forked from 1b-agent/opencadstudio-upstream
Hakan Seven
b8889ccd20
Support polygonal and object viewports through native clip-boundary handles, including clipped rendering and selection. Closes #525
741 lines
30 KiB
Rust
741 lines
30 KiB
Rust
// Auto-split from scene/mod.rs. Pure text-move; behaviour unchanged.
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use super::*;
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impl Scene {
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/// Collect model-space wires projected into paper space for all (or one specific)
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/// user viewports. `only_vp = Some(h)` restricts output to that viewport.
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pub(super) fn viewport_content_wires(
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&self,
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paper_block: Handle,
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only_vp: Option<Handle>,
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exclude_vp: Option<Handle>,
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) -> Vec<WireModel> {
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use acadrust::entities::Viewport;
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let (_, _, viewport_handles) = self.paper_viewport_handles();
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let viewports: Vec<&Viewport> = viewport_handles
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.iter()
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.filter_map(|handle| match self.document.get_entity(*handle) {
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Some(EntityType::Viewport(vp)) => Some(vp),
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_ => None,
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})
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.filter(|vp| {
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vp.common.owner_handle == paper_block
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&& vp.status.is_on
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&& only_vp.map_or(true, |h| vp.common.handle == h)
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&& exclude_vp.map_or(true, |h| vp.common.handle != h)
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})
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.collect();
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if viewports.is_empty() {
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return vec![];
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}
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let mut result = Vec::new();
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for vp in viewports {
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let vp_handle = vp.common.handle;
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// ── Fast path: return cached projected wires ──────────────────
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{
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let cache = self.paper_projected_cache.borrow();
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if let Some((cached_epoch, ref wires)) = cache.get(&vp_handle) {
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if *cached_epoch == self.geometry_epoch {
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result.extend_from_slice(wires);
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continue;
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}
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}
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}
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// ── Cache miss: compute projection ────────────────────────────
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// Use camera_for_viewport so the axes match the GPU renderer exactly.
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let cam_frame = match self.camera_for_viewport(vp_handle) {
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Some(c) => c,
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None => continue,
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};
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let view_right = cam_frame.rotation * glam::Vec3::X;
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let view_up = cam_frame.rotation * glam::Vec3::Y;
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// Scale (paper units per model unit) comes straight from the camera
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// the GPU uses: the model height shown is `2 * ortho_size`, mapped
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// onto `vp.height` of paper. `camera_for_viewport` already made the
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// saved-view-vs-auto-fit decision (with the twist-correct overlap
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// test), so deriving scale from it keeps the CPU projection (used
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// for hit-test / snap / fit) locked to the GPU render — no second,
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// independently-computed scale that could disagree under a twist.
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let view_height_eff = (cam_frame.ortho_size() * 2.0) as f64;
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let scale = if view_height_eff > 1e-9 {
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(vp.height / view_height_eff) as f32
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} else {
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1.0
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};
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let pcx = vp.center.x as f32;
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let pcy = vp.center.y as f32;
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let pcz = vp.center.z as f32;
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let hw = (vp.width / 2.0) as f32;
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let hh = (vp.height / 2.0) as f32;
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// ── Use cached tessellation (model_wires_for_viewport_arc) ────
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// This eliminates the per-frame tessellate_one() loop that was here
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// previously; tessellation is now O(1) on navigation frames.
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// Pass 0.0 for screen height — the CPU-projection / hit-test
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// path wants the full-fidelity (no-LOD-stub) wire list,
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// regardless of paper zoom.
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let model_wires = self.model_wires_for_viewport_arc(vp_handle, 0.0);
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// ── Project and clip wires into viewport ──────────────────────
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let vp_x0 = pcx - hw;
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let vp_x1 = pcx + hw;
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let vp_y0 = pcy - hh;
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let vp_y1 = pcy + hh;
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// camera_dist: how far the camera is from the target plane.
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let use_perspective = vp.status.perspective && vp.lens_length > 1.0;
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let camera_dist = if use_perspective {
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(vp.view_height as f32 * vp.lens_length as f32 / 24.0).max(0.001)
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} else {
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0.0
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};
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let mut projected: Vec<WireModel> = Vec::new();
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// Precompute precision-stable WCS-space projection inputs in
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// f64. The previous f32 inner loop suffered catastrophic
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// cancellation on UTM-scale drawings: `(wire_offset_rel -
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// target_offset_rel).dot(view_right) - view_center` is a
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// small paper offset computed by subtracting two values at
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// ~5e6 magnitude — f32 ULP there is ~0.5 m, so paper output
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// jittered by cm even when the actual model was clean.
