the httpgd plotting device does not always plot sf objects correctly. Base R graphics plot these objects just fine. This issue seems to be independent of the actual plotting function used; for example, the issue is reproduced if I use the sf::plot() method or ggplot(). The problems can be more severe for more complex objects, but here is a simple example that illustrates the issue.

The test object is defined at the end of the issue. Apologies for the long code block but using dput seemed to be the most straightforward way to provide a reprex.

Base R

plot(test)

httpgd

library(httpgd)
hgd()
plot(test)
hgd_browse()

data definition

R code

```r library(sf) # data example test = structure(list(NodeID = "EX087", Shape = structure(list(structure(list( structure(c(488775.5228, 488843.0498, 488948.8731, 488986.8621, 489000.2785, 489038.7049, 489067.179, 489110.062, 489161.9624, 489209.911, 489245.6103, 489315.2178, 489529.8837, 489592.8637, 489718.3782, 489780.8688, 489812.1378, 489875.1354, 489906.2397, 489937.4943, 489969.2796, 490000.5326, 490031.8574, 490062.9505, 490126.1266, 490151.1669, 490210.8898, 490232.6628, 490341.458, 490358.2152, 490425.2737, 490491.6068, 490535.812, 490540.2727, 490559.2144, 490582.7818, 490635.3596, 490669.9734, 490700.7764, 490733.732, 490763.3307, 490809.2792, 490839.4035, 490847.8294, 490893.0576, 490936.8019, 490965.1894, 490964.694, 490944.6394, 490912.2444, 490889.88, 490856.8738, 490855.2394, 490869.2261, 490879.4039, 490901.8054, 490919.5985, 490938.6382, 490958.108, 490974.3097, 491007.2195, 491017.4166, 491079.3063, 491180.5032, 491196.2072, 491271.8714, 491292.4604, 491334.8718, 491385.4792, 491489.6519, 491546.4303, 491604.9438, 491680.1011, 491710.708, 491728.5993, 491748.7012, 491777.1038, 491842.1914, 491934.1098, 491993.2883, 492030.6104, 492058.977, 492065.0279, 492077.9632, 492118.6216, 492153.0712, 492180.4039, 492193.328, 492253.9871, 492351.5379, 492359.4, 492361.0739, 492394.5701, 492419.0303, 492446.3214, 492463.0479, 492503.7099, 492514.3201, 492542.803, 492615.2977, 492683.8725, 492722.8801, 492753.4107, 492781.9845, 492844.8424, 492924.0816, 493005.9751, 493075.0619, 493111.8842, 493144.2517, 493194.9158, 493226.7473, 493232.3419, 493306.4169, 493367.6865, 493404.5633, 493457.4687, 493505.9954, 493549.4947, 493594.0838, 493605.147, 493629.1513, 493649.1836, 493666.5391, 493682.1362, 493696.1085, 493743.3785, 493769.9586, 493780.1076, 493798.9913, 493766.8127, 493695.0932, 493758.0168, 493807.1777, 493833.81, 493862.8919, 493926.4194, 493991.0035, 494007.9134, 493992.6784, 494012.2595, 494025.7196, 494043.4492, 494086.9474, 494109.344, 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"EPSG:26910", wkt = "PROJCRS[\"NAD83 / UTM zone 10N\",\n BASEGEOGCRS[\"NAD83\",\n DATUM[\"North American Datum 1983\",\n ELLIPSOID[\"GRS 1980\",6378137,298.257222101,\n LENGTHUNIT[\"metre\",1]]],\n PRIMEM[\"Greenwich\",0,\n ANGLEUNIT[\"degree\",0.0174532925199433]],\n ID[\"EPSG\",4269]],\n CONVERSION[\"UTM zone 10N\",\n METHOD[\"Transverse Mercator\",\n ID[\"EPSG\",9807]],\n PARAMETER[\"Latitude of natural origin\",0,\n ANGLEUNIT[\"degree\",0.0174532925199433],\n ID[\"EPSG\",8801]],\n PARAMETER[\"Longitude of natural origin\",-123,\n ANGLEUNIT[\"degree\",0.0174532925199433],\n ID[\"EPSG\",8802]],\n PARAMETER[\"Scale factor at natural origin\",0.9996,\n SCALEUNIT[\"unity\",1],\n ID[\"EPSG\",8805]],\n PARAMETER[\"False easting\",500000,\n LENGTHUNIT[\"metre\",1],\n ID[\"EPSG\",8806]],\n PARAMETER[\"False northing\",0,\n LENGTHUNIT[\"metre\",1],\n ID[\"EPSG\",8807]]],\n CS[Cartesian,2],\n AXIS[\"(E)\",east,\n ORDER[1],\n LENGTHUNIT[\"metre\",1]],\n AXIS[\"(N)\",north,\n ORDER[2],\n LENGTHUNIT[\"metre\",1]],\n USAGE[\n SCOPE[\"Engineering survey, topographic mapping.\"],\n AREA[\"North America - between 126Â°W and 120Â°W - onshore and offshore. Canada - British Columbia; Northwest Territories; Yukon. United States (USA) - California; Oregon; Washington.\"],\n BBOX[30.54,-126,81.8,-119.99]],\n ID[\"EPSG\",26910]]"), class = "crs"), n_empty = 0L)), row.names = 1L, sf_column = "Shape", agr = structure(c(NodeID = NA_integer_), .Label = c("constant", "aggregate", "identity"), class = "factor"), class = c("sf", "data.frame")) ```

nx10 / httpgd

some sf objects do not plot correctly #75

Base R

httpgd

data definition