6c1462932d
Phase 2 of the grip overhaul: when the cursor dwells on a selected entity's grip the overlay opens a popup menu with entity-specific options (Stretch / Add Vertex / Remove Vertex / Convert to Arc-Line / …). Picking an item dispatches `apply_grip_menu`; the default `Stretch` entry is a no-op that lets the user click the grip to start the normal drag. - `GripMenuItem` + `GripMenuAction` (full vocabulary covering stretch, add/remove vertex, convert to arc/line, reverse arrows, text-position variants, hatch parameters, tangent direction). - `Grippable` trait gains `grip_menu` + `apply_grip_menu` with trait-default `Stretch`-only impls so every existing entity gets the popup for free. - `EntityTypeOps` dispatches both methods across the same entity list as the existing grip / property machinery. - `OpenCADStudio` carries `grip_hover` (dwell tracker) + `grip_popup` (open menu). `update_grip_hover` runs from `ViewportMove`: hit-tests grips, refreshes the dwell timer, and opens the popup after 600 ms. Cursor drift past 80 px or a grip click dismisses it. - `view.rs` paints the popup as an absolute-positioned column of buttons at the grip's screen anchor; each button publishes `Message::GripMenuPick(idx)`. - `LwPolyline` overrides `Grippable` manually (skips the standard macro) so its vertex grip exposes Add/Remove Vertex and its segment-midpoint grip exposes Add Vertex + Convert to Arc/Line. `apply_grip_menu` performs the edits: vertex insertion at the chord midpoint inheriting the previous bulge, vertex removal, and bulge toggle for the arc/line conversion.
638 lines
22 KiB
Rust
638 lines
22 KiB
Rust
use acadrust::entities::{LwPolyline, LwVertex};
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use glam::Vec3;
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use truck_modeling::{builder, Edge, Point3, Wire};
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use crate::command::EntityTransform;
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use crate::entities::common::{
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edit_prop as edit, parse_f64, rectangle_grip, ro_prop as ro, square_grip,
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};
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use crate::entities::traits::{TruckConvertible};
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use crate::scene::acad_to_truck::{TruckEntity, TruckObject};
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use crate::scene::object::{GripApply, GripDef, PropSection};
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use crate::scene::wire_model::TangentGeom;
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const TAU: f64 = std::f64::consts::TAU;
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/// Midpoint position on an arc segment defined by its bulge.
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fn arc_midpoint(p0: [f64; 2], p1: [f64; 2], bulge: f64) -> [f64; 2] {
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match crate::entities::common::BulgeArc::from_bulge(p0, p1, bulge) {
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Some(arc) => arc.sample(0.5),
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None => [(p0[0] + p1[0]) * 0.5, (p0[1] + p1[1]) * 0.5],
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}
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}
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/// Compute the DXF bulge for an arc that passes through p0, mid_pt, and p1.
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/// Returns None when the three points are collinear (straight segment).
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fn bulge_from_midpoint(p0: [f64; 2], p1: [f64; 2], mid: [f64; 2]) -> Option<f64> {
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// Circumcircle of (p0, mid, p1)
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let ax = 2.0 * (mid[0] - p0[0]);
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let ay = 2.0 * (mid[1] - p0[1]);
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let bx = 2.0 * (p1[0] - p0[0]);
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let by = 2.0 * (p1[1] - p0[1]);
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let ca = mid[0] * mid[0] + mid[1] * mid[1] - p0[0] * p0[0] - p0[1] * p0[1];
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let cb = p1[0] * p1[0] + p1[1] * p1[1] - p0[0] * p0[0] - p0[1] * p0[1];
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let det = ax * by - ay * bx;
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if det.abs() < 1e-12 {
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return None; // collinear
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}
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let cx = (ca * by - cb * ay) / det;
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let cy = (ax * cb - bx * ca) / det;
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let a0 = (p0[1] - cy).atan2(p0[0] - cx);
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let a1 = (p1[1] - cy).atan2(p1[0] - cx);
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// Determine arc direction: cross product (p1-p0) × (mid-p0)
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let cross = (p1[0] - p0[0]) * (mid[1] - p0[1]) - (p1[1] - p0[1]) * (mid[0] - p0[0]);
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let (sa, mut ea) = if cross > 0.0 { (a0, a1) } else { (a1, a0) };
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if ea < sa {
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ea += TAU;
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}
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let span = ea - sa; // central angle in (0, TAU]
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let bulge = (span / 4.0).tan();
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Some(if cross >= 0.0 { bulge } else { -bulge })
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}
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/// Tessellate a thick polyline segment list into NaN-separated Lines geometry.