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//
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// Do everything WCS-relative in f64; cast to f32 only at the
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// final paper position.
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// Display centre = the camera's target, in WCS. `camera_for_viewport`
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// already folded view_center through the (twisted) view basis and
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// applied the empty-WCS auto-fit, so taking its target keeps the CPU
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// projection identical to the GPU renderer under any twist.
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let display_center_x = cam_frame.target.x as f64 + [0.0_f64; 3][0];
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let display_center_y = cam_frame.target.y as f64 + [0.0_f64; 3][1];
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let display_center_z = cam_frame.target.z as f64 + [0.0_f64; 3][2];
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let view_right_d = (
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view_right.x as f64,
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view_right.y as f64,
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view_right.z as f64,
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);
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let view_up_d = (view_up.x as f64, view_up.y as f64, view_up.z as f64);
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let view_fwd = cam_frame.rotation * glam::Vec3::Z;
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let view_fwd_d = (view_fwd.x as f64, view_fwd.y as f64, view_fwd.z as f64);
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let camera_dist_d = camera_dist as f64;
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let scale_d = scale as f64;
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let pcx_d = pcx as f64;
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let pcy_d = pcy as f64;
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// Project one ABSOLUTE-WCS model point (f64) onto the paper sheet.
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// Shared by the polyline points, snap points and key vertices so the
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// hit-test / snap geometry lands in the same paper frame the wire is
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// drawn in — otherwise snaps and the click-AABB stay in model (UTM)
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// space and the cursor never reaches them.
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let proj_abs = |ax: f64, ay: f64, az: f64| -> [f32; 3] {
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let mp_x = ax - display_center_x;
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let mp_y = ay - display_center_y;
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let mp_z = az - display_center_z;
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let u = mp_x * view_right_d.0 + mp_y * view_right_d.1 + mp_z * view_right_d.2;
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let v = mp_x * view_up_d.0 + mp_y * view_up_d.1 + mp_z * view_up_d.2;
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if use_perspective {
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let d_vd = mp_x * view_fwd_d.0 + mp_y * view_fwd_d.1 + mp_z * view_fwd_d.2;
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let fwd = camera_dist_d - d_vd;
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if fwd <= 0.001 {
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return [f32::NAN; 3];
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}
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let factor = camera_dist_d / fwd;
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[
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(pcx_d + u * factor * scale_d) as f32,
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(pcy_d + v * factor * scale_d) as f32,
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pcz,
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]
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} else {
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[(pcx_d + u * scale_d) as f32, (pcy_d + v * scale_d) as f32, pcz]
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}
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};
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let in_vp = |x: f32, y: f32| x >= vp_x0 && x <= vp_x1 && y >= vp_y0 && y <= vp_y1;
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for wire in model_wires.iter() {
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let projected_pts: Vec<[f32; 3]> = wire
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.points
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.iter()
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.enumerate()
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.map(|(pi, &[mx, my, mz])| {
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if mx.is_nan() || my.is_nan() || mz.is_nan() {
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return [f32::NAN; 3];
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}
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// Reconstruct absolute WCS from the double-single high
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// (`points`) + low (`points_low`) pair — the high f32
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// alone is ~0.5 m off at UTM scale.
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let lo = wire.points_low.get(pi).copied().unwrap_or([0.0; 3]);
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proj_abs(mx as f64 + lo[0] as f64, my as f64 + lo[1] as f64, mz as f64 + lo[2] as f64)
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})
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.collect();
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// SDF glyph quads ride `text_verts` in absolute WCS, so they need
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// the same projection the points get — a bare clone leaves the
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// text at model (UTM) coordinates while its own dimension lines
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// move to the sheet, putting the glyphs kilometres off the page
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// (issue #385 for layout plots). Cull per glyph on the quad's
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// centroid: the text analogue of `clip_polyline_to_rect`, since a
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// glyph can't be split at the viewport border.
