Hi folks,
We've been getting strange errors in uDig when rendering from PostGIS
(and possibly others). Everything appeared to draw correctly, but some
exceptions occurred including this:
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
at
org.geotools.renderer.lite.LiteShape2.getBounds2D(LiteShape2.java:538)
at sun.java2d.pipe.AlphaPaintPipe.startSequence(Unknown Source)
at sun.java2d.pipe.SpanShapeRenderer$Composite.startSequence(Unknown
Source)
at sun.java2d.pipe.SpanShapeRenderer.renderSpans(Unknown Source)
It turns out that the decimator was reducing geometries down to a point
or zero length line, and the getEnvelope method was returning an
unexpected single coordinate instead of 5 coordinates as one would
expect for an envelope. My understanding is that the geometry isn't
relevant (incredibly small in contrast to our bbox), so it should be
approximated away.
The actual reduction was taking place here:
Line 82 of org.geotools.renderer.lite.Decimator
here are the parameters and some results.
decimator:
spanx= 1735.4640560498228
spany= 4459.834663945716
geometries:
after decimation:
geometry= POLYGON ((371.1821518726456 257.48731842821735,
371.1821518726456 257.48731842821735))
before:
MULTIPOLYGON (((1477615.2218454846 469175.17166099045,
1477745.4825444575 469214.65571489185, 1477919.7807593197
468927.48498062976, 1477969.8528404355 468818.0049648937,
1478011.7284851405 468709.5105803376, 1478194.201895452
468517.98600566294, 1478193.9772841232 468415.2857901836,
1478117.865123242 468354.40667696577, 1478170.321485953
468137.5217748834, 1478238.647530919 468035.36440508347,
1478541.5191640307 468122.6622347776, 1478796.6832695315
468292.55929470155, 1478863.3525996725 468372.3869243795,
1478821.7150299242 468519.16123440117, 1478889.7430130139
468628.35081162397, 1479039.384361268 468642.0820898507,
1479295.699527227 468666.17062211316, 1479346.761199392
468580.9734557634, 1479318.2114595103 468527.0635735942,
1479509.7032213411 468545.03706498165, 1479549.5311105016
468187.6577363359, 1479722.1479424688 468203.2644469859,
1479733.5049643456 467976.1924967328, 1479462.9032765087
467961.3845828846, 1479536.3756330267 467641.44418686815,
1479664.6604609597 467648.4714136515, 1479670.8993770792
467526.45055045746, 1479671.5234575176 467513.4432325987,
1479676.391633086 467410.3757445188, 1479370.8881696789
467408.30431078374, 1479298.1001864877 467465.6115700174,
1479007.5996645929 467569.1003571311, 1478849.4734263632
467719.38540598005, 1478722.0545306858 467729.57989721093,
1478615.363082244 467791.6959488727, 1478283.7982984053
467723.952449508, 1478187.428064557 467727.97485588305,
1478110.7956281113 467767.68914341833, 1478020.8911947464
467736.28558699414, 1477777.157076939 467531.58991804905,
1477663.1602755946 467499.17965187505, 1477656.0903286838
467459.0369626684, 1477942.9937632165 467319.86301490664,
1478038.7741605043 467175.85282696225, 1478062.1517368509
467037.8640569467, 1478151.0848165292 466972.51470341533,
1478229.6015064481 466837.4129617736, 1478217.448519992
466757.3771737153, 1478279.3336572926 466577.91496907733,
1478153.7813977636 466565.193952607, 1478096.7604875606
466649.64239593036, 1477876.2193113856 466565.6259017056,
1477792.3627655702 466703.0775970323, 1477637.8535009557
466792.41608849354, 1477617.8407517788 466879.49131595343,
1477562.081575073 466873.5075962506, 1477222.8653492252
467156.1025165627, 1477145.219711788 467292.32081682514,
1476793.7732193698 467278.46038279403, 1476868.9206000913
466599.39287489, 1476822.3660022337 466520.07850317564,
1476976.542808525 466224.35386517085, 1477125.6410954376
465864.581159913, 1477192.265480352 465566.94283922296,
1477321.5822108972 465388.89022222906, 1477330.6670675226
465292.3945368519, 1476586.1667394228 465194.04116891976,
1476492.640329827 465255.7955662636, 1476359.47481049
465440.41190651245, 1476276.5249846836 465393.7796687819,
1476148.237255321 465394.8114559911, 1476150.395542861
465811.78914804757, 1476182.6845889443 465811.8100952478,
1476007.0474955596 465997.14362005703, 1475965.423080817
466111.7052397765, 1475913.1431864826 466094.08052614797,
1475579.2163293445 466688.36498296354, 1475752.1467656419
467015.02606367413, 1475634.495093144 467260.977840011,
1475259.1804203163 468040.3238858571, 1474642.4782261061
469344.04669830576, 1475358.1256199805 468819.7358662309,
1475605.5566736711 469147.69381416123, 1475857.2000551138
468919.53992542624, 1475976.5362506506 468941.5457006134,
1476022.49198297 468905.0300962981, 1476016.6842837783
468766.40013842937, 1476146.473087369 468689.0581017649,
1476159.038312018 468580.9159108531, 1476332.5563088502
468428.5296296235, 1476384.3639167487 468321.2808267176,
1476566.7643577652 468451.850736971, 1476605.0063515452
468484.82913864776, 1476612.5704917351 468537.1130731506,
1476548.8530837875 468586.5004168749, 1476744.6546054832
468763.0413225377, 1476838.433242736 468675.1461427389,
1477281.679083753 469099.12833716255, 1477344.6614469343
469007.3721617386, 1477507.193906828 469119.3501138631,
1477614.8578680712 469137.88199126534, 1477614.8504602015
469170.09211768396, 1477615.2218454846 469175.17166099045)))
I added a little hack to work around this (null is returned instead of
an exception being thrown).
Please see r19245 on 2.2.x -- is this a reasonable fix, or is there a
better way?
Cheers,
Cory.
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