Artifact when using trails + stroke

[DiegoNolan]

The combination of trails and strokeTrail produces artifacts in the rasterific backend but not the SVG backend. There are lines going across the fill for the PNG but the SVG is completely solid. I've attached a minimal example below.

{-# LANGUAGE FlexibleContexts          #-}
{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE TypeFamilies              #-}
module Artifact where

import           Data.Aeson
import           Data.Vector                 (Vector)
import qualified Data.Vector                 as V
import           Diagrams.Backend.Rasterific
import           Diagrams.Backend.SVG
import           Diagrams.Prelude

test :: IO ()
test = do
  renderSVG "wyoming.svg" (dims (V2 1000 1000)) mkDia
  renderRasterific "wyoming.png" (dims (V2 1000 1000)) mkDia

mkDia = (map p2 pts)
        # fromVertices
        # closeTrail
        # strokeTrail
        # fc blue
        # bgFrame 1 white

pts :: [(Double, Double)]
pts = [(-109.050076,41.000659),(-109.173682,41.000859),(-109.231985,41.002059),(-109.250735,41.001009),(-109.500694,40.999127),(-109.534926,40.998143),(-109.676421,40.998395),(-109.713877,40.998266),(-109.715409,40.998191),(-109.854302,40.997661),(-109.855299,40.997614),(-109.97553,40.997912),(-109.999838,40.99733),(-110.000708,40.997352),(-110.006495,40.997815),(-110.121639,40.997101),(-110.125709,40.99655),(-110.237848,40.995427),(-110.250709,40.996089),(-110.375714,40.994947),(-110.500718,40.994746),(-110.539819,40.996346),(-110.715026,40.996347),(-110.750727,40.996847),(-111.046723,40.997959),(-111.046551,41.251716),(-111.0466,41.360692),(-111.046264,41.377731),(-111.045789,41.565571),(-111.046689,42.001567),(-111.047109,42.142497),(-111.047107,42.148971),(-111.047058,42.182672),(-111.047097,42.194773),(-111.047074,42.280787),(-111.04708,42.34942),(-111.046801,42.504946),(-111.046017,42.582723),(-111.043564,42.722624),(-111.044135,42.874924),(-111.043959,42.96445),(-111.043957,42.969482),(-111.043924,42.975063),(-111.044129,43.018702),(-111.044206,43.022614),(-111.044034,43.024581),(-111.044034,43.024844),(-111.044033,43.026411),(-111.044094,43.02927),(-111.043997,43.041415),(-111.044058,43.04464),(-111.044063,43.046302),(-111.044086,43.054819),(-111.044117,43.060309),(-111.04415,43.066172),(-111.044162,43.068222),(-111.044143,43.072364),(-111.044235,43.177121),(-111.044266,43.177236),(-111.044232,43.18444),(-111.044168,43.189244),(-111.044229,43.195579),(-111.044617,43.31572),(-111.045706,43.659112),(-111.04588,43.681033),(-111.046118,43.684902),(-111.046051,43.685812),(-111.04611,43.687848),(-111.046421,43.722059),(-111.046435,43.726545),(-111.04634,43.726957),(-111.046715,43.815832),(-111.046515,43.908376),(-111.046917,43.974978),(-111.047349,43.999921),(-111.049077,44.020072),(-111.048751,44.060403),(-111.048751,44.060838),(-111.048633,44.062903),(-111.048452,44.114831),(-111.049119,44.124923),(-111.049695,44.353626),(-111.049148,44.374925),(-111.049216,44.435811),(-111.049194,44.438058),(-111.048974,44.474072),(-111.055208,44.624927),(-111.055511,44.725343),(-111.056416,44.749928),(-111.056888,44.866658),(-111.055629,44.933578),(-111.056207,44.935901),(-111.055199,45.001321),(-111.044275,45.001345),(-110.785008,45.002952),(-110.761554,44.999934),(-110.750767,44.997948),(-110.705272,44.992324),(-110.552433,44.992237),(-110.547165,44.992459),(-110.48807,44.992361),(-110.402927,44.99381),(-110.362698,45.000593),(-110.342131,44.999053),(-110.324441,44.999156),(-110.28677,44.99685),(-110.199503,44.996188),(-110.110103,45.003905),(-110.026347,45.003665),(-110.025544,45.003602),(-109.99505,45.003174),(-109.875735,45.003275),(-109.798687,45.002188),(-109.75073,45.001605),(-109.663673,45.002536),(-109.574321,45.002631),(-109.386432,45.004887),(-109.375713,45.00461),(-109.269294,45.005283),(-109.263431,45.005345),(-109.103445,45.005904),(-109.08301,44.99961),(-109.062262,44.999623),(-108.578484,45.000484),(-108.565921,45.000578),(-108.500679,44.999691),(-108.271201,45.000251),(-108.249345,44.999458),(-108.238139,45.000206),(-108.218479,45.000541),(-108.14939,45.001062),(-108.000663,45.001223),(-107.997353,45.001565),(-107.750654,45.000778),(-107.608854,45.00086),(-107.607824,45.000929),(-107.49205,45.00148),(-107.351441,45.001407),(-107.13418,45.000109),(-107.125633,44.999388),(-107.105685,44.998734),