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let mut projected_text = if wire.text_verts.is_empty() {
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Vec::new()
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} else {
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model::wire_model::map_text_verts(&wire.text_verts, |x, y, z| {
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let p = proj_abs(x, y, z);
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(p[0] as f64, p[1] as f64, p[2] as f64)
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})
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.chunks_exact(6)
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.filter(|quad| {
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let (sx, sy) = quad.iter().fold((0.0f32, 0.0f32), |(ax, ay), v| {
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(ax + v.pos[0] + v.pos_low[0], ay + v.pos[1] + v.pos_low[1])
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});
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let (cx, cy) = (sx / 6.0, sy / 6.0);
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cx.is_finite() && cy.is_finite() && in_vp(cx, cy)
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})
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.flatten()
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.copied()
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.collect::<Vec<_>>()
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};
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// Fast AABB pre-reject.
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let any_near = projected_pts.iter().any(|&[x, y, _]| {
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x.is_finite()
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&& y.is_finite()
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&& x >= vp_x0 - 1.0
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&& x <= vp_x1 + 1.0
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&& y >= vp_y0 - 1.0
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&& y <= vp_y1 + 1.0
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});
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let (min_x, max_x, min_y, max_y) =
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projected_pts.iter().filter(|p| p[0].is_finite()).fold(
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(
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f32::INFINITY,
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f32::NEG_INFINITY,
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f32::INFINITY,
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f32::NEG_INFINITY,
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),
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|(mnx, mxx, mny, mxy), &[x, y, _]| {
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(mnx.min(x), mxx.max(x), mny.min(y), mxy.max(y))
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},
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);
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let aabb_hits =
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max_x >= vp_x0 && min_x <= vp_x1 && max_y >= vp_y0 && min_y <= vp_y1;
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// A text-only wire (TEXT / MTEXT carry no stroke `points` since
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// text went SDF-only) has nothing to pre-reject on, so gate both
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// rejections on the glyphs too or it never reaches the sheet.
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if !any_near && !aabb_hits && projected_text.is_empty() {
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continue;
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}
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let clipped =
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clip_polyline_to_rect(&projected_pts, vp_x0, vp_y0, vp_x1, vp_y1, pcz);
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if clipped.is_empty() && projected_text.is_empty() {
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continue;
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}
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// Paper-space AABB of the clipped polyline — the cloned model
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// (UTM) AABB would make click_hit's screen-projected pre-reject
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// discard the wire (box selection has no pre-reject, which is why
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// it kept working while picking didn't).
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let mut pmnx = f32::INFINITY;
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let mut pmny = f32::INFINITY;
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let mut pmxx = f32::NEG_INFINITY;
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let mut pmxy = f32::NEG_INFINITY;
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for &[x, y, _] in clipped.iter().filter(|p| p[0].is_finite()) {
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pmnx = pmnx.min(x);
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pmny = pmny.min(y);
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pmxx = pmxx.max(x);
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pmxy = pmxy.max(y);
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}
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// Glyphs count towards the paper AABB as well — a text-only wire
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// would otherwise stay UNBOUNDED and never pick.
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for v in &projected_text {
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let (x, y) = (v.pos[0] + v.pos_low[0], v.pos[1] + v.pos_low[1]);
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if x.is_finite() && y.is_finite() {
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pmnx = pmnx.min(x);
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pmny = pmny.min(y);
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pmxx = pmxx.max(x);
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pmxy = pmxy.max(y);
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}
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}
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// Project snap points + key vertices into the same paper frame,
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// keeping only those inside the viewport rect, so endpoint /
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// midpoint / centre snaps land on the visible sheet geometry
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// instead of the model's UTM coordinates.
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let snap_pts: Vec<(glam::DVec3, model::wire_model::SnapHint)> = wire
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.snap_pts
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.iter()
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.filter_map(|(w, h)| {
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let p = proj_abs(w.x, w.y, w.z);
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(p[0].is_finite() && in_vp(p[0], p[1]))
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.then(|| (glam::DVec3::new(p[0] as f64, p[1] as f64, p[2] as f64), *h))
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})
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.collect();
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let key_vertices: Vec<[f64; 3]> = wire
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.key_vertices
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.iter()
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.filter_map(|&[kx, ky, kz]| {
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let p = proj_abs(kx, ky, kz);
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(p[0].is_finite() && in_vp(p[0], p[1]))
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.then(|| [p[0] as f64, p[1] as f64, p[2] as f64])
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})
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.collect();
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let adapted = view::render::adapt_to_bg(wire.color, self.paper_bg_color);
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let [r, g, b, a] = adapted;
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// Glyphs carry their own per-vertex colour, so dim them through
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// the same adapt + 0.80/0.85 the wire colour below gets, or the
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// text reads brighter than its own dimension lines.
