refactor: remove remaining world_offset vestiges in app/

Clean up the last zero-valued world_offset locals outside the scene
tessellation core: the UCS wire-affine / grid-basis origin shift
(document.rs), the coordinate readout (view.rs), grip absolute-apply
(update.rs), the dead properties-edit re-offset guard, the MTEXT preview
glyph-box shift (mtext_editor.rs), and the cross-drawing paste correction
(commands.rs / cmd_result.rs) — including the now-dead
`clipboard_world_offset` field. Coordinates are absolute throughout.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

src/app/cmd_result.rs

@@ -604,19 +604,7 @@ impl OpenCADStudio {
                 if self.clipboard.is_empty() {
                     self.command_line.push_error("Clipboard is empty.");
                 } else {
-                    // The centroid was measured in the source drawing's
-                    // offset-relative frame and `base_pt` is in this drawing's;
-                    // correct by the world_offset difference so a cross-drawing
-                    // paste lands at the cursor instead of drifting by the
-                    // offset gap. Zero for a same-drawing paste. (#135)
-                    let src_wo = self.clipboard_world_offset;
-                    let tgt_wo = [0.0_f64; 3];
-                    let wo_corr = glam::DVec3::new(
-                        tgt_wo[0] - src_wo[0],
-                        tgt_wo[1] - src_wo[1],
-                        tgt_wo[2] - src_wo[2],
-                    );
-                    let delta = base_pt - self.clipboard_centroid + wo_corr;
+                    let delta = base_pt - self.clipboard_centroid;
                     let translate = crate::command::EntityTransform::Translate(delta);
                     self.push_undo_snapshot(i, "PASTECLIP");
                     let count = self.clipboard.len();

src/app/commands.rs

@@ -540,7 +540,6 @@ impl OpenCADStudio {
                     self.clipboard_centroid = super::helpers::entities_centroid(
                         &self.tabs[i].scene.wire_models_for(&handles),
                     );
-                    self.clipboard_world_offset = [0.0_f64; 3];
                     self.clipboard = entities;
                     self.clipboard_deps = super::ClipboardDeps::capture(
                         &self.tabs[i].scene.document,
@@ -573,7 +572,6 @@ impl OpenCADStudio {
                     self.clipboard_centroid = super::helpers::entities_centroid(
                         &self.tabs[i].scene.wire_models_for(&handles),
                     );
-                    self.clipboard_world_offset = [0.0_f64; 3];
                     let count = entities.len();
                     self.clipboard = entities;
                     self.clipboard_deps = super::ClipboardDeps::capture(
@@ -595,19 +593,7 @@ impl OpenCADStudio {
                     self.command_line.push_error("Clipboard is empty.");
                 } else {
                     let wires = self.tabs[i].scene.wires_for_entities(&self.clipboard);
-                    // The preview wires are tessellated in THIS drawing's
-                    // offset-relative frame, but the stored centroid is in the
-                    // source drawing's. Shift it by the world_offset difference
-                    // so the ghost tracks the cursor instead of drifting by the
-                    // offset gap. Zero within one drawing. (#135)
-                    let src_wo = self.clipboard_world_offset;
-                    let tgt_wo = [0.0_f64; 3];
-                    let centroid = self.clipboard_centroid
-                        + glam::DVec3::new(
-                            src_wo[0] - tgt_wo[0],
-                            src_wo[1] - tgt_wo[1],
-                            src_wo[2] - tgt_wo[2],
-                        );
+                    let centroid = self.clipboard_centroid;
                     use crate::modules::draw::clipboard::paste::PasteCommand;
                     // The ghost anchor is a display-only offset; the precise
                     // paste delta is computed in f64 at commit time.

src/app/document.rs

@@ -288,11 +288,10 @@ impl DocumentTab {
             return glam::Mat4::IDENTITY;
         }
         let (o, x, y, z) = self.ucs_xform().axes();
-        let wo = [0.0_f64; 3];
         let origin = glam::Vec3::new(
-            o.x - wo[0] as f32,
-            o.y - wo[1] as f32,
-            o.z - wo[2] as f32,
+            o.x as f32,
+            o.y as f32,
+            o.z as f32,
         );
         glam::Mat4::from_cols(
             x.extend(0.0),
@@ -321,11 +320,10 @@ impl DocumentTab {
         }
         let xf = self.ucs_xform();
         let (o, ..) = xf.axes();
-        let wo = [0.0_f64; 3];
         let origin = glam::Vec3::new(
-            o.x - wo[0] as f32,
-            o.y - wo[1] as f32,
-            o.z - wo[2] as f32,
+            o.x as f32,
+            o.y as f32,
+            o.z as f32,
         );
         (origin, xf.rotation_mat())
     }

