Re: [Jts-topo-suite-user] Buffer operation with linestring, variable distance per segment
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Re: [Jts-topo-suite-user] Buffer operation with linestring, variable distance per segment
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From: Martin D. <mtn...@te...> - 2013-08-08 14:21:02
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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 <mailto:sun...@gm...> > *Sent:* Thursday, August 8, 2013 2:51 PM > *To:* Anben PANGLOSE <mailto:ben...@ho...> > *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 <ben...@ho... > <mailto:ben...@ho...>> 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. > > ------------------------------------------------------------------------------ > Get 100% visibility into Java/.NET code with AppDynamics Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > _______________________________________________ > Jts-topo-suite-user mailing list > Jts...@li... > <mailto:Jts...@li...> > https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user > > > > ------------------------------------------------------------------------------ > Get 100% visibility into Java/.NET code with AppDynamics Lite! > It's a free troubleshooting tool designed for production. > Get down to code-level detail for bottlenecks, with <2% overhead. > Download for free and get started troubleshooting in minutes. > http://pubads.g.doubleclick.net/gampad/clk?id=48897031&iu=/4140/ostg.clktrk > > > _______________________________________________ > Jts-topo-suite-user mailing list > Jts...@li... > https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2013.0.3392 / Virus Database: 3209/6557 - Release Date: 08/06/13 > |