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fix(snap): align extension tracking

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Require OTRACK crossings to include the active Extension ray and resolve Shift constraints consistently across preview, grips, and clicks.\n\nRefs #716
This commit is contained in:
Hakan Seven 2026-08-09 23:55:06 +03:00
commit 8016b79ddf
2 changed files with 230 additions and 236 deletions
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271
src/app/update/viewport.rs
View file

@ -157,6 +157,68 @@ impl OpenCADStudio {
Some((base, target)) Some((base, target))
} }
fn active_axis_lock(
&mut self,
tab: usize,
cursor: glam::DVec3,
base: glam::DVec3,
allowed: bool,
) -> Option<glam::DVec3> {
if self.shift_down && allowed {
if self.axis_lock_dir.is_none() {
let ucs = self.tabs[tab].ucs_xform();
self.axis_lock_dir = axis_lock_capture(
cursor,
base,
self.polar_mode,
self.polar_increment_deg,
&ucs,
self.isometric_drafting,
self.iso_plane,
self.snap_angle_deg,
);
}
} else {
self.axis_lock_dir = None;
}
self.axis_lock_dir
}
fn active_otrack_hit(
&self,
tab: usize,
cursor: glam::DVec3,
snap: Option<crate::snap::SnapResult>,
base: Option<glam::DVec3>,
drafting: bool,
view_rot: glam::Mat4,
eye: glam::DVec3,
bounds: iced::Rectangle,
) -> Option<crate::snap::OtrackHit> {
if snap.is_some_and(|hit| hit.snap_type != crate::snap::SnapType::Extension) {
return None;
}
let required_crossing_ray = match snap {
Some(extension) => Some((extension.extension_origin?, extension.extension_dir?)),
None => None,
};
let step = (self.polar_mode && drafting).then_some(self.polar_increment_deg);
let (_, (ucs_x, ucs_y, _)) = self.drafting_grid_basis(tab);
let hit = self.snapper.otrack_snap(
cursor,
view_rot,
eye,
bounds,
step,
base,
required_crossing_ray,
self.ortho_mode && drafting,
ucs_x.as_dvec3(),
ucs_y.as_dvec3(),
)?;
Some(hit)
}
/// Write PDSIZE from the dialog buffer with the current relative/absolute /// Write PDSIZE from the dialog buffer with the current relative/absolute
/// sign. A relative size is stored negative; absolute positive. Switching to /// sign. A relative size is stored negative; absolute positive. Switching to
/// absolute with an empty/zero size seeds a positive value from the current /// absolute with an empty/zero size seeds a positive value from the current
@ -1094,9 +1156,6 @@ impl OpenCADStudio {
self.tabs[i].snap_result = snap_hit; self.tabs[i].snap_result = snap_hit;
// Grip edits use the same tracking-point acquisition and OTRACK
// resolution as normal interactive point commands.
let otrack_hit = {
self.snapper.update_otrack_dwell( self.snapper.update_otrack_dwell(
snap_hit, snap_hit,
&snap_candidates, &snap_candidates,
@ -1105,36 +1164,28 @@ impl OpenCADStudio {
bounds, bounds,
Instant::now(), Instant::now(),
); );
let axis_lock = self.active_axis_lock(i, raw, base, true);
if snap_hit.is_none() { let otrack_hit = if axis_lock.is_none() {
let polar_step = if self.polar_mode { self.active_otrack_hit(
Some(self.polar_increment_deg) i,
} else {
None
};
let (_, (ucs_x, ucs_y, _)) = self.drafting_grid_basis(i);
self.snapper.otrack_snap(
raw, raw,
snap_hit,
Some(base),
true,
view_rot, view_rot,
eye, eye,
bounds, bounds,
polar_step,
Some(grip.origin_world),
self.ortho_mode,
ucs_x.as_dvec3(),
ucs_y.as_dvec3(),
) )
} else { } else {
None None
}
}; };
self.otrack_active = otrack_hit.map(|hit| (hit.base, hit.dir)); self.otrack_active = otrack_hit.map(|hit| (hit.base, hit.dir));
self.otrack_kind = otrack_hit.map(|hit| hit.kind); self.otrack_kind = otrack_hit.map(|hit| hit.kind);
let mut snapped = if let Some(hit) = otrack_hit { let mut snapped = if let Some(dir) = axis_lock {
axis_lock_apply(snap_hit.map(|hit| hit.world).unwrap_or(raw), base, dir)
} else if let Some(hit) = otrack_hit {
hit.aligned hit.aligned
} else { } else {
snap_hit.map(|s| s.world).unwrap_or(raw) snap_hit.map(|s| s.world).unwrap_or(raw)
@ -1144,29 +1195,8 @@ impl OpenCADStudio {
s.screen.y += tile_b.y; s.screen.y += tile_b.y;
} }
// Hard axis lock (#312) works for grip drags too: Shift if axis_lock.is_none()
// pins the drag to the nearest polar/ortho ray from the && otrack_hit.is_none()
// grip's origin, osnap hits included.