src/app/mod.rs

@@ -372,12 +372,6 @@ pub(super) struct OpenCADStudio {
     clipboard: Vec<acadrust::EntityType>,
     /// Centroid of the clipboard entities (world XY plane).
     clipboard_centroid: glam::DVec3,
-    /// The source drawing's `world_offset` at copy time. The centroid above is
-    /// measured in that drawing's offset-relative frame; pasting into a drawing
-    /// with a different offset (e.g. a large-coordinate file → a fresh one)
-    /// must correct the paste translation by the offset difference, else the
-    /// objects land `source_offset − target_offset` away from the cursor.
-    clipboard_world_offset: [f64; 3],
     /// Table records (layer / linetype / text + dim style) the clipboard
     /// entities reference, captured from the source drawing at copy time so a
     /// paste into a *different* drawing can recreate any that are missing —
@@ -1809,7 +1803,6 @@ impl OpenCADStudio {
             update_notice_body: None,
             clipboard: Vec::new(),
             clipboard_centroid: glam::DVec3::ZERO,
-            clipboard_world_offset: [0.0; 3],
             clipboard_deps: ClipboardDeps::default(),
             shift_down: false,
             mtext_editor: None,

src/app/mtext_editor.rs

@@ -395,7 +395,6 @@ impl super::OpenCADStudio {
         let Some(ed) = self.mtext_editor.as_ref() else { return };
         let mt = ed.build_mtext();
         let entity = EntityType::MText(mt.clone());
-        let woff = [0.0_f64; 3];
         let anno = self.tabs[i].scene.annotation_scale;
         let wires: Vec<WireModel> = tessellate::tessellate(
             &self.tabs[i].scene.document,
@@ -409,16 +408,8 @@ impl super::OpenCADStudio {
             anno,
             None,
         );
-        // Per-character boxes in the same offset-subtracted frame as the
-        // preview wires (tessellate removes world_offset; mirror that).
-        let mut boxes = crate::entities::mtext::glyph_boxes(&mt, &self.tabs[i].scene.document);
-        let (ox, oy) = (woff[0] as f32, woff[1] as f32);
-        for b in &mut boxes {
-            b.xmin -= ox;
-            b.xmax -= ox;
-            b.ymin -= oy;
-            b.ymax -= oy;
-        }
+        // Per-character boxes share the preview wires' absolute coordinate frame.
+        let boxes = crate::entities::mtext::glyph_boxes(&mt, &self.tabs[i].scene.document);
         if let Some(ed) = self.mtext_editor.as_mut() {
             ed.preview_wires = wires;
             ed.glyph_boxes = boxes;

src/app/properties.rs

@@ -652,18 +652,6 @@ impl OpenCADStudio {
             _ => {}
         }
 
-        // Commands pick points in local space (camera coordinates with world_offset
-        // already subtracted). Re-add world_offset so the entity lands at the correct
-        // DXF coordinate. Skip for paper-space entities (they use sheet mm coords).
-        let is_paper = self.tabs[i].scene.current_layout != "Model";
-        if !is_paper {
-            let wo = [0.0_f64; 3];
-            if wo[0] != 0.0 || wo[1] != 0.0 || wo[2] != 0.0 {
-                let delta = acadrust::types::Vector3::new(wo[0], wo[1], wo[2]);
-                let t = acadrust::types::Transform::from_translation(delta);
-                entity.apply_transform(&t);
-            }
-        }
 
         if matches!(&entity, acadrust::EntityType::Viewport(_))
             && self.tabs[i].scene.current_layout != "Model"

src/app/update.rs

@@ -2713,18 +2713,10 @@ impl OpenCADStudio {
                         }
                     }
 
-                    // Paper-space entities use sheet coordinates (no world_offset).
-                    // Only add world_offset when converting local → DXF space in model space.
-                    let wo_vec = if self.tabs[i].scene.current_layout == "Model" {
-                        let wo = [0.0_f64; 3];
-                        glam::DVec3::new(wo[0], wo[1], wo[2])
-                    } else {
-                        glam::DVec3::ZERO
-                    };
                     let apply = if grip.is_translate {
                         GripApply::Translate(snapped - grip.last_world)
                     } else {
-                        GripApply::Absolute(snapped + wo_vec)
+                        GripApply::Absolute(snapped)
                     };
                     self.tabs[i]
                         .scene

src/app/view.rs

@@ -949,13 +949,7 @@ impl OpenCADStudio {
                         // The readout follows the active pane's UCS — model space
                         // or inside a floating viewport (no-op without a UCS).
                         if tab.editing_model_space() {
-                            let wo = [0.0_f64; 3];
-                            let wcs = glam::Vec3::new(
-                                lc.x + wo[0] as f32,
-                                lc.y + wo[1] as f32,
-                                lc.z + wo[2] as f32,
-                            );
-                            tab.ucs_xform().to_ucs(wcs)
+                            tab.ucs_xform().to_ucs(lc)
                         } else {
                             lc
                         }