Patterns of components (rectangular, circular or path: new occurrences at each placement); path pattern orientation test

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/doc/src/eval.rs

@@ -1125,6 +1125,12 @@ fn mirror_matrix(pl: &Plane) -> Mat {
 
 const MAX_INSTANCES: usize = 1000;
 
+/// The placements (column-major matrices) of a pattern's copies, the original excluded.
+pub fn pattern_matrices(doc: &Document, st: &ModelState, p: &crate::PatternKind) -> Result<Vec<[[f64; 4]; 4]>> {
+    let (vals, _) = doc.param_values();
+    pattern_transforms(&vals, st, p)
+}
+
 fn pattern_transforms(vals: &BTreeMap<String, Value>, st: &ModelState, p: &crate::PatternKind) -> Result<Vec<Mat>> {
     let count = |e: &str| -> Result<usize> {
         let n = val(vals, e, Kind::Unitless)?.round();

crates/doc/src/lib.rs

@@ -16,7 +16,7 @@ mod project3d;
 
 pub use assembly::{IDENTITY, Mat, Occurrence, apply_point, apply_vector, is_identity, mat_inverse, mat_mul, rigid};
 pub use document::*;
-pub use eval::{FeatureResult, Model, ModelBody, ModelState, SolvedSketch, ThreadInfo, parse_metric_thread, world_state};
+pub use eval::{FeatureResult, Model, ModelBody, ModelState, SolvedSketch, ThreadInfo, parse_metric_thread, pattern_matrices, world_state};
 pub use params::{ParamRow, ParamUser, cycles};
 pub use solvecraft_kernel as kernel;
 pub use solvecraft_sketch as sketch;