if self.shift_down {
if self.axis_lock_dir.is_none() {
let ucs_xf = self.tabs[i].ucs_xform();
self.axis_lock_dir = axis_lock_capture(
raw,
grip.origin_world,
self.polar_mode,
self.polar_increment_deg,
&ucs_xf,
self.isometric_drafting,
self.iso_plane,
self.snap_angle_deg,
);
}
} else {
self.axis_lock_dir = None;
}
if let Some(dir) = self.axis_lock_dir {
snapped = axis_lock_apply(snapped, grip.origin_world, dir);
} else if otrack_hit.is_none()
&& !snap_hit.is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid) && !snap_hit.is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid)
{ {
let base = grip.origin_world; let base = grip.origin_world;
@ -1537,10 +1567,22 @@ impl OpenCADStudio {
) )
}; };
// Object Snap Tracking: update dwell, then align the cursor let wants_point = self.tabs[i].active_cmd.as_ref().is_some_and(|command| {
// to a tracking ray (and store the alignment so a typed !command.needs_entity_pick()
// distance can place a point along it — issue #69). && !command.needs_tangent_pick()
let otrack_hit = { && !command.is_selection_gathering()
});
let axis_lock = if let Some(base) = self.last_point {
self.active_axis_lock(
i,
cursor_world,
base,
wants_point && !is_window_corner,
)
} else {
self.axis_lock_dir = None;
None
};
self.snapper.update_otrack_dwell( self.snapper.update_otrack_dwell(
self.tabs[i].snap_result, self.tabs[i].snap_result,
&snap_candidates, &snap_candidates,
@ -1549,8 +1591,6 @@ impl OpenCADStudio {
bounds, bounds,
Instant::now(), Instant::now(),
); );
// Parallel snap: acquire the reference line under the
// cursor (independent of OTRACK). (#277)
self.snapper.update_parallel( self.snapper.update_parallel(
cursor_world.as_vec3(), cursor_world.as_vec3(),
&snap_candidates, &snap_candidates,
@ -1559,34 +1599,19 @@ impl OpenCADStudio {
bounds, bounds,
Instant::now(), Instant::now(),
); );
if self.tabs[i].snap_result.is_none() let otrack_hit = if axis_lock.is_none() {
|| self.tabs[i] self.active_otrack_hit(
.snap_result i,
.is_some_and(|s| s.snap_type == crate::snap::SnapType::Extension)
{
// A window corner is a free point, so neither the
// Polar increment nor the Ortho lock may pull the
// OTRACK alignment onto an axis (#291).
let step = if self.polar_mode && !is_window_corner {
Some(self.polar_increment_deg)
} else {
None
};
let (_, (ucs_x, ucs_y, _)) = self.drafting_grid_basis(i);
self.snapper.otrack_snap(
cursor_world, cursor_world,
self.tabs[i].snap_result,
self.last_point,
!is_window_corner,
view_rot, view_rot,
eye, eye,
bounds, bounds,
step,
self.last_point,
self.ortho_mode && !is_window_corner,
ucs_x.as_dvec3(),
ucs_y.as_dvec3(),
) )
} else { } else {
None None
}
}; };
self.otrack_active = otrack_hit.map(|h| (h.base, h.dir)); self.otrack_active = otrack_hit.map(|h| (h.base, h.dir));
self.otrack_kind = otrack_hit.map(|h| h.kind); self.otrack_kind = otrack_hit.map(|h| h.kind);
@ -1595,7 +1620,10 @@ impl OpenCADStudio {
// the point onto the line through last_point parallel to the // the point onto the line through last_point parallel to the
// acquired reference, and drive the alignment guide off it. // acquired reference, and drive the alignment guide off it.
