fix(precision): keep BLOCK base and TEXT/MTEXT insertion points in f64 (#311)

Three commit helpers narrowed a typed/picked point back to f32 before it
reached the persisted entity, so the coordinate was quantized to the f32
grid (worse at large/UTM extents):

- Scene::create_block_from_entities took the base point as glam::Vec3, so
  the block's local-space translation and the replacement INSERT's
  insert point were f32. Param is now DVec3 (matching the sibling
  define_block_from_owned_entities); the command_driver handler no longer
  downcasts with as_vec3().
- The MTEXT and TEXT in-place editors stored `pos` as Vec3 and built the
  committed insertion_point from it, quantizing a new label's position
  and re-quantizing an existing one on edit. Both `pos` fields are now
  DVec3.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/command_driver.rs

@@ -378,7 +378,7 @@ impl OpenCADStudio {
                 self.push_undo_snapshot(i, "BLOCK");
                 match self.tabs[i]
                     .scene
-                    .create_block_from_entities(&handles, &name, base.as_vec3())
+                    .create_block_from_entities(&handles, &name, base)
                 {
                     Ok(insert_handle) => {
                         self.tabs[i].dirty = true;
@@ -1858,7 +1858,7 @@ impl OpenCADStudio {
             } => {
                 self.tabs[i].active_cmd = None;
                 self.tabs[i].snap_result = None;
-                self.open_mtext_editor(pos.as_vec3(), handle, &initial, height);
+                self.open_mtext_editor(pos, handle, &initial, height);
             }
             CmdResult::OpenTextEditor {
                 pos,
@@ -1869,7 +1869,7 @@ impl OpenCADStudio {
                 self.tabs[i].active_cmd = None;
                 self.tabs[i].snap_result = None;
                 self.open_text_inline(
-                    pos.as_vec3(),
+                    pos,
                     handle,
                     &initial,
                     height,

src/app/mtext_editor.rs

@@ -12,7 +12,7 @@ use acadrust::entities::mtext_format::{
 };
 use acadrust::types::Vector3;
 use acadrust::{EntityType, Handle, MText};
-use glam::Vec3;
+use glam::DVec3;
 use iced::widget::text_editor;
 
 /// Character-level format toggles applied to the current selection by the
@@ -76,7 +76,7 @@ impl std::fmt::Display for JustifyChoice {
 /// Live state of the open MText editor. Absent (`None`) when no editor is up.
 pub struct MTextEditorState {
     /// World insertion point (WCS, same convention the committed entity uses).
-    pub pos: Vec3,
+    pub pos: DVec3,
     /// The editable text buffer (raw value with inline codes).
     pub content: text_editor::Content,
     /// Structured mirror of `content`, parsed via acadrust `parse_mtext` — the
@@ -133,7 +133,7 @@ pub struct MTextEditorState {
 }
 
 impl MTextEditorState {
-    pub fn new(pos: Vec3, initial: &str, height: f64, editing: Option<Handle>) -> Self {
+    pub fn new(pos: DVec3, initial: &str, height: f64, editing: Option<Handle>) -> Self {
         Self {
             pos,
             content: text_editor::Content::with_text(initial),
@@ -224,7 +224,7 @@ impl MTextEditorState {
         let h = self.height_value();
         MText {
             value: self.folded_value(),
-            insertion_point: Vector3::new(self.pos.x as f64, self.pos.y as f64, self.pos.z as f64),
+            insertion_point: Vector3::new(self.pos.x, self.pos.y, self.pos.z),
             height: h,
             rectangle_width: self.rect_width,
             attachment_point: self.attachment,
@@ -495,7 +495,7 @@ impl super::OpenCADStudio {
     /// The committed slot is chosen by the edited entity's type.
     pub(super) fn open_mtext_editor(
         &mut self,
-        pos: Vec3,
+        pos: DVec3,
         handle: Option<Handle>,
         initial: &str,
         height: f64,
@@ -1234,7 +1234,7 @@ mod cell_tests {
     // (replacing the old hand-built `\f;\C;…` prefix), and survive serialization.
     #[test]
     fn global_defaults_fold_into_spans() {
-        let mut ed = MTextEditorState::new(Vec3::ZERO, "hello world", 2.5, None);
+        let mut ed = MTextEditorState::new(DVec3::ZERO, "hello world", 2.5, None);
         ed.font = "Arial".to_string();
         ed.color_aci = 1; // red
         ed.oblique = "15".to_string();

src/app/text_inline.rs

@@ -10,7 +10,7 @@
 
 use acadrust::types::Vector3;
 use acadrust::{EntityType, Handle, Text};
-use glam::Vec3;
+use glam::DVec3;
 