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/// Shared by LwPolyline and Polyline2D thickness paths.
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fn thick_segments(
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seg_data: &[(f64, f64, f64, f64)], // (x0, y0, x1, y1) per seg — or use run of (x,y,bulge)
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path_pts: &[[f64; 3]],
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thickness: f64,
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normal: (f64, f64, f64),
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key_verts: Vec<[f64; 3]>,
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tangents: Vec<TangentGeom>,
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) -> TruckEntity {
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let (nx, ny, nz) = normal;
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let t = thickness;
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let off = |p: [f64; 3]| -> [f64; 3] {
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[p[0] + t * nx, p[1] + t * ny, p[2] + t * nz]
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};
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let mut pts: Vec<[f64; 3]> = Vec::with_capacity(path_pts.len() * 2 + seg_data.len() * 3 + 4);
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// Bottom path
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pts.extend_from_slice(path_pts);
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pts.push([f64::NAN; 3]);
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// Top path
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for &p in path_pts {
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pts.push(off(p));
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}
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// Walls at each vertex (seg_data.0/.1 = start x/y of each seg, last seg appends its end too)
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if !seg_data.is_empty() {
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pts.push([f64::NAN; 3]);
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for (k, &(x0, y0, _x1, _y1)) in seg_data.iter().enumerate() {
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let pb = key_verts[k];
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let _ = (x0, y0); // key_verts already has correct WCS
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pts.push(pb);
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pts.push(off(pb));
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if k + 1 < seg_data.len() {
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pts.push([f64::NAN; 3]);
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}
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}
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// Last wall at the final vertex
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if let Some(&last) = key_verts.last() {
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pts.push([f64::NAN; 3]);
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pts.push(last);
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pts.push(off(last));
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}
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}
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TruckEntity {
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object: TruckObject::Lines(pts),
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snap_pts: vec![],
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tangent_geoms: tangents,
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key_vertices: key_verts,
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fill_tris: vec![],
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}
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}
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fn to_truck(pline: &LwPolyline) -> TruckEntity {
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let verts = &pline.vertices;
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if verts.is_empty() {
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return TruckEntity {
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object: TruckObject::Point(builder::vertex(Point3::new(0.0, 0.0, 0.0))),
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snap_pts: vec![],
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tangent_geoms: vec![],
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key_vertices: vec![],
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fill_tris: vec![],
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};
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}
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let elev = pline.elevation;
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let normal = (pline.normal.x, pline.normal.y, pline.normal.z);
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let count = verts.len();
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let seg_count = if pline.is_closed { count } else { count - 1 };
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let mut edges: Vec<Edge> = Vec::new();
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let mut tangents: Vec<TangentGeom> = Vec::new();
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let mut key_verts: Vec<[f64; 3]> = Vec::new();
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// Convert OCS (x, y, elevation) to WCS Point3.
