Outline: encapsulate assembly data

app-proto/sketch-outline/src/assembly.rs

@@ -0,0 +1,16 @@
+use nalgebra::DVector;
+use sycamore::reactive::Signal;
+
+#[derive(Clone, PartialEq)]
+pub struct Element {
+    pub id: String,
+    pub label: String,
+    pub color: [f32; 3],
+    pub rep: DVector<f64>,
+}
+
+// a complete, view-independent description of an assembly
+pub struct Assembly {
+    // the order of the elements is arbitrary, and it could change at any time
+    pub elements: Signal<Vec<Element>>
+}