Ah ghrr, I missed one argin in my wrapping (the dfRotation) and probably because the dfMaxAngleStepSizeDegrees has a default value, an error was not triggered. Now it works. Sorry for the noise.
From: Even Rouault <[email protected]> Sent: Thursday, June 16, 2022 5:49 PM To: Joaquim Manuel Freire Luís <[email protected]>; [email protected] Subject: Re: [gdal-dev] dfMaxAngleStepSizeDegrees in ApproximateArcAngles I can't replicate that. Below the output with the Python bindings that directly map OGR_G_ApproximateArcAngles(): >>> from osgeo import ogr >>> g = ogr.ApproximateArcAngles(0, 0, 0, 1, 1, 0, 0, -90, 0) >>> g.FlattenTo2D() >>> g.ExportToWkt() 'LINESTRING (1 0,0.997668769190539 0.068242413364671,0.990685946036331 0.136166649096247,0.979084087682323 0.203456013052634,0.962917287347799 0.269796771157024,0.942260922118821 0.334879612170986,0.917211301505453 0.398401089846241,0.887885218402375 0.460065037731152,0.854419404546489 0.519583950035434,0.816969893010442 0.576680322114867,0.77571129070442 0.631087944326053,0.730835964278124 0.682553143218654,0.682553143218654 0.730835964278124,0.631087944326053 0.77571129070442,0.576680322114867 0.816969893010442,0.519583950035434 0.854419404546489,0.460065037731152 0.887885218402375,0.398401089846242 0.917211301505453,0.334879612170986 0.942260922118821,0.269796771157024 0.962917287347799,0.203456013052634 0.979084087682323,0.136166649096247 0.990685946036331,0.068242413364671 0.997668769190539,0.0 1.0)' >>> g = ogr.ApproximateArcAngles(0, 0, 0, 1, 1, 0, 0, -90, 10) >>> g.FlattenTo2D() >>> g.ExportToWkt() 'LINESTRING (1 0,0.984807753012208 0.17364817766693,0.939692620785908 0.342020143325669,0.866025403784439 0.5,0.766044443118978 0.642787609686539,0.642787609686539 0.766044443118978,0.5 0.866025403784439,0.342020143325669 0.939692620785908,0.17364817766693 0.984807753012208,0.0 1.0)' >>> For the inc=0 case, note that there's a x/y inversion compared to your output. The inc=10 case has 10 points in its output as expected Even Le 16/06/2022 à 18:27, Joaquim Manuel Freire Luís a écrit : Even, I wrapped OGR_G_ApproximateArcAngles() in Julia and I think there is something wrong with the dfMaxAngleStepSizeDegrees argument (here shortcut to ‘inc’) This is fine (just repeating the default 0.0 value). Note, I’m dropping the z (=0) argin but that’s only the julia wrapper interface. D = GMT.Gdal.arcellipse(0, 0, 1., 1., 0., -90., inc=0.) BoundingBox: [6.123233995736766e-17, 1.0, 0.0, 1.0] 24×2 GMTdataset{Float64, 2} Row │ x y │ Float64 Float64 ─────┼──────────────────────── 1 │ 6.12323e-17 1.0 2 │ 0.0682424 0.997669 3 │ 0.136167 0.990686 4 │ 0.203456 0.979084 5 │ 0.269797 0.962917 ⋮ │ ⋮ ⋮ 20 │ 0.962917 0.269797 21 │ 0.979084 0.203456 22 │ 0.990686 0.136167 23 │ 0.997669 0.0682424 24 │ 1.0 0.0 But if I use for example 10 (or any other number) the dfEndAngle is no longer respected D = GMT.Gdal.arcellipse(0, 0., 1., 1., 0., -90., inc=10.) BoundingBox: [6.123233995736766e-17, 0.9993908270190958, -0.17364817766693033, 1.0] 26×2 GMTdataset{Float64, 2} Row │ x y │ Float64 Float64 ─────┼───────────────────────── 1 │ 6.12323e-17 1.0 2 │ 0.0697565 0.997564 3 │ 0.139173 0.990268 4 │ 0.207912 0.978148 5 │ 0.275637 0.961262 6 │ 0.34202 0.939693 7 │ 0.406737 0.913545 8 │ 0.469472 0.882948 ⋮ │ ⋮ ⋮ 19 │ 0.951057 0.309017 20 │ 0.970296 0.241922 21 │ 0.984808 0.173648 22 │ 0.994522 0.104528 23 │ 0.999391 0.0348995 24 │ 0.999391 -0.0348995 25 │ 0.994522 -0.104528 26 │ 0.984808 -0.173648 Joaquim _______________________________________________ gdal-dev mailing list [email protected]<mailto:[email protected]> https://lists.osgeo.org/mailman/listinfo/gdal-dev -- http://www.spatialys.com My software is free, but my time generally not.
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