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Feat: UCS icon — animated XYZ axis tripod in viewport bottom-left corner

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Screen-space UCS icon drawn on the existing selection canvas overlay.
Axes are projected from world space so the icon rotates with the camera,
always showing the correct X/Y/Z orientation relative to the drawing plane.
Each axis has its canonical color (X=red, Y=green, Z=blue) with arrowheads.
Icon visibility controlled by show_ucs_icon flag (default on); toggled by
UCSICON ON/OFF command which also updates paper-space viewport entities.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-04-03 19:25:55 +03:00
commit 6a4813ce42
4 changed files with 129 additions and 6 deletions
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4
src/app/commands.rs
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@ -2552,6 +2552,8 @@ impl H7CAD {
self.push_undo_snapshot(i, "UCSICON");
let visible = sub != "OFF";
let at_origin = sub == "ORIGIN";
// Update model-space icon flag.
self.show_ucs_icon = visible;
let mut count = 0usize;
for entity in self.tabs[i].scene.document.entities_mut() {
if let acadrust::EntityType::Viewport(vp) = entity {
@ -2564,7 +2566,7 @@ impl H7CAD {
}
self.tabs[i].dirty = true;
self.command_line.push_output(&format!(
"UCSICON {sub}: updated {count} viewport(s)."
"UCSICON {sub}: updated {count} viewport(s) + model space."
));
}
_ => {