and arbitrary colors can be generated. 
3D-images (by using OpenGL) of functions can be drawn and rotated to get a better spatial impression of the data. 
Interpolated values of the function belonging to arbitrary coordinates are displayed simultaneously with the mouse movement. 
Interpolations of a complete function belonging to other, arbitrary grids of points are supported. 
XY-Function requires OpenGL 1.1 (contained in Win 98/ME/NT) to present 3D-images. 


=== installation ===

normal software setup


=== status  ===

The program XY-FUNCTION is Freeware! It is distributed in the hope that it will 
be useful for many users, but without any guarantee, not once the guarantee 
of a normal working. 
The author doesn't assume any liability for possible fault and 
damages to soft and hardware caused by the program!
Kurt Helming, Dresden, Germany has the copyright at the program.
The distribution, the sale or other commercial use of the program is permitted 
only with consent of the author (helming@texture.de). 
A link on the internet sides www.texture.de, www.anisotropy.de or www.anisotropy.com is 
permitted and particularly desired.
The name of the program is Kurt Helming's XY-Function.
