Opened 10 years ago

Closed 9 years ago

Last modified 9 years ago

#2118 closed patch (fixed)

Implement ST_Boundary(Triangle)

Reported by: strk Owned by: nw
Priority: medium Milestone: PostGIS 2.1.0
Component: postgis Version: master
Keywords: history Cc:


Seems to be a useful thing to have…

Attachments (1)

triboundary.patch (2.0 KB ) - added by nw 9 years ago.

Download all attachments as: .zip

Change History (11)

comment:1 by robe, 9 years ago

Milestone: PostGIS 2.1.0PostGIS Future

by nw, 9 years ago

Attachment: triboundary.patch added

comment:2 by nw, 9 years ago

Owner: changed from pramsey to nw
Status: newassigned

The attached patch will implement this. A polygon would be pretty simple to do without going to GEOS also, though not trivial like the triangle.

comment:3 by robe, 9 years ago

Milestone: PostGIS FuturePostGIS 2.1.0

seems harmless enough.

comment:4 by robe, 9 years ago

Resolution: fixed
Status: assignedclosed

committed at r11358 . If you can get in a patch for TIN before end next week, I might be able to commit (and call this fully supporting tins in docs). Right now (I'd have to put in just a note that it supports triangle, which ain't bad since I think ST_Dump supports and they can do their own boundary by combining the 2).

comment:5 by robe, 9 years ago

Type: enhancementpatch

comment:6 by robe, 9 years ago

amended docs at r11359

comment:7 by robe, 9 years ago

Keywords: history added

comment:8 by strk, 9 years ago

I'm seeing too many changes in lwgeom-geos connectors these days. May be worth some talk on the mailing list before it messes up too much ? Do I understand correctly that TRIANGLES are being threated like MULTILINESTRINGS when converted to GEOS ? Would it make more sense to convert to polygon ? Should we expose a Triangle geometry in GEOS C-API ?

comment:9 by nw, 9 years ago

I don't think that triangles are converted to geos at all. A look through the LWGEOM2GEOS() function doesn't seem to have any entry for a TRIANGLETYPE in the switch, so I think you'd get a call to lwerror() if you somehow managed to pass in a triangle. Curved geometries will fail also. Perhaps something else is converting them before a call to LWGEOM2GEOS().

I don't think GEOS has a triangle type, so you'd have to convert to a polygon if you were to do this.

comment:10 by strk, 9 years ago

ok then, I misread the patch, sorry for the noise.

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