// (#277) // (#277)
if self.tabs[i].snap_result.is_none() && otrack_hit.is_none() { if axis_lock.is_none()
&& self.tabs[i].snap_result.is_none()
&& otrack_hit.is_none()
{
if let Some(par) = self.snapper.parallel_snap( if let Some(par) = self.snapper.parallel_snap(
cursor_world.as_vec3(), cursor_world.as_vec3(),
self.last_point.map(|p| p.as_vec3()), self.last_point.map(|p| p.as_vec3()),
@ -1613,9 +1641,15 @@ impl OpenCADStudio {
} }
let effective = { let effective = {
let mut pt: glam::DVec3 = if let Some(h) = otrack_hit { let mut pt: glam::DVec3 = if let (Some(dir), Some(base)) =
// Tracking alignment wins over the free cursor; (axis_lock, self.last_point)
// ortho/polar don't re-constrain it. {
let point = self.tabs[i]
.snap_result
.map(|snap| snap.world)
.unwrap_or(cursor_world);
axis_lock_apply(point, base, dir)
} else if let Some(h) = otrack_hit {
h.aligned h.aligned
} else { } else {
// Snap runs in model space (viewport camera or the // Snap runs in model space (viewport camera or the
@ -1624,47 +1658,6 @@ impl OpenCADStudio {
.snap_result .snap_result
.map(|s| s.world) .map(|s| s.world)
.unwrap_or(cursor_world); .unwrap_or(cursor_world);
// Hard axis lock (#312): Shift during a rubber-band
// pick captures the nearest polar/ortho direction
// and pins the pick to that ray — even an osnap hit
// contributes only its along-axis component.
// Only while an active command is asking for a
// POINT — Shift has other meanings during entity
// picks (TRIM/EXTEND swap) and selection.
let wants_point = self.tabs[i].active_cmd.as_ref().is_some_and(|c| {
!c.needs_entity_pick()
&& !c.needs_tangent_pick()
&& !c.is_selection_gathering()
});
if let Some(base) = self.last_point {
if self.shift_down && wants_point && !is_window_corner {
if self.axis_lock_dir.is_none() {
let ucs_xf = self.tabs[i].ucs_xform();
self.axis_lock_dir = axis_lock_capture(
cursor_world,
base,
self.polar_mode,
self.polar_increment_deg,
&ucs_xf,
self.isometric_drafting,
self.iso_plane,
self.snap_angle_deg,
);
}
} else if !self.shift_down {
self.axis_lock_dir = None;
}
} else if !self.shift_down {
self.axis_lock_dir = None;
}
if let (Some(dir), Some(base)) = (self.axis_lock_dir, self.last_point) {
pt = axis_lock_apply(pt, base, dir);
pt
} else {
// Object snap wins over ortho/polar: a snapped point
// is taken as-is so it isn't pulled onto the ortho
// axis. Grid snap is positional, not an object snap,
// so it still combines with ortho/polar. (#132)
let osnap_locked = self.tabs[i] let osnap_locked = self.tabs[i]
.snap_result .snap_result
.is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid); .is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid);
@ -1695,7 +1688,6 @@ impl OpenCADStudio {
} }
} }
pt pt
}
}; };
// Clamp to world XY only when no UCS is active; with a // Clamp to world XY only when no UCS is active; with a
// UCS the point already lies on the UCS XY plane. // UCS the point already lies on the UCS XY plane.
