refactor: drawCultures

src/layers/renderers/utilts.ts

@@ -0,0 +1,40 @@
+import {connectVertices} from "scripts/connectVertices";
+
+export function getPaths(
+  cellNeighbors: number[][],
+  cellVertices: number[][],
+  vertices: IGraphVertices,
+  getType: (cellId: number) => number
+) {
+  const paths: Dict<string> = {};
+
+  function addPath(index: number, points: TPoints) {
+    if (!paths[index]) paths[index] = "";
+    paths[index] += "M" + points.join("L") + "Z";
+  }
+
+  const checkedCells = new Uint8Array(cellNeighbors.length);
+  for (let cellId = 0; cellId < cellNeighbors.length; cellId++) {
+    if (checkedCells[cellId]) continue;
+    if (!getType(cellId)) continue;
+    checkedCells[cellId] = 1;
+
+    const type = getType(cellId);
+    const ofSameType = (cellId: number) => getType(cellId) === type;
+
+    const isOnborder = cellNeighbors[cellId].some(cellId => !ofSameType(cellId));
+    if (!isOnborder) continue;
+
+    const startingVertex = cellVertices[cellId].find(v => vertices.c[v].some(cellId => !ofSameType(cellId)));
+    if (startingVertex === undefined) throw new Error(`getPath: starting vertex for cell ${cellId} is not found`);
+
+    const chain = connectVertices({vertices, startingVertex, ofSameType, checkedCellsMutable: checkedCells});
+
+    if (chain.length < 3) continue;
+    const points = chain.map(v => vertices.p[v]);
+
+    addPath(type, points);
+  }
+
+  return paths;
+}