 /// Which text slot of which entity an editor session reads from and writes to.
 /// `Text`/`AttDef`/`AttEnt`/`Dim`/`Tolerance` are plain (single-line box);
@@ -78,15 +78,15 @@ pub fn write_text_field(entity: &mut EntityType, field: TextEntityField, value:
     true
 }
 
-fn vec3(v: Vector3) -> Vec3 {
-    Vec3::new(v.x as f32, v.y as f32, v.z as f32)
+fn vec3(v: Vector3) -> DVec3 {
+    DVec3::new(v.x, v.y, v.z)
 }
 
 /// Live state of the open in-place TEXT editor. Absent (`None`) when no editor
 /// is up.
 pub struct TextInlineState {
     /// World insertion point (WCS, same convention the committed entity uses).
-    pub pos: Vec3,
+    pub pos: DVec3,
     /// The plain text being entered.
     pub value: String,
     /// Text height (drawing units), used when creating a new TEXT entity.
@@ -156,7 +156,7 @@ impl super::OpenCADStudio {
             EntityType::MultiLeader(ml) => {
                 (vec3(ml.context.text_location), ml.context.text_height)
             }
-            _ => (Vec3::ZERO, 0.25),
+            _ => (DVec3::ZERO, 0.25),
         };
 
         if field.is_rich() {
@@ -172,7 +172,7 @@ impl super::OpenCADStudio {
     /// commit. `handle` is `Some` when editing an existing entity.
     pub(super) fn open_text_inline(
         &mut self,
-        pos: Vec3,
+        pos: DVec3,
         handle: Option<Handle>,
         initial: &str,
         height: f64,
@@ -211,7 +211,7 @@ impl super::OpenCADStudio {
         } else {
             let mut t = Text::with_value(
                 &ed.value,
-                Vector3::new(ed.pos.x as f64, ed.pos.y as f64, ed.pos.z as f64),
+                Vector3::new(ed.pos.x, ed.pos.y, ed.pos.z),
             )
             .with_height(ed.height);
             // New text inherits the document's current text style (STYLE), not

src/scene/entity.rs

@@ -250,7 +250,7 @@ impl Scene {
         &mut self,
         handles: &[Handle],
         name: &str,
-        base: glam::Vec3,
+        base: glam::DVec3,
     ) -> Result<Handle, String> {
         let name = name.trim();
         if name.is_empty() {
@@ -299,7 +299,7 @@ impl Scene {
             .add_entity(EntityType::BlockEnd(block_end))
             .map_err(|e| e.to_string())?;
 
-        let local = EntityTransform::Translate((-base).as_dvec3());
+        let local = EntityTransform::Translate(-base);
         for (old_handle, mut entity) in source_entities {
             view::dispatch::apply_transform(&mut entity, &local);
             entity = crate::modules::draw::modify::explode::normalize_entity_for_block(entity);
@@ -313,7 +313,7 @@ impl Scene {
 
         let insert = DxfInsert::new(
             name,
-            acadrust::types::Vector3::new(base.x as f64, base.y as f64, base.z as f64),
+            acadrust::types::Vector3::new(base.x, base.y, base.z),
         );
         Ok(self.add_entity(EntityType::Insert(insert)))
     }

tests/block_hatch_export.rs

@@ -77,7 +77,7 @@ fn block_internal_hatch_reaches_export() {
     // minimal shape of "coloured fill nested in a block".
     let h = scene.add_entity(EntityType::Hatch(square_hatch(5)));
     scene
-        .create_block_from_entities(&[h], "LOGO", glam::Vec3::ZERO)
+        .create_block_from_entities(&[h], "LOGO", glam::DVec3::ZERO)
         .expect("wrap hatch into a block + insert");
     scene.populate_hatches_from_document();