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for v in &mut projected_text {
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let [tr, tg, tb, ta] = view::render::adapt_to_bg(v.color, self.paper_bg_color);
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v.color = [tr * 0.80, tg * 0.80, tb * 0.80, ta * 0.85];
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}
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let mut out = wire.clone();
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out.points = clipped;
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out.text_verts = projected_text;
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// Paper coordinates are small sheet units — no relative-to-eye
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// residual is needed, and keeping the model wire's points_low
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// here would add a model-scale offset to the paper points.
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out.points_low = Vec::new();
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out.snap_pts = snap_pts;
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out.key_vertices = key_vertices;
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// Tangent geometry is in model space and can't be trivially
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// re-expressed in paper coords — drop it (no tangent snap on
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// projected viewport content) rather than snap to UTM.
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out.tangent_geoms = Vec::new();
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// Same for thickness walls: `points` above were projected and
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// clipped into paper coords, and the clone's wall triangles are
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// still model-space. Left in place they would hit-test at a
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// model-scale offset — a stray catch somewhere out on the sheet.
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// Drop them: an extruded entity inside a floating viewport stays
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// selectable by its edges, which do get projected.
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out.pick_tris = Vec::new();
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out.pick_tris_low = Vec::new();
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out.aabb = if pmnx.is_finite() {
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[pmnx, pmny, pmxx, pmxy]
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} else {
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WireModel::UNBOUNDED_AABB
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};
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out.color = [r * 0.80, g * 0.80, b * 0.80, a * 0.85];
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out.line_weight_px = wire.line_weight_px;
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// Wire patterns stay in their base model units. Projection
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// normally scales them with the geometry; PSLTSCALE instead
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// keeps dash sizes constant in paper units (the on-screen path
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// applies the same factor through its viewport uniform).
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let dash_scale = if self.document.header.paper_space_linetype_scaling {
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1.0
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} else {
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scale
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};
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out.pattern_length = wire.pattern_length * dash_scale;
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out.pattern = wire.pattern.map(|v| v * dash_scale);
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projected.push(out);
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}
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// Store in cache, then extend result.
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self.paper_projected_cache
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.borrow_mut()
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.insert(vp_handle, (self.geometry_epoch, projected.clone()));
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result.extend(projected);
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}
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result
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}
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/// A content viewport's clip boundary, projected into that viewport's
|
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/// render-target normalized device coords. Every content viewport goes
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/// through the same stencil path: a rectangular viewport contributes its
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/// own four corners (a full-target mask, since the render rectangle already
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/// clips the edges), a viewport with a `clip_boundary_handle` contributes
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/// that entity's tessellated outline. Returns empty only when the viewport
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/// is degenerate.
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///
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/// `uo/vo/us/vs` are the visible-sub-rect crop the content camera applies
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/// (see `crop_view_proj`); the same crop is applied here so the boundary
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/// lines up with the content even when the viewport hangs off-canvas.
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pub(super) fn viewport_clip_boundary_ndc(
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&self,
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vp_handle: Handle,
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uo: f32,
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vo: f32,
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us: f32,
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vs: f32,
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) -> Vec<[f32; 2]> {
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use acadrust::entities::Viewport;
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let Some(EntityType::Viewport(vp)) = self.document.get_entity(vp_handle) else {
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return vec![];
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};
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let vp: &Viewport = vp;
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let pcx = vp.center.x as f32;
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let pcy = vp.center.y as f32;
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let z = vp.center.z as f32;
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let hw = (vp.width / 2.0) as f32;
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let hh = (vp.height / 2.0) as f32;
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if hw.abs() < 1e-6 || hh.abs() < 1e-6 {
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return vec![];
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}
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let poly = if vp.clip_boundary_handle.is_null() {
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// Rectangular viewport → its own four corners (paper coords). These
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// map to full-rect NDC [-1, 1], a no-op mask over a render target
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// that already clips to the rectangle, but it keeps rect and
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// non-rect viewports on one uniform stencil path.
