Opened 12 years ago
Closed 9 years ago
#2232 closed defect (fixed)
Accumulated error with relative coordinates in ST_AsSvg
Reported by: | nicklas | Owned by: | pramsey |
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Priority: | medium | Milestone: | PostGIS 2.0.8 |
Component: | postgis | Version: | 2.0.x |
Keywords: | Cc: |
Description (last modified by )
When using ST_ASSvg outputting relative rounded coordinates you might get accumulated rounding errors.
I saw huge errors like that when testing twkb on polygons with thousands of vertex-points.
Example:
select st_assvg('LINESTRING(0 0, 0.4 0, 0.8 0, 1.2 0,1.6 0, 2 0)'::geometry,1,0)
returns:
M 0 0 l 0 0 0 0 0 0 0 0 0 0
I fixed it in twkb-case in the spike with r11165, probably the same approach can be used here.
Just not get the relative value as relative to the previous coordinate, but relative to the accumulates relative coordinates achieved.
Change History (9)
comment:1 by , 12 years ago
Owner: | changed from | to
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Status: | new → assigned |
comment:2 by , 12 years ago
Description: | modified (diff) |
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comment:3 by , 11 years ago
Milestone: | → PostGIS 2.0.5 |
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comment:4 by , 11 years ago
Milestone: | PostGIS 2.0.5 → PostGIS 2.0.6 |
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comment:5 by , 9 years ago
Milestone: | PostGIS 2.0.7 → PostGIS 2.0.8 |
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comment:6 by , 9 years ago
Resolution: | → fixed |
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Status: | assigned → closed |
comment:7 by , 9 years ago
Resolution: | fixed |
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Status: | closed → reopened |
as dbaston noted in #3383, can't use getPoint2d_cp in 2.0. So reopening this.
Good catch dbaston
comment:8 by , 9 years ago
Owner: | changed from | to
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Status: | reopened → new |
comment:9 by , 9 years ago
Resolution: | → fixed |
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Status: | new → closed |
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Fixed in 2.0 r14454, 2.1 r14455, 2.2 r14456, trunk r14457