(-107.084939,44.996599),(-107.074996,44.997004),(-107.050801,44.996424),(-106.892875,44.995947),(-106.888773,44.995885),(-106.263586,44.993788),(-105.928184,44.993647),(-105.914258,44.999986),(-105.913382,45.000941),(-105.848065,45.000396),(-105.038405,45.000345),(-105.025266,45.00029),(-105.019284,45.000329),(-105.01824,45.000437),(-104.765063,44.999183),(-104.759855,44.999066),(-104.72637,44.999518),(-104.665171,44.998618),(-104.663882,44.998869),(-104.470422,44.998453),(-104.470117,44.998453),(-104.250145,44.99822),(-104.057698,44.997431),(-104.055914,44.874986),(-104.056496,44.867034),(-104.055963,44.768236),(-104.055963,44.767962),(-104.055934,44.72372),(-104.05587,44.723422),(-104.055777,44.700466),(-104.055938,44.693881),(-104.05581,44.691343),(-104.055892,44.543341),(-104.055927,44.51773),(-104.055389,44.249983),(-104.054487,44.180381),(-104.05495,43.93809),(-104.055077,43.936535),(-104.055488,43.853477),(-104.055138,43.750421),(-104.055133,43.747105),(-104.054902,43.583852),(-104.054885,43.583512),(-104.05484,43.579368),(-104.055032,43.558603),(-104.054786,43.503072),(-104.054766,43.428914),(-104.054614,43.390949),(-104.054403,43.325914),(-104.054218,43.30437),(-104.053884,43.297047),(-104.053876,43.289801),(-104.053127,43.000585),(-104.052863,42.754569),(-104.052809,42.749966),(-104.052583,42.650062),(-104.052741,42.633982),(-104.052586,42.630917),(-104.052775,42.61159),(-104.052775,42.610813),(-104.053107,42.499964),(-104.052776,42.25822),(-104.052793,42.249962),(-104.053125,42.249962),(-104.052761,42.170278),(-104.052547,42.166801),(-104.053001,42.137254),(-104.052738,42.133769),(-104.0526,42.124963),(-104.052954,42.089077),(-104.052967,42.075004),(-104.05288,42.021761),(-104.052729,42.016318),(-104.052699,41.998673),(-104.052761,41.994967),(-104.05283,41.9946),(-104.052856,41.975958),(-104.052734,41.973007),(-104.052991,41.914973),(-104.052931,41.906143),(-104.053026,41.885464),(-104.052774,41.733401),(-104.052913,41.64519),(-104.052945,41.638167),(-104.052975,41.622931),(-104.052735,41.613676),(-104.052859,41.592254),(-104.05254,41.564274),(-104.052531,41.552723),(-104.052584,41.55265),(-104.052692,41.541154),(-104.052686,41.539111),(-104.052476,41.522343),(-104.052478,41.515754),(-104.05234,41.417865),(-104.05216,41.407662),(-104.052287,41.393307),(-104.052687,41.330569),(-104.052324,41.321144),(-104.052476,41.320961),(-104.052568,41.316202),(-104.052453,41.278202),(-104.052574,41.278019),(-104.052666,41.275251),(-104.053514,41.157257),(-104.053142,41.114457),(-104.053083,41.104985),(-104.053025,41.090274),(-104.053177,41.089725),(-104.053097,41.018045),(-104.053158,41.016809),(-104.053249,41.001406),(-104.066961,41.001504),(-104.086068,41.001563),(-104.10459,41.001543),(-104.123586,41.001626),(-104.211473,41.001591),(-104.214191,41.001568),(-104.214692,41.001657),(-104.467672,41.001473),(-104.497058,41.001805),(-104.497149,41.001828),(-104.675999,41.000957),(-104.829504,40.99927),(-104.855273,40.998048),(-105.254779,40.99821),(-105.256527,40.998191),(-105.277138,40.998173),(-105.724804,40.99691),(-105.730421,40.996886),(-106.061181,40.996999),(-106.217573,40.997734),(-106.321165,40.999123),(-106.386356,41.001144),(-106.391852,41.001176),(-106.43095,41.001752),(-106.437419,41.001795),(-106.439563,41.001978),(-106.453859,41.002057),(-106.857773,41.002663),(-107.000606,41.003444),(-107.241194,41.002804),(-107.367443,41.003073),(-107.625624,41.002124),(-107.918421,41.002036),(-108.046539,41.002064),(-108.181227,41.000455),(-108.250649,41.000114),(-108.500659,41.000112),(-108.526667,40.999608),(-108.631108,41.000156),(-108.884138,41.000094),(-109.050076,41.000659)]

[Twinside]

Could you add the output files? thanks

[DiegoNolan]

wyoming.zip

Had to zip the SVG.

[byorgey]

I'm guessing this is probably a bug in Rasterific rather than in diagrams-rasterific specifically. @Twinside , any ideas?

[Twinside]

I agree that it's probably on Rasterific side, but I don't really have time to address the issue right now

[Twinside]

This should be fixed with Rasterific v0.7.5.1 . It was a corner case of degenerate coordinate protection introduced during a previous commit. The sanitization for stroking and filling is now separate.

[byorgey]

Great, thanks @Twinside ! @DiegoNolan , I'm going to close this issue, but feel free to reopen if it's not fixed for you.