@ -1798,6 +1790,7 @@ impl OpenCADStudio {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}); });
if let Some(cmd) = self.tabs[i].active_cmd.as_mut() { if let Some(cmd) = self.tabs[i].active_cmd.as_mut() {
cmd.set_acquisition_hint(Some(pick.label)); cmd.set_acquisition_hint(Some(pick.label));
@ -2889,39 +2882,33 @@ impl OpenCADStudio {
if self.tabs[i].active_ucs.is_none() { if self.tabs[i].active_ucs.is_none() {
pt.z = 0.0; pt.z = 0.0;
} }
let mut world_pt_locked = false; let axis_lock = if let Some(base) = self.last_point {
// Hard axis lock (#312): the held Shift lock projects self.active_axis_lock(
// the committed point — osnap hits included — onto the i,
// locked ray, matching the preview exactly. raw,
if let (Some(dir), Some(base)) = (self.axis_lock_dir, self.last_point) { base,
!needs_entity_click && !needs_tan && !is_window_corner,
)
} else {
self.axis_lock_dir = None;
None
};
if let (Some(dir), Some(base)) = (axis_lock, self.last_point) {
pt = axis_lock_apply(pt, base, dir); pt = axis_lock_apply(pt, base, dir);
if self.tabs[i].active_ucs.is_none() { if self.tabs[i].active_ucs.is_none() {
pt.z = 0.0; pt.z = 0.0;
} }
world_pt_locked = true;
} }
// OTRACK alignment wins over ortho/polar; otherwise apply let otrack = if axis_lock.is_none() {
// ortho/polar relative to the last point. self.active_otrack_hit(
let otrack = if !world_pt_locked i,
&& (snap_hit.is_none()
|| snap_hit.is_some_and(|s| s.snap_type == crate::snap::SnapType::Extension))
{
let step = if self.polar_mode && !is_window_corner {
Some(self.polar_increment_deg)
} else {
None
};
let (_, (ucs_x, ucs_y, _)) = self.drafting_grid_basis(i);
self.snapper.otrack_snap(
raw, raw,
snap_hit,
self.last_point,
!is_window_corner,
view_rot, view_rot,
eye, eye,
bounds, bounds,
step,
self.last_point,
self.ortho_mode && !is_window_corner,
ucs_x.as_dvec3(),
ucs_y.as_dvec3(),
) )
} else { } else {
None None
@ -2931,7 +2918,7 @@ impl OpenCADStudio {
if self.tabs[i].active_ucs.is_none() { if self.tabs[i].active_ucs.is_none() {
pt.z = 0.0; pt.z = 0.0;
} }
} else if !world_pt_locked } else if axis_lock.is_none()
&& !is_window_corner && !is_window_corner
&& !snap_hit.is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid) && !snap_hit.is_some_and(|s| s.snap_type != crate::snap::SnapType::Grid)
{ {

93
src/snap.rs
View file

@ -80,12 +80,10 @@ pub struct SnapResult {
/// overlay draws a dashed guide from each base to the crossing so both /// overlay draws a dashed guide from each base to the crossing so both
/// contributing extensions stay visible. `None` otherwise. (#247, #259) /// contributing extensions stay visible. `None` otherwise. (#247, #259)
pub extension_base2: Option<Point>, pub extension_base2: Option<Point>,
/// World-space twin of `extension_base`: the acquired endpoint the guide is /// Acquired endpoint used by the Extension guide and typed distance.
/// drawn from. Typed-distance entry measures along this ray, so taking it
/// from the same decision that drew the guide keeps the two from
/// disagreeing — the guide showing while typing does nothing, or the
/// distance running off along a ray the user cannot see.
pub extension_origin: Option<glam::DVec3>, pub extension_origin: Option<glam::DVec3>,
/// Source direction paired with `extension_origin`.
pub extension_dir: Option<glam::DVec3>,
} }
/// Object-snap-tracking alignment: the cursor projected onto a ray from an /// Object-snap-tracking alignment: the cursor projected onto a ray from an
@ -280,9 +278,7 @@ impl Snapper {
self.enabled.clear(); self.enabled.clear();
} }
/// Update dwell tracking and possibly acquire a new OST point. /// Update dwell tracking from the current snap result.
/// Should be called on every ViewportMove when snap is active.