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vec![
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[pcx - hw, pcy - hh, z],
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[pcx + hw, pcy - hh, z],
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[pcx + hw, pcy + hh, z],
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[pcx - hw, pcy + hh, z],
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]
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} else {
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self.clip_boundary_polygon(vp.clip_boundary_handle, z)
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};
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if poly.len() < 3 {
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return vec![];
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}
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// Paper point → full-rectangle NDC ([-1, 1] across the viewport rect,
|
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// Y up, matching the content camera + `viewport_screen_rect`), then the
|
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// same crop the content camera uses to map its visible sub-rect back to
|
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// NDC [-1, 1].
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let us = us.max(1e-6);
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let vs = vs.max(1e-6);
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let sx = 1.0 / us;
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let sy = 1.0 / vs;
|
||
let tx = (1.0 - 2.0 * uo - us) / us;
|
||
let ty = -(1.0 - 2.0 * vo - vs) / vs;
|
||
poly.iter()
|
||
.map(|p| {
|
||
let nx = (p[0] - pcx) / hw;
|
||
let ny = (p[1] - pcy) / hh;
|
||
[sx * nx + tx, sy * ny + ty]
|
||
})
|
||
.collect()
|
||
}
|
||
|
||
/// Tessellated outline of a non-rectangular viewport / XCLIP clip-boundary
|
||
/// entity, in paper coordinates. Closed polylines are sampled directly
|
||
/// because their normal tessellation is a `Contour`, not `Lines`.
|
||
pub(crate) fn clip_boundary_polygon(&self, handle: Handle, z: f32) -> Vec<[f32; 3]> {
|
||
clip_boundary_polygon_for_document(&self.document, handle, z)
|
||
}
|
||
}
|
||
|
||
pub(crate) fn clip_boundary_polygon_for_document(
|
||
document: &CadDocument,
|
||
handle: Handle,
|
||
z: f32,
|
||
) -> Vec<[f32; 3]> {
|
||
use std::f64::consts::TAU;
|
||
let Some(entity) = document
|
||
.entities()
|
||
.find(|e| e.common().handle == handle)
|
||
else {
|
||
return vec![];
|
||
};
|
||
// Circles and ellipses tessellate directly — their `to_truck` returns a
|
||
// parametric TruckObject (not `Lines`), so extracting a polygon there
|
||
// would come back empty. Everything else (splines, polylines, …) reuses
|
||
// the entity's own `Lines` tessellation.
|
||
const N: usize = 64;
|
||
match entity {
|
||
EntityType::Circle(c) => (0..N)
|
||
.map(|i| {
|
||
let a = i as f64 * TAU / N as f64;
|
||
[
|
||
(c.center.x + a.cos() * c.radius) as f32,
|
||
(c.center.y + a.sin() * c.radius) as f32,
|
||
z,
|
||
]
|
||
})
|
||
.collect(),
|
||
EntityType::Ellipse(el) => {
|
||
// major_axis = center → major endpoint; minor = perp(major) × ratio.
|
||
let (mx, my) = (el.major_axis.x, el.major_axis.y);
|
||
let r = el.minor_axis_ratio;
|
||
(0..N)
|
||
.map(|i| {
|
||
let t = i as f64 * TAU / N as f64;
|
||
let px = mx * t.cos() - my * r * t.sin();
|
||
let py = my * t.cos() + mx * r * t.sin();
|
||
[(el.center.x + px) as f32, (el.center.y + py) as f32, z]