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let to_wcs = |x: f64, y: f64| -> (f64, f64, f64) {
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crate::scene::transform::ocs_point_to_wcs((x, y, elev), normal)
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};
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let to_pt = |v: &LwVertex| -> Point3 {
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let (wx, wy, wz) = to_wcs(v.location.x, v.location.y);
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Point3::new(wx, wy, wz)
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};
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if pline.thickness.abs() > 1e-10 {
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let mut path: Vec<[f64; 3]> = Vec::new();
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let mut kv: Vec<[f64; 3]> = Vec::new();
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let mut tgs: Vec<TangentGeom> = Vec::new();
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let mut seg_data: Vec<(f64, f64, f64, f64)> = Vec::new();
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// First vertex
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let (w0x, w0y, w0z) = to_wcs(verts[0].location.x, verts[0].location.y);
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path.push([w0x, w0y, w0z]);
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kv.push([w0x, w0y, w0z]);
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for i in 0..seg_count {
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let va = &verts[i];
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let vb = &verts[(i + 1) % count];
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let (ox0, oy0) = (va.location.x, va.location.y);
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let (ox1, oy1) = (vb.location.x, vb.location.y);
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let bulge = va.bulge;
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if bulge.abs() < 1e-9 {
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let (wx, wy, wz) = to_wcs(ox1, oy1);
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path.push([wx, wy, wz]);
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let p1_pt = path[path.len() - 2];
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let p2_pt = *path.last().unwrap();
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tgs.push(TangentGeom::Line {
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p1: [p1_pt[0] as f32, p1_pt[1] as f32, p1_pt[2] as f32],
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p2: [p2_pt[0] as f32, p2_pt[1] as f32, p2_pt[2] as f32],
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});
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} else if let Some(arc) =
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crate::entities::common::BulgeArc::from_bulge([ox0, oy0], [ox1, oy1], bulge)
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{
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let (wcx, wcy, wcz) = to_wcs(arc.center[0], arc.center[1]);
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tgs.push(TangentGeom::Circle {
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center: [wcx as f32, wcy as f32, wcz as f32],
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radius: arc.radius as f32,
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});
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for j in 1..=16usize {
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let s = arc.sample(j as f64 / 16.0);
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let (wx, wy, wz) = to_wcs(s[0], s[1]);
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path.push([wx, wy, wz]);
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}
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}
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let (wbx, wby, wbz) = to_wcs(ox1, oy1);
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kv.push([wbx, wby, wbz]);
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seg_data.push((ox0, oy0, ox1, oy1));
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}
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return thick_segments(&seg_data, &path, pline.thickness, normal, kv, tgs);
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}
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// plinegen=false: NaN-separated segments so the linetype pattern restarts per vertex.
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if !pline.plinegen {
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let mut pts: Vec<[f64; 3]> = Vec::new();
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let mut tgs: Vec<TangentGeom> = Vec::new();
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let mut kv: Vec<[f64; 3]> = Vec::new();
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let to_f32 = |p: [f64; 3]| -> [f32; 3] { [p[0] as f32, p[1] as f32, p[2] as f32] };
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for i in 0..seg_count {
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let va = &verts[i];
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let vb = &verts[(i + 1) % count];
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let (ox0, oy0) = (va.location.x, va.location.y);
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let (ox1, oy1) = (vb.location.x, vb.location.y);
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let bulge = va.bulge;
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let (wx0, wy0, wz0) = to_wcs(ox0, oy0);
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let p_start = [wx0, wy0, wz0];
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pts.push(p_start);
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if i == 0 {
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kv.push(p_start);
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}
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if bulge.abs() < 1e-9 {
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let (wx1, wy1, wz1) = to_wcs(ox1, oy1);
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let p_end = [wx1, wy1, wz1];
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pts.push(p_end);
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kv.push(p_end);
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tgs.push(TangentGeom::Line {
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p1: to_f32(p_start),
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p2: to_f32(p_end),
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});
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} else if let Some(arc) =
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crate::entities::common::BulgeArc::from_bulge([ox0, oy0], [ox1, oy1], bulge)
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{
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for j in 1..=16usize {
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let s = arc.sample(j as f64 / 16.0);
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let (wx, wy, wz) = to_wcs(s[0], s[1]);
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pts.push([wx, wy, wz]);
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}
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let (wx1, wy1, wz1) = to_wcs(ox1, oy1);
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kv.push([wx1, wy1, wz1]);
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let (wcx, wcy, wcz) = to_wcs(arc.center[0], arc.center[1]);
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tgs.push(TangentGeom::Circle {
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center: [wcx as f32, wcy as f32, wcz as f32],
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radius: arc.radius as f32,
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});
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}
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if i + 1 < seg_count {
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pts.push([f64::NAN; 3]);
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}
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}
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return TruckEntity {
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object: TruckObject::SegmentedLines(pts),
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snap_pts: vec![],
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tangent_geoms: tgs,
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key_vertices: kv,
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fill_tris: vec![],
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};
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}
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for i in 0..seg_count {
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let v0 = &verts[i];
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let v1 = &verts[(i + 1) % count];
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let p0 = to_pt(v0);
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let p1 = to_pt(v1);
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let bulge = v0.bulge;
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if bulge.abs() < 1e-9 {