/// `snap_world` is the current snap result world point (if any).
pub fn update_otrack_dwell<W: WireSource + ?Sized>( pub fn update_otrack_dwell<W: WireSource + ?Sized>(
&mut self, &mut self,
snap: Option<SnapResult>, snap: Option<SnapResult>,
@ -292,20 +288,14 @@ impl Snapper {
bounds: iced::Rectangle, bounds: iced::Rectangle,
now: Instant, now: Instant,
) { ) {
// Temporary tracking points are acquired when OTRACK is on, OR when the // Extension uses acquired points even when OTRACK is off. (#262)
// Extension object snap is on: Extension tracks a segment's line only
// from an endpoint the user has acquired, independently of OTRACK's
// on/off state (#262).
if !self.tracking_active() { if !self.tracking_active() {
self.last_snap_world = None; self.last_snap_world = None;
self.dwell_since = None; self.dwell_since = None;
self.dwell_acquired = false; self.dwell_acquired = false;
return; return;
} }
// Only stable geometric snap points may be acquired automatically for // Acquire only stable geometric snap points for OTRACK. (#716)
// OTRACK. Continuous/contextual snaps such as Nearest, Perpendicular,
// Tangent and Extension can move along geometry and would otherwise
// create arbitrary tracking points while the cursor is hovering. (#716)
let snap_world = snap.and_then(|hit| { let snap_world = snap.and_then(|hit| {
matches!( matches!(
hit.snap_type, hit.snap_type,
@ -459,21 +449,7 @@ impl Snapper {
} }
} }
/// Project the cursor onto a tracking ray emanating from one of the /// Project the cursor onto acquired tracking rays and eligible crossings.
/// acquired tracking points, in the XY plane. Without `polar_step_deg` the
/// rays are horizontal / vertical (0° / 90°); with it, every polar
/// increment is a candidate so the user can track along POLAR angles. Each
/// acquired corner also contributes a ray along its own edge directions, so
/// pulling the cursor along a segment's extension locks to that line (#219).
///
/// When the cursor sits near the crossing of two active vectors from
/// different origins the intersection point wins, so the cursor locks onto
/// the exact crossing rather than a free point along one vector:
/// * two OTRACK vectors from different tracking points (#112), and
/// * a POLAR vector from `last_point` crossing an OTRACK vector (#111).
///
/// Returns the aligned point, the unit ray direction (pointing toward the
/// cursor side, used for typed-distance entry), and the originating point.
pub fn otrack_snap( pub fn otrack_snap(
&self, &self,
cursor_world: DVec3, cursor_world: DVec3,
@ -482,6 +458,7 @@ impl Snapper {
bounds: iced::Rectangle, bounds: iced::Rectangle,
polar_step_deg: Option<f32>, polar_step_deg: Option<f32>,
last_point: Option<DVec3>, last_point: Option<DVec3>,
required_crossing_ray: Option<(DVec3, DVec3)>,
// Ortho on: the axis from `last_point` is a hard lock. Only crossings of // Ortho on: the axis from `last_point` is a hard lock. Only crossings of
// an acquired ray with that axis lock; single tracking rays are // an acquired ray with that axis lock; single tracking rays are
// suppressed so the cursor can't leave the ortho axis. (#218) // suppressed so the cursor can't leave the ortho axis. (#218)
@ -640,6 +617,12 @@ impl Snapper {
if rays[i].group == rays[j].group { if rays[i].group == rays[j].group {
continue; continue;
} }
if required_crossing_ray.is_some_and(|(origin, dir)| {
!((rays[i].origin == origin && rays[i].dir == dir)
|| (rays[j].origin == origin && rays[j].dir == dir))
}) {
continue;
}
// Under an ortho lock only crossings that involve the ortho axis // Under an ortho lock only crossings that involve the ortho axis
// are valid — every other crossing lies off it. (#218) // are valid — every other crossing lies off it. (#218)
if ortho_lock && rays[i].group != ORTHO_GROUP && rays[j].group != ORTHO_GROUP { if ortho_lock && rays[i].group != ORTHO_GROUP && rays[j].group != ORTHO_GROUP {
@ -650,6 +633,13 @@ impl Snapper {
else { else {
continue; continue;
}; };
if required_crossing_ray.is_some_and(|(origin, dir)| {
let len2 = dir.x * dir.x + dir.y * dir.y;
let t = ((x.x - origin.x) * dir.x + (x.y - origin.y) * dir.y) / len2;
