Dear ILWIS-List members,
ILWIS uses the Windows function "Polygon" to draw polygons on the
screen. This function has the following limitation.
>From the MicroSoft documentation (MSDN):
"The Polygon function draws a polygon consisting of two or more vertices
connected by straight lines. The polygon is outlined by using the
current pen and filled by using the current brush and polygon fill mode.
Remarks:
Windows 95/98/Me: Polygon is limited in the number of points it can
draw, depending on the line width, as shown in the following table.
Line width Maximum
number of points
line width is 1
16K
line width > 1 (that is, wideline) and device supports wideline
16K
line width > 1 but the device does not support wideline
approximately 1360 (that is, a few less than 16K / 12"
In order words, when you are using Windows 95/98/Me a polygon that has a
standard line width may contain a maximum of 16000 points.
In ILWIS 3.0, When you are running Windows 2000 or NT, the maximum
number of points will be 64000.
Best regards,
B. (Boudewijn) van Leeuwen M.Sc.
Software Tester
IT Department, Sector Remote Sensing & GIS
International Institute for Aerospace Survey and Earth Sciences (ITC)
P.O. Box 6, 7500 AA Enschede, The Netherlands
Telefax +31 (0)53 4874 335
Internet http://www.itc.nl
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