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fix(clipboard): paste anchor at bounding-box lower-left, not center (#285)

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COPYCLIP/CUTCLIP used the mean of each entity's bounding-box centre as the
paste anchor. Standard clipboard behaviour puts the lower-left corner of the
box enclosing all copied items under the cursor. Union each entity's bbox min
corner instead, and rename clipboard_centroid -> clipboard_base (COPYBASE also
stores a picked point there, so "centroid" was inaccurate).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-10 11:16:13 +03:00
commit c249a99d4c
6 changed files with 40 additions and 38 deletions
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35
src/app/helpers.rs
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@ -252,32 +252,31 @@ pub(super) fn polar_constrain_near(
// ── Clipboard / selection helpers ──────────────────────────────────────────
/// Cheap copy/paste anchor: the mean of each entity's bounding-box centre.
/// Replaces averaging every tessellated wire vertex, which cost O(total
/// geometry) and stalled a whole-drawing copy. The anchor only sets which point
/// of the selection sits under the cursor, so a per-entity bbox centre is an
/// equally valid, far cheaper origin.
pub(super) fn entities_centroid_by_bbox(
/// Copy/paste anchor: the lower-left corner of the bounding box that encloses
/// every copied entity. Standard clipboard behaviour puts this corner under the
/// cursor at paste time, so the whole selection drops down-and-right of the pick.
///
/// Unions each entity's own bounding box (O(entities)) rather than averaging
/// every tessellated wire vertex, which cost O(total geometry) and stalled a
/// whole-drawing copy. The per-entity `min` corners give the exact enclosing
/// box's lower-left.
pub(super) fn entities_lower_left_by_bbox(
doc: &acadrust::CadDocument,
handles: &[acadrust::Handle],
) -> glam::DVec3 {
let mut sum = glam::DVec3::ZERO;
let mut count = 0usize;
let mut min = glam::DVec3::splat(f64::INFINITY);
let mut any = false;
for &h in handles {
let Some(e) = doc.get_entity(h) else { continue };
let bb = e.as_entity().bounding_box();
let c = glam::DVec3::new(
(bb.min.x + bb.max.x) * 0.5,
(bb.min.y + bb.max.y) * 0.5,
(bb.min.z + bb.max.z) * 0.5,
);
if c.x.is_finite() && c.y.is_finite() && c.z.is_finite() {
sum += c;
count += 1;
let lo = glam::DVec3::new(bb.min.x, bb.min.y, bb.min.z);
if lo.x.is_finite() && lo.y.is_finite() && lo.z.is_finite() {
min = min.min(lo);
any = true;
}
}
if count > 0 {
sum / count as f64
if any {
min
} else {
glam::DVec3::ZERO
}