t < 0.05
}) {
continue;
}
let sd = screen_dist(x); let sd = screen_dist(x);
if sd < r && best_x.as_ref().map_or(true, |(bd, _)| sd < *bd) { if sd < r && best_x.as_ref().map_or(true, |(bd, _)| sd < *bd) {
// Report an acquired tracking ray (not an auxiliary // Report an acquired tracking ray (not an auxiliary
@ -676,6 +666,9 @@ impl Snapper {
if let Some((_, h)) = best_x { if let Some((_, h)) = best_x {
return Some(h); return Some(h);
} }
if required_crossing_ray.is_some() {
return None;
}
// With Ortho on and a base point, the axis is a hard lock: no single // With Ortho on and a base point, the axis is a hard lock: no single
// tracking ray may pull the cursor off it. Only crossings with the // tracking ray may pull the cursor off it. Only crossings with the
@ -821,6 +814,7 @@ impl Snapper {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}) })
} }
@ -952,6 +946,7 @@ impl Snapper {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}); });
best_rank = snap_tier(SnapType::Grid); best_rank = snap_tier(SnapType::Grid);
best_sub = snap_priority(SnapType::Grid); best_sub = snap_priority(SnapType::Grid);
@ -1051,6 +1046,7 @@ impl Snapper {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}); });
} }
}; };
@ -1204,11 +1200,7 @@ impl Snapper {
} }
// ── Perpendicular — foot of perpendicular from the drawing base ── // ── Perpendicular — foot of perpendicular from the drawing base ──
// A perpendicular snap requires a real drawing base. Without one // Perpendicular requires a drawing base; cursor fallback acts like Nearest. (#716)
// (for example while picking the first point of LINE) there is no
// meaningful perpendicular direction, so do not offer a candidate.
// Falling back to the cursor here would make Perpendicular behave
// like Nearest. (#716)
if self.is_on(SnapType::Perpendicular) { if self.is_on(SnapType::Perpendicular) {
if let Some(q) = self.from_point.map(|v| v.as_dvec3()) { if let Some(q) = self.from_point.map(|v| v.as_dvec3()) {
if let Some(segments) = &local_segments { if let Some(segments) = &local_segments {
@ -1663,6 +1655,7 @@ impl Snapper {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}); });
} }
} }
@ -1712,6 +1705,7 @@ impl Snapper {
extension_base: None, extension_base: None,
extension_base2: None, extension_base2: None,
extension_origin: None, extension_origin: None,
extension_dir: None,
}); });
} }
}; };
@ -1769,7 +1763,7 @@ impl Snapper {
// intersection yields none, so its guides simply don't draw. (#238, #247, #259) // intersection yields none, so its guides simply don't draw. (#238, #247, #259)
if let Some(b) = best.as_mut() { if let Some(b) = best.as_mut() {
if matches!(b.snap_type, SnapType::Extension | SnapType::Intersection) { if matches!(b.snap_type, SnapType::Extension | SnapType::Intersection) {
let (b1, b2, origin) = extension_bases_screen( let (b1, b2, ray) = extension_bases_screen(
b.world, b.world,
&self.tracking_points, &self.tracking_points,
&self.tracking_dirs, &self.tracking_dirs,
@ -1779,7 +1773,8 @@ impl Snapper {
); );
b.extension_base = b1; b.extension_base = b1;
b.extension_base2 = b2; b.extension_base2 = b2;
b.extension_origin = origin; b.extension_origin = ray.map(|(origin, _)| origin);
b.extension_dir = ray.map(|(_, dir)| dir);
} }
} }
@ -2277,12 +2272,16 @@ fn extension_bases_screen(
view_rot: Mat4, view_rot: Mat4,
eye: glam::DVec3, eye: glam::DVec3,
bounds: Rectangle, bounds: Rectangle,
) -> (Option<Point>, Option<Point>, Option<glam::DVec3>) { ) -> (
Option<Point>,
Option<Point>,
Option<(glam::DVec3, glam::DVec3)>,
) {
let snapped_screen = world_to_screen(snapped, view_rot, eye, bounds); let snapped_screen = world_to_screen(snapped, view_rot, eye, bounds);
// Collect qualifying endpoints, off-ray distance measured in screen space so // Collect qualifying endpoints, off-ray distance measured in screen space so
// the tolerance stays scale-independent at UTM coordinates (a world² test // the tolerance stays scale-independent at UTM coordinates (a world² test
// would reject the crossing base once coordinates reach ~1e7). // would reject the crossing base once coordinates reach ~1e7).