|
||
})
|
||
.collect()
|
||
}
|
||
EntityType::LwPolyline(polyline) if polyline.is_closed => {
|
||
let vertices: Vec<([f64; 2], f64)> = polyline
|
||
.vertices
|
||
.iter()
|
||
.map(|vertex| {
|
||
(
|
||
[vertex.location.x, vertex.location.y],
|
||
vertex.bulge,
|
||
)
|
||
})
|
||
.collect();
|
||
sample_polyline_clip_boundary(
|
||
&vertices,
|
||
polyline.elevation,
|
||
(
|
||
polyline.normal.x,
|
||
polyline.normal.y,
|
||
polyline.normal.z,
|
||
),
|
||
z,
|
||
)
|
||
}
|
||
EntityType::Polyline2D(polyline) if polyline.is_closed() => {
|
||
let vertices: Vec<([f64; 2], f64)> = polyline
|
||
.vertices
|
||
.iter()
|
||
.map(|vertex| {
|
||
(
|
||
[vertex.location.x, vertex.location.y],
|
||
vertex.bulge,
|
||
)
|
||
})
|
||
.collect();
|
||
sample_polyline_clip_boundary(
|
||
&vertices,
|
||
polyline.elevation,
|
||
(
|
||
polyline.normal.x,
|
||
polyline.normal.y,
|
||
polyline.normal.z,
|
||
),
|
||
z,
|
||
)
|
||
}
|
||
EntityType::Polyline(polyline) if polyline.is_closed() => polyline
|
||
.vertices
|
||
.iter()
|
||
.map(|vertex| {
|
||
[
|
||
vertex.location.x as f32,
|
||
vertex.location.y as f32,
|
||
z,
|
||
]
|
||
})
|
||
.collect(),
|
||
EntityType::Polyline3D(polyline) if polyline.flags.closed => polyline
|
||
.vertices
|
||
.iter()
|
||
.map(|vertex| {
|
||
[
|
||
vertex.position.x as f32,
|
||
vertex.position.y as f32,
|
||
z,
|
||
]
|
||
})
|
||
.collect(),
|
||
_ => {
|
||
use crate::entities::traits::EntityTypeOps;
|
||
let Some(te) = entity.to_truck_entity(document) else {
|
||
return vec![];
|
||
};
|
||
if let crate::scene::convert::acad_to_truck::TruckObject::Lines(pts) = te.object {
|
||
pts.into_iter()
|
||
.filter(|p| p[0].is_finite() && p[1].is_finite())
|
||
.map(|p| [p[0] as f32, p[1] as f32, z])
|
||
.collect()
|
||
} else {
|
||
vec![]
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
fn sample_polyline_clip_boundary(
|
||
vertices: &[([f64; 2], f64)],
|
||
elevation: f64,
|
||
normal: (f64, f64, f64),
|
||
z: f32,
|
||
) -> Vec<[f32; 3]> {
|
||
if vertices.len() < 3 {
|
||
return Vec::new();
|
||
}
|
||
let to_wcs = |point: [f64; 2]| {
|
||
crate::scene::view::transform::ocs_point_to_wcs(
|
||
(point[0], point[1], elevation),
|
||
normal,
|
||
)
|
||
};
|
||
let mut output = Vec::new();
|
||
let first = to_wcs(vertices[0].0);
|
||
output.push([first.0 as f32, first.1 as f32, z]);
|
||
for index in 0..vertices.len() {
|
||
let (start, bulge) = vertices[index];
|
||
let end_index = (index + 1) % vertices.len();
|
||
let end = vertices[end_index].0;
|
||
if let Some(arc) =
|
||
crate::entities::common::BulgeArc::from_bulge(start, end, bulge)
|
||
{
|
||
let steps = ((arc.sweep.abs() / std::f64::consts::TAU * 64.0).ceil()
|
||
as usize)
|
||
.clamp(4, 64);
|
||
for step in 1..=steps {
|
||
if end_index == 0 && step == steps {
|
||
break;
|
||
}
|
||
let point = to_wcs(arc.sample(step as f64 / steps as f64));
|
||
output.push([point.0 as f32, point.1 as f32, z]);
|
||
}
|
||
} else if end_index != 0 {
|
||
let point = to_wcs(end);
|
||
output.push([point.0 as f32, point.1 as f32, z]);
|
||
}
|
||
}
|
||
output
|
||
}
|
||
|
||
// ── Paper boundary wire ────────────────────────────────────────────────────
|
||
|
||
// ── Cohen-Sutherland line clipping ───────────────────────────────────────
|
||
|
||
/// Clip a single segment (x0,y0)→(x1,y1) against the axis-aligned rectangle
|
||
/// [xmin,xmax]×[ymin,ymax]. Returns the clipped endpoints or `None` if the
|
||
/// segment is entirely outside.
