[mapserver-users] buffer function

Fri Oct 10 08:27:36 EDT 2008

hello all

I want to shrink or increase a shape, and for that I use the buffer
but if I look at the WKT streng I get a lot of points
and its because it make a curve around the corner

is it possible to set how many segment it shall make ?
so if I have a WKT with 4 corners
I would like a new WKT with 4 corners if I make the shape bigger

here is the wkt I have and the WKT it returns

Org WKT
POLYGON((482728.617354642 6285505.17359964, 482710.831068496
6285449.33496543, 482774.225119444 6285437.03746855, 482789.364489571
6285486.76734618, 482728.617354642 6285505.17359964))

New WKT after using Buffer

POLYGON ((482728.9073336222200000 6285506.1306326548000000,
482789.6544685512200000 6285487.7243791949000000,
482789.7041995495100000 6285487.7078764187000000,
482789.7529978694500000 6285487.6887914045000000,
482789.8007295344700000 6285487.6671765493000000,
482789.8472634966600000 6285487.6430911981000000,
482789.8924719964300000 6285487.6166014764000000,
482789.9362309131000000 6285487.5877801124000000,
482789.9784201060500000 6285487.5567062357000000,
482790.0189237442100000 6285487.5234651603000000,
482790.0576306243300000 6285487.4881481500000000,
482790.0944344761700000 6285487.4508521678000000,
482790.1292342541300000 6285487.4116796106000000,
482790.1619344150500000 6285487.3707380267000000,
482790.1924451800900000 6285487.3281398220000000,
482790.2206827816600000 6285487.2840019511000000,
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482728.8573073492200000 6285506.1443842184000000,
482728.9073336222200000 6285506.1306326548000000))

CODE
$ms_shapeFromWKT_main = ms_shapeObjFromWkt( $wktstreng  );
$new_shape = $ms_shapeFromWKT_main->Buffer(1);
echo($new_shape->toWKT() . "<br>");

Jeppe

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