let mut found: Vec<(f32, glam::DVec3, Point)> = Vec::new(); let mut found: Vec<(f32, glam::DVec3, glam::DVec3, Point)> = Vec::new();
for (&origin, dirs) in tracking_points.iter().zip(tracking_dirs) { for (&origin, dirs) in tracking_points.iter().zip(tracking_dirs) {
for &dir in dirs { for &dir in dirs {
let len2 = dir.x * dir.x + dir.y * dir.y; let len2 = dir.x * dir.x + dir.y * dir.y;
@ -2297,7 +2296,7 @@ fn extension_bases_screen(
let off = dist2(world_to_screen(on, view_rot, eye, bounds), snapped_screen); let off = dist2(world_to_screen(on, view_rot, eye, bounds), snapped_screen);
if off <= 4.0 { if off <= 4.0 {
let base = world_to_screen(origin, view_rot, eye, bounds); let base = world_to_screen(origin, view_rot, eye, bounds);
found.push((off, origin, base)); found.push((off, origin, dir, base));
} }
} }
} }
@ -2306,7 +2305,8 @@ fn extension_bases_screen(
found.sort_by(|x, y| x.0.partial_cmp(&y.0).unwrap_or(std::cmp::Ordering::Equal)); found.sort_by(|x, y| x.0.partial_cmp(&y.0).unwrap_or(std::cmp::Ordering::Equal));
let mut bases: [Option<Point>; 2] = [None, None]; let mut bases: [Option<Point>; 2] = [None, None];
let mut origins: Vec<glam::DVec3> = Vec::new(); let mut origins: Vec<glam::DVec3> = Vec::new();
for (_, origin, base) in found { let mut directions: Vec<glam::DVec3> = Vec::new();
for (_, origin, dir, base) in found {
if origins if origins
.iter() .iter()
.any(|o| (*o - origin).length_squared() < 1e-12) .any(|o| (*o - origin).length_squared() < 1e-12)
@ -2314,6 +2314,7 @@ fn extension_bases_screen(
continue; continue;
} }
origins.push(origin); origins.push(origin);
directions.push(dir);
if bases[0].is_none() { if bases[0].is_none() {
bases[0] = Some(base); bases[0] = Some(base);
} else { } else {
@ -2323,7 +2324,11 @@ fn extension_bases_screen(
} }
// `origins` is sorted nearest-fit first, so its head is the endpoint the // `origins` is sorted nearest-fit first, so its head is the endpoint the
// primary guide is drawn from — the one a typed distance measures along. // primary guide is drawn from — the one a typed distance measures along.
(bases[0], bases[1], origins.first().copied()) (
bases[0],
bases[1],
origins.first().copied().zip(directions.first().copied()),
)
} }
// ── Projection helpers ──────────────────────────────────────────────────── // ── Projection helpers ────────────────────────────────────────────────────
@ -2567,6 +2572,7 @@ mod ext_tests {
bounds, bounds,
None, None,
Some(base), Some(base),
None,
false, false,
DVec3::X, DVec3::X,
DVec3::Y, DVec3::Y,
@ -2595,6 +2601,7 @@ mod ext_tests {
bounds, bounds,
None, None,
None, None,
None,
false, false,
DVec3::X, DVec3::X,
DVec3::Y, DVec3::Y,