feat(pick): select frame-like entities by clicking inside them

Images, OLE frames, wipeouts, underlays, paper-space viewports and
drawing-view borders were selectable only on their outline. Each now
carries an interior pick surface (pick_tris over its rectangle, or the
triangulated clip polygon for a clipped underlay), ranked below edge
and fill hits so content drawn inside still wins the click. The
layout's own sheet ("overall") viewport is excluded — identified by
the Layout object's viewport link, since DWG files carry viewport
id = 0 and some center the sheet viewport off-origin — or it would
swallow every click over the real viewports beneath it. Drawing-view
borders draw nothing normally; they emit an invisible pick-only wire
whose rect outline appears while selected.

Co-Authored-By: Claude Fable 5 <[email protected]>

src/entities/common.rs

@@ -119,6 +119,13 @@ pub fn format_angle(value_rad: f64) -> String {
     }
 }
 
+/// Two interior triangles covering a quad (flat list, 6 vertices) — the
+/// click-anywhere pick surface for frame-like entities (image, OLE frame,
+/// underlay, wipeout). Corners in ring order.
+pub fn quad_pick_tris(c: &[[f64; 3]; 4]) -> Vec<[f64; 3]> {
+    vec![c[0], c[1], c[2], c[0], c[2], c[3]]
+}
+
 pub fn square_grip(id: usize, world: glam::DVec3) -> GripDef {
     GripDef {
         id,

src/entities/ole2frame.rs

@@ -43,7 +43,14 @@ fn to_truck(ole: &Ole2Frame) -> TruckEntity {
     ];
     let center = glam::DVec3::new(cx, cy, z);
     TruckEntity {
-        pick_tris: Vec::new(),
+        // Interior pick surface: the frame selects on a click anywhere
+        // inside, not just on its border.
+        pick_tris: crate::entities::common::quad_pick_tris(&[
+            [x0, y0, z],
+            [x1, y0, z],
+            [x1, y1, z],
+            [x0, y1, z],
+        ]),
         object: TruckObject::Lines(pts),
         snap_pts: vec![(center, SnapHint::Center)],
         tangent_geoms: vec![],

src/entities/raster_image.rs

@@ -136,7 +136,9 @@ impl TruckConvertible for RasterImage {
             path.is_empty() || crate::scene::model::image_model::resolve_image(path).is_some();
         if resolvable {
             return Some(TruckEntity {
-                pick_tris: Vec::new(),
+                // Interior pick surface: the image selects on a click anywhere
+                // inside its frame, not just on the border.
+                pick_tris: crate::entities::common::quad_pick_tris(&corners),
                 object: TruckObject::Lines(pts),
                 snap_pts: vec![],
                 tangent_geoms: vec![],
@@ -223,7 +225,7 @@ impl TruckConvertible for RasterImage {
         }
 
         Some(TruckEntity {
-            pick_tris: Vec::new(),
+            pick_tris: crate::entities::common::quad_pick_tris(&corners),
             object: TruckObject::Text(groups),
             snap_pts: vec![],
             tangent_geoms: vec![],
@@ -457,7 +459,9 @@ impl TruckConvertible for Wipeout {
         };
 
         Some(TruckEntity {
-            pick_tris: Vec::new(),
+            // Interior pick surface — a wipeout reads as a solid patch, so a
+            // click anywhere on it should select it.
+            pick_tris: crate::entities::common::quad_pick_tris(&corners),
             object: TruckObject::Lines(pts),
             snap_pts: vec![],
             tangent_geoms: vec![],

src/entities/underlay.rs

@@ -52,8 +52,12 @@ impl TruckConvertible for Underlay {
             }
             // Insertion grip.
             let key: Vec<[f64; 3]> = pts.clone();
+            // Interior pick surface over the clip polygon so the underlay
+            // selects on a click anywhere inside, not just on its outline.
+            let ring: Vec<[f64; 3]> = world_verts.iter().map(|v| [v.x, v.y, v.z]).collect();
+            let pick_tris = crate::entities::mesh::triangulate_planar(&ring);
             Some(TruckEntity {
-                pick_tris: Vec::new(),
+                pick_tris,
                 object: TruckObject::Lines(pts),
                 snap_pts: vec![(glam::DVec3::new(self.insertion_point.x, self.insertion_point.y, self.insertion_point.z), SnapHint::Node)],
                 tangent_geoms: vec![],