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let tv0 = builder::vertex(p0);
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let tv1 = builder::vertex(p1);
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edges.push(builder::line(&tv0, &tv1));
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tangents.push(TangentGeom::Line {
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p1: [p0.x as f32, p0.y as f32, p0.z as f32],
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p2: [p1.x as f32, p1.y as f32, p1.z as f32],
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});
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} else if let Some(arc) = crate::entities::common::BulgeArc::from_bulge(
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[v0.location.x, v0.location.y],
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[v1.location.x, v1.location.y],
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bulge as f64,
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) {
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let mid_s = arc.sample(0.5);
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let (mid_wx, mid_wy, mid_wz) = to_wcs(mid_s[0], mid_s[1]);
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let p_mid = Point3::new(mid_wx, mid_wy, mid_wz);
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let tv0 = builder::vertex(p0);
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let tv1 = builder::vertex(p1);
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edges.push(builder::circle_arc(&tv0, &tv1, p_mid));
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let (wcx, wcy, wcz) = to_wcs(arc.center[0], arc.center[1]);
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tangents.push(TangentGeom::Circle {
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center: [wcx as f32, wcy as f32, wcz as f32],
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radius: arc.radius as f32,
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});
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}
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if i == 0 {
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key_verts.push([p0.x, p0.y, p0.z]);
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}
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key_verts.push([p1.x, p1.y, p1.z]);
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}
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TruckEntity {
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object: TruckObject::Contour(edges.into_iter().collect::<Wire>()),
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snap_pts: vec![],
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tangent_geoms: tangents,
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key_vertices: key_verts,
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fill_tris: vec![],
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}
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}
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fn grips(pline: &LwPolyline) -> Vec<GripDef> {
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let elev = pline.elevation as f32;
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let n = pline.vertices.len();
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let seg_count = if pline.is_closed {
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n
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} else {
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n.saturating_sub(1)
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};
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let mut out: Vec<GripDef> = pline
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.vertices
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.iter()
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.enumerate()
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.map(|(i, v)| square_grip(i, Vec3::new(v.location.x as f32, v.location.y as f32, elev)))
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.collect();
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// One mid-segment stretch grip per segment (straight or arc). The
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// marker is a small box rotated along the chord direction so the
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// shape itself signals which way the segment runs.
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for i in 0..seg_count {
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let v0 = &pline.vertices[i];
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let v1 = &pline.vertices[(i + 1) % n];
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let (mx, my) = if v0.bulge.abs() < 1e-9 {
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(
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(v0.location.x + v1.location.x) * 0.5,
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(v0.location.y + v1.location.y) * 0.5,
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)
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} else {
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let m = arc_midpoint(
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[v0.location.x, v0.location.y],
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[v1.location.x, v1.location.y],
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v0.bulge,
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);
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(m[0], m[1])
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};
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let dx = (v1.location.x - v0.location.x) as f32;
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let dy = (v1.location.y - v0.location.y) as f32;
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out.push(rectangle_grip(
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n + i,
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Vec3::new(mx as f32, my as f32, elev),
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[dx, dy],
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));
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}
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out
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}
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fn properties(pline: &LwPolyline) -> PropSection {
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PropSection {
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title: "Geometry".into(),
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props: vec![
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ro("Vertices", "vertices", pline.vertices.len().to_string()),
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ro(
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"Closed",
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"closed",
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if pline.is_closed { "Yes" } else { "No" },
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),
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edit("Elevation", "elevation", pline.elevation),
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],
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}
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}
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fn apply_geom_prop(pline: &mut LwPolyline, field: &str, value: &str) {
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let Some(v) = parse_f64(value) else {
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return;
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};
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if field == "elevation" {
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pline.elevation = v;
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}
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}
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fn apply_grip(pline: &mut LwPolyline, grip_id: usize, apply: GripApply) {
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let n = pline.vertices.len();
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if grip_id < n {
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// Vertex position grip
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let v = &mut pline.vertices[grip_id];
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match apply {
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GripApply::Absolute(p) => {
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v.location.x = p.x as f64;
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v.location.y = p.y as f64;
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}
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GripApply::Translate(d) => {
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v.location.x += d.x as f64;
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v.location.y += d.y as f64;
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}
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}
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} else {
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// Mid-segment stretch grip for segment (grip_id - n).
