Ok I see, i am trying to modify the code to achieve my goal, i will post my
solution if I got something working... I need to study the source code deeper...
Anyway thank you for your help.
Anben.
From: Landon Blake
Sent: Thursday, August 8, 2013 4:55 PM
To: [email protected]
Subject: Re: [Jts-topo-suite-user] Buffer operation with linestring, variable
distance per segment
Anben:
Let me know if you decide to attempt this. I might be able to offer some
suggestions and help.
Landon
On Thu, Aug 8, 2013 at 7:20 AM, Martin Davis <[email protected]> wrote:
As I said in that note, this is theoretically possible, with some careful and
somewhat geometrically complex coding. Unfortunately this hasn't been done yet.
In order to make this change you're going to need to fully understand how the
OffsetCurveBuilder code works. At that point you should be able to determine
how to modify it yourself.
On 8/8/2013 6:17 AM, Anben PANGLOSE wrote:
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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