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AutoCAD writes $ANGBASE in degrees (a drawing whose angles run clockwise from north has 90.0); CADCraft read and wrote it as radians, so such a drawing's angle base came in as 90 radians (about 116.6 degrees), turning typed angles, polar tracking and angles shown in Properties. The reader now converts to radians (the variable's unit), the writer back, and the DWG reader's hand-off of the value in DXF form gives degrees. Co-authored-by: Cody Vogt <18035288+codyvogt@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
34 lines
1.6 KiB
Rust
34 lines
1.6 KiB
Rust
//! The angle settings round-trip through DXF: `$ANGBASE` (group 50) in degrees, as AutoCAD writes
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//! it (a drawing measured from north has 90.0), held in radians; `$ANGDIR` and `$AUNITS`
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//! (group 70) as integers.
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use cadcraft_doc::{Drawing, HVal};
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#[test]
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fn angbase_angdir_aunits_round_trip_through_dxf() {
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let mut d = Drawing::new_metric();
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d.header.set_f64("ANGBASE", std::f64::consts::FRAC_PI_2);
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d.header.set_i64("ANGDIR", 1);
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d.header.set_i64("AUNITS", 3);
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let text = cadcraft_io::write_dxf(&d);
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// Written in degrees.
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let lines: Vec<&str> = text.lines().map(str::trim).collect();
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let at = lines.iter().position(|l| *l == "$ANGBASE").expect("$ANGBASE is written");
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let written: f64 = lines.get(at + 2).and_then(|v| v.parse().ok()).expect("a number");
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assert!((written - 90.0).abs() < 1e-9, "$ANGBASE written as {written}");
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let r = cadcraft_io::read_dxf(text.as_bytes()).unwrap();
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let base = r.header.f64("ANGBASE", 0.0);
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assert!((base - std::f64::consts::FRAC_PI_2).abs() < 1e-12, "$ANGBASE read back as {base}");
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assert_eq!(r.header.get("ANGDIR"), Some(&HVal::Int(1)));
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assert_eq!(r.header.get("AUNITS"), Some(&HVal::Int(3)));
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}
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#[test]
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fn angbase_in_degrees_is_read_as_radians() {
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// What AutoCAD writes for a drawing whose angles run clockwise from north.
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let text = "0\nSECTION\n2\nHEADER\n9\n$ANGBASE\n50\n90.0\n9\n$ANGDIR\n70\n1\n0\nENDSEC\n0\nEOF\n";
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let d = cadcraft_io::read_dxf(text.as_bytes()).unwrap();
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let base = d.header.f64("ANGBASE", 0.0);
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assert!((base - std::f64::consts::FRAC_PI_2).abs() < 1e-12, "$ANGBASE 90.0 read as {base} radians");
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}
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