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// Straight segments translate both endpoints by the drag delta
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// (the shared vertices then carry along whichever adjacent
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// segments share them). Arc segments adjust their bulge from
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// the new midpoint position.
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let seg = grip_id - n;
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let count = if pline.is_closed {
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n
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} else {
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n.saturating_sub(1)
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};
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if seg >= count {
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return;
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}
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let i0 = seg;
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let i1 = (seg + 1) % n;
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let is_arc = pline.vertices[i0].bulge.abs() >= 1e-9;
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if !is_arc {
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let d = match apply {
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GripApply::Translate(d) => [d.x as f64, d.y as f64],
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GripApply::Absolute(p) => {
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let old_mid = (
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(pline.vertices[i0].location.x + pline.vertices[i1].location.x) * 0.5,
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(pline.vertices[i0].location.y + pline.vertices[i1].location.y) * 0.5,
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);
|
||
[p.x as f64 - old_mid.0, p.y as f64 - old_mid.1]
|
||
}
|
||
};
|
||
pline.vertices[i0].location.x += d[0];
|
||
pline.vertices[i0].location.y += d[1];
|
||
pline.vertices[i1].location.x += d[0];
|
||
pline.vertices[i1].location.y += d[1];
|
||
return;
|
||
}
|
||
let new_mid: [f64; 2] = match apply {
|
||
GripApply::Absolute(p) => [p.x as f64, p.y as f64],
|
||
GripApply::Translate(d) => {
|
||
let v0 = &pline.vertices[i0];
|
||
let v1 = &pline.vertices[i1];
|
||
let old = arc_midpoint(
|
||
[v0.location.x, v0.location.y],
|
||
[v1.location.x, v1.location.y],
|
||
v0.bulge,
|
||
);
|
||
[old[0] + d.x as f64, old[1] + d.y as f64]
|
||
}
|
||
};
|
||
let p0 = [
|
||
pline.vertices[i0].location.x,
|
||
pline.vertices[i0].location.y,
|
||
];
|
||
let p1 = [
|
||
pline.vertices[i1].location.x,
|
||
pline.vertices[i1].location.y,
|
||
];
|
||
if let Some(new_bulge) = bulge_from_midpoint(p0, p1, new_mid) {
|
||
pline.vertices[i0].bulge = new_bulge.clamp(-1e6, 1e6);
|
||
}
|
||
}
|
||
}
|
||
|
||
fn apply_transform(pline: &mut LwPolyline, t: &EntityTransform) {
|
||
crate::scene::transform::apply_standard_entity_transform(pline, t, |entity, p1, p2| {
|
||
for v in &mut entity.vertices {
|
||
crate::scene::transform::reflect_xy_point(&mut v.location.x, &mut v.location.y, p1, p2);
|
||
}
|
||
});
|
||
}
|
||
|
||
impl TruckConvertible for LwPolyline {
|
||
fn to_truck(&self, _document: &acadrust::CadDocument) -> Option<TruckEntity> {
|
||
Some(to_truck(self))
|
||
}
|
||
}
|
||
|
||
impl crate::entities::traits::Grippable for LwPolyline {
|
||
fn grips(&self) -> Vec<crate::scene::object::GripDef> {
|
||
grips(self)
|
||
}
|
||
fn apply_grip(
|
||
&mut self,
|
||
grip_id: usize,
|
||
apply: crate::scene::object::GripApply,
|
||
) {
|
||
apply_grip(self, grip_id, apply);
|
||
}
|
||
fn grip_menu(
|
||
&self,
|
||
grip_id: usize,
|
||
) -> Vec<crate::scene::object::GripMenuItem> {
|
||
use crate::scene::object::{GripMenuAction, GripMenuItem};
|
||
let n = self.vertices.len();
|
||
if grip_id < n {
|
||
// Vertex grip.
