I found a old thread talking about that I think:
http://sourceforge.net/mailarchive/message.php?msg_id=25822538
([Jts-topo-suite-user] Buffer for LineString with different buffer values for
each side of)
Dr JTS said it was feasible using spiral? Is it the same problem?
I am using the buffer operation to convert simple lines into walls. Each
segment of the linestring is a wall, and each wall can have its own thickness.
My problem are the joints and the end caps that JTS handle very brillantly. I
thaught it would be possible to change the algorithm used in JTS to consider a
different distance parameter for each segment in the linestring.
Where in the code do I have to change the _distance variable to achieve my goal?
@Landon Blake: I cannot split my input linestring into smaller chunks and then
buffer eash segment, because I need the joint between each segment. After the
merging of all the resulting polygon I will not have nice joints.
Anben.
From: Landon Blake
Sent: Thursday, August 8, 2013 2:51 PM
To: Anben PANGLOSE
Subject: Re: [Jts-topo-suite-user] Buffer operation with linestring, variable
distance per segment
Anben:
I'm pretty sure JTS doesn't do this out of the box. One work around would be to
split your input linestring into smaller chunks based on the buffer widths.
Then buffer them independently and merge the resulting polygons.
Landon
On Thu, Aug 8, 2013 at 3:25 AM, Anben PANGLOSE <[email protected]> wrote:
Hello, first of all thank you for this wonderful tool! i am using the c# port
of JTS. I am new to JTS and i am trying to use the BufferBuilder class to
compute polygon from linestring. It works like a charm, my problem is: Is there
any way to compute the buffer from linestring but instead of using a constant
distance, I would like to associate a distance per segment in the linestring
(so that the distance parameter in the buffer operation is not a global
parameter but associated with a segment).
To illustrate:
input:
LINESTRING (90 480, 90 290, 320 290)
(it’s a simple L)
output with the buffer operation with a distance = 20:
POLYGON ((110 310, 320 310, 340 310, 340 270, 70 270, 70 480, 70 500, 110
500, 110 310))
I would like for example to specify to BufferBuilder that the vertical part
of the L have a distance = 20, and that the horizontal part of the L has a
distance = 10 to have this output:
POLYGON ((110 300, 320 300, 340 300, 340 280, 70 280, 70 480, 70 500, 110
500, 110 300))
Do you think this is possible? I am trying to modify the OffsetCurveBuilder
class but without any success, can someone help me? Where to start?
Thanks in advance and excuse my poor english, i speak french...
Anben.
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