feat(frame): complete frame controls

Preserve frame geometry for selection while separating viewport and plot visibility across supported reference entities.

Refs #642

src/entities/extended.rs

@@ -301,6 +301,11 @@ fn geo_marker_lines(data: &GeoPositionMarkerData) -> Vec<[f64; 3]> {
 fn point_cloud_lines(data: &PointCloudData) -> Vec<[f64; 3]> {
     let mut points = Vec::new();
     push_box(&mut points, data.extents_min, data.extents_max);
+    points
+}
+
+fn point_cloud_clip_lines(data: &PointCloudData) -> Vec<[f64; 3]> {
+    let mut points = Vec::new();
     if data.show_clipping {
         for clip in &data.clippings {
             if clip.vertices.len() < 2 {
@@ -323,6 +328,11 @@ fn point_cloud_lines(data: &PointCloudData) -> Vec<[f64; 3]> {
 fn point_cloud_ex_lines(data: &PointCloudExData) -> Vec<[f64; 3]> {
     let mut points = Vec::new();
     push_box(&mut points, data.extents_min, data.extents_max);
+    points
+}
+
+fn point_cloud_ex_clip_lines(data: &PointCloudExData) -> Vec<[f64; 3]> {
+    let mut points = Vec::new();
     if data.show_cropping {
         for crop in &data.croppings {
             if crop.points.len() < 2 {
@@ -339,6 +349,14 @@ fn point_cloud_ex_lines(data: &PointCloudExData) -> Vec<[f64; 3]> {
     points
 }
 
+pub(crate) fn point_cloud_frame_lines(entity: &ExtendedEntity) -> Option<Vec<[f64; 3]>> {
+    match &entity.data {
+        ExtendedEntityData::PointCloud(data) => Some(point_cloud_clip_lines(data)),
+        ExtendedEntityData::PointCloudEx(data) => Some(point_cloud_ex_clip_lines(data)),
+        _ => None,
+    }
+}
+
 fn camera_lines(document: &acadrust::CadDocument, view_handle: Handle) -> Vec<[f64; 3]> {
     let Some(view) = document.views.iter().find(|view| view.handle == view_handle) else {
         return Vec::new();