|
||
return vec![
|
||
GripMenuItem { label: "Stretch", action: GripMenuAction::Stretch },
|
||
GripMenuItem { label: "Add Vertex", action: GripMenuAction::AddVertex },
|
||
GripMenuItem { label: "Remove Vertex", action: GripMenuAction::RemoveVertex },
|
||
];
|
||
}
|
||
// Segment midpoint grip.
|
||
let seg = grip_id - n;
|
||
let is_arc = self
|
||
.vertices
|
||
.get(seg)
|
||
.map_or(false, |v| v.bulge.abs() >= 1e-9);
|
||
let convert = if is_arc {
|
||
GripMenuItem { label: "Convert to Line", action: GripMenuAction::ConvertToLine }
|
||
} else {
|
||
GripMenuItem { label: "Convert to Arc", action: GripMenuAction::ConvertToArc }
|
||
};
|
||
vec![
|
||
GripMenuItem { label: "Stretch", action: GripMenuAction::Stretch },
|
||
GripMenuItem { label: "Add Vertex", action: GripMenuAction::AddVertex },
|
||
convert,
|
||
]
|
||
}
|
||
fn apply_grip_menu(
|
||
&mut self,
|
||
grip_id: usize,
|
||
action: crate::scene::object::GripMenuAction,
|
||
) {
|
||
use crate::scene::object::GripMenuAction as A;
|
||
let n = self.vertices.len();
|
||
match action {
|
||
A::Stretch => {}
|
||
A::AddVertex => {
|
||
// Insert a new vertex at the chord midpoint between the
|
||
// hovered vertex (or segment) and its neighbour. The new
|
||
// vertex inherits the previous vertex's bulge so an
|
||
// existing arc is split into two arcs of the same chord.
|
||
let (i0, i1) = if grip_id < n {
|
||
let i0 = grip_id;
|
||
let i1 = (grip_id + 1) % n;
|
||
(i0, i1)
|
||
} else {
|
||
let seg = grip_id - n;
|
||
(seg, (seg + 1) % n)
|
||
};
|
||
if i1 == 0 && !self.is_closed {
|
||
return;
|
||
}
|
||
let v0 = &self.vertices[i0];
|
||
let v1 = &self.vertices[i1];
|
||
let mx = (v0.location.x + v1.location.x) * 0.5;
|
||
let my = (v0.location.y + v1.location.y) * 0.5;
|
||
let inherited = v0.clone();
|
||
let mut new_v = inherited.clone();
|
||
new_v.location.x = mx;
|
||
new_v.location.y = my;
|
||
let insert_at = (i0 + 1).min(self.vertices.len());
|
||
self.vertices.insert(insert_at, new_v);
|
||
}
|
||
A::RemoveVertex if grip_id < n && self.vertices.len() > 2 => {
|
||
self.vertices.remove(grip_id);
|
||
}
|
||
A::ConvertToArc if grip_id >= n => {
|
||
if let Some(v) = self.vertices.get_mut(grip_id - n) {
|
||
if v.bulge.abs() < 1e-9 {
|
||
v.bulge = 0.5;
|
||
}
|
||
}
|
||
}
|
||
A::ConvertToLine if grip_id >= n => {
|
||
if let Some(v) = self.vertices.get_mut(grip_id - n) {
|
||
v.bulge = 0.0;
|
||
}
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
}
|
||
|
||
impl crate::entities::traits::PropertyEditable for LwPolyline {
|
||
fn geometry_properties(
|
||
&self,
|
||
_text_style_names: &[String],
|
||
) -> crate::scene::object::PropSection {
|
||
properties(self)
|
||
}
|
||