|
||
|
||
fn cs_clip(
|
||
mut x0: f32,
|
||
mut y0: f32,
|
||
mut x1: f32,
|
||
mut y1: f32,
|
||
xmin: f32,
|
||
ymin: f32,
|
||
xmax: f32,
|
||
ymax: f32,
|
||
) -> Option<(f32, f32, f32, f32)> {
|
||
const LEFT: u8 = 1;
|
||
const RIGHT: u8 = 2;
|
||
const BOTTOM: u8 = 4;
|
||
const TOP: u8 = 8;
|
||
|
||
let code = |x: f32, y: f32| -> u8 {
|
||
let mut c = 0u8;
|
||
if x < xmin {
|
||
c |= LEFT;
|
||
} else if x > xmax {
|
||
c |= RIGHT;
|
||
}
|
||
if y < ymin {
|
||
c |= BOTTOM;
|
||
} else if y > ymax {
|
||
c |= TOP;
|
||
}
|
||
c
|
||
};
|
||
|
||
let mut c0 = code(x0, y0);
|
||
let mut c1 = code(x1, y1);
|
||
|
||
loop {
|
||
if c0 | c1 == 0 {
|
||
return Some((x0, y0, x1, y1));
|
||
}
|
||
if c0 & c1 != 0 {
|
||
return None;
|
||
}
|
||
let cout = if c0 != 0 { c0 } else { c1 };
|
||
let (x, y);
|
||
if cout & TOP != 0 {
|
||
x = x0 + (x1 - x0) * (ymax - y0) / (y1 - y0);
|
||
y = ymax;
|
||
} else if cout & BOTTOM != 0 {
|
||
x = x0 + (x1 - x0) * (ymin - y0) / (y1 - y0);
|
||
y = ymin;
|
||
} else if cout & RIGHT != 0 {
|
||
y = y0 + (y1 - y0) * (xmax - x0) / (x1 - x0);
|
||
x = xmax;
|
||
} else {
|
||
y = y0 + (y1 - y0) * (xmin - x0) / (x1 - x0);
|
||
x = xmin;
|
||
}
|
||
if cout == c0 {
|
||
x0 = x;
|
||
y0 = y;
|
||
c0 = code(x0, y0);
|
||
} else {
|
||
x1 = x;
|
||
y1 = y;
|
||
c1 = code(x1, y1);
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Clip a projected polyline (NaN-separated segments) to the viewport rectangle.
|
||
/// Returns a new points vec with proper NaN separators at clip boundaries.
|
||
fn clip_polyline_to_rect(
|
||
pts: &[[f32; 3]],
|
||
xmin: f32,
|
||
ymin: f32,
|
||
xmax: f32,
|
||
ymax: f32,
|
||
z: f32,
|
||
) -> Vec<[f32; 3]> {
|
||
const NAN3: [f32; 3] = [f32::NAN, f32::NAN, f32::NAN];
|
||
let mut result: Vec<[f32; 3]> = Vec::new();
|
||
let mut i = 0;
|
||
|
||
while i < pts.len() {
|
||
// Skip NaN separators.
|
||
if pts[i][0].is_nan() || pts[i][1].is_nan() {
|
||
i += 1;
|
||
continue;
|
||
}
|
||
// Gather contiguous run of finite points.
|
||
let start = i;
|
||
while i < pts.len() && pts[i][0].is_finite() && pts[i][1].is_finite() {
|
||
i += 1;
|
||
}
|
||
let seg = &pts[start..i];
|
||
if seg.len() < 2 {
|
||
continue;
|
||
}
|
||
|
||
// Clip each edge and track pen state to insert NaN on lift.
|
||
let mut pen_down = false;
|
||
for j in 0..seg.len() - 1 {
|
||
let [x0, y0, _] = seg[j];
|
||
let [x1, y1, _] = seg[j + 1];
|
||
match cs_clip(x0, y0, x1, y1, xmin, ymin, xmax, ymax) {
|
||
None => {
|
||
pen_down = false;
|
||
}
|
||
Some((cx0, cy0, cx1, cy1)) => {
|
||
if !pen_down {
|
||
if !result.is_empty() {
|
||
result.push(NAN3);
|
||
}
|
||
result.push([cx0, cy0, z]);
|
||
pen_down = true;
|
||
} else if let Some(&[lx, ly, _]) = result.last() {
|
||
if (lx - cx0).abs() > 1e-4 || (ly - cy0).abs() > 1e-4 {
|
||
result.push(NAN3);
|
||
result.push([cx0, cy0, z]);
|
||
}
|
||
}
|
||
result.push([cx1, cy1, z]);
|
||
// If the exit point was clipped, lift pen.
|
||
if (cx1 - x1).abs() > 1e-4 || (cy1 - y1).abs() > 1e-4 {
|
||
pen_down = false;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
// Remove trailing NaN.
|
||
while result
|
||
.last()
|
||
.map(|p: &[f32; 3]| p[0].is_nan())
|
||
.unwrap_or(false)
|
||
{
|
||
result.pop();
|
||
}
|
||
result
|
||
}
|