fn apply_geom_prop(&mut self, field: &str, value: &str) {
|
||
apply_geom_prop(self, field, value);
|
||
}
|
||
}
|
||
|
||
impl crate::entities::traits::Transformable for LwPolyline {
|
||
fn apply_transform(&mut self, t: &crate::command::EntityTransform) {
|
||
apply_transform(self, t);
|
||
}
|
||
}
|
||
|
||
pub(crate) fn wide_fills(pl: &acadrust::entities::LwPolyline) -> Vec<Vec<[f32; 2]>> {
|
||
let hw_const = (pl.constant_width / 2.0) as f32;
|
||
let verts = &pl.vertices;
|
||
let n = verts.len();
|
||
if n < 2 {
|
||
return vec![];
|
||
}
|
||
let seg_count = if pl.is_closed { n } else { n - 1 };
|
||
let mut out = Vec::new();
|
||
for i in 0..seg_count {
|
||
let v0 = &verts[i];
|
||
let v1 = &verts[(i + 1) % n];
|
||
let hw0 = if v0.start_width > 1e-9 {
|
||
v0.start_width as f32 / 2.0
|
||
} else {
|
||
hw_const
|
||
};
|
||
let hw1 = if v0.end_width > 1e-9 {
|
||
v0.end_width as f32 / 2.0
|
||
} else {
|
||
hw_const
|
||
};
|
||
if hw0 < 1e-6 && hw1 < 1e-6 {
|
||
continue;
|
||
}
|
||
let p0 = [v0.location.x as f32, v0.location.y as f32];
|
||
let p1 = [v1.location.x as f32, v1.location.y as f32];
|
||
if let Some(poly) = crate::entities::common::polyline_segment_fill(p0, p1, hw0, hw1, v0.bulge as f32) {
|
||
out.push(poly);
|
||
}
|
||
}
|
||
out
|
||
}
|
||
|
||
impl crate::entities::traits::MassPropsCalc for acadrust::entities::LwPolyline {
|
||
fn mass_props(&self) -> crate::entities::traits::MassProps {
|
||
let p = self;
|
||
let n = p.vertices.len();
|
||
if n < 2 {
|
||
return crate::entities::traits::MassProps {
|
||
area: 0.0,
|
||
perimeter: 0.0,
|
||
cx: 0.0,
|
||
cy: 0.0,
|
||
};
|
||
}
|
||
// Shoelace area + perimeter
|
||
let mut area_sum = 0.0f64;
|
||
let mut perimeter = 0.0f64;
|
||
let mut cx_sum = 0.0f64;
|
||
let mut cy_sum = 0.0f64;
|
||
let n_segs = if p.is_closed { n } else { n - 1 };
|
||
for idx in 0..n_segs {
|
||
let v0 = &p.vertices[idx];
|
||
let v1 = &p.vertices[(idx + 1) % n];
|
||
let x0 = v0.location.x;
|
||
let y0 = v0.location.y;
|
||
let x1 = v1.location.x;
|
||
let y1 = v1.location.y;
|
||
area_sum += x0 * y1 - x1 * y0;
|
||
perimeter += ((x1 - x0).powi(2) + (y1 - y0).powi(2)).sqrt();
|
||
cx_sum += (x0 + x1) * (x0 * y1 - x1 * y0);
|
||
cy_sum += (y0 + y1) * (x0 * y1 - x1 * y0);
|
||
}
|
||
let area = (area_sum / 2.0).abs();
|
||
let (cx, cy) = if area > 1e-12 {
|
||
(cx_sum / (6.0 * area), cy_sum / (6.0 * area))
|
||
} else {
|
||
let sx: f64 = p.vertices.iter().map(|v| v.location.x).sum::<f64>() / n as f64;
|
||
let sy: f64 = p.vertices.iter().map(|v| v.location.y).sum::<f64>() / n as f64;
|
||
(sx, sy)
|
||
};
|
||
crate::entities::traits::MassProps {
|
||
area,
|
||
perimeter,
|
||
cx,
|
||
cy,
|
||
}
|
||
}
|
||
}
|